A separation and purification process for organic waste liquid containing DMSO

Abstract

The present invention provides a separation and purification process of a DMSO-containing organic waste liquid, comprising the following steps: S1: conveying the DMSO-containing organic waste liquid to a waste liquid tank through a feeding pump; S2: conveying the DMSO-containing organic waste liquid in the waste liquid tank to a stirring kettle, reducing pressure and heating, and introducing the DMSO-containing organic waste liquid into a composite condenser for condensation treatment after gasification, and recovering DMSO, DMSO / water mixed liquid and water respectively. The separation and purification process of the present invention can obtain DMSO with high purity by reducing pressure and heating combined with a composite condenser for condensation treatment, and can separate most of the water, and can realize continuous separation and purification of the DMSO-containing organic waste liquid. The overall process equipment is simple and easy to operate, and energy consumption can be effectively reduced.

Description

Technical Field

[0001] The invention relates to the technical field of chemical industry, and in particular provides a separation and purification process for organic waste liquid containing DMSO. Background Art

[0002] In modern industrial production and experimental processes, the industrial waste liquid (such as the waste liquid generated in the production process of polyacrylonitrile-based carbon fiber) contains a large amount of DMSO solvent (dimethyl sulfoxide) and a certain amount of water, so it needs specialized treatment technology for treatment and recovery. At present, the separation and purification process of organic waste liquid containing DMSO is mainly adopted by "decompression distillation dehydration + distillation", but the process operation is complicated, the equipment is complex, and it consumes a lot of energy.

[0003] If the organic waste liquid containing DMSO is first subjected to vacuum distillation for dehydration and then subjected to vacuum distillation for recovery of DMSO, the overall process will also require a large amount of energy consumption. Summary of the invention

[0004] Based on this, the present invention provides a separation and purification process for organic waste liquid containing DMSO. By reducing pressure and heating in combination with a composite condenser for condensation treatment, DMSO with higher purity can be obtained, and most of the water can be separated, so that continuous separation and purification of organic waste liquid containing DMSO can be achieved. The overall process equipment is simple and easy to operate, and energy consumption can be effectively reduced.

[0005] In order to achieve the above object, the present invention provides a separation and purification process of DMSO-containing organic waste liquid, comprising the following steps:

[0006] S1: transporting the DMSO-containing organic waste liquid to the waste liquid tank through a feeding pump;

[0007] S2: The DMSO-containing organic waste liquid in the waste liquid tank is transported to a stirring kettle, and heated under reduced pressure. The DMSO-containing organic waste liquid is vaporized and then introduced into a composite condenser for condensation treatment, and DMSO, DMSO / water mixed liquid and water are recovered respectively.

[0008] Preferably, in step S2, the compound condenser comprises a first condensation unit cavity, a second condensation unit cavity, a third condensation unit cavity and a central control unit; a heat exchange tube group is provided in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity, and the heat exchange tube groups in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity are sequentially connected in series and connected to a liquid delivery pump at the liquid inlet end; a condensation tube group is provided in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity, and the condensation tube groups in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity are sequentially connected in series and connected to a gas delivery pump at the gas inlet end, and the gas delivery pump is connected to the stirred tank through a pipeline;

[0009] The central control unit is electrically connected to the liquid delivery pump and the gas delivery pump.

[0010] Preferably, the condensation temperature of the first condensation unit cavity is 60-65°C, the condensation temperature of the second condensation unit cavity is 40-45°C, and the condensation temperature of the third condensation unit cavity is 7-12°C.

[0011] Preferably, the liquid delivery pump drives the heat exchange liquid to flow through the heat exchange tube groups in the third condensation unit cavity, the second condensation unit cavity and the first condensation unit cavity in sequence, and the gas delivery pump drives the gasified gas containing DMSO to flow through the condensation tube groups in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity in sequence, condensing DMSO in the first condensation unit cavity, condensing DMSO / water mixed liquid in the second condensation unit cavity, and condensing water in the third condensation unit cavity.

[0012] Preferably, the first condensation unit cavity, the second condensation unit cavity, and the third condensation unit cavity are all filled with heat transfer liquid, and the condensation tube group in each condensation unit cavity includes a cooling tube, a collecting tank, and a precipitation tube connected in series, the cooling tube is a vertically arranged spiral coil, the precipitation tube is a vertically arranged straight tube and is provided with an inclined fin plate inside, the precipitation tube is arranged on the outside or in the middle of the cooling tube, the collecting tank is connected between the lower ends of the cooling tube and the precipitation tube, and the heat exchange tube group in each condensation unit cavity is located in the middle of the corresponding cooling tube.

[0013] Preferably, the heat exchange tube group located in the first condensation unit cavity includes a first heat exchange tube, the heat exchange tube group located in the second condensation unit cavity includes a second heat exchange tube, and the heat exchange tube group located in the third condensation unit cavity includes a third heat exchange tube; the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube are all U-shaped tubes;

[0014] A third temperature controller is provided at one end of the third heat exchange tube away from the second heat exchange tube, and the heat exchange liquid flows into the third heat exchange tube after the temperature is adjusted by the third temperature controller; a second temperature controller is provided between the second heat exchange tube and the third heat exchange tube, and the heat exchange liquid flows into the second heat exchange tube after the temperature is adjusted by the second temperature controller; a first temperature controller is provided between the first heat exchange tube and the second heat exchange tube, and the heat exchange liquid flows into the first heat exchange tube after the temperature is adjusted by the first temperature controller; the central control unit is electrically connected to the first temperature controller, the second temperature controller and the third temperature controller.

[0015] Preferably, the central control unit is connected to a first temperature sensor for monitoring the temperature of the condensate tube group in the cavity of the first condensation unit, a second temperature sensor for monitoring the temperature of the condensate tube group in the cavity of the second condensation unit, and a third temperature sensor for monitoring the temperature of the condensate tube group in the cavity of the third condensation unit. The central control unit is configured to control the first temperature controller to adjust the temperature according to the temperature monitoring value of the first temperature sensor, control the second temperature controller to adjust the temperature according to the temperature monitoring value of the second temperature sensor, and control the third temperature controller to adjust the temperature according to the temperature monitoring value of the third temperature sensor.

[0016] Preferably, step S2 further comprises the following steps: the obtained DMSO / water mixed solution is returned to the stirring kettle for heating under reduced pressure.

[0017] Preferably, in step S2, the temperature during the reduced pressure heating is 101-106° C., and the vacuum degree is 0.088-0.092 MPa.

[0018] Preferably, the method further comprises the following steps: the DMSO obtained in step S2 is transported to an organic solvent mixing tank for circulation stirring with the pure material, and after the mixing and stirring is completed, it is stored in a finished product tank or filled into a barrel for storage.

[0019] Compared with the prior art, the technical advantages of the separation and purification process of DMSO-containing organic waste liquid provided by the present invention are at least reflected in:

[0020] 1. The separation and purification process of the DMSO-containing organic waste liquid provided by the present invention can obtain DMSO with high purity and can separate most of the water through one-step reduced pressure heating combined with a composite condenser for condensation treatment. At the same time, the obtained DMSO / water mixed liquid can be returned to the stirring tank for reduced pressure heating, which can realize the continuous separation and purification of the DMSO-containing organic waste liquid. The overall process equipment is simple and easy to operate.

[0021] 2. The composite condenser of the present invention is used to separate and purify the DMSO-containing organic waste liquid. The second condensation unit cavity is set between the first condensation unit cavity and the third condensation unit cavity, which can increase the condensation temperature of the first condensation unit cavity, so that the first condensation unit cavity will not condense water, so that the obtained DMSO has high purity, and by reasonably setting the condensation temperature of the second condensation unit cavity, combined with a suitable vacuum degree, the DMSO carried out from the first condensation unit cavity can be fully condensed, only a very small amount of DMSO is introduced into the third condensation unit cavity, and a small amount of water will be condensed at this temperature, and the obtained DMSO / water mixed liquid can be returned to the stirring tank for reduced pressure heating. The amount of DMSO / water mixed liquid produced is not large, so it will not cause a large re-separation burden, and it itself has a certain temperature. After being introduced into the stirring tank, it does not need to increase excessive energy consumption. The remaining water is mainly fully condensed through the third condensation unit cavity, and the organic solvent content in the water is low, which can meet the standard of direct discharge. The use of the composite condenser to separate and purify the DMSO-containing organic waste liquid will not generate additional waste water.

[0022] 3. In the compound condenser, the high-temperature mixed gas flows in the positive direction along the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity in the condensation tube group. In the process of condensing different substances, heat is released outward and the temperature continues to decrease. At the same time, the heat exchange liquid flows in the opposite direction along the third condensation unit cavity, the second condensation unit cavity and the first condensation unit cavity in the heat exchange tube group, absorbing the heat released by the condensation tube group and the temperature continues to increase. The two complement each other and work together to achieve the state of internal energy transfer, effectively use the organic solvent condensation process to release heat, so that the heated heat exchange liquid is used for the previous condensation unit cavity, reducing the control temperature difference of the temperature controller, and has a good energy-saving effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings, which constitute a part of the specification, describe embodiments of the present invention and, together with the specification, are used to explain the principles of the present invention. With reference to the accompanying drawings, the present invention can be more clearly understood according to the following detailed description, in which:

[0024] Figure 1 is a structural schematic diagram of a composite condenser provided in an embodiment of the present invention;

[0025] Figure 2 It is a structural schematic diagram of a composite condenser provided in an embodiment of the present invention, in which part of the shell of each condensation unit cavity is removed;

[0026] Figure 3 is a control system block diagram of a composite condenser provided in an embodiment of the present invention;

[0027] Figure 4It is a schematic diagram of the local structure of the connection between the collecting tank, the cooling pipe and the precipitation pipe.

[0028] Description of the accompanying drawings:

[0029] 1-first condensation unit cavity, 11-first cooling tube, 12-first heat exchange tube, 13-first precipitation tube, 14-first collecting tank, 15-throttle valve, 16-discharge valve;

[0030] 2-second condensation unit cavity, 21-second cooling tube, 22-second heat exchange tube, 23-second precipitation tube, 24-second collection tank;

[0031] 3-third condensation unit cavity, 31-third cooling tube, 32-third heat exchange tube, 33-third precipitation tube, 34-third collection tank;

[0032] 41-liquid delivery pump, 43-third temperature controller, 44-second temperature controller, 45-first temperature controller;

[0033] 51-gas delivery pump;

[0034] 61 - a first temperature sensor, 62 - a second temperature sensor, 63 - a third temperature sensor. DETAILED DESCRIPTION

[0035] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments herein. In the present invention, when a particular device is described as being between a first device and a second device, there may or may not be an intervening device between the particular device and the first device or the second device.

[0036] Embodiment 1:

[0037] A separation and purification process for DMSO-containing organic waste liquid comprises the following steps:

[0038] S1: transporting the DMSO-containing organic waste liquid to the waste liquid tank through a feeding pump;

[0039] S2: The DMSO-containing organic waste liquid in the waste liquid tank is transported to a stirring kettle, and heated under reduced pressure. The DMSO-containing organic waste liquid is vaporized and then introduced into a composite condenser for condensation treatment, and DMSO, DMSO / water mixed liquid and water are recovered respectively.

[0040] The temperature during the reduced pressure heating is 101-106° C., and the vacuum degree is 0.088-0.092 MPa. The obtained DMSO / water mixed solution is returned to the stirring kettle for reduced pressure heating.

[0041] Among them, Figure 1-3 As shown, the composite condenser includes a first condensation unit cavity 1, a second condensation unit cavity 2, a third condensation unit cavity 3 and a central control unit; the first condensation unit cavity 1, the second condensation unit cavity 2, and the third condensation unit cavity 3 are all provided with heat exchange tube groups, and the heat exchange tube groups in the first condensation unit cavity 1, the second condensation unit cavity 2, and the third condensation unit cavity 3 are sequentially connected in series and connected to a liquid delivery pump 41 at the liquid inlet end; the first condensation unit cavity 1, the second condensation unit cavity 2, and the third condensation unit cavity 3 are all provided with condensation tube groups, and the condensation tube groups in the first condensation unit cavity 1, the second condensation unit cavity 2, and the third condensation unit cavity 3 are sequentially connected in series and connected to a gas delivery pump 51 at the air inlet end, and the gas delivery pump 51 is connected to the stirring tank through a pipeline.

[0042] The central control unit is electrically connected to the liquid delivery pump 41 and the gas delivery pump 51 .

[0043] In this embodiment, the first condensation unit cavity 1, the second condensation unit cavity 2, and the third condensation unit cavity 3 are heat-insulated to avoid mutual influence of heat transfer between different condensation unit cavities.

[0044] The condensation temperature of the first condensation unit cavity 1 is 60-65°C, the condensation temperature of the second condensation unit cavity 2 is 40-45°C, and the condensation temperature of the third condensation unit cavity 3 is 7-12°C.

[0045] By arranging different heat exchange tube groups in different condensation unit cavities and connecting the heat exchange tubes in series, it is easy to realize the respective set temperature control of each condensation unit cavity, and further realize that the temperature of different condensation unit cavities reaches the set condensation temperature. By arranging condensation tube groups in each condensation unit cavity, it is possible to realize that different substances are condensed and precipitated in each condensation unit cavity under different temperature conditions.

[0046] The liquid delivery pump 41 is used to drive the heat exchange liquid to flow through the heat exchange tube groups in the third condensation unit cavity 3, the second condensation unit cavity 2 and the first condensation unit cavity 1 in sequence, and the gas delivery pump 51 is used to drive the gas after the gasification of the DMSO-containing organic waste liquid to flow through the condensation tube groups in the first condensation unit cavity 1, the second condensation unit cavity 2 and the third condensation unit cavity 3 in sequence, condensing DMSO in the first condensation unit cavity 1, condensing DMSO / water mixed liquid in the second condensation unit cavity 2, and condensing water in the third condensation unit cavity 3 respectively.

[0047] For the above-mentioned composite condenser, the high-temperature mixed gas flows in the positive direction along the first condensation unit cavity 1, the second condensation unit cavity 2 and the third condensation unit cavity 3 in the condensation tube group, and releases heat outward and the temperature continues to decrease during the condensation of different components; at the same time, the heat exchange liquid flows in the opposite direction along the third condensation unit cavity 3, the second condensation unit cavity 2 and the first condensation unit cavity 1 in the heat exchange tube group, absorbing the heat released by the condensation tube group and the temperature continues to increase. The two complement each other and work together to achieve a stable internal energy state, effectively reducing the waste of heat released in the organic solvent condensation process, and the high-temperature heat exchange liquid finally discharged can be used for other processes, with good energy-saving effect.

[0048] The first condensation unit cavity 1, the second condensation unit cavity 2, and the third condensation unit cavity 3 are all filled with heat transfer fluid, and heat exchange is performed between the heat exchange tube group and the condensation tube group to keep the temperature of the condensation tube group within the set condensation temperature range, which is convenient for controlling the temperature separately.

[0049] The condensate tube group in each condensate unit cavity includes a cooling tube, a collecting tank and a precipitation tube connected in series. Specifically, the first condensate tube group includes a first cooling tube 11, a first collecting tank 14 and a first precipitation tube 13 connected in series; the second condensate tube group includes a second cooling tube 21, a second collecting tank 24 and a second precipitation tube 23 connected in series; the third condensate tube group includes a third cooling tube 31, a third collecting tank 34 and a third precipitation tube 33 connected in series. The above cooling tubes are all vertically arranged spiral coils, the precipitation tube is a vertically arranged straight tube with an inclined fin plate inside, the precipitation tube is arranged outside or in the middle of the cooling tube, the collecting tank is connected between the lower ends of the cooling tube and the precipitation tube, and the heat exchange tube group in each condensate unit cavity is located in the middle of the corresponding cooling tube.

[0050] The collecting tank is connected between the lower ends of the cooling tube and the precipitation tube. By arranging the collecting tank between the vertical cooling tube and the precipitation tube, the liquid DMSO, DMSO / water mixture and water condensed and precipitated in the cooling tube and the precipitation tube all fall into the collecting tank under the action of gravity, thereby realizing the timely collection of liquid components and avoiding the blockage problem caused by the accumulation of liquid components. The collecting tank is connected to the extended outlet tube to timely export the collected liquid components.

[0051] The heat exchange tube group located in the first condensation unit cavity 1 includes a first heat exchange tube 12, the heat exchange tube group located in the second condensation unit cavity 2 includes a second heat exchange tube 22, and the heat exchange tube group located in the third condensation unit cavity 3 includes a third heat exchange tube 32; the first heat exchange tube 12, the second heat exchange tube 22, and the third heat exchange tube 32 are all U-shaped tubes. The U-shaped tube is arranged in the entire height space in the spiral coil, which can increase the contact between the cooling tube and the heat transfer liquid in the condensation unit cavity in a limited space, realize rapid heat exchange, and quickly adjust the temperature of the cooling tube to the temperature required for condensation, so as to condense the gas into liquid. At the same time, the obliquely arranged tooth plate of the precipitation tube improves the precipitation efficiency.

[0052] A third temperature controller 43 is provided at one end of the third heat exchange tube 32 away from the second heat exchange tube 22, and the heat exchange fluid flows into the third heat exchange tube 32 after the temperature is adjusted by the third temperature controller 43; a second temperature controller 44 is provided between the second heat exchange tube 22 and the third heat exchange tube 32, and the heat exchange fluid flows into the second heat exchange tube 22 after the temperature is adjusted by the second temperature controller 44; a first temperature controller 45 is provided between the first heat exchange tube 12 and the second heat exchange tube 22, and the heat exchange fluid flows into the first heat exchange tube 12 after the temperature is adjusted by the first temperature controller 45; the central control unit is electrically connected to the first temperature controller 45, the second temperature controller 44 and the third temperature controller 43.

[0053] Furthermore, the central control unit is connected to a first temperature sensor 61 for monitoring the temperature of the condensate tube group in the first condensation unit cavity 1, a second temperature sensor 62 for monitoring the temperature of the condensate tube group in the second condensation unit cavity 2, and a third temperature sensor 63 for monitoring the temperature of the condensate tube group in the third condensation unit cavity 3. The central control unit is configured to control the first temperature controller 45 to adjust the temperature according to the temperature monitoring value of the first temperature sensor 61, control the second temperature controller 44 to adjust the temperature according to the temperature monitoring value of the second temperature sensor 62, and control the third temperature controller 43 to adjust the temperature according to the temperature monitoring value of the third temperature sensor 63.

[0054] Through the monitoring of each temperature sensor, the central control unit obtains the temperature value of each condensation tube group in real time, and controls the temperature of each temperature regulator accordingly, thereby achieving precise temperature control of each condensation tube group, creating temperature environment conditions for condensation of corresponding substances, and improving the purity of DMSO produced by condensation and the stability of the condensation process.

[0055] The heat exchange liquid flows in the heat exchange tube group and passes through the third condensation unit cavity 3, the second condensation unit cavity 2 and the first condensation unit cavity 1 in sequence; the heat exchange liquid enters the third heat exchange tube 32 after the temperature is adjusted by the third temperature controller 43, and the temperature of the heat transfer liquid in the third condensation unit cavity 3 is adjusted to 7-12°C; the heat exchange liquid enters the second heat exchange tube 22 after the temperature is adjusted by the second temperature controller 44, and the temperature of the heat transfer liquid in the second condensation unit cavity 2 is adjusted to 40-45°C; and the heat exchange liquid enters the first heat exchange tube 12 after the temperature is adjusted by the first temperature controller 45, and the temperature of the heat transfer liquid in the first condensation unit cavity 1 is adjusted to 60-65°C.

[0056] The DMSO obtained in this example is transported to an organic solvent mixing tank for circulation stirring with pure materials, and after the mixing and stirring is completed, it is stored in a finished product tank or filled into a barrel for storage.

[0057] Embodiment 2:

[0058] A separation and purification process for DMSO-containing organic waste liquid, which is different from Example 1, is as follows: Figure 4 As shown, the first cooling pipe 11 is connected to one end of the first collecting tank 14, the first precipitation pipe 13 is connected to the other end of the first collecting tank 14, and a throttle valve 15 is provided at the output end of the first cooling pipe 11, and the cross-sectional area of ​​the first collecting tank 14 is much larger than the cross-sectional area of ​​the valve hole of the throttle valve 15. According to the principle of fluid mechanics, in the heat transfer liquid environment in the first condensation unit cavity 1, the first collecting tank 14 is maintained at a constant temperature, and the gas containing DMSO solvent flows at a high speed through the valve hole of the throttle valve 15, and then enters the first collecting tank 14. The flow speed is instantly reduced and the pressure drops rapidly, thereby creating a constant temperature and reduced pressure condensation precipitation environment in the first collecting tank 14, and it is discharged to the outside through the discharge valve 16. Compared with the single-diameter condensation tube structure of the prior art, the above-mentioned structure provided can effectively increase the speed of DMSO condensing from gas to liquid solvent, reduce the space occupied by the equipment, and improve the DMSO precipitation efficiency.

[0059] Similar to the above-mentioned condensation tube group structure in the first condensation unit cavity 1, the second condensation unit cavity 2 and the third condensation unit cavity 3 also adopt the above-mentioned structure to improve the precipitation efficiency of each corresponding component.

[0060] In addition, in the separation and purification process of the DMSO-containing organic waste liquid of the invention, step S1 generates loading waste gas; in step S2, non-condensable gas is generated during condensation treatment. In addition, when the recovered solvent is subsequently prepared and filled, preparation and filling waste gas is generated. The loading waste gas, non-condensable gas, and preparation and filling waste gas can be collected and collected through pipelines, first recovered by condensation adsorption, and then sequentially introduced into a three-stage spray tower, a dehumidification device, and a zeolite adsorption device for treatment, and the treated waste gas is discharged into the air through the FO-01 exhaust pipe.

[0061] So far, various embodiments of the present disclosure have been described in detail. In order to avoid obscuring the concept of the present disclosure, some details known in the art are not described.

[0062] Based on the above description, those skilled in the art can fully understand how to implement the technical solutions disclosed herein. Although some specific embodiments of the present invention have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration and not for limiting the scope of the present invention. Those skilled in the art should understand that the above embodiments may be modified or some technical features may be replaced by equivalents without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A separation and purification process for DMSO-containing organic waste liquid, characterized in that: The following steps are involved: S1: transporting the DMSO-containing organic waste liquid to the waste liquid tank through a feeding pump; S2: The DMSO-containing organic waste liquid in the waste liquid tank is transported to the stirring kettle, decompressed and heated, and the DMSO-containing organic waste liquid is introduced into the composite condenser for condensation treatment after being vaporized, and DMSO, DMSO / water mixed liquid and water are respectively recovered; wherein, in step S2, the composite condenser comprises a first condensation unit cavity, a second condensation unit cavity, a third condensation unit cavity and a central control unit; a heat exchange tube group is arranged in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity, and the heat exchange tube groups in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity are sequentially connected in series and connected to a liquid delivery pump at the liquid inlet end; a condensation tube group is arranged in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity, and the condensation tube groups in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity are sequentially connected in series and connected to a gas delivery pump at the gas inlet end, and the gas delivery pump is connected to the stirring kettle through a pipeline; The central control unit is electrically connected to the liquid delivery pump and the gas delivery pump; the condensation temperature of the first condensation unit cavity is 60-65°C, the condensation temperature of the second condensation unit cavity is 40-45°C, and the obtained DMSO / water mixed liquid is returned to the stirring kettle for reduced pressure heating, the temperature during reduced pressure heating is 101-106°C, and the vacuum degree is 0.088-0.092MPa; the condensation temperature of the third condensation unit cavity is 7-12°C; The first condensation unit cavity, the second condensation unit cavity, and the third condensation unit cavity are all filled with heat transfer fluid, and the condensation tube group in each condensation unit cavity includes a cooling tube, a collecting tank, and a precipitation tube connected in series. A throttle valve is provided at the output end of the first cooling tube, and the cross-sectional area of ​​the first collecting tank is much larger than the cross-sectional area of ​​the valve hole of the throttle valve. The cooling tube is a vertically arranged spiral coil, and the precipitation tube is a vertically arranged straight tube with an inclined fin plate arranged inside. The precipitation tube is arranged outside or in the middle of the cooling tube, and the collecting tank is connected between the lower ends of the cooling tube and the precipitation tube. The heat exchange tube group in each condensation unit cavity is located in the middle of the corresponding cooling tube; The heat exchange tube group located in the first condensation unit cavity includes a first heat exchange tube, the heat exchange tube group located in the second condensation unit cavity includes a second heat exchange tube, and the heat exchange tube group located in the third condensation unit cavity includes a third heat exchange tube; the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube are all U-shaped tubes; A third temperature controller is provided at one end of the third heat exchange tube away from the second heat exchange tube, and the heat exchange liquid flows into the third heat exchange tube after the temperature is adjusted by the third temperature controller; a second temperature controller is provided between the second heat exchange tube and the third heat exchange tube, and the heat exchange liquid flows into the second heat exchange tube after the temperature is adjusted by the second temperature controller; a first temperature controller is provided between the first heat exchange tube and the second heat exchange tube, and the heat exchange liquid flows into the first heat exchange tube after the temperature is adjusted by the first temperature controller; the central control unit is electrically connected to the first temperature controller, the second temperature controller and the third temperature controller.

2. The separation and purification process according to claim 1, characterized in that: The liquid delivery pump is used to drive the heat exchange liquid to flow through the heat exchange tube groups in the third condensation unit cavity, the second condensation unit cavity and the first condensation unit cavity in sequence, and the gas delivery pump is used to drive the gasified gas containing DMSO to flow through the condensation tube groups in the first condensation unit cavity, the second condensation unit cavity and the third condensation unit cavity in sequence, so as to condense and precipitate DMSO in the first condensation unit cavity, condense and precipitate DMSO / water mixed liquid in the second condensation unit cavity, and condense and precipitate water in the third condensation unit cavity.

3. The separation and purification process according to claim 1, characterized in that: The central control unit is connected to a first temperature sensor for monitoring the temperature of the condensate tube group in the cavity of the first condensation unit, a second temperature sensor for monitoring the temperature of the condensate tube group in the cavity of the second condensation unit, and a third temperature sensor for monitoring the temperature of the condensate tube group in the cavity of the third condensation unit. The central control unit is configured to control the first temperature controller to adjust the temperature according to the temperature monitoring value of the first temperature sensor, control the second temperature controller to adjust the temperature according to the temperature monitoring value of the second temperature sensor, and control the third temperature controller to adjust the temperature according to the temperature monitoring value of the third temperature sensor.

4. The separation and purification process according to any one of claims 1 to 3, characterized in that: The following steps are also included: The DMSO obtained in step S2 is transported to an organic solvent mixing tank for cyclic stirring with the pure material, and after the mixing and stirring is completed, it is stored in a finished product tank or filled into a barrel for storage.

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