Device for separating and purifying dimethyl sulfoxide

Abstract

The utility model discloses a device for separating and purifying dimethyl sulfoxide and belongs to the technical field of production and preparation of dimethyl sulfoxide. The dimethyl sulfone crystallization device comprises a crystallization assembly and a filtering assembly, the crystallization assembly comprises a crystallization kettle and a temperature control unit arranged in the crystallization kettle, and the temperature control unit can change the temperature in the crystallization kettle to complete crystallization of dimethyl sulfone; the filtering assembly comprises a filtering tank body, a filtering frame and a stirring pressurizing unit, the filtering tank body is communicated with the crystallization kettle through a valve, the filtering frame is obliquely arranged relative to the filtering tank body, and the filtering frame can separate crystals and push opposite sides of the crystals to gather; the stirring and pressurizing unit comprises a stirring paddle, the stirring paddle is rotationally connected with the filtering tank body and is vertically arranged relative to the filtering frame body, and the stirring paddle can drive liquid to pass through the filtering frame. According to the utility model, crystallized dimethyl sulfone can be separated, and dimethyl sulfoxide can be purified.

Description

Technical Field

[0001] The utility model relates to the technical field of dimethyl sulfoxide production and preparation, in particular to a device for separating and purifying dimethyl sulfoxide. Background Art

[0002] Dimethyl sulfoxide is widely used in fluorochloroaniline, acrylic fiber, aromatic hydrocarbon extraction, external medicine, inositol nicotinate, antioxidant 1010, synthetic berberine, esterification accelerator, Chinese medicine extractant, water-based paint antifreeze, capacitors, tumor treatment, paint stripper, trifluoronitrobenzene, sucrose stearate, chlorofiber, paraffin refining, automobile antifreeze in high-altitude areas, kettle cleaning agent, pesticide synergist, etc.

[0003] One process for synthesizing dimethyl sulfoxide is to first prepare dimethyl sulfide using carbon disulfide and methanol, and then oxidize dimethyl sulfide using hydrogen peroxide to synthesize dimethyl sulfoxide. Usually, an excess of hydrogen peroxide is added to allow the dimethyl sulfide to react completely.

[0004] However, excessive hydrogen peroxide participating in the reaction will generate a by-product, dimethyl sulfone, which dissolves in water and dimethyl sulfoxide, affecting the purity of dimethyl sulfoxide. Utility Model Content

[0005] In view of this, it is necessary to provide a device for separating and purifying dimethyl sulfoxide to solve the problem that dimethyl sulfoxide is doped with by-product dimethyl sulfone.

[0006] The utility model provides a device for separating and purifying dimethyl sulfoxide, comprising:

[0007] A crystallization assembly, comprising a crystallization kettle and a temperature control unit disposed in the crystallization kettle, wherein the temperature control unit is capable of changing the temperature in the crystallization kettle to complete the crystallization of dimethyl sulfone;

[0008] The filter assembly includes a filter tank body, a filter frame and a stirring and pressurizing unit. The filter tank body is connected to the crystallization kettle through a valve. The filter frame is tilted relative to the filter tank body. The filter frame can separate crystals and push the crystals to gather on the opposite side. The stirring and pressurizing unit includes a stirring paddle. The stirring paddle is rotatably connected to the filter tank body and is vertically arranged relative to the filter frame. The stirring paddle can drive the liquid through the filter frame.

[0009] Furthermore, the filter frame includes a grid frame and a filter screen, two sides of the filter screen are respectively in contact with two grid frames, and the grid frame is connected to the filter tank body.

[0010] Furthermore, the grid frame includes an annular outer frame and spokes arranged along the radial direction of the annular outer frame, and both ends of the spokes are respectively connected to the annular outer frame.

[0011] Furthermore, the filter tank body includes a first shell and a second shell arranged opposite to each other, an inclined abutment surface is formed between the first shell and the second shell, and the annular outer frame abuts against the abutment surface; the first shell and the second shell are sealed and connected by a screw-on part to form a filter cavity.

[0012] Furthermore, the stirring paddle includes a rotatable shaft and a blade, the shaft is rotatably connected to the filter tank body, the blade is arranged on the shaft, and the blade can drive the liquid to pass through the filter frame in a forward or reverse direction.

[0013] Furthermore, a sealing cover is provided at the lowest point of the filter tank body relative to the filter frame, and the sealing cover is detachably connected to the filter tank body.

[0014] Furthermore, a hollow annular heat preservation chamber is provided in the crystallization kettle, and the temperature control unit is arranged in the annular heat preservation chamber.

[0015] Furthermore, the temperature control unit includes a heat conducting pipe wound in the annular heat preservation cavity, and a flowing heat conducting medium flows through the heat conducting pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention discloses a device for separating and purifying dimethyl sulfoxide (DMSO), which comprises a filter assembly, a filter tank, a filter frame, and a stirring and pressurizing unit. The filter tank is connected to a crystallization kettle via a valve, and the valve can control the passage of a mixture of DMSO crystals and liquid DMSO into the filter tank. The filter frame is tilted relative to the filter tank, and the filter frame can hinder the passage of DMSO crystals, thereby achieving separation of DMSO and DMSO. DMSO crystals accumulated on one side of the filter frame can be relatively enriched, thereby avoiding clogging of the filter frame and interfering with the separation efficiency of DMSO. The stirring and pressurizing unit comprises a stirring paddle, which is rotatably connected to the filter tank and arranged perpendicularly relative to the filter frame. The stirring paddle can provide negative pressure and accelerate the rate at which DMSO liquid passes through the filter frame. The stirring paddle can also disturb crystals attached to the filter frame, causing the crystals to detach from the filter frame and accumulate on one side of the filter frame, thereby eliminating clogging of the filter frame by the crystals, promoting the filtration and separation of DMSO crystals, and achieving effective purification of DMSO. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the filter assembly in this utility model Figure 1 ;

[0021] Figure 3 This is a schematic diagram of the structure of the filter assembly in this utility model Figure 2 ;

[0022] Figure 4 yes Figure 3 A schematic diagram of the partially enlarged structure of the part A;

[0023] Figure 5 This is a schematic diagram of the connection structure between the first shell and the grid frame in the present invention;

[0024] Figure 6 It is a structural schematic diagram of the crystallization kettle in the utility model.

[0025] In the figure, 100, crystallization assembly; 110, crystallization kettle; 111, annular insulation chamber; 120, temperature control unit; 121, heat pipe;

[0026] 200, filter assembly; 210, filter tank; 211, first shell; 212, second shell; 213, sealing cover; 220, filter frame; 221, grid frame; 221a, annular outer frame; 221b, spokes; 222, filter screen; 230, stirring and pressurizing unit; 231, stirring paddle; 231a, rotating shaft; 231b, paddle. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0028] This embodiment provides a device for separating and purifying dimethyl sulfoxide, which relates to the technical field of dimethyl sulfoxide production and preparation. The obtained dimethyl sulfoxide product is subjected to a cooling crystallization process to crystallize the dimethyl sulfoxide. The obtained product is then filtered using a filter assembly 200 to separate the dimethyl sulfoxide from the dimethyl sulfoxide, thereby purifying the dimethyl sulfoxide.

[0029] See also Figures 1 to 6In this embodiment, a device for separating and purifying dimethyl sulfoxide includes: a crystallization component 100 and a filtration component 200. The crystallization component 100 includes a crystallization kettle 110 and a temperature control unit 120. The temperature control unit 120 is arranged in the crystallization kettle 110. The temperature control unit 120 can cool the internal dimethyl sulfoxide liquid to achieve cooling crystallization of dimethyl sulfoxide and separate the dimethyl sulfoxide dissolved in the dimethyl sulfoxide.

[0030] The filter assembly 200 includes a filter tank body 210, a filter frame 220, and a stirring and pressurizing unit 230. The filter tank body 210 is connected to the crystallization kettle 110 through a valve. The valve can control the mixture of crystalline dimethyl sulfone and liquid dimethyl sulfoxide to enter the filter tank body 210. The filter frame 220 is tilted relative to the filter tank body 210. The filter frame 220 can hinder the passage of crystalline dimethyl sulfone, thereby achieving the separation of dimethyl sulfone and dimethyl sulfoxide. The dimethyl sulfone crystals gathered on one side of the filter frame 220 can be relatively enriched, avoiding clogging of the filter frame 220 and interfering with the separation efficiency of dimethyl sulfoxide. The stirring and pressurizing unit 230 includes a stirring paddle 231, which is rotatably connected to the filter tank body 210 and is vertically arranged relative to the filter frame 220. The stirring paddle 231 can provide negative pressure to accelerate the rate at which dimethyl sulfoxide liquid passes through the filter frame 220. The stirring paddle 231 can also disturb the crystals attached to the filter frame 220, causing the crystals to detach from the filter frame 220 and gather on one side of the filter frame 220, thereby eliminating the blockage of the filter frame 220 by the crystals, promoting the filtration and separation of the crystalline dimethyl sulfoxide, and achieving effective purification of dimethyl sulfoxide.

[0031] In some embodiments, see Figures 1 to 5 The filter frame 220 includes a grid frame 221 and a filter screen 222. The two sides of the filter screen 222 abut against the two grid frames 221. The filter frame 220 can provide effective support for the filter screen 222, completing the fixation and support of each area of ​​the filter screen 222, preventing the filter screen 222 from being subjected to excessive pressure in certain areas, causing deformation and damage to the filter screen 222, thereby ensuring the continuity and efficiency of the filtration process. The grid frame 221 is connected to the filter tank body 210. The connection between the grid frame 221 and the filter tank body 210 provides stable mechanical support, reducing damage to the filter screen 222 caused by uneven pressure or vibration, thereby extending the service life of the filter assembly 200.

[0032] In some embodiments, see Figure 5The mesh frame 221 includes an annular outer frame 221a and spokes 221b. The spokes 221b are arranged radially along the annular outer frame 221a, with both ends of the spokes 221b connected to the annular outer frame 221a. The annular outer frame 221a provides overall support, while the radially arranged spokes 221b increase the internal structural strength, making the entire mesh frame 221 more stable and able to withstand greater liquid pressure and the tension of the filter 222.

[0033] Spokes 221b are arranged radially to evenly distribute the liquid as it flows through filter screen 222, preventing overloading of any one section from affecting overall filtration efficiency. This improves the uniformity and efficiency of the filtration process. Spokes 221b evenly separate filter screen 222, preventing deformation of filter screen 222 due to uneven force during the filtration process, and ensuring that filter screen 222 remains flat and operates effectively.

[0034] The design of the annular outer frame 221a and the spokes 221b optimizes the liquid flow path, reduces the resistance to liquid flow, and makes the filtering process smoother.

[0035] In some embodiments, see Figure 3 and Figure 5 The filter tank body 210 includes a first shell 211 and a second shell 212 arranged relatively to each other. An inclined abutment surface is formed between the first shell 211 and the second shell 212. The inclination angle of the abutment surface is consistent with the inclination angle of the filter frame 220. The filter frame 220 can be adapted to the abutment surface and be fixed between the first shell 211 and the second shell 212 to realize the installation and fixation of the filter frame 220.

[0036] In practice, an annular groove is provided in the end faces of the first and second housings 211, 212. The cross-section of the annular groove is stepped, and the annular outer frame 221a of the filter frame 220 can be inserted into the annular groove, thereby securing and sealing the outer frame and preventing liquid from leaking from the end face between the first and second housings 211, 212. The ends of the first and second housings 211, 212 extend outward, forming an abutment surface on one side. The ends can be connected by bolts, allowing operators to disassemble the first and second housings 211, 212 as needed to complete maintenance and repair of the filter assembly 200.

[0037] In some embodiments, see Figure 3The stirring paddle 231 includes a rotatable shaft 231a and a paddle 231b. The shaft 231a is rotatably connected to the filter tank 210. One end of the shaft 231a is connected to a servo motor, which can control the speed and direction of the shaft 231a. The paddle 231b is disposed at the other end of the shaft 231a. As one method, the paddle 231b can drive the liquid dimethyl sulfoxide and crystals forward through the filter frame 220, providing negative pressure for the movement of the liquid, promoting the liquid to pass through the filter frame 220, and enhancing filtration efficiency.

[0038] As another way, by changing the direction of the rotating shaft 231a, the blade 231b can drive the liquid dimethyl sulfoxide to pass through the filter frame 220 in the reverse direction, reversely clearing the filter frame 220, clearing the crystals attached and blocked in the filter screen 222, and restoring the filtering capacity of the filter screen 222.

[0039] In some embodiments, see Figures 1 to 3 A sealing cap 213 is provided at the lowest point of the filter tank 210 relative to the filter frame 220. The sealing cap 213 is detachably connected to the filter tank 210. The sealing cap 213 is located at the lowest point of the filter frame 220. When the filtration process is completed, the sealing cap 213 can be opened to discharge the dimethyl sulfone crystals accumulated during the filtration process, thereby preventing the accumulation of crystals from affecting subsequent filtration operations.

[0040] The sealing cover 213 is detachably connected to the filter tank body 210. When necessary, the sealing cover 213 can be removed from the filter tank body 210, which makes cleaning the filter tank body 210 more convenient and thorough, and can effectively remove accumulated dimethyl sulfone crystals.

[0041] It should be noted that the sealing cover 213 is connected to the filter tank body 210 by a thread or a buckle, and the sealing cover 213 can be installed and removed as needed. At the same time, a transparent window is provided on the sealing cover 213, through which the working conditions inside the filter tank body 210 can be observed.

[0042] In some embodiments, see Figure 6 A hollow annular insulation chamber 111 is provided in the crystallization kettle 110, and a temperature control unit 120 is provided in the annular insulation chamber 111. The setting of the annular insulation chamber 111 enables the temperature control unit 120 to evenly distribute the cooling capacity, thereby providing a uniform temperature environment inside the crystallization kettle 110, which is conducive to the stable crystallization of dimethyl sulfone and avoids local overheating or overcooling.

[0043] At the same time, the temperature control unit 120 is located in the annular heat preservation chamber 111, and the heat conduction path is short, which can achieve rapid temperature adjustment and improve the temperature control accuracy and response speed during the reaction process.

[0044] As a further embodiment, the temperature control unit 120 includes a heat pipe 121 wound in the annular insulation chamber 111, and a flowing heat-conducting medium is passed through the heat pipe 121. The heat pipe 121 is wound so that heat or cold can be evenly transferred to various parts of the crystallization kettle 110, ensuring uniform temperature distribution in the kettle and avoiding local overheating or overcooling.

[0045] At the same time, the relatively wound heat pipe 121 increases the contact area between the heat pipe 121 and the inner wall of the insulation chamber, ensuring that the heat or cold can fully cover the entire crystallization kettle 110, thereby improving the uniformity and effectiveness of temperature control.

[0046] Efficient heat transfer is achieved through the flowing medium in the heat pipe 121. Compared with the static heating method, the flowing heat-conducting medium can transfer heat more quickly, thereby improving the heating or cooling efficiency.

[0047] The temperature and flow rate of the heat-conducting medium in the heat-conducting pipe 121 can be precisely adjusted, thereby achieving precise control of the temperature in the crystallization kettle 110 to meet the requirements of different crystallization conditions.

[0048] It should be noted that the melting point of dimethyl sulfoxide (DMSO) is 18.5°C and the melting point of dimethyl sulfoxide (MSM) is 109°C. Cooling dimethyl sulfoxide (DMSO) mixed with dimethyl sulfoxide (MSM) to a temperature close to the melting point of dimethyl sulfoxide (DMSO) can promote the crystallization of dimethyl sulfoxide (MSM) and separate it from methyl sulfoxide (DMSO).

[0049] The process begins by introducing a heat transfer medium through heat pipe 121 to cool the liquid in crystallization kettle 110, lowering the temperature in crystallization kettle 110 to between the melting points of dimethyl sulfoxide and dimethyl sulfone. This temperature is then maintained for a period of time to allow all dimethyl sulfone to crystallize. Next, a valve is opened to allow the mixture in crystallization kettle 110 to enter filter tank 210. Filter rack 220 filters the mixture, separating the dimethyl sulfone crystals and purifying the dimethyl sulfoxide.

[0050] The above description is only a preferred specific implementation of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in the present invention should be covered by the present invention.

Claims

1. A device for separating and purifying dimethyl sulfoxide, characterized in that: include: A crystallization assembly, comprising a crystallization kettle and a temperature control unit disposed in the crystallization kettle, wherein the temperature control unit is capable of changing the temperature in the crystallization kettle to complete the crystallization of dimethyl sulfone; The filter assembly includes a filter tank body, a filter frame and a stirring and pressurizing unit. The filter tank body is connected to the crystallization kettle through a valve. The filter frame is tilted relative to the filter tank body. The filter frame can separate crystals and push the crystals to gather on the opposite side. The stirring and pressurizing unit includes a stirring paddle. The stirring paddle is rotatably connected to the filter tank body and is vertically arranged relative to the filter frame. The stirring paddle can drive the liquid through the filter frame.

2. A device for separating and purifying dimethyl sulfoxide according to claim 1, characterized in that, The filter frame includes a grid frame and a filter screen. Two sides of the filter screen are respectively in contact with two grid frames, and the grid frame is connected to the filter tank body.

3. A device for separating and purifying dimethyl sulfoxide according to claim 2, characterized in that, The grid frame includes an annular outer frame and spokes arranged along the radial direction of the annular outer frame, and both ends of the spokes are respectively connected to the annular outer frame.

4. A device for separating and purifying dimethyl sulfoxide according to claim 3, characterized in that, The filter tank body includes a first shell and a second shell arranged opposite to each other, an inclined abutment surface is formed between the first shell and the second shell, and the annular outer frame abuts against the abutment surface; the first shell and the second shell are sealed and connected by a screw-on part to form a filter cavity.

5. A device for separating and purifying dimethyl sulfoxide according to claim 1, characterized in that, The stirring paddle includes a rotatable shaft and a blade. The shaft is rotatably connected to the filter tank body. The blade is arranged on the shaft. The blade can drive the liquid to pass through the filter frame in a forward or reverse direction.

6. A device for separating and purifying dimethyl sulfoxide according to claim 1, characterized in that, A sealing cover is provided at the lowest point of the filter tank body relative to the filter frame, and the sealing cover is detachably connected to the filter tank body.

7. A device for separating and purifying dimethyl sulfoxide according to claim 1, characterized in that: A hollow annular heat preservation chamber is provided in the crystallization kettle, and the temperature control unit is arranged in the annular heat preservation chamber.

8. A device for separating and purifying dimethyl sulfoxide according to claim 7, characterized in that: The temperature control unit includes a heat conduction pipe wound in the annular heat preservation cavity, and a flowing heat conduction medium flows into the heat conduction pipe.

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