Tail gas treatment system in production of ethylene sulfite

Abstract

The utility model provides a tail gas treatment system in production of ethylene sulfite. The tail gas treatment system comprises a tower body, a demisting assembly and a gas washing assembly, the inner cavity of the tower body is divided into a lower demisting area and an upper gas washing area by a separation net; the demisting assembly is arranged in the demisting area and comprises a demisting pipe coaxial with the tower body, the upper end of the demisting pipe is connected with the tail gas inlet pipe, and a plurality of baffle plates and a plurality of demisting filler layers arranged between the demisting pipe and the tower body are arranged in the demisting pipe; the gas washing assembly is arranged in the gas washing area and comprises a columnar grid frame, a carbon adsorption filler layer filled in the columnar grid frame and a mounting plate arranged along the outer edge of the top of the columnar grid frame; the outer edge of the mounting plate is attached to the inner side wall of the tower body. According to the tail gas treatment system in the production of the ethylene sulfite, organic impurities, thionyl chloride and trace sulfur dioxide in tail gas can be removed, residual hydrochloric acid gas is recycled, resource utilization of the hydrochloric acid gas is realized, and meanwhile, pollution to the atmospheric environment is prevented.

Description

Technical Field

[0001] The utility model belongs to the field of vinyl sulfite production equipment, in particular to a tail gas treatment system in the production of vinyl sulfite. Background Art

[0002] Ethylene sulfite can be used as an organic solvent for lithium-ion battery electrolytes and as an additive for lithium-ion battery electrolytes. Adding ethylene sulfite to lithium-ion battery electrolytes can greatly improve the storage stability of the battery and the low-temperature performance of the electrolyte. In addition, ethylene sulfite can also be used in organic synthesis and the preparation of pharmaceutical intermediates, and has a wide range of uses.

[0003] At present, vinyl sulfite is usually prepared by reacting thionyl chloride and ethylene glycol. The main components of the tail gas produced during the preparation process are hydrochloric acid gas, trace amounts of sulfur dioxide, unreacted thionyl chloride and trace amounts of organic impurities. This type of tail gas needs to be further treated to prevent pollution to the atmospheric environment. In addition, since this type of tail gas contains a large amount of hydrochloric acid gas, if the remaining components can be removed and the hydrochloric acid gas can be recovered, the resource reuse of the hydrochloric acid gas can be achieved. Utility Model Content

[0004] In view of this, in order to solve the above technical problems, the utility model proposes a tail gas treatment system in the production of vinyl sulfite, which can effectively remove organic impurities, unreacted thionyl chloride and trace amounts of sulfur dioxide in the tail gas through reasonable structural design, and the remaining hydrochloric acid gas can be subsequently recovered to realize the resource utilization of hydrochloric acid gas and prevent pollution to the atmospheric environment.

[0005] In order to achieve the above object, the technical solution of the utility model is implemented as follows:

[0006] A tail gas treatment system in the production of vinyl sulfite, comprising:

[0007] The tower body has an exhaust port at the top and a sewage outlet at the bottom; the inner cavity of the tower body is divided into a demisting area at the bottom and a gas washing area at the top by a partition net;

[0008] A demisting assembly, the demisting assembly is arranged in the demisting area, and includes a primary demisting assembly and a secondary demisting assembly; the primary demisting assembly includes a demisting pipe vertically arranged coaxially with the tower body, the upper end of the demisting pipe is connected to the exhaust gas inlet pipe, and a plurality of baffles are arranged in the demisting pipe along the gas flow direction; the secondary demisting assembly includes a plurality of demisting filler layers spaced apart in the vertical direction between the outer side wall of the demisting pipe and the inner side wall of the tower body;

[0009] A scrubbing assembly is arranged in the scrubbing area, comprising a columnar grid frame, a carbon adsorption filler layer filled in the columnar grid frame, and a mounting plate arranged along the top outer edge of the columnar grid frame; the outer edge of the mounting plate is in contact with the inner wall of the tower body.

[0010] The tail gas enters the demister pipe through the tail gas inlet pipe, and collides with the baffle plate during the downward flow in the demister pipe. The thionyl chloride and organic impurity droplets in the tail gas gather, slide down along the baffle plate, flow out from the lower end of the demister pipe and drip to the sewage outlet at the bottom of the tower body; after the gas flows out, it rises and passes through the secondary demister assembly. Under the action of the demister packing layer, the residual thionyl chloride and organic impurities are further removed, and the removal effect is good. The primary demister assembly and the secondary demister assembly adopt the method of inner and outer nesting, which not only expands the tail gas flow path and increases the contact area, but also can make the equipment structure compact and small in size; the tail gas with thionyl chloride and organic impurities removed enters the scrubbing area through the partition net, and flows in from the side and bottom of the scrubbing assembly at the same time, which expands the contact area and improves the processing efficiency. After the sulfur dioxide is adsorbed by the carbon adsorption packing layer, basically only hydrochloric acid gas is left in the tail gas. At this time, the treated tail gas with hydrochloric acid gas is discharged from the exhaust port and sent to the subsequent hydrochloric acid gas recovery process to recover the hydrochloric acid gas and realize the resource utilization of the hydrochloric acid gas.

[0011] Furthermore, the tower body includes a tower body, a detachable tower cover arranged on the top of the tower body, and a detachable tower bottom cover arranged on the bottom of the tower body; the exhaust port is arranged on the tower top cover, and the sewage outlet is arranged on the tower bottom cover.

[0012] Furthermore, the tower body is composed of two detachably connected tower body units; the partition net is located in the upper tower body unit; the upper end of the defogger pipe is located in the upper tower body unit, and the lower end extends to the inner cavity of the tower lower cover; the secondary defogger assembly is located in the lower tower body unit.

[0013] The tower body adopts a split connection structure. The tower body can be disassembled by removing the tower upper cover, two-section tower body units, and tower lower cover, which is convenient for later maintenance and replacement of various components in the tower.

[0014] Furthermore, the baffles are arranged to be tilted downward, and adjacent baffles are arranged in a staggered manner to achieve multiple collisions with the exhaust gas.

[0015] Furthermore, a filter screen is provided below the secondary defogger assembly; the lower end of the defogger pipe passes through the filter screen and extends to below the filter screen.

[0016] Furthermore, a support ring seat is provided on the side wall of the demisting area, and the demisting filler layer is arranged on the support ring seat, so as to facilitate the disassembly, assembly and replacement of the demisting filler layer.

[0017] Furthermore, the demisting filling layer includes an outer frame, polyhedral hollow balls filled in the outer frame, and a mesh cover covering the outer frame. This structure facilitates the disassembly and replacement of the polyhedral hollow balls. A channel for the demisting pipe to pass through is provided at the center of the demisting filling layer, and an anti-leakage sealing ring is provided between the passing channel and the outer side wall of the demisting pipe.

[0018] Furthermore, a mounting ring seat is provided on the side wall of the scrubbing area, and the mounting plate is mounted on the mounting ring seat to facilitate the disassembly, assembly and replacement of the scrubbing assembly.

[0019] Compared with the prior art, the tail gas treatment system in the production of vinyl sulfite described in the utility model has the following advantages:

[0020] (1) The tail gas treatment system in the production of vinyl sulfite described in the utility model has a reasonable structural design. The primary defogger assembly and the secondary defogger assembly are arranged in a nested manner, which not only ensures that the equipment structure is compact and small in size, but also expands the tail gas flow path, increases the contact area, and effectively removes organic impurities and unreacted thionyl chloride in the tail gas. At the same time, by arranging a scrubber assembly, the scrubber assembly is integrated above the defogger assembly to reduce the equipment footprint. At the same time, the special structure of the scrubber assembly is utilized to allow the tail gas to flow in from the side and bottom of the scrubber assembly at the same time, thereby expanding the contact area and improving the treatment efficiency, so that the carbon adsorption filler layer can timely adsorb sulfur dioxide in the tail gas. The tail gas containing a large amount of hydrochloric acid gas is finally discharged through the exhaust port and sent to the subsequent hydrochloric acid gas recovery process, thereby preventing pollution to the atmospheric environment and realizing the resource utilization of hydrochloric acid gas.

[0021] (2) The tower structure of the tail gas treatment system in the production of vinyl sulfite described in the utility model adopts a multi-section detachable structure. The tower body can be disassembled by removing the tower cover, the two-section tower body unit, and the tower bottom cover. The rational layout of the demisting component and the scrubbing component in the tower body facilitates the subsequent maintenance and replacement of various components in the tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the accompanying drawings:

[0023] Figure 1 This is a schematic diagram of the structure of the tail gas treatment system in the production of vinyl sulfite described in an embodiment of the utility model.

[0024] Description of reference numerals:

[0025] 1-tower body, 2-demist assembly, 3-gas washing assembly, 4-tower body, 5-tower upper cover, 6-tower lower cover, 7-exhaust port, 8-drainage port, 9-partition net, 10-demist area, 11-gas washing area, 12-demist pipe, 13-exhaust gas inlet pipe, 14-baffle, 15-demist packing layer, 16-support ring seat, 17-outer frame, 18-polyhedral hollow ball, 19-grid cover, 20-filter screen plate, 21-columnar grid frame, 22-carbon adsorption packing layer, 23-mounting plate, 24-mounting ring seat. DETAILED DESCRIPTION

[0026] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other.

[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0029] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0030] like Figure 1 As shown, a tail gas treatment system in the production of vinyl sulfite includes a tower body 1, a demisting component 2, and a gas washing component 3;

[0031] The tower body 1 includes a tower body 4 composed of two detachable tower body units, a detachable tower upper cover 5 arranged on the top of the tower body 4, and a detachable tower lower cover 6 arranged on the bottom of the tower body 4; the tower upper cover 5 is provided with an exhaust port 7, and the tower lower cover 6 is provided with a sewage outlet 8; the inner cavity of the tower body 1 is divided into a demisting area 10 located at the bottom and a gas washing area 11 located at the top by a partition 9, and the partition 9 is located in the upper tower body unit;

[0032] The demisting assembly 2 is arranged in the demisting area 10, including a primary demisting assembly and a secondary demisting assembly; the primary demisting assembly includes a demisting pipe 12 which is coaxially arranged vertically with the tower body 1, the upper end of the demisting pipe 12 is located in the upper tower body unit and is connected to the exhaust gas inlet pipe 13, and the lower end of the demisting pipe 12 extends to the inner cavity of the tower lower cover 6; a plurality of baffles 14 are arranged in the demisting pipe 12 along the gas flow direction, the baffles 14 are arranged obliquely downward, and adjacent baffles 14 are arranged in a staggered manner; the secondary demisting assembly is located in the lower tower body unit; the secondary demisting assembly includes a plurality of baffles 14 which are arranged at intervals along the vertical direction on the outer wall of the demisting pipe 12 A demisting packing layer 15 is provided between the inner side wall of the tower body 1; a support ring seat 16 is provided on the side wall of the demisting zone 10, and the demisting packing layer 15 is arranged on the support ring seat 16; the demisting packing layer 15 includes an outer frame 17, multi-faceted hollow balls 18 filled in the outer frame 17, and a mesh cover 19 covering the outer frame 17; a channel for the demisting pipe 12 to pass through is provided at the center of the demisting packing layer 15, and an air leakage-proof sealing ring is provided between the channel and the outer side wall of the demisting pipe 12; a filter screen plate 20 is also provided below the secondary demisting assembly; the lower end of the demisting pipe 12 passes through the filter screen plate 20 and extends to the bottom of the filter screen plate 20;

[0033] The scrubbing assembly 3 is arranged in the scrubbing area 11, including a columnar grid frame 21, a carbon adsorption filler layer 22 filled in the columnar grid frame 21, and a mounting plate 23 arranged along the top outer edge of the columnar grid frame 21; a mounting ring seat 24 is provided on the side wall of the scrubbing area 11, and the mounting plate 23 is mounted on the mounting ring seat 24, and the outer edge of the mounting plate 23 is in contact with the inner wall of the tower body 1.

[0034] The tail gas treatment system in the production of vinyl sulfite described in the utility model works as follows:

[0035] The tail gas enters the demister pipe 12 through the tail gas inlet pipe 13. In the process of flowing downward in the demister pipe 12, it collides with the baffle plate 14. The thionyl chloride and organic impurity droplets in the tail gas gather, slide along the baffle plate 14, flow out from the lower end of the demister pipe 12 and drip to the sewage outlet 8 at the bottom of the tower body 1. After the gas flows out, it rises and passes through the secondary demister assembly. Under the action of the demister packing layer 15, the remaining thionyl chloride and organic impurity droplets collide and gather again and are further removed; the tail gas with thionyl chloride and organic impurities removed enters the scrubbing area 11 through the partition 9, flows in from the side and bottom of the scrubbing assembly 3 at the same time, and after sulfur dioxide is absorbed by the carbon adsorption packing layer 22, the tail gas containing hydrochloric acid gas is discharged from the exhaust port 7 and sent to the subsequent hydrochloric acid gas recovery process.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A tail gas treatment system for vinyl sulfite production, characterized in that: include: The tower body has an exhaust port at the top and a sewage outlet at the bottom; the inner cavity of the tower body is divided into a demisting area at the bottom and a gas washing area at the top by a partition net; A demisting assembly, the demisting assembly is arranged in the demisting area, and includes a primary demisting assembly and a secondary demisting assembly; the primary demisting assembly includes a demisting pipe vertically arranged coaxially with the tower body, the upper end of the demisting pipe is connected to the exhaust gas inlet pipe, and a plurality of baffles are arranged in the demisting pipe along the gas flow direction; the secondary demisting assembly includes a plurality of demisting filler layers spaced apart in the vertical direction between the outer side wall of the demisting pipe and the inner side wall of the tower body; A scrubbing assembly is arranged in the scrubbing area, comprising a columnar grid frame, a carbon adsorption filler layer filled in the columnar grid frame, and a mounting plate arranged along the top outer edge of the columnar grid frame; the outer edge of the mounting plate is in contact with the inner wall of the tower body.

2. The tail gas treatment system in the production of vinyl sulfite according to claim 1, characterized in that: The tower body comprises a tower body, a tower upper cover detachably arranged on the top of the tower body, and a tower lower cover detachably arranged on the bottom of the tower body; The exhaust port is arranged on the upper cover of the tower, and the sewage outlet is arranged on the lower cover of the tower.

3. The tail gas treatment system in the production of vinyl sulfite according to claim 2, characterized in that: The tower body is composed of two detachably connected tower body units; the partition net is located in the upper tower body unit; the upper end of the demister pipe is located in the upper tower body unit, and the lower end extends to the inner cavity of the tower lower cover; the secondary demister assembly is located in the lower tower body unit.

4. The tail gas treatment system in the production of vinyl sulfite according to claim 1, characterized in that: The baffles are arranged obliquely downward, and adjacent baffles are arranged in a staggered manner.

5. The tail gas treatment system in the production of vinyl sulfite according to claim 1, characterized in that: A filter screen is also provided below the secondary defogger assembly; the lower end of the defogger pipe passes through the filter screen and extends to below the filter screen.

6. The tail gas treatment system in the production of vinyl sulfite according to claim 1, characterized in that: A support ring seat is provided on the side wall of the demisting area, and the demisting filler layer is arranged on the support ring seat.

7. The tail gas treatment system in the production of vinyl sulfite according to claim 1, characterized in that: The demisting filling layer includes an outer frame, multi-faceted hollow balls filled in the outer frame, and a mesh cover covering the outer frame; a channel for the demisting pipe to pass through is provided at the center of the demisting filling layer, and an anti-leakage sealing ring is provided between the passing channel and the outer side wall of the demisting pipe.

8. The tail gas treatment system in the production of vinyl sulfite according to claim 1, characterized in that: A mounting ring seat is arranged on the side wall of the gas scrubbing area, and the mounting plate is mounted on the mounting ring seat.

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