CN115611784A - Method for removing nitrogen dioxide in dimethyl sulfoxide - Google Patents
Method for removing nitrogen dioxide in dimethyl sulfoxide Download PDFInfo
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- CN115611784A CN115611784A CN202211146381.5A CN202211146381A CN115611784A CN 115611784 A CN115611784 A CN 115611784A CN 202211146381 A CN202211146381 A CN 202211146381A CN 115611784 A CN115611784 A CN 115611784A
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- nitrogen dioxide
- dimethyl sulfoxide
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- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 title claims abstract description 132
- JCXJVPUVTGWSNB-UHFFFAOYSA-N nitrogen dioxide Inorganic materials O=[N]=O JCXJVPUVTGWSNB-UHFFFAOYSA-N 0.000 title claims abstract description 74
- MGWGWNFMUOTEHG-UHFFFAOYSA-N 4-(3,5-dimethylphenyl)-1,3-thiazol-2-amine Chemical compound CC1=CC(C)=CC(C=2N=C(N)SC=2)=C1 MGWGWNFMUOTEHG-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 239000011259 mixed solution Substances 0.000 claims abstract description 11
- 239000007789 gas Substances 0.000 claims abstract description 9
- 238000007872 degassing Methods 0.000 claims abstract description 8
- HHVIBTZHLRERCL-UHFFFAOYSA-N sulfonyldimethane Chemical compound CS(C)(=O)=O HHVIBTZHLRERCL-UHFFFAOYSA-N 0.000 abstract description 18
- 238000007086 side reaction Methods 0.000 abstract description 2
- QMMFVYPAHWMCMS-UHFFFAOYSA-N Dimethyl sulfide Chemical compound CSC QMMFVYPAHWMCMS-UHFFFAOYSA-N 0.000 description 9
- VWDWKYIASSYTQR-UHFFFAOYSA-N sodium nitrate Chemical compound [Na+].[O-][N+]([O-])=O VWDWKYIASSYTQR-UHFFFAOYSA-N 0.000 description 9
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 239000003153 chemical reaction reagent Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 4
- 150000003839 salts Chemical class 0.000 description 4
- 235000010344 sodium nitrate Nutrition 0.000 description 4
- 239000004317 sodium nitrate Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000001704 evaporation Methods 0.000 description 2
- 230000008020 evaporation Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000575 pesticide Substances 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- ZSLUVFAKFWKJRC-IGMARMGPSA-N 232Th Chemical compound [232Th] ZSLUVFAKFWKJRC-IGMARMGPSA-N 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910052776 Thorium Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- XOCUXOWLYLLJLV-UHFFFAOYSA-N [O].[S] Chemical group [O].[S] XOCUXOWLYLLJLV-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 150000004696 coordination complex Chemical class 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012847 fine chemical Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910021645 metal ion Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- -1 organic synthesis Substances 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000003495 polar organic solvent Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012453 solvate Substances 0.000 description 1
- JFALSRSLKYAFGM-UHFFFAOYSA-N uranium(0) Chemical compound [U] JFALSRSLKYAFGM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C315/00—Preparation of sulfones; Preparation of sulfoxides
- C07C315/06—Separation; Purification; Stabilisation; Use of additives
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The invention belongs to the technical field of separating nitrogen dioxide from dimethyl sulfoxide, and particularly relates to a method for removing nitrogen dioxide from dimethyl sulfoxide, which comprises the steps that a mixed solution of nitrogen dioxide and dimethyl sulfoxide continuously enters a degassing tower device from the top of a nitrogen dioxide removing tower, and the gas of the nitrogen dioxide is continuously removed from the top of the tower; a method for separating dimethyl sulfoxide liquid continuously removed from the bottom of a tower. The nitrogen dioxide dissolved in dimethyl sulfoxide is continuously removed in a special removing tower device. The temperature of the removing tower is controlled by a heat exchange facility in the removing tower, so that the potential safety hazard is reduced, and the side reaction of dimethyl sulfoxide generated into dimethyl sulfone is reduced.
Description
Technical Field
The invention belongs to the technical field of separating nitrogen dioxide from dimethyl sulfoxide, and particularly relates to a method for removing nitrogen dioxide from dimethyl sulfoxide.
Background
Dimethyl sulfoxide is a typical fine chemical product. Is an important intermediate in the fields of electronics, carbon fiber, medicine, pesticide, organic synthesis and the like, and has wide application. Dimethyl sulfoxide is a high-efficiency organic solvent and a new extracting agent developed in the 60's of the 20 th century, and the molecule of the dimethyl sulfoxide contains a semipolar sulfur-oxygen group which can effectively generate a coordination complex or a solvate with metal ions. Therefore, the dimethyl sulfoxide can extract noble metals such as gold, silver, platinum and the like in hydrochloric acid and sulfuric acid media, and can also extract rare earth elements such as uranium, thorium and the like. More expensive, it is a polar organic solvent, and has the characteristics of good solubility and strong permeability for organic matters and inorganic matters. Therefore, the method has wide application in the fields of electronics, carbon fiber, medicine, pesticide, organic synthesis, precious metal extraction and the like.
In the preparation process of the dimethyl sulfoxide, nitrogen dioxide is used as an oxidizing agent, pure oxygen is used, and dimethyl sulfide is used as a raw material. In this method, nitrogen dioxide is largely dissolved in dimethyl sulfoxide during the oxidation of dimethyl sulfide to dimethyl sulfoxide. In the traditional nitrogen dioxide removal process, alkali is added into a dimethyl sulfoxide mixed solution for neutralization to generate sodium nitrate waste salt. And then removing sodium nitrate waste salt by evaporation in the dimethyl sulfoxide rectification process. The potential safety hazard is large in the evaporation and desalination process; many safety accidents occur at home and abroad, and a large amount of waste salt containing dimethyl sulfoxide and sodium nitrate is discharged. Therefore, the development of a new method which is safe and efficient and has no three-waste discharge has important significance in the aspects of safety and environmental influence.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for removing nitrogen dioxide in dimethyl sulfoxide, solving the potential safety hazard and avoiding the emission of nitrogen oxide tail gas.
The present invention has been accomplished in such a manner that,
a method for removing nitrogen dioxide in dimethyl sulfoxide comprises continuously introducing mixed solution of nitrogen dioxide and dimethyl sulfoxide into a degassing tower from the top of a nitrogen dioxide removing tower, and continuously removing nitrogen dioxide gas from the top of the tower; a method for separating dimethyl sulfoxide liquid continuously removed from the bottom of a tower.
Further, the removal conditions were pressure: 0.0MPa to 0.3MPa, temperature: 15 to 180 ℃.
Further, the temperature of the removal system is as follows: 20-120 ℃ and the pressure is as follows: 0.0MPa to 0.2MPa.
Further, the flow rate of the mixed liquid entering the removing tower is 0.01 to 10.0t/h; the mass ratio of the correspondingly treated nitrogen dioxide in the dimethyl sulfoxide is 1 to 40 percent.
Further, the removing tower equipment is a plate tower, the length-diameter ratio range (1-20) of the removing tower is 1, the removing tower comprises a plurality of trays arranged along the vertical direction and a riser arranged on the axial direction of the removing tower, nitrogen dioxide and dimethyl sulfoxide are separated in the trays, and the separated nitrogen dioxide is discharged from the riser of the tower to the top of the tower.
Compared with the prior art, the invention has the beneficial effects that:
1. the nitrogen dioxide dissolved in dimethyl sulfoxide is continuously removed in a special removing tower device. The temperature of the removing tower is controlled by a heat exchange facility in the removing tower, so that the potential safety hazard is reduced, and the side reaction of dimethyl sulfoxide generated into dimethyl sulfone is reduced.
2. The separation products of the invention are dimethyl sulfoxide and nitrogen dioxide. The nitrogen dioxide is reused in the oxidation of dimethyl sulfide, and the separated dimethyl sulfoxide is directly rectified by dimethyl sulfoxide. Compared with the prior art, the method of the invention does not produce nitrogen oxide tail gas emission; a large amount of sodium nitrate waste salt containing organic matters generated in the separation process of dimethyl sulfoxide and nitrogen dioxide is avoided; and the potential safety hazard caused by separating the waste sodium nitrate salt.
3. The removing tower is a removing tower device with a large length-diameter ratio. The position where the dimethyl sulfoxide mixed solution containing nitrogen dioxide is introduced is positioned at the top of the removal tower, and the removed nitrogen dioxide gas is continuously discharged from the top of the tower through a riser; the dimethyl sulfoxide freed from nitrogen dioxide gas is discharged continuously from the bottom of the column via a downcomer. Avoid the nitrogen dioxide to contact with dimethyl sulfoxide again, be favorable to nitrogen dioxide to take off can carry out in succession, be favorable to extensive, continuous industrial production.
4. By controlling the temperature, pressure, liquid level and mixed liquid feeding quantity of the removing system. So that the removal process is always kept in a continuous and stable production state. And the separated product nitrogen dioxide can be reused without emission. The nitrogen dioxide removal rate is achieved: more than 80 percent.
Drawings
FIG. 1 is a process diagram of a method provided by the method of the present invention;
FIG. 2 is a schematic structural diagram of a part of tower segment of a desulfurizing tower used in the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the invention provides a method for removing nitrogen dioxide from dimethyl sulfoxide, which comprises that in a degassing tower device, a mixed solution of nitrogen dioxide and dimethyl sulfoxide continuously enters from the top of a nitrogen dioxide removing tower, and the gas of nitrogen dioxide is continuously removed from the top of the tower; a method for separating dimethyl sulfoxide liquid continuously removed from the bottom of a tower. The removal conditions were pressure: 0.0MPa to 0.3MPa, temperature: 15 to 180 ℃. Preferably, the removal system temperature is: 20-120 ℃ and the pressure is as follows: 0.0MPa to 0.2MPa.
The flow rate of the mixed liquid entering the removing tower is 0.01 to 10.0t/h; the mass ratio of the correspondingly treated nitrogen dioxide in the dimethyl sulfoxide is 1 to 40 percent.
Referring to fig. 2, the removing tower is a plate tower, the length-diameter ratio range (1-20) of the removing tower is 1, the removing tower comprises a plurality of trays arranged along the vertical direction and a riser 1 arranged on the axial direction of the removing tower, nitrogen dioxide and dimethyl sulfoxide are separated in the trays 3, and the separated nitrogen dioxide is discharged from the riser 2 of the tower to the top of the tower. The desorption tower is provided with a heat exchange tube and jacket heating device 2, and is provided with temperature measuring, pressure measuring, liquid level and other devices.
The invention is characterized in that the pressure: 0.0MPa to 0.3MPa, temperature: continuously degassing in a degassing tower with large length-diameter ratio under the degassing condition of 15-120 ℃. The nitrogen dioxide gas removed in the process is reused, and the dimethyl sulfoxide from which the nitrogen dioxide is removed is subjected to rectification treatment. The continuous feeding and discharging are realized by controlling the temperature, pressure and liquid level of the removing system. The nitrogen dioxide removal rate reaches more than 80 percent. The invention provides a method for continuously, efficiently, safely and environmentally removing nitrogen dioxide dissolved in dimethyl sulfoxide.
The nitrogen dioxide mixed solution dissolved in the dimethyl sulfoxide is continuously introduced into a degassing tower (shown in a tower section diagram) with a large length-diameter ratio, under the pressure and temperature conditions limited by the invention, the nitrogen dioxide and the dimethyl sulfoxide are separated in a tower tray, and the separated nitrogen dioxide is discharged from a riser of the tower to the top of the tower; the separated dimethyl sulfoxide is continuously discharged from the bottom of the tower by a downcomer tray; the liquid level of the tower bottom is controlled to obtain the method for continuously removing the nitrogen dioxide in the dimethyl sulfoxide.
(1) The reaction mechanism of the present invention:
controlling the reaction temperature and pressure to prevent the dimethyl sulfoxide from being oxidized into dimethyl sulfone
C2H6SO+NO2→C2H6SO2+NO
(2) The nitrogen dioxide removal rate of the invention is defined as follows:
removal rate = (mass of nitrogen dioxide in dimethyl sulfoxide removed/mass of nitrogen dioxide in dimethyl sulfoxide before removal) × 100%.
(3) By combining the method and the attached drawing, the mixed solution with the dimethyl sulfoxide mass concentration of 50-90% is prepared in the removing tower by taking dimethyl sulfoxide and nitrogen dioxide as media. The mass concentration of dimethyl sulfoxide is more preferably 70 to 90%.
(4) The invention removes the pressure: 0.0MPa to 0.3MPa, temperature: 15 to 180 ℃; the temperature of the removal system is more preferably 20 to 120 ℃.
(5) The mixed solution of dimethyl sulfoxide and nitrogen dioxide is diffused from the top of the removal tower to each tray. In order to increase the residence time of the trays in the mixed liquid, the adjustment is carried out according to the height of the removal tower and the number of the trays. The feed rate of the mixed liquor is adjusted. And selecting the optimal scheme of the height of the removal tower and the number of the trays, wherein the optimal scheme is that the height of the tower is 6 meters and the number of the trays is 10.
(6) The temperature, pressure, liquid level and mixed liquid feeding quantity of the removing system are controlled. In the mixed liquid separation stage, the separated nitrogen dioxide and the dimethyl sulfoxide are always kept not to be contacted, and the dimethyl sulfoxide as an oxidation product does not participate in the oxidation reaction any more. Pressure of mixed solution added into the stripping tower: 0.0 to 0.3MPa, more preferably 0.0 to 0.2MPa.
(7) The separation of dimethyl sulfoxide and nitrogen dioxide is rapidly carried out on the mixed solution with different concentrations under the action of temperature, pressure and each tray. The separation time for destroying the solubility is 0.01s to 100s.
Examples
Example 1, 100mL/min flow rate into the stripping column. Keeping the removal temperature at 50 deg.C and the pressure at 0.05MPa, and continuously removing for 30min. Detection and calculation: the removal rate of nitrogen dioxide is 76.5 percent, and the generation rate of dimethyl sulfone is 0.1 percent.
Example 2, the mixed reagent of dimethyl sulfoxide and nitrogen dioxide in this example (mass ratio: 5:1): the obtained product enters a stripping tower at the flow rate of 100 mL/min. Keeping the removal temperature at 50 deg.C and the pressure at 0.02MPa, and continuously removing for 30min. Detection and calculation: the nitrogen dioxide removal rate is 79.1 percent, and the dimethyl sulfone generation rate is 0.08 percent.
Example 3, the mixed reagent of dimethyl sulfoxide and nitrogen dioxide in this example (mass ratio: 5:1): the obtained product enters a stripping tower at the flow rate of 100 mL/min. Keeping the removal temperature at 80 deg.C and the pressure at 0.05MPa, and continuously removing for 30min. Detection and calculation: the nitrogen dioxide removal rate is 85.2 percent, and the dimethyl sulfone generation rate is 0.15 percent.
Example 4, the mixed reagent of dimethyl sulfoxide and nitrogen dioxide in this example (mass ratio: 5:1): the effluent enters the stripping column at a flow rate of 100 mL/min. Keeping the removal temperature at 80 deg.C and the pressure at 0.02MPa, and continuously removing for 30min. Detection and calculation: the nitrogen dioxide removal rate is 93.4 percent, and the dimethyl sulfone generation rate is 0.12 percent.
Example 5, the mixed reagent of dimethyl sulfoxide and nitrogen dioxide in this example (mass ratio: 5:1): the effluent enters the stripping column at a flow rate of 100 mL/min. Keeping the removal temperature at 120 deg.C and the pressure at 0.05MPa, and continuously removing for 30min. Detection and calculation: the nitrogen dioxide removal rate is 95.2 percent, and the dimethyl sulfone generation rate is 0.21 percent.
Example 6, the mixed reagent of dimethyl sulfoxide and nitrogen dioxide (mass ratio: 5:1) in this example: the effluent enters the stripping column at a flow rate of 100 mL/min. Keeping the removal temperature at 120 deg.C and the pressure at 0.02MPa, and continuously removing for 30min. Detection and calculation: the nitrogen dioxide removal rate is 96.6 percent, and the dimethyl sulfone generation rate is 0.16 percent.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (5)
1. A method for removing nitrogen dioxide in dimethyl sulfoxide is characterized in that the method comprises the steps that in a degassing tower device, a mixed solution of nitrogen dioxide and dimethyl sulfoxide continuously enters from the top of a nitrogen dioxide removing tower, and the gas of the nitrogen dioxide is continuously removed from the top of the tower; a method for separating dimethyl sulfoxide liquid continuously removed from the bottom of a tower.
2. The method of claim 1. It is characterized in that the removing conditions are pressure: 0.0MPa to 0.3MPa, temperature: 15 to 180 ℃.
3. The method of claim 3. The method is characterized in that the temperature of a removing system is as follows: 20-120 ℃, and the pressure is as follows: 0.0MPa to 0.2MPa.
4. The method according to claim 2, wherein the flow rate of the mixed liquid into the stripping column is 0.01 to 10.0t/h; the mass ratio of the correspondingly treated nitrogen dioxide in the dimethyl sulfoxide is 1 to 40 percent.
5. The method of claim 1, wherein the stripping column apparatus is a tray column, the length-to-diameter ratio of the stripping column is in the range of (1-20): 1, and comprises a plurality of trays arranged in the vertical direction and a riser arranged in the axial direction of the stripping column, the nitrogen dioxide and the dimethyl sulfoxide are separated in the trays, and the separated nitrogen dioxide is discharged from the riser of the column to the top of the column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211146381.5A CN115611784A (en) | 2022-09-20 | 2022-09-20 | Method for removing nitrogen dioxide in dimethyl sulfoxide |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211146381.5A CN115611784A (en) | 2022-09-20 | 2022-09-20 | Method for removing nitrogen dioxide in dimethyl sulfoxide |
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| CN115611784A true CN115611784A (en) | 2023-01-17 |
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| CN202211146381.5A Pending CN115611784A (en) | 2022-09-20 | 2022-09-20 | Method for removing nitrogen dioxide in dimethyl sulfoxide |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6414193B1 (en) * | 1999-01-29 | 2002-07-02 | Toray Fine Chemicals Co., Ltd. | Process for producing dimethyl sulfoxide |
| CN216537715U (en) * | 2021-11-24 | 2022-05-17 | 新疆兴发化工有限公司 | Nitrogen oxide tail gas degassing device |
| CN216537711U (en) * | 2021-11-01 | 2022-05-17 | 新疆兴发化工有限公司 | Oxidation tail gas absorbs environmental protection processing apparatus who makes acid |
-
2022
- 2022-09-20 CN CN202211146381.5A patent/CN115611784A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6414193B1 (en) * | 1999-01-29 | 2002-07-02 | Toray Fine Chemicals Co., Ltd. | Process for producing dimethyl sulfoxide |
| CN216537711U (en) * | 2021-11-01 | 2022-05-17 | 新疆兴发化工有限公司 | Oxidation tail gas absorbs environmental protection processing apparatus who makes acid |
| CN216537715U (en) * | 2021-11-24 | 2022-05-17 | 新疆兴发化工有限公司 | Nitrogen oxide tail gas degassing device |
Non-Patent Citations (3)
| Title |
|---|
| 凌立新，蒋山泉，鲁凌作: "化工单元实训操作", 30 November 2020, 重庆大学出版社, pages: 318 - 319 * |
| 王维周: "化学工程基础", 31 August 2005, pages: 242 * |
| 田锡义: "液相乳化法生产二甲基亚矾的工艺研究", 辽宁化工, no. 3, pages 1 - 4 * |
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