Method for recycling dimethyl sulfone and sodium nitrate from dimethyl sulfoxide waste slag

A technology of dimethyl sulfoxide and dimethyl sulfone, which is applied in the field of recycling dimethyl sulfone and sodium nitrate, can solve the problems of low utilization rate of waste residue, pollution of the environment, and waste of usable materials, so as to reduce pollution and reduce emissions , the effect of small energy consumption

Active Publication Date: 2008-06-11
HUBEI XINGFA CHEM GRP CO LTD
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Problems solved by technology

At present, the utilization rate of these waste residues is low, and most of them are di

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[0009] A method for reclaiming dimethyl sulfone and sodium nitrate from dimethyl sulfoxide waste residue, it may further comprise the steps:

[0010] a. Separation of dimethyl sulfone and nitrate: place the dimethyl sulfoxide waste residue in a vacuum reaction kettle at 120°C-160°C for vacuum distillation, and the dimethyl sulfoxide in the dimethyl sulfoxide waste residue and dimethyl sulfone are distilled out, introduced into another kettle for cooling to obtain crystallized solids, and the residue in the reaction kettle mainly contains sodium nitrate and sodium nitrite;

[0011] b. Refining of dimethyl sulfone: adding sufficient amount of hydrogen peroxide to oxidize the dimethyl sulfone and dimethyl sulfoxide distilled in step a, and then vacuum drying to obtain the dimethyl sulfone product;

[0012] C. Refining of sodium nitrate: discharge after the residue in step a is dissolved in water, filter to obtain the mother liquor containing sodium nitrate and sodium nitrite, the...

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Abstract

The invention relates to a method for recovering dimethyl sulfone and sodium nitrate from dimethyl sulfoxide waste slag, which comprises arranging waste slag waste slag in a decompression autoclave at 120-160DEG C to decompress and distill, distilling out the dimethyl sulfoxide and dimethyl sulfone from dimethyl sulfoxide waste slag to be arranged into an another autoclave to be cooled to obtain crystallized solid, arranging the distilled dimethyl sulfoxide and dimethyl sulfone into enough hydrogen dioxide solution to be oxidized and dried in vacuum to obtain dimethyl sulfone product, dissolving leavings in water to be discharged, adding concentrated nitric acid into the filtered mother liquid to adjust pH till 2-3 and convert sodium nitrite to sodium nitrate, neutralizing over nitric acid via soda, to neutralize the mother liquid, heating the solution to 120-125DEG C, evaporating at normal pressure, cooling to 50-70DEG C, crystallizing, separating and drying to obtain sodium nitrate product. The invention can reduce discharge of industrial waste slag and reduce environment pollution, with simple process and low energy consumption.

Description

technical field [0001] The invention relates to a method for producing dimethyl sulfone and sodium nitrate, in particular to a method for recovering dimethyl sulfone and sodium nitrate from dimethyl sulfoxide waste residue. Background technique [0002] When dimethyl sulfoxide is produced by nitrogen dioxide oxidation, a large amount of nitrogen oxides are generated. After being absorbed by sodium hydroxide solution, waste salt containing a large amount of organic matter such as sodium nitrate, sodium nitrite, dimethyl sulfone and a small amount of ether is generated. After testing, the contents of various substances in the waste salt are: 30-45% of dimethyl sulfone, 20-35% of sodium nitrate, and less than 10% of sodium nitrite, of which sodium nitrite can be converted into sodium nitrate. At present, the utilization rate of these waste residues is low, and most of them are discarded, which not only pollutes the environment, but also wastes the usabl...

Claims

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Application Information

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IPC IPC(8): C07C315/06C07C317/04C01D9/16
Inventor 盛美娥胡小静张永萍李小琼张淼余有平袁兵
Owner HUBEI XINGFA CHEM GRP CO LTD
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