Process for preparing dimethyl sulfone

A technology of dimethyl sulfone and dimethyl sulfoxide, which is applied in the field of preparation of dimethyl sulfone, can solve the problems of high cost, odorous products, complicated nitric acid process, etc., and achieves low cost, short production cycle, Easy-to-use effects

Inactive Publication Date: 2003-02-19
徐连成
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention solves the problems that the nitric acid process is complicated, the cost is high, and the product has a strange smell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] The weight ratio of dimethyl sulfoxide and hydrogen peroxide is: 1:0.5, 1150 kg of 40% dimethyl sulfoxide is added to a 3-ton reactor, 836 kg of 27.5% hydrogen peroxide is added, and the temperature is raised to make it react at 90°C for 36 Hours, then lower the temperature below 25°C to precipitate crystals, filter with ordinary filter cloth, centrifugally dehydrate, and dry at 40°C to make the moisture ≤ 0.5% to obtain a finished product with a yield of 75%.

Embodiment 2

[0009] The weight ratio of dimethyl sulfoxide and hydrogen peroxide is: 1:0.6, 260 kg of 30% dimethyl sulfoxide is added to a 1-ton reactor, 234 kg of 20% hydrogen peroxide is added, and the temperature is raised to make it react at 90°C for 30 hours, then lower the temperature at 20°C to precipitate crystals, filter, centrifugally dehydrate, and dry at 30°C to obtain the finished product with a yield of 70.21%.

Embodiment 3

[0011] The weight ratio of dimethyl sulfoxide and hydrogen peroxide is: 1:0.44, 1000 kg of 40% dimethyl sulfoxide is added to a 3-ton reactor, 586 kg of 30% hydrogen peroxide is added, and the temperature is raised to make it react at 130 ° C for 35 hours, then lower the temperature below 25°C to precipitate crystals, filter, centrifugally dehydrate, and dry at 35°C to obtain the finished product with a yield of 69%.

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Abstract

A process for preparing dimethyl sulfone includes the oxidizing reaction between dimethyl sulfoxide and H2O2 in Wt. ratio of 1:(0.44-0.65) at 80-150 deg.C for 4-40 hrs, cooling to educe out crystal, filtering, dewatering and baking. Its advantages are simple process high output rate (65-94%), and no generation of harmful substance and by-product.

Description

(1) Technical field: [0001] The invention relates to a method for preparing organic matter, in particular to a method for preparing dimethyl sulfone. (two) background technology: [0002] At present, dimethyl sulfone can be obtained by oxidizing dimethyl sulfoxide with nitric acid in China. There are many disadvantages in oxidizing dimethyl sulfoxide with nitric acid: high reaction temperature, high energy consumption, and waste of energy; nitrogen oxides, a side reaction product, cannot be completely absorbed, polluting the environment; The finished product can only be obtained by vacuum distillation, the process is complicated, and the product has a strange smell. (3) Contents of the invention: [0003] The invention solves the problems that the process of nitric acid method is complicated, the cost is high, and the product has a strange smell. [0004] The preparation method of the present invention is obtained through oxidation reaction, cooling and precipitation, fil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C315/02C07C317/04
Inventor 张勇
Owner 徐连成
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