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A kind of dimethyl sulfoxide purification method and equipment

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

Active Publication Date: 2016-08-31
福建桦智工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • A kind of dimethyl sulfoxide purification method and equipment
  • A kind of dimethyl sulfoxide purification method and equipment

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 purifying dimethyl sulfoxide, which comprises the steps of: inputting the raw material containing dimethyl sulfoxide into a first evaporator for heating and partially evaporating, and then separating the vapor and liquid; the obtained vapor phase is input into a rectification tower; Phase input second evaporator heating and vapor-liquid separation after partial evaporation, the obtained vapor phase input rectification tower, the gained liquid phase input wiped film evaporator; extract dimethyl sulfoxide crude product at the bottom of the rectification tower, It is input to the third evaporator to be heated and partially evaporated, and then the vapor-liquid is separated, and the obtained liquid phase is input to the wiped film evaporator, and the obtained vapor phase is returned to the rectification column as feed; the third evaporator is heated and partially evaporated, and the vapor-liquid phase is The separated vapor phase is returned to the first evaporator as a heating medium, and at the same time, it is self-condensed to obtain purified dimethyl sulfoxide. The invention can greatly reduce the energy consumption in the recovery process of dimethyl sulfoxide, avoid the clogging problem of solid materials in the rectification tower at the same time, and obtain high-quality and high-recovery dimethyl sulfoxide products.

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 Patents(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