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Method and equipment for extracting dimethyl sulfoxide

A technology of dimethyl sulfoxide and a purification method, applied in the field of dimethyl sulfoxide purification, can solve the problems of large equipment investment and energy consumption, and achieve the effects of high recovery rate, avoiding clogging and reducing energy consumption

Active Publication Date: 2014-10-29
福建桦智工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The recovery of dimethyl sulfoxide usually adopts the rectification method. In the existing dimethyl sulfoxide recovery method, the equipment investment and energy consumption are relatively large. Reducing equipment investment while reducing energy consumption is the key to dimethyl sulfoxide recovery. topics worth studying

Method used

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  • Method and equipment for extracting dimethyl sulfoxide
  • Method and equipment for extracting dimethyl sulfoxide

Examples

Experimental program
Comparison scheme
Effect test

no. 2 example

[0067] The raw material containing dimethyl sulfoxide wastewater (wherein the dimethyl sulfoxide content is 35.0%wt) is input into the first evaporator 1 (treatment capacity 15m 3 / h), wherein the vaporization fraction is controlled to be 0.5, the partially evaporated raw material enters the first vapor-liquid separation device 2, the separated vapor phase enters the rectifying tower 5, and the gained liquid phase enters the second evaporator through the first delivery pump p1 3.

[0068] The second evaporator 3 is heated by steam, and the vaporization fraction of this stage is controlled to be 0.93. The partially evaporated raw material enters the second vapor-liquid separation device 4, and the vapor phase obtained by vapor-liquid separation enters the rectification tower 5, and the obtained liquid phase passes through the second vapor-liquid separation device 4. The delivery pump p2 delivers to the wiped film evaporator 10 .

[0069] The operating parameters in the rectifi...

no. 3 example

[0074] The difference between this embodiment and the second embodiment is that the vaporization fraction in the first evaporator 1 is controlled to be 0.4; the vaporization fraction in the third evaporator 8 is controlled to be 0.8.

[0075] The content of dimethyl sulfoxide in the waste water treated in this embodiment is less than 300ppm; the purity of the purified dimethyl sulfoxide product is 99.95%.

no. 4 example

[0077] The difference between this embodiment and the second embodiment is that the vaporization fraction in the first evaporator 1 is controlled to be 0.6; the vaporization fraction in the third evaporator 8 is controlled to be 0.95.

[0078] The content of dimethyl sulfoxide in the waste water treated in this embodiment is less than 300ppm; the purity of the purified dimethyl sulfoxide product is 99.96%.

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Abstract

The invention discloses a method for extracting dimethyl sulfoxide. The method comprises the following steps: inputting a raw material which contains dimethyl sulfoxide into a first evaporator, heating, partially evaporating, then carrying out vapor-liquid separation, and inputting an obtained vapor phase into a rectifying tower; inputting an obtained liquid phase into a second evaporator, heating, partially evaporating, then carrying out the vapor-liquid separation, inputting the obtained vapor phase into the rectifying tower, and inputting an obtained liquid phase into a wiped-film evaporator; extracting a dimethyl sulfoxide crude product from the tower kettle of the rectifying tower, inputting the dimethyl sulfoxide crude product into a third evaporator, heating, partially evaporating, then carrying out vapor-liquid separation, inputting the liquid phase into the wiped-film evaporator, and inputting the obtained vapor phase used as a heating medium back to the first evaporator, and naturally condensing to obtain purified dimethyl sulfoxide. The method disclosed by the invention can be used for greatly reducing the energy consumption in the recovery process of the dimethyl sulfoxide, preventing the problem of blockage of solid materials inside the rectifying tower and obtaining a dimethyl sulfoxide product with high quality and high recovery rate.

Description

technical field [0001] The invention relates to the field of chemical engineering and technology, in particular to a method and equipment for purifying dimethyl sulfoxide. Background technique [0002] Dimethyl Sulfoxide (DMSO) is a sulfur-containing compound with the molecular formula (CH 3 ) 2 SO is a colorless, odorless transparent liquid at room temperature, with a freezing point of 18.45°C and a boiling point of 189°C. It tastes slightly bitter and is easily soluble in water, alcohol, ether, and ester, and has strong hygroscopicity. It is stable below 140°C. It decomposes trace aldehydes, thioethers, and mercaptans when heated for a long time at the boiling point. The decomposition is intensified under acidic conditions and can be inhibited under alkaline conditions. Therefore, DMSO is refined by rectification in vacuum, and the pH value is controlled at about 8, or sodium oxalate stabilizer is added. [0003] Dimethylsulfoxide (DMSO) is an aprotic polar solvent. Be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C315/06C07C317/04
Inventor 翁汉宗钟晓琳郑辉东周云雷
Owner 福建桦智工程技术有限公司
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