Dimethyl sulfone preparation method

A technology of dimethyl sulfone and dimethyl sulfoxide, which is applied in the field of preparation of dimethyl sulfone, can solve the problems that the application research of dimethyl sulfone has not been carried out well, and can save separation cost, realize energy saving and consumption reduction, The effect of high conversion rate

Active Publication Date: 2015-11-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In foreign countries, dimethyl sulfone is widely used as a nutritional product that is as important as vitamins. The research on the application of dimethyl sulfone in my country has not yet been carried out well. At present, the products are mainly used for export.

Method used

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preparation example Construction

[0010] The present invention provides a kind of preparation method of dimethyl sulfone, this method comprises in the catalytic distillation reactor that has at least one reaction zone, a kind of liquid mixture is contacted with at least one titanium silicate molecular sieve in the reaction zone, obtains containing A stream of dimethyl sulfone, the liquid mixture comprising dimethyl sulfoxide and at least one oxidizing agent.

[0011] Herein, "at least one kind" means one kind or two or more kinds.

[0012] According to the method of the present invention, the titanium-silicon molecular sieve can be a common titanium-silicon molecular sieve with various topological structures, for example: the titanium-silicon molecular sieve can be selected from titanium-silicon molecular sieves of MFI structure (such as TS-1), MEL Titanium-silicon molecular sieves (such as TS-2), BEA-structured titanium-silicon molecular sieves (such as Ti-Beta), MWW-structured titanium-silicon molecular siev...

preparation example 1

[0078] Under normal pressure (1 standard atmospheric pressure) and 40°C, tetraethyl silicate was added to tetrapropylammonium hydroxide aqueous solution, stirred for 2 hours, and then hollow titanium silicon molecular sieve was added to continue stirring for 1 hour. Among them, the mass ratio of hollow titanium silicon molecular sieve, tetraethyl silicate (calculated as silicon dioxide), tetrapropylammonium hydroxide and water is 100:100:5:120. The obtained mixture was granulated by rolling balls, dried at 120° C. for 5 hours, and calcined at 550° C. for 5 hours to obtain a shaped titanium-silicon molecular sieve with an average particle size of 500 μm.

preparation example 2

[0080] The catalyst is prepared in the same manner as in Preparation Example 1, except that the mass ratio of hollow titanium-silicon molecular sieve, tetraethyl silicate (calculated as silicon dioxide), tetrapropylammonium hydroxide to water is 100:15:10 : 50, and a shaped titanium-silicon molecular sieve with an average particle size of 100 microns was obtained after rolling granulation.

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Abstract

The invention discloses a dimethyl sulfone preparation method. The dimethyl sulfone preparation method comprises causing a liquid mixture to be in contact with at least one titanium silicalite molecular sieve in a reaction zone in a catalytic distillation reactor with at least one reaction zone, so as to obtain material flow containing dimethyl sulfone, wherein the liquid mixture contains dimethyl sulfoxide and at least one oxidizing agent. The method can achieve high dimethyl sulfoxide conversion rate, dimethyl sulfone selectivity and effective utilization rate of the oxidizing agent. Besides, the method can make full use of reaction latent heat and even enables an oxidation product to be separated while the oxidation product reacts with raw material dimethyl sulfoxide, so that the follow-up separation cost is reduced, and energy saving and emission reduction are achieved.

Description

technical field [0001] The invention relates to a preparation method of dimethyl sulfone. Background technique [0002] Dimethyl sulfone is white crystalline powder, easily soluble in water, ethanol, benzene, methanol and acetone, slightly soluble in ether. Potassium permanganate cannot be discolored at room temperature, and strong oxidizing agents can oxidize dimethyl sulfone to methanesulfonic acid. Aqueous solution of dimethyl sulfone is neutral. At 25°C, there is a small amount of sublimation, and the sublimation speed is accelerated at 60°C, so the drying of dimethyl sulfone products should be carried out at low temperature and vacuum. [0003] Dimethyl sulfone is used in industry as a high-temperature solvent and raw material for organic synthesis, as a stationary liquid for gas chromatography, as a analytical reagent, as a food additive, and as a drug. As an organic sulfide, dimethyl sulfone can enhance the ability of the human body to produce insulin, and at the s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C317/04C07C315/02B01J29/89
CPCY02P20/10Y02P20/584
Inventor 史春风林民朱斌
Owner CHINA PETROLEUM & CHEM CORP
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