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Method for synthesizing and producing dimethyl disulfide from methyl mercaptan and dimethyl sulfoxide

A technology of dimethyl sulfoxide and dimethyl disulfide, which is applied in the field of preparation of dimethyl disulfide, can solve the problem that waste water and dimethyl sulfide are not handled well, and dimethyl disulfide has no industrialized production and production. The problems of high toxicity of raw material dimethyl sulfate, etc., are beneficial to large-scale industrial production, low production cost, significant social and economic benefits.

Inactive Publication Date: 2014-07-09
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, dimethyl disulfide is prepared in China by the reaction of dimethyl sulfate and sodium disulfide to generate dimethyl disulfide. This process has high production costs, and the production raw material dimethyl sulfate is highly toxic. Thioether is not easy to handle
[0003] Using methyl mercaptan and dimethyl sulfoxide to synthesize dimethyl disulfide, there are no domestic and foreign related literature reports and industrial production reports

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1: Methyl mercaptan and dimethyl sulfoxide are passed into the reactor with a molar ratio of 2:0.95, and the synthesis reaction is carried out in the presence of an alumina catalyst. The reaction temperature is 250 ° C, the reaction pressure is 0.3 MPa, and the reaction product is di Methyl disulfide, dimethyl sulfide, water, and the reaction products are condensed and cooled, and then separated by standing to obtain the crude product dimethyl disulfide, and then the qualified dimethyl disulfide product is obtained through rectification.

Embodiment 2

[0018] Example 2: Methyl mercaptan and dimethyl sulfoxide are passed into the reactor with a molar ratio of 2:1.05, and the synthesis reaction is carried out in the presence of an alumina catalyst. The reaction temperature is 290 ° C, the reaction pressure is 0.25 MPa, and the reaction product is di Methyl disulfide, dimethyl sulfide, water, and the reaction products are condensed and cooled, and then separated by standing to obtain the crude product dimethyl disulfide, and then the qualified dimethyl disulfide product is obtained through rectification.

Embodiment 3

[0019] Example 3: Methyl mercaptan and dimethyl sulfoxide are passed into the reactor with a molar ratio of 2:1.1, and the synthesis reaction is carried out in the presence of an alumina catalyst. The reaction temperature is 290 ° C, the reaction pressure is 0.18 MPa, and the reaction product is di Methyl disulfide, dimethyl sulfide, water, and the reaction products are condensed and cooled, and then separated by standing to obtain the crude product dimethyl disulfide, and then the qualified dimethyl disulfide product is obtained through rectification.

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Abstract

A method for synthesizing and producing dimethyl disulfide from methyl mercaptan and dimethyl sulfoxide comprises the following steps: introducing methyl mercaptan and dimethyl sulfoxide according to a molar ratio of 2:0.95-1.55 into a reactor, in the presence of an aluminium oxide catalyst, performing synthetic reaction to obtain reaction products dimethyl disulfide, dimethyl sulfide and water, performing condensation, cooling and standing separation on the reaction products to obtain a crude product dimethyl disulfide, and performing rectification to obtain a qualified dimethyl disulfide finished product. The methyl mercaptan synthetic process is employed for obtaining dimethyl disulfide, and the method is simple in production process, low in production cost, beneficial for large-scale industrialized production and less in produced ''three wastes (waste gas, waste water and industrial residue)'' discharge, and has substantial social benefic and economic benefit.

Description

technical field [0001] The invention relates to a preparation method of dimethyl disulfide, in particular to a preparation method of using methyl mercaptan as a raw material to obtain the target product dimethyl disulfide through a synthesis method. Background technique [0002] At present, dimethyl disulfide is prepared in China by the reaction of dimethyl sulfate and sodium disulfide to generate dimethyl disulfide. This process has high production costs, and the production raw material dimethyl sulfate is highly toxic. Thioether is not easy to handle. [0003] Dimethyl disulfide is synthesized by methyl mercaptan and dimethyl sulfoxide without any relevant domestic and foreign literature reports and industrial production reports. Contents of the invention [0004] The object of the present invention is to provide a method for producing dimethyl disulfide from methyl mercaptan, which is directly synthesized by methyl mercaptan to obtain dimethyl disulfide, the production...

Claims

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Application Information

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IPC IPC(8): C07C321/14C07C319/24
Inventor 李国璋舒龙王杰田荣华龙真明田云清杨军
Owner HUBEI XINGFA CHEM GRP CO LTD
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