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Production method and apparatus of dimethyl disulfide

A technology for the production of dimethyl disulfide, which is applied in the field of preparation of dimethyl disulfide, can solve the problems of low investment costs, and achieve the effects of low consumption, stable production process, and reduced labor intensity

Active Publication Date: 2015-11-25
CHENGDU DEMEI ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has simple equipment and relatively low investment costs, but the by-product hydrogen sulfide needs to be treated with special equipment

Method used

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  • Production method and apparatus of dimethyl disulfide
  • Production method and apparatus of dimethyl disulfide
  • Production method and apparatus of dimethyl disulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] The first step is to make a packed reaction tower with DN100×3000 steel pipe and DN150×3000 jacket steel pipe, as well as material inlet and outlet pipes, flange pressure gauges, and thermometers. This reaction tower can be used for the absorption of methyl mercaptan , can also be used as the oxidation of sodium methyl mercaptide;

[0059] The second step, preparation of alkali solution: first prepare 10-20% sodium hydroxide solution, then add 100-200ppm of catalyst, and put it into the reaction tower;

[0060] The 3rd step, pass into methyl mercaptan to reaction tower, after absorbing certain hour, stop passing through methyl mercaptan, analyze the concentration of sodium methyl mercaptide in the assay agent lye;

[0061] In the fourth step, hot water is passed into the jacket layer of the reaction tower, and when the temperature reaches the set temperature of the test, the hot water is stopped. Feed 50% (mol) oxygen-enriched air into the reaction tower or increase th...

Embodiment 2

[0066] It is an industrial scale-up verification test. Since there is no ready-made methyl mercaptan gas during the industrial scale-up verification test, the raw material gas of methyl mercaptan is prepared by adding dilute sulfuric acid from an outsourced sodium methyl mercaptide solution, and is temporarily replaced by two neutralization tanks with stirring.

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Abstract

The invention relates to the technical field of preparation of dimethyl disulfide and provides a production method of dimethyl disulfide. The production method includes the steps of A, using sodium hydroxide solution containing catalyst to absorb a methyl mercaptan mixture so as to obtain mixed solution containing sodium thiomethoxide; B, mixing oxygen or oxygen-rich air with the alkaline solution obtained in the step A, allowing reaction to generate dimethyl disulfide, dimethyl sulfide and sodium hydroxide; and C, separating the oxygen or oxygen-rich air surplus in the reaction to generate dimethyl sulfide so as to obtain dimethyl disulfide liquid. The production method has low cost, high yield and low pollution. A production apparatus of dimethyl disulfide is further provided; the production apparatus comprises an absorption column, a heater, an oxidization column, a flash separator tank and a recovery system connected in order through a pipeline, wherein the heater is used for heating the alkaline solution to a set temperature, the oxidization column is used for generating dimethyl disulfide, the flash separator tank is used for separating materials, and the recovery system is used for recovering the alkaline solution. The production apparatus is automatically controllable, thus labor is saved, reutilization of the alkaline solution is achieved and production cost is lowered.

Description

technical field [0001] The invention relates to the technical field of preparation of dimethyl disulfide, in particular to a production method and device of dimethyl disulfide. Background technique [0002] Dimethyl disulfide is an important chemical product with a wide range of uses. It is mainly used as an intermediate for the preparation of pesticides and insecticides; in the petroleum industry, it can be used as an anti-corrosion and coking agent for ethane cracking furnaces, oil Vulcanizing agent for product hydrofining catalyst, inhibitor of hydrocracking in benzene nuclei dehydroxylation reaction; in rubber industry, it can be used as solvent, regeneration agent, softener and plasticizer; in addition, dimethyl disulfide is also It can be used as fuel, lubricating additive and inhibitor of some organic chemical reactions. [0003] At present, there are four production methods of dimethyl disulfide: dimethyl sulfate method, methyl mercaptan oxidation method, methanol v...

Claims

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Application Information

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IPC IPC(8): C07C319/24C07C319/28C07C321/14
Inventor 郭克雄郭毛晓春黄云霞黄飞
Owner CHENGDU DEMEI ENG TECH
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