Organic Solvent Recovery System

Abstract

To provide an organic solvent recovery system which may recover an organic solvent from exhaust gas in a more efficient manner.SOLUTION: An organic solvent recovery system includes: a cooling condensation apparatus 100; a first flow path F1 in which a cooling process gas G4 flows; a concentrator 400; a second flow path F2 in which a cooling process gas G5 flows; and a second concentrator 300. The concentrator 400 includes a hollow cylindrical rotor 90 in which adsorbents 30 are disposed in a cylindrical form having a cylinder hole 90a and which may rotate around a cylinder axis C. The cylinder axis C of the cylindrical rotor 90 extends in a horizontal direction.SELECTED DRAWING: Figure 11

Description

[Technical Field]

[0001] The present disclosure relates to an organic solvent recovery system. [Background technology]

[0002] Conventionally, a known treatment system for recovering organic solvents from exhaust gases containing organic solvents is one that combines a cooling condenser and a concentrator using an adsorption element. The cooling condenser condenses and recovers the organic solvents, reducing the organic solvent concentration in the exhaust gas. The concentrator using an adsorption element brings the exhaust gas, which has a reduced organic solvent concentration and is discharged from the cooling condenser, into contact with the adsorption element to adsorb the organic solvent, further reducing the organic solvent concentration in the exhaust gas, and also sprays high-temperature gas onto the adsorbent material that has adsorbed the organic solvent, desorbing the organic solvent and discharging it as a desorbed gas containing a high concentration of organic solvent. The desorbed gas is returned to the cooling condenser and reprocessed (see Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-101553 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-991 Summary of the Invention [Problem to be solved by the invention]

[0004] In production facilities, a certain amount of clean gas is replenished. Therefore, exhaust gas equivalent to the replenished gas is emitted into the external environment. In recent years, global exhaust gas regulations have required the removal of organic solvents to extremely low concentrations, which requires high treatment efficiency.

[0005] An object of the present disclosure is to provide an organic solvent recovery system that can recover organic solvents from exhaust gases with higher efficiency. [Means for solving the problem]

[0006] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the cooled treatment gas in which the concentration of the organic solvent in the exhaust gas has been reduced; a cooling gas flow path through which the cooled treatment gas flows; a concentrating device that adsorbs the organic solvent contained in the cooled treatment gas introduced from the cooling gas flow path using an adsorption element, discharges the treated gas in which the concentration of the organic solvent has been further reduced, introduces high-temperature gas to desorb the organic solvent from the adsorption element, and discharges the treated gas as a desorbed gas; and a desorption gas flow path through which the desorbed gas is introduced into the cooling and condensing device.

[0007] The cooling condensation device includes a cooling section through which the exhaust gas flows, and a separation section located downstream of the cooling section when viewed along the flow direction of the exhaust gas. The separation section has a receiving section that receives the cooling condensate containing the organic solvent cooled in the cooling section, a mesh structure that separates the cooled condensate from the cooled exhaust gas by contacting it with the cooled exhaust gas, and a chamber that stores the cooled treatment gas after passing through the mesh structure for a certain period of time. When viewed along the flow direction of the exhaust gas, the direction of flow from the cooling section to the separation section intersects with the direction of flow from the mesh structure to the chamber within the separation section, causing the exhaust gas to flow in an L-shaped direction.

[0008] In the organic solvent recovery system, a heater for heating the cooled treatment gas is disposed downstream of the mesh structure.

[0009] In the organic solvent recovery system, a weir is provided in the chamber to prevent the cooling condensate from flowing into the cooling gas flow path.

[0010] In the organic solvent recovery system, the concentrator includes a first concentrator and a second concentrator located downstream of the first concentrator. The first concentrator adsorbs the organic solvent contained in the cooled process gas introduced from the cooled gas flow path using a first adsorption element, thereby discharging the resulting first process gas in which the concentration of the organic solvent has been further reduced, and introduces a high-temperature gas to desorb the organic solvent from the first adsorption element and discharge the resulting first desorbed gas. The organic solvent recovery system further includes a first process gas flow path through which a portion of the first process gas flows. The second concentrator adsorbs the organic solvent contained in the first process gas introduced from the first process gas flow path using a second adsorption element, thereby discharging the resulting second process gas in which the concentration of the organic solvent has been further reduced, and introduces a high-temperature gas to desorb the organic solvent from the second adsorption element and discharge the resulting second desorbed gas.

[0011] In the organic solvent recovery system, a plurality of the first concentrators are arranged in the circumferential direction around the cylindrical axis of a hollow cylindrical rotor in which the first adsorption element rotates around the cylindrical axis.

[0012] In the organic solvent recovery system, the second concentrator is arranged on a disk-shaped adsorption rotor in which the second adsorption element rotates around a cylindrical axis.

[0013] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the cooled treated gas having a reduced concentration of the organic solvent; a cooling gas flow path through which the cooled treated gas flows; a first adsorption element that adsorbs the organic solvent contained in the cooled treated gas introduced from the cooling gas flow path and discharges the cooled treated gas as a first treated gas having a further reduced concentration of the organic solvent; The system includes a first concentrator that desorbs the organic solvent from the first adsorption element and discharges it as a first desorbed gas; a first treated gas flow path through which a portion of the first treated gas flows; and a second concentrator that adsorbs the organic solvent contained in the first treated gas introduced from the first treated gas flow path in a second adsorption element and discharges it as a second treated gas in which the concentration of the organic solvent is further reduced, and introduces high-temperature gas to desorb the organic solvent from the second adsorption element and discharges it as a second desorbed gas, wherein the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the cooling gas flow path.

[0014] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the cooled treated gas having a reduced concentration of the organic solvent; a cooling gas flow path through which the cooled treated gas flows; a first adsorption element that adsorbs the organic solvent contained in the cooled treated gas introduced from the cooling gas flow path and discharges the cooled treated gas as a first treated gas having a further reduced concentration of the organic solvent; a first concentrator that desorbs the organic solvent from the first adsorption element and discharges it as a first desorbed gas; a first treated gas flow path through which a portion of the first treated gas flows; and a second concentrator that adsorbs the organic solvent contained in the first treated gas introduced from the first treated gas flow path in a second adsorption element and discharges it as a second treated gas in which the concentration of the organic solvent is further reduced, and introduces high-temperature gas by a second heater to desorb the organic solvent from the second adsorption element and discharge it as a second desorbed gas, wherein the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the first heater.

[0015] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the organic solvent as a cooled treatment gas having a reduced concentration; a cooling gas flow path through which the cooled treatment gas flows; and a first adsorption element that adsorbs the organic solvent contained in the cooled treatment gas introduced from the cooling gas flow path in a first adsorption element, and discharges the adsorbed organic solvent as a first treatment gas having a further reduced organic solvent concentration, and introduces a high-temperature gas to desorb the organic solvent from the first adsorption element and discharge the first desorbed gas. the first process gas flow path through which a portion of the first process gas flows; a cooling and condensing device return path through which the remainder of the first process gas other than the portion of the first process gas discharged from the first process gas flow path is returned to the cooling and condensing device; and a second concentrating device that adsorbs the organic solvent contained in the first process gas introduced from the first process gas flow path in a second adsorption element, discharges the second process gas having a further reduced organic solvent concentration, and introduces high-temperature gas to desorb the organic solvent from the second adsorption element, and discharges the second desorbed gas, wherein the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the cooling and condensing device return path.

[0016] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the organic solvent as a cooled treated gas having a reduced concentration; a cooling gas flow path through which the cooled treated gas flows; a first concentrating device that adsorbs the organic solvent contained in the cooled treated gas introduced from the cooling gas flow path in a first adsorption element and discharges the adsorbed organic solvent as a first treated gas having a further reduced organic solvent concentration, and introduces a high-temperature gas to desorb the organic solvent from the first adsorption element and discharge the first desorbed gas; and a second concentrator that adsorbs the organic solvent contained in the first process gas introduced from the first process gas flow path in a second adsorption element, thereby discharging the second process gas having a further reduced organic solvent concentration, and introduces high-temperature gas to desorb the organic solvent from the second adsorption element, thereby discharging the second desorbed gas. The cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with a refrigerant, and the organic solvent recovery system further includes a production facility return path that returns a portion of the exhaust gas discharged from the production facility to the production facility after passing through the heat exchanger, and the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the production facility return path.

[0017] In the organic solvent recovery system, a plurality of the first concentrators are arranged in the circumferential direction around the cylindrical axis of a hollow cylindrical rotor in which the first adsorption element rotates around the cylindrical axis.

[0018] In the organic solvent recovery system, the second concentrator is arranged on a disk-shaped adsorption rotor in which the second adsorption element rotates around a cylindrical axis.

[0019] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharge the liquefied and condensed organic solvent as a cooled treated gas having a reduced concentration of the organic solvent; a cooling gas flow path through which a portion of the cooled treated gas flows; a first concentrating device that adsorbs the organic solvent contained in the cooled treated gas introduced from the cooling gas flow path in a first adsorption element, and discharges the adsorbed organic solvent as a first treated gas having a further reduced concentration of the organic solvent, and introduces a high-temperature gas to desorb the organic solvent from the first adsorption element and discharge the first desorbed gas; and a second concentrator that adsorbs the organic solvent contained in the first process gas introduced from the first process gas flow path in a second adsorption element, thereby discharging the second process gas having a further reduced organic solvent concentration, and introduces a high-temperature gas to desorb the organic solvent from the second adsorption element, thereby discharging the second desorbed gas. The cooling and condensing device includes a heat exchanger that cools the exhaust gas by heat exchange with a refrigerant, and the organic solvent recovery system further includes a heat exchanger return path that returns the remainder of the cooled process gas other than the part of the cooled process gas to the heat exchanger, and the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the cooling gas flow path.

[0020] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the organic solvent as a cooled treatment gas having a reduced concentration; a cooling gas flow path through which a portion of the cooled treatment gas flows; a first concentrating device that adsorbs the organic solvent contained in the cooled treatment gas introduced from the cooling gas flow path in a first adsorption element, and discharges the adsorbed organic solvent as a first treatment gas having a further reduced organic solvent concentration, and introduces high-temperature gas by a heater to desorb the organic solvent from the first adsorption element and discharges the first desorbed gas; the cooling and condensing device includes a heat exchanger that cools the exhaust gas by heat exchange with a refrigerant, and the organic solvent recovery system further includes a heat exchanger return path that returns the remainder of the cooled treatment gas, which is other than the portion of the cooled treatment gas, to the heat exchanger, and the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the heater.

[0021] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharge the organic solvent as a cooled treatment gas having a reduced concentration; a cooling gas flow path through which a portion of the cooled treatment gas flows; a first concentrating device that adsorbs the organic solvent contained in the cooled treatment gas introduced from the cooling gas flow path in a first adsorption element, and discharges the adsorbed organic solvent as a first treatment gas having a further reduced organic solvent concentration, and introduces a high-temperature gas to desorb the organic solvent from the first adsorption element and discharge the first desorbed gas; and a second concentrator that adsorbs the organic solvent contained in the first process gas introduced from the first process gas flow path in a second adsorption element, thereby discharging the second process gas having a further reduced organic solvent concentration, and introduces a high-temperature gas to desorb the organic solvent from the second adsorption element and discharge the second desorbed gas. The cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with a refrigerant, and the organic solvent recovery system further includes a heat exchanger return path that returns the remainder of the cooled process gas other than the part of the cooled process gas to the heat exchanger, and the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the heat exchanger return path.

[0022] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the organic solvent as a cooled treated gas having a reduced concentration; a cooling gas flow path through which a portion of the cooled treated gas flows; a first concentrating device that adsorbs the organic solvent contained in the cooled treated gas introduced from the cooling gas flow path in a first adsorption element, discharges the adsorbed organic solvent as a first treated gas having a further reduced organic solvent concentration, and introduces a high-temperature gas to desorb the organic solvent from the first adsorption element and discharges the first desorbed gas; a first treated gas flow path through which the first treated gas flows; and a second concentrator that adsorbs the organic solvent contained in the first treated gas introduced from the gas flow path in a second adsorption element, thereby discharging the second treated gas in which the concentration of the organic solvent is further reduced, and introduces a high-temperature gas to desorb the organic solvent from the second adsorption element, thereby discharging the second desorbed gas. The cooling and condensing device includes a heat exchanger that performs cooling by heat exchange with a refrigerant, and the organic solvent recovery system further comprises a heat exchanger return path that returns the remainder of the cooled treated gas other than the portion of the cooled treated gas to the heat exchanger, and a production equipment return path that returns a portion of the exhaust gas discharged from the production equipment to the production equipment after passing through the heat exchanger, and the first desorbed gas is returned to the cooling and condensing device, and the second desorbed gas is returned to the production equipment return path.

[0023] In the organic solvent recovery system, a plurality of the first concentrators are arranged in the circumferential direction around the cylindrical axis of a hollow cylindrical rotor in which the first adsorption element rotates around the cylindrical axis.

[0024] In the organic solvent recovery system, the second concentrator is arranged on a disk-shaped adsorption rotor in which the second adsorption element rotates around a cylindrical axis.

[0025] According to one aspect of the organic solvent recovery system of the present disclosure, there is provided an organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, the organic solvent recovery system including: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the cooled treated gas having a reduced concentration of the organic solvent; a cooling gas flow path through which the cooled treated gas flows; a first adsorption element that adsorbs the organic solvent contained in the cooled treated gas introduced from the cooling gas flow path, and discharges the cooled treated gas as a first treated gas having a further reduced concentration of the organic solvent; and a high-temperature gas introduction device that introduces a high-temperature gas into the cooled treated gas. a first concentrator configured to desorb the organic solvent from the first adsorption element by introducing a high-temperature gas into the first concentrator and discharge the desorbed organic solvent as a first desorbed gas, a first process gas flow path through which the first process gas flows, and a second concentrator configured to adsorb the organic solvent contained in the first process gas introduced from the first process gas flow path using a second adsorption element and discharge the adsorbed organic solvent as a second process gas having a further reduced organic solvent concentration, and to introduce a high-temperature gas to desorb the organic solvent from the second adsorption element and discharge the second desorbed gas, wherein the first concentrator includes a hollow cylindrical rotor that is rotatable about a cylindrical axis and has a cylindrical hole, and the cylindrical axis of the cylindrical rotor extends horizontally.

[0026] In the organic solvent recovery system, the cooling and condensing device further includes a mesh structure with which the cooled exhaust gas is brought into contact to separate the condensed organic solvent from the cooled treatment gas, and a chamber in which the cooled treatment gas is stored for a certain period of time after passing through the mesh structure.

[0027] In the organic solvent recovery system, the cooling and condensing device further includes a heat exchanger that performs the cooling by heat exchange with a refrigerant.

[0028] In the organic solvent recovery system, the second concentrator is arranged on a disk-shaped adsorption rotor in which the second adsorption element rotates around a cylindrical axis. [Effects of the Invention]

[0029] According to this disclosure, it is possible to provide an organic solvent recovery system that can recover organic solvents from exhaust gases with higher efficiency. [Brief explanation of the drawings]

[0030] [Figure 1] FIG. 1 is a diagram schematically illustrating the configuration of an organic solvent recovery system according to an embodiment 1B. [Figure 2] FIG. 10 is a diagram schematically illustrating the configuration of an organic solvent recovery system according to an embodiment 2B. [Figure 3] FIG. 10 is a diagram schematically illustrating the configuration of an organic solvent recovery system according to embodiment 1C. [Figure 4] FIG. 10 is a diagram schematically illustrating the configuration of an organic solvent recovery system according to an embodiment 2C. [Figure 5] FIG. 10 is a diagram schematically illustrating the configuration of an organic solvent recovery system according to embodiment 3C. [Figure 6] FIG. 10 is a diagram schematically illustrating the configuration of an organic solvent recovery system according to an embodiment 4C. [Figure 7] FIG. 1 is a diagram schematically showing the configuration of an organic solvent recovery system according to an embodiment 1D. [Figure 8] FIG. 10 is a diagram schematically showing the configuration of an organic solvent recovery system according to an embodiment 2D. [Figure 9] FIG. 10 is a diagram schematically showing the configuration of an organic solvent recovery system according to an embodiment 3D. [Figure 10] FIG. 10 is a diagram schematically showing the configuration of an organic solvent recovery system according to an embodiment 4D. [Figure 11] FIG. 2 is a longitudinal cross-sectional view of the concentrator. [Figure 12] FIG. 12 is a cross-sectional view taken along line XII-XII shown in FIG. [Figure 13] FIG. 12 is an enlarged cross-sectional view of a main part of the cylindrical rotor shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0031] The organic solvent recovery system according to each embodiment of the present disclosure will be described below with reference to the drawings. In the embodiments described below, when reference is made to the number, amount, etc., the scope of the present disclosure is not necessarily limited to that number, amount, etc., unless otherwise specified. The same reference numerals are used for the same or equivalent parts, and redundant descriptions may not be repeated. It is intended from the beginning that the configurations in the embodiments may be used in appropriate combinations.

[0032] [Embodiment 1B] 1 is a diagram schematically illustrating the configuration of an organic solvent recovery system 1B according to embodiment 1B. The organic solvent recovery system 1B includes a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various flow paths.

[0033] The cooling and condensing device 100 has a cooling section 110 and a separation section 120. Exhaust gas G1 containing an organic solvent is discharged from a production facility 130. The exhaust gas G1 is cooled by passing through the cooling section 110. As the exhaust gas G1 passes through the cooling section 110, the organic solvent is liquefied and condensed.

[0034] The exhaust gas G2 that has passed through the cooling section 110 is separated into a liquefied and condensed cooling liquid L1 and a cooled treated gas G3 with a reduced organic solvent concentration by passing through the separation section 120. The cooled treated gas G3 is discharged from the cooling condensation device 100 to the first concentrator 200 through the chamber 123 as a cooled treated gas G4.

[0035] There are no particular limitations on the cooling means and configuration of the cooling unit 110. In embodiment 1B, a first heat exchanger 111 is used that performs cooling by indirect heat exchange between a refrigerant such as cooling water, cold water, or brine and the exhaust gas. The first heat exchanger 111 is positioned so that the exhaust gas G1 flows through it in a vertical direction.

[0036] The cooling section 110 is provided with a second heat exchanger 112, which is provided before the first heat exchanger 111 and cools the exhaust gas G1 by heat exchange between the cooled treatment gas G6 (described later) and the exhaust gas G1. The second heat exchanger 112 can reduce the heat transfer area and amount of refrigerant required for the first heat exchanger 111. A portion of the exhaust gas G1 and the cooled treatment gas G6 is returned to the production facility 130 via a fifth flow path F5. The conditions, such as the cooling temperature in the first heat exchanger 111 and the second heat exchanger 112, may be determined appropriately depending on the organic solvent to be recovered.

[0037] The separation means and configuration of the separation unit 120 are not particularly limited. In embodiment 1B, a mesh structure 121, such as a demister, filter, or mesh, is used to capture droplets through contact. The separation unit 120 has a funnel-shaped receiver 122 that receives the cooling condensate L1 containing the organic solvent cooled in the cooling unit 110. The cooling condensate L1 cooled in the cooling unit 110 and the cooling condensate L1 captured in the mesh structure 121 flow by gravity to the receiver 122 and are then collected in a tank 125 arranged below the receiver 122 and recovered as recovered liquid L3.

[0038] The chamber 123 is a structure having a certain volume of space. A weir 124 is provided within the chamber 123. The weir 124 prevents a portion of the cooling condensate L1 from moving toward the tip of the chamber 123 and flowing into the first flow path F1, which serves as a cooling gas flow path. The weir 124 functions to reliably recover the cooling condensate L1. The cooling treatment gas G3 stored in the chamber 123 for a certain period of time flows through the first flow path F1 as the cooling treatment gas G4 and is supplied to the first concentrator 200.

[0039] In the organic solvent recovery system 1B, when viewed along the flow direction of the exhaust gas G1, the flow direction from the cooling section 110 to the separation section 120 intersects with the flow direction from the mesh structure 121 to the chamber 123 within the separation section 120, resulting in a structure in which the exhaust gas G1 (exhaust gas G2, cooled treatment gas G3) flows in an L-shaped direction.

[0040] In organic solvent recovery system 1B, the cooling section 110 and separation section 120 have an L-shaped structure, which prevents the first concentrator 200 and the second concentrator 300 from being exposed to droplets or splashes. If the first concentrator 200 and the second concentrator 300 are exposed and the adsorbent becomes wet, there is a possibility that the strength of the first concentrator 200 and the second concentrator 300 will decrease or the device will be damaged. By having an L-shaped structure, organic solvent recovery system 1B can prevent the strength of the first concentrator 200 and the second concentrator 300 from decreasing or the device will be damaged.

[0041] The first concentrator 200 has an adsorption rotor 212 containing an adsorbent that adsorbs organic solvents contained in the adsorbent upon contact with a gas and desorbs the adsorbed organic solvent upon contact with a heated gas. The adsorption rotor 212 is composed of a plurality of adsorption units 210 separated by a plurality of partitions. The adsorption rotor 212 has a hollow cylindrical shape as a whole due to the plurality of adsorption units 210. The adsorption rotor 212 is installed in a processing chamber and is provided so as to allow fluid to flow in the radial direction. The adsorption rotor 212 is provided so as to be rotatable about a cylindrical axis by receiving the rotational driving force of a motor.

[0042] In the first concentration device 200, a part of the adsorption unit 210 constitutes an adsorption section that adsorbs the organic solvent contained in the cooling treatment gas G4 supplied from the outside to the inside of the adsorption unit 210, and the remaining part of the adsorption unit 210 constitutes a desorption section that desorbs the organic solvent adsorbed in the adsorption unit 210 from the adsorption unit 210 by supplying heated air from the inside to the outside of the adsorption unit 210.

[0043] During the purification, the cooling process gas G4 supplied into the processing chamber is introduced into the adsorption section from the outer peripheral surface of the adsorption rotor 212. As the cooling process gas G4 introduced into the adsorption section passes through the adsorption rotor 212 in the radial direction from the outer peripheral surface to the inner peripheral surface, the organic solvent is adsorbed by the multiple adsorption units 210 located in the adsorption section, thereby being purified.

[0044] Cooled treatment gases G5 and G6, which are the purified fluids to be treated, are discharged as clean gases from the top of the adsorption unit 210. A portion of the discharged clean gases flows through the second flow path F2 as cooled treatment gas G5 and is supplied to the second concentrator 300. A portion of the discharged clean gas flows through the fourth flow path F4 as cooled treatment gas G6 and is returned to the second heat exchanger 112.

[0045] The inner circumference-side flow path forming member 211 and the outer circumference-side flow path forming member 213 are disposed facing each other on the inner circumference side and the outer circumference side of the adsorption rotor 212 so as to sandwich a part of the adsorption rotor 212 in the circumferential direction. The region of the adsorption rotor 212 sandwiched between the inner circumference-side flow path forming member 211 and the outer circumference-side flow path forming member 213 is the detachable portion.

[0046] To desorb the organic solvent, high-temperature gas G7, which is part of the cooled treatment gas G5 heated by the regeneration heater 250, is introduced from the inner periphery-side flow path forming member 211 into the desorption section. As the high-temperature gas G7 introduced into the desorption section passes through the adsorption rotor 212, it thermally desorbs the organic solvent adsorbed by the multiple adsorption units 210 located in the desorption section. Desorption gas G8 containing the organic solvent is discharged as a concentrated gas from the desorption section through the outer periphery-side flow path forming member 213, to the outside of the treatment chamber, and returned to the third flow path F3. A portion of the organic solvent contained in the desorption gas G8 is liquefied and condensed, and collected in the tank 125 as desorption condensate L2.

[0047] The third flow path F3 is a section that returns the desorption gas G8 and a desorption gas G11, which will be described later, to the introduction section of the exhaust gas G1 of the cooling condensation device 100. The third flow path F3 is preferably connected so that the desorption section is located above the confluence position of the desorption gas and the exhaust gas G1 supplied to the cooling condensation device 100. This is because the desorption gas G8 of the first concentrator 200 and the desorption condensate L2 generated from the desorption gas G11 of the second concentrator 300 are likely to migrate to the cooling condensation device 100. The third flow path F3 is preferably configured to be vented to two locations: the introduction section of the exhaust gas G1 of the cooling condensation device 100 and the tank 125. This is because the desorption gas G8 and the desorption condensate L2 generated from the desorption gas G11 are likely to be directly collected in the tank 125.

[0048] In the first concentrator 200, the adsorption unit 210 located in the adsorption section performs adsorption of the target substance, and after the adsorption, the adsorption unit 210 located in the desorption section performs desorption of the target substance. The adsorption rotor 212 rotates around the cylindrical axis, causing the adsorption unit 210 to move alternately between the desorption section and the adsorption section, and the adsorption and desorption of the target substance are continuously performed.

[0049] Activated alumina, silica gel, activated carbon material, zeolite, etc. can be used as the material of the adsorption element constituting the adsorption unit 210. The shape of the adsorption element in the adsorption unit 210 is not particularly limited, and may be, for example, a honeycomb-shaped sheet containing activated carbon material or zeolite, or a laminate of activated carbon fiber nonwoven fabric.

[0050] The second concentrator 300 has an adsorption element 310 including an adsorbent that adsorbs the organic solvent contained in the gas upon contact with the adsorbent and desorbs the adsorbed organic solvent upon contact with the heated gas. The adsorption element 310 includes a desorption section (desorption zone) 311 and an adsorption section (adsorption zone) 312. When the cooled treatment gas G5 is introduced into the adsorption section 312, the cooled treatment gas G5 comes into contact with the adsorbent, and the organic solvent contained in the cooled treatment gas G5 is adsorbed by the adsorbent. The cooled treatment gas G5 is purified and discharged as purified gas G9.

[0051] In the desorption section 311, high-temperature gas G10 having a temperature higher than that of the cooled treatment gas G5 is introduced into the adsorbent, whereby the organic solvent is desorbed from the adsorbent, and is discharged as a desorbed gas G11 containing the organic solvent.

[0052] Activated alumina, silica gel, activated carbon material, and zeolite are widely used as the adsorbent material contained in the adsorption element 310, and among them, activated carbon and hydrophobic zeolite are particularly preferably used.

[0053] 1, the second concentrator 300 includes a rotary shaft and an adsorption element 310 disposed around the rotary shaft. The second concentrator 300 is configured such that, by rotating the adsorption element 310 around the rotary shaft, the adsorbent that has adsorbed the organic solvent in the cooled treatment gas G5 introduced from the second flow path F2 in the adsorption section 312 is continuously moved to the desorption section 311.

[0054] As shown in Figure 1, in the second concentrator 300, it is preferable that the desorption section 311 be located lower than the adsorption section 312. This is because even if some of the organic solvent contained in the desorption gas G11 is liquefied and condensed to generate desorption condensate L2, the desorption condensate L2 is less likely to adhere to the adsorption section 312. The desorption condensate L2 falls below the desorption section 311 and is collected by running down the inner surface of the exterior of the desorption section. More preferably, the desorption section 311 should be sloped downward to make it easier for the desorption condensate L2 to fall downward.

[0055] The second concentrator 300 may have a cleaning section (purging section) to which the portion of the desorption section 311 where the desorption process has been completed is transferred before transferring to the adsorption section 312. A configuration may be adopted in which a portion of the cleaned gas G9 is introduced into the purge section, and the purge section outlet gas discharged from the purge section is introduced into the adsorption section 312. This is because cleaning the adsorbent where desorption has been completed with the cleaned gas G9 prevents the desorbed gas G11 remaining in the adsorbent from being mixed into the cleaned gas G9 and allows the adsorbent to be cooled.

[0056] The high-temperature gas G10 used for desorption is preferably a part of the clean gas G9 heated to a high temperature using a heating means such as a regenerative heater 350. This is because the processing volume of the organic solvent-containing gas in the adsorption section 312 does not increase.

[0057] [Embodiment 2B] 2 is a diagram schematically illustrating the configuration of an organic solvent recovery system 2B according to embodiment 2B. The organic solvent recovery system 2B includes a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various flow paths. The organic solvent recovery system 2B is the same as the organic solvent recovery system 1B according to embodiment 1B, except that a heater 126 is provided in a chamber 123.

[0058] The heater 126 slightly heats the cooled cooling process gas G3, which can prevent the organic solvent or water from condensing.

[0059] [Actions and Effects] The cooling condensation device 100 of this embodiment includes a cooling section 110 through which an exhaust gas G1 flows, and a separation section 120 located downstream of the cooling section 110 when viewed along the flow direction of the exhaust gas G1. The separation section 120 includes a receiving section 122 that receives a cooling condensate L1 containing an organic solvent cooled in the cooling section 110, a mesh structure 121 that separates the cooling condensate L1 from a cooling treatment gas G3 by bringing the mesh structure 121 into contact with the cooled exhaust gas G2, and a chamber 123 that stores the cooling treatment gas G3 after passing through the mesh structure 121 for a certain period of time.

[0060] When viewed along the flow direction of the exhaust gas G1, the direction of flow from the cooling section 110 to the separation section 120 is crossed by the direction of flow from the mesh structure 121 to the chamber 123 within the separation section 120, causing the exhaust gas to flow in an L-shaped direction. This allows for more efficient recovery of cooled condensate L1 containing organic solvents from the exhaust gas G1. In the organic solvent recovery system of this embodiment, the portion consisting of the cooling section 110 and the separation section 120 has an L-shaped structure, which makes it possible to prevent the first concentrator 200 and the second concentrator 300, which are provided downstream, from being exposed to droplets and splashes.

[0061] In this embodiment, a heater 126 for heating the cooling treatment gas G3 is disposed downstream of the network structure 121. This prevents the organic solvent or moisture from condensing due to slight heating of the cooling treatment gas G3.

[0062] In this embodiment, a weir 124 is provided in the chamber 123. This prevents the cooling condensate liquid L1 from flowing into the first flow path F1, which serves as a cooling gas flow path.

[0063] The concentrating apparatus in this embodiment includes a first concentrating apparatus 200 and a second concentrating apparatus 300 located downstream of the first concentrating apparatus. The first concentrating apparatus 200 adsorbs the organic solvent contained in the cooled treated gas G4 introduced from the first flow path F1 in an adsorption unit 210 and discharges the cooled treated gas G5 with a further reduced organic solvent concentration, and introduces a high-temperature gas G7 to desorb the organic solvent from the adsorption unit 210 and discharges the desorbed gas G8.

[0064] The organic solvent recovery system in this embodiment further includes a second flow path F2 through which a portion of the cooled treatment gas G5 flows, and the second concentration device 300 adsorbs the organic solvent contained in the cooled treatment gas G5 introduced from the second flow path F2 using an adsorption element 310, discharging it as a clean gas G9 with a further reduced organic solvent concentration, and introduces high-temperature gas G10 to desorb the organic solvent from the adsorption element 310 and discharging it as a desorbed gas G11.

[0065] In this embodiment, a plurality of first concentrators 200 are arranged in the circumferential direction around the cylindrical axis of a hollow cylindrical rotor in which adsorption units 210 rotate around the cylindrical axis, thereby enabling highly efficient recovery of organic solvents.

[0066] In the second concentrator 300 of this embodiment, the adsorption element 310 is disposed on a disk-shaped adsorption rotor that rotates around a cylindrical axis, thereby enabling highly efficient recovery of the organic solvent.

[0067] [Other embodiments] In the above embodiment, two concentrators are used: a first concentrator 200 and a second concentrator 300. Depending on the air volume, two first concentrators 200 or two second concentrators 300 may be used. Also, depending on the removal efficiency, three or more concentrators may be used.

[0068] Examples of organic solvents contained in the exhaust gas G1 include organic solvents that can be liquefied and recovered by cooling to 1°C to 50°C. Examples of organic solvents include N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, and n-decane. These are examples, and the present invention is not limited to these. The organic solvent contained may be one type or multiple types.

[0069] [Embodiment 1C] 3 is a diagram schematically illustrating the configuration of an organic solvent recovery system 1C according to embodiment 1C. The organic solvent recovery system 1C includes a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various flow paths.

[0070] The cooling and condensing device 100 has a cooling section 110 and a separation section 120. Exhaust gas G1 containing an organic solvent is discharged from a production facility 130. The exhaust gas G1 is cooled by passing through the cooling section 110. As the exhaust gas G1 passes through the cooling section 110, the organic solvent is liquefied and condensed.

[0071] The exhaust gas G2 that has passed through the cooling section 110 is separated into a liquefied and condensed cooling liquid L1 and a cooled treated gas G3 with a reduced organic solvent concentration by passing through the separation section 120. The cooled treated gas G3 is discharged from the cooling condensation device 100 to the first concentrator 200 through the chamber 123 as a cooled treated gas G4.

[0072] The cooling means and configuration of the cooling unit 110 are not particularly limited. C In this system, a first heat exchanger 111 is used that performs cooling by indirect heat exchange between a refrigerant such as cooling water, cold water, or brine and the exhaust gas. The first heat exchanger 111 is positioned so that the exhaust gas G1 flows through it horizontally.

[0073] The cooling section 110 is provided with a second heat exchanger 112, which is provided before the first heat exchanger 111 and cools the exhaust gas G1 by heat exchange between the cooled treatment gas G6 (described later) and the exhaust gas G1. The second heat exchanger 112 can reduce the heat transfer area and amount of refrigerant required for the first heat exchanger 111. A portion of the exhaust gas G1 and the cooled treatment gas G6 is returned to the production facility 130 via a fifth flow path F5. The conditions, such as the cooling temperature in the first heat exchanger 111 and the second heat exchanger 112, may be determined appropriately depending on the organic solvent to be recovered.

[0074] The separation means and configuration of the separation unit 120 are not particularly limited. In embodiment 1C, a mesh structure 121 is used, such as a demister, filter, or mesh, which contacts and captures droplets. The cooled condensate liquid L1 captured in the mesh structure 121 is collected by gravity into a tank 125 arranged below the mesh structure 121 and recovered as recovered liquid L3.

[0075] The chamber 123 is a structure having a certain volume of space. The cooled treatment gas G3 stored in the chamber 123 for a certain period of time flows through the first flow path F1 as the cooled treatment gas G4 and is supplied to the first concentrator 200. The chamber 123 has a partition 128 that allows suction through the first flow path F1 in a direction opposite to the exhaust direction of the cooled treatment gas G3 discharged from the mesh structure 121.

[0076] The first flow path F1 is a section through which the cooled treatment gas G4 is introduced from the chamber 123 to the first concentrator 200. The connection port of the first flow path F1 to the chamber 123 is preferably the ceiling 127 of the chamber 123. This prevents the small amount of droplets that were not captured by the separation section 120 from entering the first concentrator 200, thereby preventing performance and strength degradation due to wetting of the adsorption unit 210 of the first concentrator 200, as described below. More preferably, the cooled treatment gas G4 is extracted opposite the flow direction of the cooled treatment gas G3. This further prevents droplets from entering. Alternatively, a droplet intrusion prevention member similar to the mesh structure 121 described above may be provided at the outlet for the cooled treatment gas G4, or a heater for vaporizing droplets may be provided.

[0077] The first concentrator 200 has an adsorption rotor 212 containing an adsorbent that adsorbs organic solvents contained in the adsorbent upon contact with a gas and desorbs the adsorbed organic solvent upon contact with a heated gas. The adsorption rotor 212 is composed of a plurality of adsorption units 210 separated by a plurality of partitions. The adsorption rotor 212 has a hollow cylindrical shape as a whole due to the plurality of adsorption units 210. The adsorption rotor 212 is installed in a processing chamber and is provided so as to allow fluid to flow in the radial direction. The adsorption rotor 212 is provided so as to be rotatable about a cylindrical axis by receiving the rotational driving force of a motor.

[0078] In the first concentration device 200, a part of the adsorption unit 210 constitutes an adsorption section that adsorbs the organic solvent contained in the cooling treatment gas G4 supplied from the outside to the inside of the adsorption unit 210, and the remaining part of the adsorption unit 210 constitutes a desorption section that desorbs the organic solvent adsorbed in the adsorption unit 210 from the adsorption unit 210 by supplying heated air from the inside to the outside of the adsorption unit 210.

[0079] During the purification, the cooling process gas G4 supplied into the processing chamber is introduced into the adsorption section from the outer peripheral surface of the adsorption rotor 212. As the cooling process gas G4 introduced into the adsorption section passes through the adsorption rotor 212 in the radial direction from the outer peripheral surface to the inner peripheral surface, the organic solvent is adsorbed by the multiple adsorption units 210 located in the adsorption section, thereby being purified.

[0080] Cooled treatment gases G5 and G6, which are the purified fluids to be treated, are discharged as clean gases from the top of the adsorption unit 210. A portion of the discharged clean gases flows through the second flow path F2 as cooled treatment gas G5 and is supplied to the second concentrator 300. A portion of the discharged clean gas flows through the fourth flow path F4 as cooled treatment gas G6 and is returned to the second heat exchanger 112.

[0081] The inner circumference-side flow path forming member 211 and the outer circumference-side flow path forming member 213 are disposed facing each other on the inner circumference side and the outer circumference side of the adsorption rotor 212 so as to sandwich a part of the adsorption rotor 212 in the circumferential direction. The region of the adsorption rotor 212 sandwiched between the inner circumference-side flow path forming member 211 and the outer circumference-side flow path forming member 213 is the detachable portion.

[0082] To desorb the organic solvent, high-temperature gas G7, which is part of the cooled treatment gas G5 heated by the regeneration heater 250, is introduced from the inner periphery-side flow path forming member 211 into the desorption section. As the high-temperature gas G7 introduced into the desorption section passes through the adsorption rotor 212, it thermally desorbs the organic solvent adsorbed by the multiple adsorption units 210 located in the desorption section. Desorption gas G8 containing the organic solvent is discharged as a concentrated gas from the desorption section through the outer periphery-side flow path forming member 213, to the outside of the treatment chamber, and returned to the third flow path F3. A portion of the organic solvent contained in the desorption gas G8 is liquefied and condensed, and collected in the tank 125 as desorption condensate L2.

[0083] The third flow path F3 is a section that returns the desorbed gas G8 to the inlet of the exhaust gas G1 of the cooling condensation device 100. The third flow path F3 is preferably connected so that the desorption section is located above the confluence of the desorbed gas G8 and the exhaust gas G1 supplied to the cooling condensation device 100. This arrangement makes it easier for the desorbed condensate L2 generated from the desorbed gas G8 in the first concentrator 200 to migrate to the cooling condensation device 100. The third flow path F3 is preferably configured to be vented to two locations: the inlet of the exhaust gas G1 of the cooling condensation device 100 and the tank 125. This configuration makes it easier for the desorbed condensate L2 generated from the desorbed gas G8 to be directly collected in the tank 125.

[0084] In the first concentrator 200, the adsorption unit 210 located in the adsorption section performs adsorption of the target substance, and after the adsorption, the adsorption unit 210 located in the desorption section performs desorption of the target substance. The adsorption rotor 212 rotates around the cylindrical axis, causing the adsorption unit 210 to move alternately between the desorption section and the adsorption section, and the adsorption and desorption of the target substance are continuously performed.

[0085] Activated alumina, silica gel, activated carbon material, zeolite, etc. can be used as the material of the adsorption element constituting the adsorption unit 210. The shape of the adsorption element in the adsorption unit 210 is not particularly limited, and may be, for example, a honeycomb-shaped sheet containing activated carbon material or zeolite, or a laminate of activated carbon fiber nonwoven fabric.

[0086] The second concentrator 300 has an adsorption element 310 including an adsorbent that adsorbs the organic solvent contained in the gas upon contact with the adsorbent and desorbs the adsorbed organic solvent upon contact with the heated gas. The adsorption element 310 includes a desorption section (desorption zone) 311 and an adsorption section (adsorption zone) 312. When the cooled treatment gas G5 is introduced into the adsorption section 312, the cooled treatment gas G5 comes into contact with the adsorbent, and the organic solvent contained in the cooled treatment gas G5 is adsorbed by the adsorbent. The cooled treatment gas G5 is purified and discharged as purified gas G9.

[0087] In the desorption section 311, a high-temperature gas G10 having a temperature higher than that of the cooled treatment gas G5 is introduced into the adsorbent, whereby the organic solvent is desorbed from the adsorbent, and the desorbed gas G11 containing the organic solvent is discharged. The desorbed gas G11 is returned to the first flow path F1 via the sixth flow path F6.

[0088] In the organic solvent recovery system 1C, the desorbed gas G11 is returned to the first flow path F1, so there is no need to treat the amount of desorbed gas G11 in the cooling and condensing device 100. Therefore, the organic solvent recovery system 1C can contribute to the miniaturization and energy saving of the cooling and condensing device 100. In the organic solvent recovery system 1C, the desorbed gas G11 is at a high temperature, so condensation of NMP (N-methyl-2-pyrrolidone), moisture, etc. contained in the cooled treatment gas G4 can be suppressed.

[0089] Activated alumina, silica gel, activated carbon material, and zeolite are widely used as the adsorbent material contained in the adsorption element 310, and among them, activated carbon and hydrophobic zeolite are particularly preferably used.

[0090] 3, the second concentrator 300 includes a rotating shaft and an adsorption element 310 disposed around the rotating shaft. The second concentrator 300 is configured such that, by rotating the adsorption element 310 around the rotating shaft, the adsorbent that has adsorbed the organic solvent in the cooled treatment gas G5 introduced from the second flow path F2 in the adsorption section 312 is continuously moved to the desorption section 311.

[0091] The second concentrator 300 may have a cleaning section (purging section) to which the portion of the desorption section 311 where the desorption process has been completed is transferred before transferring to the adsorption section 312. A configuration may be adopted in which a portion of the cleaned gas G9 is introduced into the purge section, and the purge section outlet gas discharged from the purge section is introduced into the adsorption section 312. This is because cleaning the adsorbent where desorption has been completed with the cleaned gas G9 prevents the desorbed gas G11 remaining in the adsorbent from being mixed into the cleaned gas G9 and allows the adsorbent to be cooled.

[0092] The high-temperature gas G10 used for desorption is preferably a part of the clean gas G9 heated to a high temperature using a heating means such as a regenerative heater 350. By heating to a high temperature, an increase in the processing flow rate of the organic solvent-containing gas in the adsorption section 312 can be suppressed.

[0093] [Embodiment 2C] 4 is a diagram schematically illustrating the configuration of an organic solvent recovery system 2C according to embodiment 2C. The organic solvent recovery system 2C includes a cooling and condensing device 100, a first concentrator 200, a second concentrator 300, and various flow paths. The organic solvent recovery system 2C has the same configuration as the organic solvent recovery system 1C according to embodiment 1C, except that the desorbed gas G11 from the second concentrator 300 is returned to the regeneration heater 250 via a sixth flow path F6.

[0094] In the organic solvent recovery system 2C, the desorbed gas G11 is returned to the regeneration heater 250, so there is no need to process the amount of desorbed gas G11 in the cooling condensation device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 2C can contribute to the miniaturization and energy saving of the cooling condensation device 100 and the first concentrating device 200. In the organic solvent recovery system 2C, the desorbed gas G11 is at a high temperature, so it can contribute to the energy saving of the regeneration heater 250.

[0095] [Embodiment 3C] 5 is a diagram illustrating the schematic configuration of an organic solvent recovery system 3C according to embodiment 3C. The organic solvent recovery system 3C includes a cooling and condensing device 100, a first concentrator 200, a second concentrator 300, and various flow paths. In the organic solvent recovery system 3C, the desorbed gas G11 from the second concentrator 300 is returned to the fourth flow path F4 via the sixth flow path F6. The organic solvent recovery system 3C has the same configuration as the organic solvent recovery system 1C according to embodiment 1C, except that the desorbed gas G11 from the second concentrator 300 is returned to the fourth flow path F4 via the sixth flow path F6.

[0096] The desorbed gas G11 that has passed through the sixth flow path F6 is one Concentrator 2 The desorbed gas G11 flows through the fourth flow path F4 together with the cooled treatment gas G6 discharged from the exhaust gas exchanger 110 and is returned to the second heat exchanger 112. The organic solvent recovery system 3C does not need to treat the amount of air flowing from the desorbed gas G11 in the cooling condensation device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 3C can contribute to the miniaturization and energy saving of the cooling condensation device 100 and the first concentrating device 200. Because the desorbed gas G11 has a high temperature, the organic solvent recovery system 3C can increase the temperature of the fluid flowing through the second heat exchanger 112, thereby contributing to the miniaturization and energy saving of the second heat exchanger 112 for cooling the exhaust gas G1.

[0097] [Embodiment 4C] 6 is a diagram illustrating the schematic configuration of an organic solvent recovery system 4C according to embodiment 4C. The organic solvent recovery system 4C includes a cooling and condensing device 100, a first concentrator 200, a second concentrator 300, and various flow paths. In the organic solvent recovery system 4C, the desorbed gas G11 from the second concentrator 300 is returned to the fifth flow path F5 via the sixth flow path F6. The organic solvent recovery system 4C has the same configuration as the organic solvent recovery system 1C according to embodiment 1C, except that the desorbed gas G11 from the second concentrator 300 is returned to the fifth flow path F5 via the sixth flow path F6.

[0098] The desorbed gas G11 that has flowed through the sixth flow path F6, together with the exhaust gas G1 discharged from the second heat exchanger 112 and a portion of the cooled treatment gas G6, flows through the fifth flow path F5 and is returned to the production facility 130. The organic solvent recovery system 4C eliminates the need to treat the amount of desorbed gas G11 in the cooling condensation device 100 and the first concentrating device 200. This allows the organic solvent recovery system 4C to contribute to the miniaturization and energy conservation of the cooling condensation device 100 and the first concentrating device 200. Because the desorbed gas G11 has a high temperature, the organic solvent recovery system 4C can increase the temperature of the exhaust gas G1 that is re-discharged from the production facility 130. This allows the organic solvent recovery system 4C to increase the temperature of the fluid flowing through the second heat exchanger 112, thereby contributing to the miniaturization and energy conservation of the second heat exchanger 112 that cools the exhaust gas G1.

[0099] [Actions and Effects] The organic solvent recovery system 1C in this embodiment includes a cooling and condensing device 100 that cools an exhaust gas G1 containing an organic solvent to liquefy and condense the organic solvent and discharge it as a cooled treated gas G4 with a reduced organic solvent concentration; a first flow path F1 through which the cooled treated gas G4 flows; a first concentrating device 200 that adsorbs the organic solvent contained in the cooled treated gas G4 introduced from the first flow path F1 using an adsorption unit 210 to discharge it as a cooled treated gas G5 with a further reduced organic solvent concentration, and introduces high-temperature gas G7 to desorb the organic solvent from the adsorption unit 210 and discharge it as a desorbed gas G8; a second flow path F2 through which a portion of the cooled treated gas G5 flows; and a second concentrating device 300 that adsorbs the organic solvent contained in the cooled treated gas G5 introduced from the second flow path F2 using an adsorption element 310 to discharge it as a clean gas G9 with a further reduced organic solvent concentration, and introduces high-temperature gas G10 to desorb the organic solvent from the adsorption element 310 and discharge it as a desorbed gas G11.

[0100] The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the first flow path F1. Because the organic solvent recovery system 1C returns the desorbed gas G11 to the first flow path F1, it is not necessary to treat the air volume of the desorbed gas G11 in the cooling and condensing device 100. Therefore, the organic solvent recovery system 1C can contribute to the miniaturization and energy conservation of the cooling and condensing device 100. Because the desorbed gas G11 is at a high temperature, the organic solvent recovery system 1C can suppress condensation of NMP (N-methyl-2-pyrrolidone), moisture, etc. contained in the cooled treatment gas G4.

[0101] The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the regeneration heater 250. Because the organic solvent recovery system 2C returns the desorbed gas G11 to the regeneration heater 250, it is not necessary to process the air volume of the desorbed gas G11 in the cooling and condensing device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 2C can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentrating device 200. The organic solvent recovery system 2C can contribute to energy saving of the regeneration heater 250 because the desorbed gas G11 is at a high temperature.

[0102] The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the fourth flow path F4. The desorbed gas G11, together with the cooled treatment gas G6, flows through the fourth flow path F4 and is returned to the second heat exchanger 112. The organic solvent recovery system 3C does not need to treat the amount of desorbed gas G11 in the cooling and condensing device 100 and the first concentrating device 200. This makes it possible to reduce the size and energy consumption of the cooling and condensing device 100 and the first concentrating device 200. Because the desorbed gas G11 has a high temperature, the organic solvent recovery system 3C can increase the temperature of the fluid flowing through the second heat exchanger 112, thereby contributing to reduce the size and energy consumption of the second heat exchanger 112 used to cool the exhaust gas G1.

[0103] The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the fifth flow path F5. The desorbed gas G11, together with the flue gas G1 discharged from the second heat exchanger 112 and a portion of the cooled treatment gas G6, flows through the fifth flow path F5 and is returned to the production facility 130. The organic solvent recovery system 4C eliminates the need to treat the amount of desorbed gas G11 in the cooling and condensing device 100 and the first concentrating device 200. This contributes to the miniaturization and energy conservation of the cooling and condensing device 100 and the first concentrating device 200. Because the desorbed gas G11 has a high temperature, the organic solvent recovery system 4C can increase the temperature of the flue gas G1 that is re-discharged from the production facility 130. This contributes to the miniaturization and energy conservation of the second heat exchanger 112 that cools the flue gas G1.

[0104] In this embodiment, a plurality of first concentrators 200 are arranged in the circumferential direction around the cylindrical axis of a hollow cylindrical rotor in which adsorption units 210 rotate around the cylindrical axis, thereby enabling highly efficient recovery of organic solvents.

[0105] In the second concentrator 300 of this embodiment, the adsorption element 310 is disposed on a disk-shaped adsorption rotor that rotates around a cylindrical axis, thereby enabling highly efficient recovery of the organic solvent.

[0106] [Other embodiments] In the above embodiment, two concentrators are used: a first concentrator 200 and a second concentrator 300. Depending on the air volume, two first concentrators 200 or two second concentrators 300 may be used. Also, depending on the removal efficiency, three or more concentrators may be used.

[0107] Examples of organic solvents contained in the exhaust gas G1 include organic solvents that can be liquefied and recovered by cooling to 1°C to 50°C. Examples of organic solvents include N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, and n-decane. These are examples, and the present invention is not limited to these. The organic solvent contained may be one type or multiple types.

[0108] [Embodiment 1D] 7 is a diagram schematically illustrating the configuration of an organic solvent recovery system 1D according to an embodiment 1D. The organic solvent recovery system 1D includes a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various flow paths.

[0109] The cooling and condensing device 100 has a cooling section 110 and a separation section 120. Exhaust gas G1 containing an organic solvent is discharged from a production facility 130. The exhaust gas G1 is cooled by passing through the cooling section 110. As the exhaust gas G1 passes through the cooling section 110, the organic solvent is liquefied and condensed.

[0110] The exhaust gas G2 that has passed through the cooling section 110 is separated into a liquefied and condensed cooling condensate L1 and a cooled treated gas G3 with a reduced organic solvent concentration by passing through the separation section 120. A portion of the cooled treated gas G3 is discharged from the cooling condensation device 100 to the first concentrator 200 as a cooled treated gas G4 through the chamber 123, and the remainder is returned from the cooling condensation device 100 to the second heat exchanger 112 described below as a cooled treated gas G6.

[0111] There are no particular limitations on the cooling means and configuration of the cooling unit 110. In embodiment 1D, a first heat exchanger 111 is used that performs cooling by indirect heat exchange between a refrigerant such as cooling water, cold water, or brine and the exhaust gas. The first heat exchanger 111 is positioned so that the exhaust gas G1 flows through it horizontally.

[0112] The cooling section 110 is provided with a second heat exchanger 112, which is provided before the first heat exchanger 111, for cooling the exhaust gas G1 by heat exchange between the cooled treatment gas G6 and the exhaust gas G1. The second heat exchanger 112 can reduce the heat transfer area and amount of refrigerant required for the first heat exchanger 111. A portion of the exhaust gas G1 and the cooled treatment gas G6 is returned to the production facility 130 via a fifth flow path F5. The conditions, such as the cooling temperature, in the first heat exchanger 111 and the second heat exchanger 112 may be determined appropriately depending on the organic solvent to be recovered.

[0113] The separation means and configuration of the separation unit 120 are not particularly limited. In embodiment 1D, a mesh structure 121 is used, such as a demister, filter, or mesh, which contacts and captures droplets. The cooled condensate liquid L1 captured in the mesh structure 121 is collected by gravity into a tank 125 arranged below the mesh structure 121 and recovered as recovered liquid L3.

[0114] The chamber 123 is a structure having a certain volume of space. A portion of the cooled treatment gas G3 stored in the chamber 123 for a certain period of time flows through the first flow path F1 as cooled treatment gas G4 and is supplied to the first concentrator 200. The remainder of the cooled treatment gas G3 flows through the fourth flow path F4 as cooled treatment gas G6 and is returned to the second heat exchanger 112. The chamber 123 has a partition 128 that allows suction through the first flow path F1 in a direction opposite to the exhaust direction of the cooled treatment gas G3 discharged from the mesh structure 121.

[0115] The first flow path F1 is a section through which the cooled treatment gas G4 is introduced from the chamber 123 to the first concentrator 200. The connection port of the first flow path F1 to the chamber 123 is preferably the ceiling 127 of the chamber 123. This prevents the small amount of droplets that were not captured by the separation section 120 from entering the first concentrator 200, thereby preventing performance and strength degradation due to wetting of the adsorption unit 210 of the first concentrator 200, as described below. More preferably, the cooled treatment gas G4 is extracted opposite the flow direction of the cooled treatment gas G3. This further prevents droplets from entering. Alternatively, a droplet intrusion prevention member similar to the mesh structure 121 described above may be provided at the outlet for the cooled treatment gas G4, or a heater for vaporizing droplets may be provided.

[0116] The first concentrator 200 has an adsorption rotor 212 containing an adsorbent that adsorbs organic solvents contained in the adsorbent upon contact with a gas and desorbs the adsorbed organic solvent upon contact with a heated gas. The adsorption rotor 212 is composed of a plurality of adsorption units 210 separated by a plurality of partitions. The adsorption rotor 212 has a hollow cylindrical shape as a whole due to the plurality of adsorption units 210. The adsorption rotor 212 is installed in a processing chamber and is provided so as to allow fluid to flow in the radial direction. The adsorption rotor 212 is provided so as to be rotatable about a cylindrical axis by receiving the rotational driving force of a motor.

[0117] In the first concentration device 200, a part of the adsorption unit 210 constitutes an adsorption section that adsorbs the organic solvent contained in the cooling treatment gas G4 supplied from the outside to the inside of the adsorption unit 210, and the remaining part of the adsorption unit 210 constitutes a desorption section that desorbs the organic solvent adsorbed in the adsorption unit 210 from the adsorption unit 210 by supplying heated air from the inside to the outside of the adsorption unit 210.

[0118] During the purification, the cooling process gas G4 supplied into the processing chamber is introduced into the adsorption section from the outer peripheral surface of the adsorption rotor 212. As the cooling process gas G4 introduced into the adsorption section passes through the adsorption rotor 212 in the radial direction from the outer peripheral surface to the inner peripheral surface, the organic solvent is adsorbed by the multiple adsorption units 210 located in the adsorption section, thereby being purified.

[0119] The cooled treatment gas G5, which is the purified fluid to be treated, is discharged as a purified gas from the top of the adsorption unit 210. The discharged purified gas flows through the second flow path F2 as the cooled treatment gas G5 and is supplied to the second concentrator 300.

[0120] The inner circumference-side flow path forming member 211 and the outer circumference-side flow path forming member 213 are disposed facing each other on the inner circumference side and the outer circumference side of the adsorption rotor 212 so as to sandwich a part of the adsorption rotor 212 in the circumferential direction. The region of the adsorption rotor 212 sandwiched between the inner circumference-side flow path forming member 211 and the outer circumference-side flow path forming member 213 is the detachable portion.

[0121] To desorb the organic solvent, high-temperature gas G7, which is part of the cooled treatment gas G5 heated by the regeneration heater 250, is introduced from the inner periphery-side flow path forming member 211 into the desorption section. As the high-temperature gas G7 introduced into the desorption section passes through the adsorption rotor 212, it thermally desorbs the organic solvent adsorbed by the multiple adsorption units 210 located in the desorption section. Desorption gas G8 containing the organic solvent is discharged as a concentrated gas from the desorption section through the outer periphery-side flow path forming member 213, to the outside of the treatment chamber, and returned to the third flow path F3. A portion of the organic solvent contained in the desorption gas G8 is liquefied and condensed, and collected in the tank 125 as desorption condensate L2.

[0122] The third flow path F3 is a section that returns the desorbed gas G8 to the inlet of the exhaust gas G1 of the cooling condensation device 100. The third flow path F3 is preferably connected so that the desorption section is located above the confluence of the desorbed gas G8 and the exhaust gas G1 supplied to the cooling condensation device 100. This arrangement makes it easier for the desorbed condensate L2 generated from the desorbed gas G8 in the first concentrator 200 to migrate to the cooling condensation device 100. The third flow path F3 is preferably configured to be vented to two locations: the inlet of the exhaust gas G1 of the cooling condensation device 100 and the tank 125. This configuration makes it easier for the desorbed condensate L2 generated from the desorbed gas G8 to be directly collected in the tank 125.

[0123] In the first concentrator 200, the adsorption unit 210 located in the adsorption section performs adsorption of the target substance, and after the adsorption, the adsorption unit 210 located in the desorption section performs desorption of the target substance. The adsorption rotor 212 rotates around the cylindrical axis, causing the adsorption unit 210 to move alternately between the desorption section and the adsorption section, and the adsorption and desorption of the target substance are continuously performed.

[0124] Activated alumina, silica gel, activated carbon material, zeolite, etc. can be used as the material of the adsorption element constituting the adsorption unit 210. The shape of the adsorption element in the adsorption unit 210 is not particularly limited, and may be, for example, a honeycomb-shaped sheet containing activated carbon material or zeolite, or a laminate of activated carbon fiber nonwoven fabric.

[0125] The second concentrator 300 has an adsorption element 310 including an adsorbent that adsorbs the organic solvent contained in the gas upon contact with the adsorbent and desorbs the adsorbed organic solvent upon contact with the heated gas. The adsorption element 310 includes a desorption section (desorption zone) 311 and an adsorption section (adsorption zone) 312. When the cooled treatment gas G5 is introduced into the adsorption section 312, the cooled treatment gas G5 comes into contact with the adsorbent, and the organic solvent contained in the cooled treatment gas G5 is adsorbed by the adsorbent. The cooled treatment gas G5 is purified and discharged as purified gas G9.

[0126] In the desorption section 311, a high-temperature gas G10 having a temperature higher than that of the cooled treatment gas G5 is introduced into the adsorbent, whereby the organic solvent is desorbed from the adsorbent, and the desorbed gas G11 containing the organic solvent is discharged. The desorbed gas G11 is returned to the first flow path F1 via the sixth flow path F6.

[0127] In the organic solvent recovery system 1D, the desorbed gas G11 is returned to the first flow path F1, so there is no need to treat the amount of desorbed gas G11 in the cooling and condensing device 100. This makes it possible for the organic solvent recovery system 1D to contribute to the miniaturization and energy conservation of the cooling and condensing device 100. In the organic solvent recovery system 1D, the desorbed gas G11 is at a high temperature, so condensation of NMP (N-methyl-2-pyrrolidone), moisture, and the like contained in the cooled treatment gas G4 can be suppressed.

[0128] Activated alumina, silica gel, activated carbon material, and zeolite are widely used as the adsorbent material contained in the adsorption element 310, and among them, activated carbon and hydrophobic zeolite are particularly preferably used.

[0129] 7, the second concentrator 300 includes a rotating shaft and an adsorption element 310 disposed around the rotating shaft. The second concentrator 300 is configured such that, by rotating the adsorption element 310 around the rotating shaft, the adsorbent that has adsorbed the organic solvent in the cooled treatment gas G5 introduced from the second flow path F2 in the adsorption section 312 is continuously moved to the desorption section 311.

[0130] The second concentrator 300 may have a cleaning section (purging section) to which the portion of the desorption section 311 where the desorption process has been completed is transferred before transferring to the adsorption section 312. A configuration may be adopted in which a portion of the cleaned gas G9 is introduced into the purge section, and the purge section outlet gas discharged from the purge section is introduced into the adsorption section 312. This is because cleaning the adsorbent where desorption has been completed with the cleaned gas G9 prevents the desorbed gas G11 remaining in the adsorbent from being mixed into the cleaned gas G9 and allows the adsorbent to be cooled.

[0131] The high-temperature gas G10 used for desorption is preferably a part of the clean gas G9 heated to a high temperature using a heating means such as a regenerative heater 350. By heating to a high temperature, an increase in the processing flow rate of the organic solvent-containing gas in the adsorption section 312 can be suppressed.

[0132] [Embodiment 2D] 8 is a diagram showing a schematic configuration of an organic solvent recovery system 2D according to embodiment 2D. The organic solvent recovery system 2D is composed of a cooling and condensing device 100, a first concentrating device 200, a second concentrating device 300, and various flow paths. The organic solvent recovery system 2D has the same configuration as the organic solvent recovery system 1D according to embodiment 1D, except that the desorbed gas G11 from the second concentrating device 300 is returned to the regeneration heater 250 via a sixth flow path F6.

[0133] In the organic solvent recovery system 2D, the desorbed gas G11 is returned to the regeneration heater 250, so there is no need to process the amount of airflow of the desorbed gas G11 in the cooling condensation device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 2D can contribute to the miniaturization and energy saving of the cooling condensation device 100 and the first concentrating device 200. In the organic solvent recovery system 2D, the desorbed gas G11 is at a high temperature, so it can contribute to energy saving of the regeneration heater 250.

[0134] [Embodiment 3D] 9 is a diagram schematically illustrating the configuration of an organic solvent recovery system 3D according to embodiment 3D. The organic solvent recovery system 3D is composed of a cooling and condensing device 100, a first concentrator 200, a second concentrator 300, and various flow paths. In the organic solvent recovery system 3D, the desorbed gas G11 from the second concentrator 300 is returned to the fourth flow path F4 via the sixth flow path F6. The organic solvent recovery system 3D has the same configuration as the organic solvent recovery system 1D according to embodiment 1D, except that the desorbed gas G11 from the second concentrator 300 is returned to the fourth flow path F4 via the sixth flow path F6.

[0135] The desorbed gas G11 that has flowed through the sixth flow path F6 flows through the fourth flow path F4 together with the cooled treatment gas G6 discharged from the cooling condensing device 100 and is returned to the second heat exchanger 112. The organic solvent recovery system 3D eliminates the need to treat the amount of desorbed gas G11 in the cooling condensing device 100 and the first concentrating device 200. This makes it possible to reduce the size and energy consumption of the cooling condensing device 100 and the first concentrating device 200. Because the desorbed gas G11 has a high temperature, the organic solvent recovery system 3D can increase the temperature of the fluid flowing through the second heat exchanger 112, thereby contributing to the reduction in size and energy consumption of the second heat exchanger 112 that cools the exhaust gas G1.

[0136] [Embodiment 4D] 10 is a diagram illustrating the schematic configuration of an organic solvent recovery system 4D according to embodiment 4D. The organic solvent recovery system 4D is composed of a cooling and condensing device 100, a first concentrator 200, a second concentrator 300, and various flow paths. In the organic solvent recovery system 4D, the desorbed gas G11 from the second concentrator 300 is returned to the fifth flow path F5 via the sixth flow path F6. The organic solvent recovery system 4D has the same configuration as the organic solvent recovery system 1D according to embodiment 1D, except that the desorbed gas G11 from the second concentrator 300 is returned to the fifth flow path F5 via the sixth flow path F6.

[0137] The desorbed gas G11, which has flowed through the sixth flow path F6, flows through the fifth flow path F5 together with the exhaust gas G1 discharged from the second heat exchanger 112 and a portion of the cooled treatment gas G6, and is returned to the production facility 130. The organic solvent recovery system 4D eliminates the need to treat the amount of desorbed gas G11 in the cooling condensation device 100 and the first concentrating device 200. This allows the organic solvent recovery system 4D to contribute to the miniaturization and energy conservation of the cooling condensation device 100 and the first concentrating device 200. Because the desorbed gas G11 has a high temperature, the organic solvent recovery system 4D can increase the temperature of the exhaust gas G1 that is re-discharged from the production facility 130. This allows the organic solvent recovery system 4D to increase the temperature of the fluid flowing through the second heat exchanger 112, thereby contributing to the miniaturization and energy conservation of the second heat exchanger 112 that cools the exhaust gas G1.

[0138] [Actions and Effects] The organic solvent recovery system 1D in this embodiment includes a cooling and condensing device 100 that cools an exhaust gas G1 containing an organic solvent to liquefy and condense the organic solvent and discharge it as a cooled treated gas G4 with a reduced organic solvent concentration; a first flow path F1 through which a portion of the cooled treated gas G4 flows; a first concentrating device 200 that adsorbs the organic solvent contained in the cooled treated gas G4 introduced from the first flow path F1 using an adsorption unit 210 to discharge the cooled treated gas G5 with a further reduced organic solvent concentration, and introduces high-temperature gas G7 to desorb the organic solvent from the adsorption unit 210 and discharge the desorbed gas G8; a second flow path F2 through which the cooled treated gas G5 flows; and a second concentrating device 300 that adsorbs the organic solvent contained in the cooled treated gas G5 introduced from the second flow path F2 using an adsorption element 310 to discharge the cleaned gas G9 with a further reduced organic solvent concentration, and introduces high-temperature gas G10 to desorb the organic solvent from the adsorption element 310 and discharge the cleaned gas G9.

[0139] The cooling and condensing device 100 includes a second heat exchanger 112 that cools the exhaust gas G1 by heat exchange with a refrigerant. The organic solvent recovery system 1D further includes a fourth flow path F4 that returns the remaining cooled treatment gas G6, which is the portion of the cooled treatment gas other than the portion of the cooled treatment gas G4, to the second heat exchanger 112. The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the first flow path F1. Because the organic solvent recovery system 1D returns the desorbed gas G11 to the first flow path F1, it is not necessary to treat the amount of the desorbed gas G11 in the cooling and condensing device 100. Therefore, the organic solvent recovery system 1D can contribute to the miniaturization and energy conservation of the cooling and condensing device 100. Because the desorbed gas G11 is at a high temperature, the organic solvent recovery system 1D can suppress condensation of NMP (N-methyl-2-pyrrolidone), moisture, and the like contained in the cooled treatment gas G4.

[0140] The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the regeneration heater 250. Since the organic solvent recovery system 2D returns the desorbed gas G11 to the regeneration heater 250, it is not necessary to process the amount of airflow of the desorbed gas G11 in the cooling and condensing device 100 and the first concentrating device 200. Therefore, the organic solvent recovery system 2D can contribute to the miniaturization and energy saving of the cooling and condensing device 100 and the first concentrating device 200. The organic solvent recovery system 2D can contribute to energy saving of the regeneration heater 250 because the desorbed gas G11 is at a high temperature.

[0141] The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the fourth flow path F4. The desorbed gas G11, together with the cooled treatment gas G6, flows through the fourth flow path F4 and is returned to the second heat exchanger 112. The organic solvent recovery system 3D eliminates the need to treat the amount of desorbed gas G11 in the cooling and condensing device 100 and the first concentrating device 200. This allows the organic solvent recovery system 3D to contribute to the miniaturization and energy conservation of the cooling and condensing device 100 and the first concentrating device 200. Because the desorbed gas G11 has a high temperature, the organic solvent recovery system 3D can increase the temperature of the fluid flowing through the second heat exchanger 112, thereby contributing to the miniaturization and energy conservation of the second heat exchanger 112 for cooling the exhaust gas G1.

[0142] The desorbed gas G8 is returned to the cooling and condensing device 100, and the desorbed gas G11 is returned to the fifth flow path F5. The desorbed gas G11, together with the flue gas G1 discharged from the second heat exchanger 112 and a portion of the cooled treatment gas G6, flows through the fifth flow path F5 and is returned to the production facility 130. The organic solvent recovery system 4D eliminates the need to treat the amount of desorbed gas G11 in the cooling and condensing device 100 and the first concentrating device 200. This allows the organic solvent recovery system 4D to contribute to the miniaturization and energy conservation of the cooling and condensing device 100 and the first concentrating device 200. Because the desorbed gas G11 has a high temperature, the organic solvent recovery system 4D can increase the temperature of the flue gas G1 that is re-discharged from the production facility 130. This allows the organic solvent recovery system 4D to increase the temperature of the fluid flowing through the second heat exchanger 112, thereby contributing to the miniaturization and energy conservation of the second heat exchanger 112 that cools the flue gas G1.

[0143] In this embodiment, a plurality of first concentrators 200 are arranged in the circumferential direction around the cylindrical axis of a hollow cylindrical rotor in which adsorption units 210 rotate around the cylindrical axis, thereby enabling highly efficient recovery of organic solvents.

[0144] In the second concentrator 300 of this embodiment, the adsorption element 310 is disposed on a disk-shaped adsorption rotor that rotates around a cylindrical axis, thereby enabling highly efficient recovery of the organic solvent.

[0145] [Other embodiments] In the above embodiment, two concentrators are used: a first concentrator 200 and a second concentrator 300. Depending on the air volume, two first concentrators 200 or two second concentrators 300 may be used. Also, depending on the removal efficiency, three or more concentrators may be used.

[0146] Examples of organic solvents contained in the exhaust gas G1 include organic solvents that can be liquefied and recovered by cooling to 1°C to 50°C. Examples of organic solvents include N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, and n-decane. These are examples, and the present invention is not limited to these. The organic solvent contained may be one type or multiple types.

[0147] [Concentrator] The concentrators used in the above-described embodiments have been described using, as examples, the first concentrator 200, which is a vertically-mounted cylindrical concentrator, and the second concentrator 300, which is a disk-shaped concentrator. The concentrators may also be horizontally-mounted cylindrical concentrators such as those disclosed in WO2016 / 189958 and WO2017 / 170207. The concentrators may also be configured using any combination of vertically-mounted cylindrical concentrators, horizontally-mounted cylindrical concentrators, and disk-shaped concentrators. An example of a vertically-mounted cylindrical concentrator is disclosed in Japanese Patent Application Laid-Open No. 63-84616. An example of a disk-shaped concentrator is disclosed in Japanese Patent Application Laid-Open No. 61-167430. These are all examples, and the concentrators are not limited to those disclosed in the documents listed here.

[0148] The specific configuration of a horizontally placed cylindrical concentrator is described below. Note that a vertically placed cylindrical concentrator means that the axis of the cylinder extends vertically, and a horizontally placed cylindrical concentrator means that the axis of the cylinder extends horizontally.

[0149] Fig. 11 is a vertical cross-sectional view of the concentrator 400. Fig. 12 is a cross-sectional view taken along line XII-XII shown in Fig. 11. Fig. 13 is an enlarged cross-sectional view of a main part of the cylindrical rotor shown in Fig. 11. The concentrator 400 will be described with reference to Figs. 11 to 13.

[0150] 11, the concentrating device 400 adsorbs and removes the target substances contained in the large amount of cooled treatment gas G4 supplied into the treatment chamber 1 using an adsorbent 30 described later, and discharges purified cooled treatment gases G5 and G6 (in Embodiments 1D to 4D, only the cooled treatment gas G5 is discharged). The concentrating device 400 also desorbs the target substances from the adsorbent 30 by spraying high-temperature gas G7 onto the adsorbent 30 containing the adsorbed and removed target substances, and discharges the desorbed gas G8.

[0151] Adsorption of the target substance is performed in the second region R2 (see FIG. 12), which will be described later. Desorption of the target substance is performed in the first region R1 (see FIG. 12), which will be described later. As the cylindrical rotor 90 rotates around the cylindrical axis C, the adsorbent 30 passes through the first region R1 and is positioned in the second region R2, whereby the adsorption is performed, and after the adsorption, the adsorbent 30 passes through the second region R2 and is positioned in the first region R1, whereby the desorption is performed. In this way, in the concentrating device 400, adsorption and desorption are performed continuously.

[0152] As shown in FIGS. 11 to 13, the concentrating device 400 includes a cylindrical rotor 90, a first flow path forming member 2, an inner circumference side flow path forming member 4, and an outer circumference side flow path forming member 5.

[0153] The cylindrical rotor 90 is installed in the processing chamber 1. The cylindrical rotor 90 is a hollow rotor, and has, for example, a substantially cylindrical shape. Note that the shape of the cylindrical rotor 90 is not limited to a cylindrical shape, and may be a polygonal cylindrical shape such as a rectangular cylindrical shape, or an elliptical cylindrical shape.

[0154] The cylindrical rotor 90 has a cylindrical bore 90a that is closed at one end and open at the other end. The cylindrical bore 90a is defined by the inner circumference of the cylindrical rotor 90. The cylindrical rotor 90 is configured to allow fluid to flow radially. The cylindrical rotor 90 is configured to be rotatable around a cylindrical axis C. The cylindrical rotor 90 is arranged so that the cylindrical axis C faces the horizontal direction. Note that the height of the cylindrical rotor 90 in the vertical direction when the cylindrical axis C is arranged horizontally is set to a height that does not interfere with transport. Furthermore, the width of the cylindrical rotor in the horizontal direction when the cylindrical axis C is arranged horizontally is also set to a width that does not interfere with transport.

[0155] The cylindrical rotor 90 is rotatably supported by a plurality of support wheels 7 that abut against the peripheral end surfaces of the pair of plate-like members 10. The plurality of support wheels 7 are installed on the support member 6. Examples of the support wheels 7 include wheels with a flange on one side and wheels with flanges on both sides. By driving the support wheels 7 to rotate around an axis with the horizontal direction as the axial direction, the cylindrical rotor 90 can be rotated around the cylindrical axis C. The support wheels 7 are rotated by a drive device (not shown) such as a motor, and a power transmission mechanism (not shown) such as a shaft and gears.

[0156] Alternatively, the cylindrical rotor 90 may be rotated without rotating the support wheel 7 by rotating a belt, chain, etc. (not shown) wrapped around the cylindrical rotor 90 using a driving device (not shown) such as a motor, and a power transmission mechanism (not shown) such as a shaft and gears.

[0157] The cylindrical rotor 90 is configured by arranging a plurality of adsorbents 30 in a cylindrical shape having a cylindrical hole 90a. The plurality of adsorbents 30 are arranged, for example, in a cylindrical shape. The plurality of adsorbents 30 are lined up in the circumferential direction at a predetermined pitch. The plurality of adsorbents 30 are housed in a plurality of space portions S, which are independent from each other and will be described later. The plurality of adsorbents 30 are configured to be replaceable. The plurality of adsorbents 30 have, for example, a block shape.

[0158] The adsorbent 30 is made of an adsorbent material containing any of activated alumina, silica gel, activated carbon, and zeolite. Preferably, activated carbon or zeolite in granular, powder, honeycomb, or other shapes is used for the adsorbent 30. Activated carbon and zeolite are excellent at adsorbing and desorbing low-concentration organic compounds. Furthermore, by using a honeycomb shape, the pressure loss of the fluid can be reduced, thereby increasing the processing capacity. Furthermore, clogging due to solid matter such as dust can be suppressed.

[0159] The cylindrical rotor 90 includes a pair of plate-shaped members 10 and a plurality of partitions 20. The pair of plate-shaped members 10 are arranged to face each other. The pair of plate-shaped members 10 includes a first plate-shaped member 11 and a second plate-shaped member 12. The first plate-shaped member 11 and the second plate-shaped member 12 have a substantially circular shape according to the shape of the cylindrical rotor 90. Note that the shapes of the first plate-shaped member 11 and the second plate-shaped member 12 are not limited to a substantially circular shape, and may be a polygonal shape such as a rectangle, or an oval shape such as an ellipse.

[0160] The second plate-shaped member 12 is located on one side of the cylindrical rotor 90. The second plate-shaped member 12 has a blocking portion 13. The second plate-shaped member 12 blocks one end of the cylindrical hole 90a. The blocking portion 13 is, for example, a part of the second plate-shaped member 12, and is located in the center of the second plate-shaped member 12. Note that the blocking portion 13 may be formed as a separate member from the second plate-shaped member 12, as long as it is able to block one end of the cylindrical hole 90a as described above. For example, the second plate-shaped member 12 may have an opening that communicates with the cylindrical hole 90a, and the blocking portion 13 may be a blocking member that blocks the opening of the second plate-shaped member 12.

[0161] The first plate-shaped member 11 is located on the other side of the cylindrical rotor 90. The first plate-shaped member 11 has an opening 11a. The opening 11a communicates with the other end of the cylindrical hole 90a. The opening 11a is provided in the center of the first plate-shaped member 11.

[0162] The first plate-shaped member 11 and the second plate-shaped member 12 are provided at a distance from each other so that the partition body 20 and the adsorber 30 can be placed between them.

[0163] Each of the plurality of partitions 20 is disposed between adjacent adsorbents 30. The plurality of partitions 20 form a plurality of spaces S in which the plurality of adsorbents 30 are disposed. Specifically, the plurality of partitions 20 divide the space between the pair of plate-like members 10 in the circumferential direction into a plurality of space sections S (see FIG. 13) that are independent from each other. The plurality of partitions 20 are disposed such that their centers O (see FIG. 13) are aligned in the circumferential direction at a predetermined pitch. The plurality of partitions 20 are attached between the pair of plate-like members 10 so as to be airtight and / or liquidtight in the direction of the cylindrical axis C.

[0164] One end side of the first flow path forming member 2 is configured to allow the cylindrical rotor 90 to rotate about the cylindrical axis C while maintaining an airtight seal between the interior of the first flow path forming member 2 and the cylindrical hole 90a of the cylindrical rotor 90. Specifically, for example, a flange portion is provided on one end side of the first flow path forming member 2, and an annular seal member is sandwiched between the flange portion and a portion of the first plate-like member 11 located on the periphery of the opening 11a. The other end side of the first flow path forming member 2 is drawn out to the outside of the processing chamber 1.

[0165] An inner circumference-side flow path forming member 4 is disposed in a cylindrical hole 90a provided on the inner circumference side of the cylindrical rotor 90. An outer circumference-side flow path forming member 5 is disposed on the outer circumference side of the cylindrical rotor 90. The inner circumference-side flow path forming member 4 and the outer circumference-side flow path forming member 5 are disposed facing each other on the inner circumference side and the outer circumference side of the cylindrical rotor 90 so as to sandwich a part of the cylindrical rotor 90 in the circumferential direction.

[0166] The inner circumference-side flow path forming member 4 extends inside the cylindrical hole 90a along the direction of the cylindrical axis C. The inner circumference-side main flow path forming member 4 is provided so as to extend outward from the opening at the other end of the cylindrical hole 90a (more specifically, from the opening 11a of the first plate-shaped member 11).

[0167] An inner circumferential opening end 4a that faces the inner circumferential side of the cylindrical rotor 90 is provided on one end side of the inner circumferential flow path forming member 4. The opening surface of the inner circumferential opening end 4a is provided so as to face a partial region of the inner circumferential side of the cylindrical rotor 90 in the circumferential direction. The opening surface is also provided so as to face the inner circumferential side of the cylindrical rotor 90 in the direction of the cylindrical axis C, extending between the first plate-shaped member 11 and the second plate-shaped member 12 of the inner circumferential flow path forming member 4. The other end side of the inner circumferential flow path forming member 4 protrudes to the outside of the first flow path forming member 2 from an opening 2a provided in the first flow path forming member 2.

[0168] An outer circumferential side opening end 5a is provided on one end side of the outer circumferential side flow path forming member 5, facing the outer circumferential side of the cylindrical rotor 90. The opening surface of the outer circumferential side opening end 5a is provided so as to face a partial region of the outer circumferential side of the cylindrical rotor in the circumferential direction. The opening surface is provided so as to face the outer circumferential side of the cylindrical rotor 90 in the direction of the cylindrical axis C, extending between the first plate-shaped member 11 and the second plate-shaped member 12.

[0169] 12, the concentrating device 400 includes a first region R1 (see FIG. 12) and a second region R2 (see FIG. 12) that are circumferentially partitioned. The plurality of adsorbents 30 move alternately between the first region R1 and the second region R2 as the cylindrical rotor 90 rotates around the cylindrical axis C.

[0170] 13, the first region R1 is a region in which a portion of the plurality of adsorbents 30 that move in association with the rotation of the cylindrical rotor 90 communicates airtight or liquidtight with the inner circumference-side flow path-forming member 4 and the outer circumference-side flow path-forming member 5. More specifically, the first region R1 is a region in which a portion of the plurality of spaces S that move in association with the rotation of the cylindrical rotor 90 communicates airtight with the inner circumference-side flow path-forming member 4 and the outer circumference-side flow path-forming member 5.

[0171] The first region R1 is also a region where the fluid is introduced into the adsorbent 30. As will be described later, the first region R1 is also a region where the fluid that has passed through the inside of the inner periphery-side flow path forming member 4 is introduced into the adsorbent 30 from the inner periphery side toward the outer periphery side of the cylindrical rotor 90.

[0172] In addition, the flow of the fluid may be reversed, and the first region R1 may be a region where the fluid is introduced into the adsorbent 30 from the outer side toward the inner side of the cylindrical rotor 90 so as to be introduced into the inner side flow path forming member 4.

[0173] As described below, the second region R2 is a region where fluid is introduced into the adsorbent 30 from the outer side toward the inner side of the cylindrical rotor 90 so as to pass through the cylindrical hole 90a located around the inner side flow path forming member 4 and flow out from the opening at the other end of the cylindrical hole 90a.

[0174] In addition, the second region may be a region where a fluid that flows in from the opening at the other end of the cylindrical hole 90a and passes through the cylindrical hole 90a located around the inner circumference side flow path forming member 4 is introduced into the adsorbent 30 from the inner circumference side toward the outer circumference side of the cylindrical rotor 90.

[0175] The cylindrical rotor 90 includes a seal member 40 provided on each of the plurality of partitions 20. Each of the plurality of partitions 20 includes a main body 21 and a mounting portion 22 for mounting the seal member 40. The main body 21 has, for example, a triangular cylindrical shape. The mounting portion 22 has an inner mounting portion 23 and an outer mounting portion 24.

[0176] The inner installation portion 23 has a plate-like shape. The inner installation portion 23 is provided so as to extend in the direction of the cylindrical axis C. The inner installation portion 23 is provided so as to protrude from the top edge portion of the main body portion 21 located on the inner side of the cylindrical rotor 90 toward the radially inward direction of the cylindrical rotor 90. The inner installation portion 23 may be configured integrally with the main body portion 21, or may be configured as a separate member from the main body portion 21. The inner installation portion 23 has an inner installation surface 23a on which an inner seal member 41, which will be described later, is to be installed. The inner installation surface 23a intersects with the rotation direction of the cylindrical rotor 90.

[0177] The outer peripheral installation portion 24 has a plate-like shape. The outer peripheral installation portion 24 is provided to extend in the direction of the cylindrical axis C. The outer peripheral installation portion 24 is provided to protrude radially outward from the side surface of the main body portion 21 located on the outer peripheral side of the cylindrical rotor 90. The outer peripheral installation portion 24 may be formed integrally with the main body portion 21 or may be formed as a separate member from the main body portion 21. Note that if the outer peripheral installation portion 24 is formed as a separate member from the main body portion 21, the outer peripheral installation portion 24 has a shape that can be attached to the main body portion 21, such as an L-shape. The outer peripheral installation portion 24 has an outer peripheral installation surface 24a on which an outer seal member 42, described later, is mounted. The outer peripheral installation surface 24a intersects with the rotation direction of the cylindrical rotor 90.

[0178] The seal member 40 is made of, for example, an elastic rubber material and includes an inner seal member 41 located on the inner circumferential side of the cylindrical rotor 90 and an outer seal member 42 located on the outer circumferential side of the cylindrical rotor 90.

[0179] The inner seal member 41 is installed on an inner installation surface 23a, which is located on the inner circumferential side of the cylindrical rotor 90, among the installation surfaces of the partition body 20. The inner seal member 41 extends from one end side to the other end side of the cylindrical hole 90a. More specifically, the inner seal member 41 extends between the pair of plate-like members 10 from one plate-like member (second plate-like member 12) to the other plate-like member (first plate-like member 11). The inner seal member 41 protrudes from the partition body 20 toward the radially inner side of the cylindrical rotor 90.

[0180] The outer seal member 42 is installed on an outer peripheral installation surface 24a, which is located on the outer peripheral side of the cylindrical rotor 90, among the installation surfaces of the partition body 20. The outer seal member 42 extends from one end side to the other end side of the cylindrical hole 90a. More specifically, the outer seal member 42 extends between the pair of plate-shaped members 10 from one plate-shaped member (second plate-shaped member 12) to the other plate-shaped member (first plate-shaped member 11). The outer seal member 42 protrudes from the partition body 20 toward the radially outer side of the cylindrical rotor 90.

[0181] In the inner flow path forming member 4, inner curved surfaces 4b, 4c that curve along the rotation direction are provided on the front edge of the inner opening end 4a, which is located on the front side in the rotation direction of the cylindrical rotor 90, and on the rear edge of the inner opening end 4a, which is located on the rear side in the rotation direction of the cylindrical rotor 90.

[0182] In the outer circumferential flow path forming member 5, outer circumferential curved surfaces 5b, 5c that curve along the rotation direction are provided on the front edge of the outer circumferential opening end 5a located on the front side in the rotation direction of the cylindrical rotor 90 and the rear edge of the outer circumferential opening end 5a located on the rear side in the rotation direction of the cylindrical rotor 90, respectively.

[0183] As the cylindrical rotor 90 rotates, the inner seal member 41 slides against the inner curved surfaces 4b, 4c, and the outer seal member 42 slides against the outer curved surfaces 5b, 5c, so that some of the multiple spaces S are airtightly connected to the inner flow path forming member 4 and the outer flow path forming member 5.

[0184] Specifically, the space S located between the partition 20 located between the inner curved surface 4b and the outer curved surface 5b and the partition 20 located between the inner curved surface 4c and the outer curved surface 5c is airtightly connected to the inner flow path forming member 4 and the outer flow path forming member 5.

[0185] In this way, the concentration device 400 is divided into a first region R1 that is airtightly connected to the inner circumference-side flow path forming member 4 and the outer circumference-side flow path forming member 5, and a second region R2 that is not connected to the inner circumference-side flow path forming member 4 and the outer circumference-side flow path forming member 5 and that forms a flow path different from the first region R1.

[0186] 11 and 13, a fluid is introduced into the first region R1 and the second region R2. The direction in which the fluid flows through the second region R2 and the direction in which the fluid flows through the first region R1 are preferably opposite to each other in the radial direction of the cylindrical rotor 90.

[0187] In the second region R2, the fluid is introduced into the adsorbent 30 from the outer periphery side toward the inner periphery side of the cylindrical rotor 90 so as to pass through the cylindrical hole 90a of the cylindrical rotor 90 located around the inner periphery side flow path forming member 4 and flow out from the opening at the other end of the cylindrical hole 90a.

[0188] On the other hand, in the first region R1, the fluid that has passed through the inside of the inner periphery side flow path forming member 4 is introduced into the adsorbent 30 from the inner periphery side of the cylindrical rotor 90 toward the outer periphery side.

[0189] The fluid introduced into the second region R2 is a fluid to be treated, such as exhaust gas. The fluid to be treated contains an organic solvent as a substance to be treated. In the second region R2, the fluid to be treated is purified.

[0190] During the purification, first, exhaust gas is introduced into the second region R2 of the concentrating device 400 from the outer periphery toward the inner periphery of the cylindrical rotor 90. As the exhaust gas introduced into the second region R2 passes through the cylindrical rotor 90 in the radial direction, the organic solvent is adsorbed and removed by the multiple adsorbents 30 located in the second region R2, thereby purifying the exhaust gas.

[0191] The purified exhaust gas is discharged as clean air from the second region R2 into the cylindrical hole 90a of the cylindrical rotor 90. The clean air discharged into the cylindrical hole 90a of the cylindrical rotor 90 passes through the cylindrical hole 90a located around the inner circumference side flow path forming member 4 and flows out from the opening at the other end of the cylindrical hole 90a (more specifically, the opening 11a of the first plate-shaped member 11). The clean air flowing out from the opening at the other end of the cylindrical hole 90a passes through the first flow path forming member 2 and is discharged to the outside of the processing chamber 1.

[0192] The fluid introduced into the first region R1 is a heated fluid such as heated air. In the first region R1, the organic solvent adsorbed in the adsorbent 30 is desorbed, thereby regenerating the adsorbent 30 and generating a concentrated fluid with a high concentration of the organic solvent.

[0193] To desorb the organic solvent, heated air is introduced from the other end side of the inner circumference-side flow path forming member 4. The heated air introduced from the other end side of the inner circumference-side flow path forming member 4 passes through the inside of the inner circumference-side flow path forming member 4 and is introduced into the first region R1 from one end side of the inner circumference-side flow path forming member 4.

[0194] As the heated air introduced into the first region R1 passes through the cylindrical rotor 90 from the inner periphery to the outer periphery of the cylindrical rotor 90, the heat causes the organic solvent adsorbed to the plurality of adsorbents 30 located in the first region R1 to be desorbed. The heated air containing the organic solvent is discharged as a concentrated fluid from the first region R1 to the outer periphery-side flow path forming member 5. The concentrated fluid discharged to the outer periphery-side flow path forming member 5 is introduced into a post-treatment device where post-treatment such as recovery or combustion is performed.

[0195] By configuring the concentrator 400 as described above and arranging the cylindrical rotor 90 so that the cylindrical axis C faces horizontally, the rotation axis (cylindrical axis C) becomes stable, and the cylindrical rotor 90 can be rotated stably.

[0196] Furthermore, by arranging the cylindrical rotor 90 so that the cylindrical axis C faces horizontally, it is possible to suppress an increase in the overall vertical height compared to when multiple cylindrical rotors 90 with their cylindrical axes C facing vertically are arranged vertically. The vertical height of the cylindrical rotor 90 when the cylindrical axis C is arranged horizontally is configured to a height that does not interfere with transportation, so the concentrating device 400 can be made a practical size that does not interfere with transportation. This allows the concentrating device 400 to be transported stably.

[0197] Furthermore, by designing the cylindrical rotor 90 so that the width of the cylindrical rotor 90 in the horizontal direction is increased when the cylindrical rotor 90 is arranged so that the cylindrical axis C faces horizontally, the number of adsorbents 30 to be installed or the volume of the adsorbents 30 can be increased. This also increases the adsorption capacity of the concentrator 400. As a result, more fluid can be treated.

[0198] In the present embodiment, the fluid introduced into the second region R2 is exhaust gas containing an organic solvent, and the fluid introduced into the first region R1 is heated air. However, the present invention is not limited to this. The fluid introduced into the second region R2 may be wastewater containing an organic solvent, and the fluid introduced into the first region R1 may be water vapor. In this way, when a liquid is caused to flow, the inner circumference-side flow path-forming member 4 and the outer circumference-side flow path-forming member 5 are configured to be in liquid-tight communication with the first region R1.

[0199] In this embodiment, the fluid to be treated may be introduced into the adsorbent 30 from the outer periphery of the cylindrical rotor 90 toward the inner periphery in the second region R2.

[0200] In addition, in the first region R1, the heating fluid may be introduced into the adsorbent 30 from the inner periphery side toward the outer periphery side of the cylindrical rotor 90 so as to be introduced into the inner periphery side flow path forming member 4.

[0201] Furthermore, the fluid to be treated may be introduced into the second region R2 and the heated fluid into the first region R1 so that the flow direction of the fluid passing through the second region R2 and the flow direction of the fluid passing through the first region R1 are the same in the radial direction of the cylindrical rotor 90.

[0202] Although the cylindrical rotor 90 has been described as a single rotor, multiple rotors may be arranged in a straight line along the cylindrical axis C. This can significantly increase the adsorption capacity and throughput. Also, one cylindrical rotor 90 may be divided into multiple rotors by plates. This can stably hold the cylindrical rotors 90.

[0203] [Actions and Effects] The organic solvent recovery system in this embodiment includes a cooling and condensing device 100 that cools an exhaust gas G1 containing an organic solvent to liquefy and condense the organic solvent and discharge it as a cooled treated gas G4 with a reduced organic solvent concentration; a first flow path F1 through which the cooled treated gas G4 flows; a concentrating device 400 that adsorbs the organic solvent contained in the cooled treated gas G4 introduced from the first flow path F1 using an adsorbent 30 to discharge it as a cooled treated gas G5 with a further reduced organic solvent concentration, and introduces high-temperature gas G7 to desorb the organic solvent from the adsorbent 30 and discharge it as a desorbed gas G8; a second flow path F2 through which the cooled treated gas G5 flows; and a second concentrating device 300 that adsorbs the organic solvent contained in the cooled treated gas G5 introduced from the second flow path F2 using an adsorption element 310 to discharge it as a clean gas G9 with a further reduced organic solvent concentration, and introduces high-temperature gas G10 to desorb the organic solvent from the adsorption element 310 and discharge it as a desorbed gas G11. The concentrating device 400 includes a hollow cylindrical rotor 90 in which the adsorbent 30 is arranged in a cylindrical shape having a cylindrical hole 90a and which is rotatable around a cylindrical axis C. The cylindrical axis C of the cylindrical rotor 90 extends in the horizontal direction.

[0204] This allows the organic solvent to be recovered with high efficiency, and since the cylindrical rotor 90 is arranged so that the cylindrical axis C is oriented horizontally, the rotation axis (cylindrical axis C) is stabilized, allowing the cylindrical rotor 90 to rotate stably.

[0205] In the organic solvent recovery system, the cooling condensation device 100 further includes a mesh structure 121 that separates the condensed organic solvent from the cooled exhaust gas G3 by contacting the mesh structure 121 with the cooled exhaust gas G2, and a chamber 123 that stores the cooled exhaust gas G3 for a certain period of time after passing through the mesh structure 121. This allows the organic solvent to be recovered from the exhaust gas G1 with high efficiency.

[0206] In the organic solvent recovery system, the cooling and condensing device 100 further includes a first heat exchanger 111 and a second heat exchanger 112 that perform cooling by heat exchange with a refrigerant, thereby enabling the organic solvent to be recovered with high efficiency.

[0207] In the organic solvent recovery system, the second concentrator 300 is arranged on a disk-shaped adsorption rotor in which the adsorption element 310 rotates around a cylindrical axis, thereby enabling highly efficient recovery of the organic solvent.

[0208] [Other embodiments] In the above embodiment, depending on the air volume, any two of the concentrators may be used: the first concentrator 200, which is a vertically placed cylindrical concentrator; the second concentrator 300, which is a disk-shaped concentrator; and the horizontally placed cylindrical concentrator 400. Also, depending on the removal efficiency, three or more concentrators may be used.

[0209] Examples of organic solvents contained in the exhaust gas G1 include organic solvents that can be liquefied and recovered by cooling to 1°C to 50°C. Examples of organic solvents include N-methyl-2-pyrrolidone, N-ethyl-2-pyrrolidone, N,N-dimethylformamide, N,N-dimethylacetamide, and n-decane. These are examples, and the present invention is not limited to these. The organic solvent contained may be one type or multiple types.

[0210] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not the above description, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0211] 2B, 2C, 2D, 3C, 3D, 4C, 4D Organic solvent recovery system, 100 Cooling and condensing device, 110 Cooling section, 111 First heat exchanger, 112 Second heat exchanger, 120 Separation section, 121 Mesh structure, 123 Chamber, 125 Tank, 127 Ceiling section, 128 Partition section, 130 Production equipment, 200 First concentrator, 210 Adsorption unit, 211 Inner circumference side flow path forming member, 212 Adsorption rotor, 213 Outer circumference side flow path forming member, 250, 350 Regeneration heater, 300 Second concentrator, 310 Adsorption element, 311 Desorption section, 312 Adsorption section, F1 First flow path, F2 Second flow path, F3 Third flow path, F4 Fourth flow path, F5 Fifth flow path, F6 Sixth flow path: G1, G2 exhaust gas, G3, G4, G5, G6 cooled treatment gas, G7, G10 high-temperature gas, G8, G11 desorption gas, G9 clean gas, L1 cooled condensate, L2 desorption condensate, L3 recovered liquid.

Claims

1. 1. An organic solvent recovery system for recovering an organic solvent from an exhaust gas containing the organic solvent discharged from a production facility, comprising: a cooling and condensing device that cools the exhaust gas containing the organic solvent to liquefy and condense the organic solvent and discharges the cooled treated gas in which the concentration of the organic solvent in the exhaust gas has been reduced; a cooling gas flow path through which the cooling treatment gas flows; a concentrating device that adsorbs the organic solvent contained in the cooled process gas introduced from the cooling gas flow path using an adsorption element, discharges the resultant process gas having a further reduced concentration of the organic solvent, and introduces a high-temperature gas to desorb the organic solvent from the adsorption element and discharges the resultant process gas as a desorbed gas; a desorption gas flow path through which the desorption gas is introduced into the cooling and condensing device, the cooling and condensing device includes a cooling unit through which the exhaust gas flows, and a separation unit located downstream of the cooling unit when viewed along a flow direction of the exhaust gas, the separation unit includes a receiving unit that receives a cooling condensate containing the organic solvent cooled in the cooling unit, a mesh structure that separates the cooling condensate from the cooled treatment gas by bringing the cooled exhaust gas into contact with the mesh structure, and a chamber that stores the cooled treatment gas for a certain period of time after passing through the mesh structure, When viewed along the flow direction of the exhaust gas, the direction in which the exhaust gas flows from the cooling section to the separation section intersects with the direction in which the exhaust gas flows from the mesh structure to the chamber within the separation section, causing the exhaust gas to flow in an L-shaped direction, an organic solvent recovery system, wherein a heater for heating the cooled treatment gas is disposed downstream of the mesh structure;

2. 2. The organic solvent recovery system according to claim 1, wherein a weir is provided in the chamber to prevent the cooled condensate from flowing into the cooling gas flow path.

3. The concentrator includes a first concentrator and a second concentrator located downstream of the first concentrator; the first concentrator adsorbs the organic solvent contained in the cooled process gas introduced from the cooled gas flow path in a first adsorption element, and discharges the resultant first process gas in which the concentration of the organic solvent is further reduced; and introduces a high-temperature gas to desorb the organic solvent from the first adsorption element, and discharges the resultant first desorbed gas; the organic solvent recovery system further includes a first treated gas flow path through which a portion of the first treated gas flows, 3. The organic solvent recovery system according to claim 1, wherein the second concentrator adsorbs the organic solvent contained in the first treated gas introduced from the first treated gas flow path using a second adsorption element, discharges the second treated gas in which the concentration of the organic solvent is further reduced, and introduces high-temperature gas to desorb the organic solvent from the second adsorption element and discharges the second desorbed gas.

4. 4. The organic solvent recovery system according to claim 3, wherein a plurality of the first concentrators are arranged in a circumferential direction around the cylindrical axis of a hollow cylindrical rotor that rotates around the cylindrical axis of the first adsorption element.

5. 5. The organic solvent recovery system according to claim 3, wherein the second concentrator includes a disk-shaped adsorption rotor in which the second adsorption element is arranged and rotates around a cylindrical axis.

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