Method for recycling dimethyl sulfoxide waste residue

A technology of dimethyl sulfoxide and waste residue, applied in chemical instruments and methods, organic chemistry, inorganic chemistry, etc., can solve environmental pollution and other problems, achieve the effect of solving the "three wastes" treatment problem, significant economic value and social value

Inactive Publication Date: 2011-04-13
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no practical treatment method for these waste residues, and most of them are discarded, which seriously pollutes the environment. There is no implementation of reclaiming its effective components from waste residues in industrialized production.

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] Take 200g of waste residue, the waste residue contains 40% dimethyl sulfone, add 150-250g of water to the waste residue, heat to 95°C to dissolve and filter, and the filtrate is cooled and crystallized in an ice-water bath at 0 to 5°C to complete a crystallization, and centrifuged Dry separation to obtain 70.0 g of dimethyl sulfone crystals, the content is 91.5%, and the yield is 80.1%;

[0015] Add 30-40g of distilled water to dissolve the obtained crystals. The dissolution temperature is 90-95°C. Cool and recrystallize in an ice-salt bath at -5 to 5°C. Centrifuge and dry to separate. After drying for 2 hours, 57.1 g of dimethyl sulfone product was obtained with a content of 99.8% and a yield of 88.9%.

[0016] The mother liquor separated from the first crystallization is a mixture containing about 88% sodium nitrate and sodium nitrite, which is added to the production of sodium tripolyphosphate as raw materials and catalysts, and the mother liquor separated from the r...

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Abstract

The invention discloses a method for recycling dimethyl sulfoxide waste residue, which comprises the following steps of: diluting the waste residue produced by dimethyl sulfoxide by adding water, heating, dissolving and filtering, cooling and crystallizing the filtrate, and performing centrifugal drying separation to obtain dimethyl sulfone crystal so as to finish first crystallization; and dissolving the crystal by adding water, cooling and re-crystallizing in ice salt bath, performing centrifugal drying separation, drying the obtained crystal in vacuum to obtain a dimethyl sulfone product, and re-crystallizing the separated mother solution for recycling. The method reclaims the dimethyl sulfone product with high quality and high additional value from the dimethyl sulfoxide waste residue, the content of the product reaches 99.8 percent, and the yield reaches 88.9 percent; and the method can effectively utilize sodium nitrate and sodium nitrite in the dimethyl sulfoxide waste residue, and solves the 'three-waste' treatment problem in the dimethyl sulfoxide production.

Description

technical field [0001] The invention belongs to the technical field of dimethyl sulfoxide production, and in particular relates to a new process for recycling waste residue after dimethyl sulfoxide production. Background technique [0002] Using dimethyl sulfide as raw material and nitrogen dioxide as a catalyst to oxidize dimethyl sulfoxide produces a large amount of waste residue, which contains 20-35% sodium nitrate, 30-45% dimethyl sulfone, Waste salt of organic matter such as sodium nitrite below 10%. There is no practical treatment method for these waste residues, and most of them are discarded, which seriously pollutes the environment. It has not been implemented in industrialized production to reclaim its effective components from waste residues. Contents of the invention [0003] The purpose of the present invention is to provide a method for recycling dimethyl sulfoxide waste residue, which can reclaim dimethyl sulfone from the waste residue after dimethyl sulfo...

Claims

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Application Information

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IPC IPC(8): C07C317/04C07C315/06C01B25/41
Inventor胡小静陈晓清
OwnerHUBEI XINGFA CHEM GRP CO LTD