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A kind of method for producing dimethyl sulfoxide

A technology of dimethyl sulfoxide and dimethyl sulfide, which is applied in chemical instruments and methods, preparation of organic compounds, organic chemistry, etc., can solve the problem of increasing the production cost of dimethyl sulfoxide, large dosage, and high oxidant price. problem, to achieve high conversion rate of dimethyl sulfide, improve effective utilization, and good stability.

Active Publication Date: 2016-08-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the peroxide oxidation method, the price of the oxidizing agent is high and the amount used is large, which increases the production cost of dimethyl sulfoxide and limits the application range of the peroxide oxidation method.

Method used

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  • A kind of method for producing dimethyl sulfoxide
  • A kind of method for producing dimethyl sulfoxide
  • A kind of method for producing dimethyl sulfoxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0084] Put 50g of hollow titanium-silicon molecular sieves in methanol solution containing hydrogen peroxide (the content of hydrogen peroxide is 50% by weight), stir to form a slurry, and then inject it into the reaction system through the catalyst feeding port of the reactor. Open the liquid-phase raw material feed valve, and when the back pressure reaches 2.0 MPa, open the dimethyl sulfide feed valve to feed the dimethyl sulfide into the reaction system to continue the reaction. Among them, in the reaction process, based on the total amount of materials in the reactor, the content of the catalyst is 15% by weight; in the liquid phase raw materials in the reactor, the molar ratio of methanol to hydrogen peroxide is 2:1, dimethyl The molar ratio of sulfide to hydrogen peroxide is 2:1, based on dimethyl sulfide, the weight hourly space velocity of the material in the reactor is 1.5h -1 , the temperature in the reaction system was 45° C., and the reaction was continuously perfo...

Embodiment 2

[0090] Dimethyl sulfoxide was produced by the same method as in Example 1, except that the hollow titanium-silicon molecular sieve was replaced by an equivalent amount of titanium-silicon molecular sieve TS-1. Calculate the conversion rate of dimethyl sulfide, the effective utilization rate of oxidant and the selectivity of dimethyl sulfoxide, and the average value of the three sets of data is listed in Table 1.

Embodiment 3

[0092] The same method as in Example 1 was used to produce dimethyl sulfoxide, except that ammonia water was added to the reactor through the auxiliary agent injection port, and the amount of ammonia water added made the pH value of the liquid phase material in the reactor 6.5. Calculate the conversion rate of dimethyl sulfide, the effective utilization rate of oxidant and the selectivity of dimethyl sulfoxide, and the average value of the three sets of data is listed in Table 1.

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Abstract

The invention provides a dimethyl sulfoxide production method. The method comprises the following steps: carrying out a slurry containing dimethyl thioether, titanium silicalite molecular sieve and peroxide under oxidation reaction conditions, sending the obtained reaction mixture to a separator, and carrying out solid-liquid separation, wherein the separator has a first channel and a second channel, and the first channel and the second channel are abutted through a member having a through hole; and sending the reaction mixture into the first channel in order to obtain a liquid phase containing dimethyl sulfoxide from the second channel and residues containing the titanium silicalite molecular sieve at the outlet end of the first channel. The method can effectively improve the efficient utilization rate of an oxidant, the selectivity of dimethyl sulfoxide and the conversion rate of dimethyl thioether, and can efficiently separate the liquid phase containing dimethyl sulfoxide from the liquid-solid mixture obtained through the reaction . The method still realizes high conversion rate of dimethyl thioether, high effective utilization rate of the oxidant and high selectivity of dimethyl sulfoxide even long time operation is carried out.

Description

technical field [0001] The present invention relates to a method for producing dimethyl sulfoxide. Background technique [0002] Dimethyl sulfoxide (DMSO) is a sulfur-containing organic compound. It is a colorless and transparent liquid at room temperature. It has the characteristics of high polarity, high hygroscopicity, flammability and high boiling point aprotic. Dimethyl sulfoxide is soluble in water, ethanol, acetone, ether and chloroform, is a highly polar inert solvent, widely used as a solvent and reaction reagent, for example, as a processing solvent and spinning solvent in acrylonitrile polymerization, as Polyurethane synthesis solvent and spinning solvent, as a synthesis solvent of polyamide, fluorochloroaniline, polyimide and polysulfone. Moreover, dimethyl sulfoxide has high selective extraction ability and can be used as an extraction solvent for the separation of alkanes and aromatic hydrocarbons. For example, dimethyl sulfoxide can be used for the extraction...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C317/04C07C315/02
Inventor 史春风朱斌林民
Owner CHINA PETROLEUM & CHEM CORP