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Method for producing dimethyl disulfide by using methyl mercaptan oxidation method

A technology of dimethyl disulfide and methyl mercaptan, applied in the directions of hydrogenated polysulfide/polysulfide preparation, organic chemistry, etc., can solve the problem of high production cost, life-threatening operator, industrialized production not realized and reported, etc. problems, to achieve the effects of low production costs, significant social and economic benefits, and less emissions from the three wastes

Active Publication Date: 2012-12-12
张怀有 +1
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Problems solved by technology

[0003] At present, dimethyl disulfide is prepared in China by the reaction of dimethyl sulfate and sodium persulfide to generate dimethyl disulfide. The production cost of this process is high (more than 50% higher than the direct oxidation of methyl mercaptan to obtain dimethyl disulfide). 、 The production raw material dimethyl sulfate is highly toxic to the life of the operators, and the waste water and dimethyl sulfide are not easy to deal with
[0004] The direct oxidation of methyl mercaptan to dimethyl disulfide has only been reported in laboratories and theory, and has not been realized and reported in industrial production.

Method used

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  • Method for producing dimethyl disulfide by using methyl mercaptan oxidation method

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Embodiment Construction

[0011] Implementation Method Principle

[0012] Methyl mercaptan reacts under the conditions of oxidizing agent, emulsifier and catalyst at corresponding temperature and pressure to generate dimethyl disulfide. Its chemical reaction mechanism is as follows:

[0013] Reaction Mechanism of Methyl Mercaptan and Oxygen Oxidation

[0014]

[0015] The specific operation steps are as follows:

[0016] The raw material is methyl mercaptan, the oxidant is oxygen, the catalyst is nitrogen dioxide, and the emulsifier is acetone, dimethylformamide or dimethyl sulfoxide.

[0017] Firstly, methyl mercaptan, oxygen, and nitrogen dioxide are passed into the tower reactor at a molar ratio of 4:1.25:0.2, and the oxidation reaction is carried out in the presence of an emulsifier. The molar ratio of methyl mercaptan to emulsifier is 1:10-30 ;The reaction temperature is 10~150℃, the pressure is 0.01~0.1MPa, the reaction yield is 86%~89%, and the conversion rate is 81%~86% (based on the inpu...

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Abstract

The present invention discloses a method for producing dimethyl disulfide by using a methyl mercaptan oxidation method. According to the method, methyl mercaptan, nitrogen dioxide, sulfur trioxide, nitric acid, hydrogen peroxide, oxygen, sulfur, and other oxidizing agents are adopted as raw materials, measures of cooling, stirring, separation, rectification, and the like are performed to obtain the reaction product dimethyl disulfide. According to the present invention, a new approach is provided for the raw materials for preparing the target product, and substantial social benefits and economic effects are provided for reduction of product cost, comprehensive utilization of resources, and reduction of environmental pollution.

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 oxidation. [0002] Background technique [0003] At present, dimethyl disulfide is prepared in China by the reaction of dimethyl sulfate and sodium persulfide to generate dimethyl disulfide. The production cost of this process is high (more than 50% higher than the direct oxidation of methyl mercaptan to obtain dimethyl disulfide). 1. The production raw material dimethyl sulfate is highly poisonous and life-threatening to the operators, and the waste water and dimethyl sulfide are not easy to handle. [0004] The direct oxidation of methyl mercaptan to dimethyl disulfide has only been reported in laboratories and theory, and has not been realized and reported in industrial production. Contents of the invention [0005] The purpose of the presen...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C321/14C07C319/24
Inventor 卢秉刚张怀有
Owner 张怀有
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