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Production method for dimethyl disulfide

A technology of dimethyl disulfide and production method, which is applied in the direction of hydrogenated polysulfide/polysulfide preparation, organic chemistry, etc., can solve the problems of high industrialization cost, increased cost, and poor control, and achieve reaction safety Smooth, increase production cost, avoid the effect of explosion risk

Active Publication Date: 2016-09-07
NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

This reaction is carried out under alkaline conditions, avoiding the oxidation of methyl mercaptan to methanesulfonic acid, liquid-liquid reaction, and relatively low operating conditions, but there are: (1) hydrogen peroxide has strong oxidation ability, and the oxidation reaction is too intense, so it is not Good control; (2) Since the technology uses dilute hydrogen peroxide, the concentration of lye is getting lower and lower, which needs to be concentrated, and the cost increases, and the cost of hydrogen peroxide used is also high, and its industrialization cost is too high; (3) Product yield But only about 70-80%

Method used

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  • Production method for dimethyl disulfide

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Embodiment 1

[0029] A kind of production method of dimethyl disulfide, it specifically carries out according to the following steps:

[0030] (1) Liquid alkali absorption

[0031] Methyl mercaptan is gasified directly through the primary static mixer, and undergoes absorption reaction with excess sodium hydroxide solution, and the unabsorbed methyl mercaptan gas undergoes absorption reaction with excess sodium hydroxide solution again through the secondary static mixer; Wherein, the reaction temperature is 52°C, the mass percentage concentration of the sodium hydroxide solution is 18%, the feed temperature is 52.6°C, and the excess of sodium hydroxide is 3% in terms of molar percentage;

[0032] In the sodium methyl mercaptide product obtained by the reaction of this step, in terms of mass percentage, it contains 20% sodium methyl mercaptide, 3% sodium hydroxide, the balance is water, and trace other impurities, and the formazan it generates The yield of sodium thiolate is as high as 100%...

Embodiment 2

[0037] A kind of production method of dimethyl disulfide, it specifically carries out according to the following steps:

[0038] (1) Liquid alkali absorption

[0039]Methyl mercaptan is gasified directly through the primary static mixer, and undergoes absorption reaction with excess potassium hydroxide solution, and the unabsorbed methyl mercaptan gas undergoes absorption reaction again with excess potassium hydroxide solution through the secondary static mixer; Wherein, the reaction temperature is 55°C, the mass percent concentration of the potassium hydroxide solution is 17.5%, the feed temperature is 55.0°C, and the excess of potassium hydroxide is 5% in terms of molar percentage;

[0040] In the potassium methyl mercaptide product obtained by the reaction of this step, in terms of mass percentage, it contains 23% potassium methyl mercaptide, 3.5% potassium hydroxide, the balance is water, and trace impurities, and the methyl mercaptan it generates The yield of potassium i...

Embodiment 3

[0045] A kind of production method of dimethyl disulfide, it specifically carries out according to the following steps:

[0046] (1) Liquid alkali absorption

[0047] Methyl mercaptan is gasified directly through the primary static mixer, and undergoes absorption reaction with excess potassium hydroxide solution, and the unabsorbed methyl mercaptan gas undergoes absorption reaction again with excess potassium hydroxide solution through the secondary static mixer; Wherein, the reaction temperature is 60°C, the mass percent concentration of the potassium hydroxide solution is 17.0%, the feed temperature is 59.5°C, and the excess of potassium hydroxide is 5.5% in terms of molar percentage;

[0048] In the potassium methyl mercaptide product obtained through the reaction of this step, in terms of mass percentage, it contains potassium methyl mercaptide 19%, potassium hydroxide 2.5%, the remainder is water, and other impurities in trace amounts, and the formazan it generates The y...

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Abstract

The invention relates to a production method for dimethyl disulfide. The production method comprises the following steps: subjecting methyl mercaptan and strong base to reaction so as to generate methanthiol salt, and subjecting methanthiol salt and oxygen-containing gas to oxidation reaction so as to prepare dimethyl disulfide. The method provided by the invention combines a caustic soda liquid absorption method and an oxidation method to realize preparation of dimethyl disulfide, and has the advantages of small explosive range, basically no by-product, high product purity, high yield, etc.

Description

technical field [0001] The present invention relates to the production of dimethyl disulfide, in particular to a production method of dimethyl disulfide. Background technique [0002] At present, there are many ways to synthesize dimethyl disulfide (DMDS), mainly including dimethyl sulfate method, methyl mercaptan oxidation method, methyl mercaptan sulfur method, methyl mercaptan hydrogen sulfide sulfur method and sodium methyl mercaptan hydrogen peroxide method . [0003] Dimethyl sulfate method, sodium sulfide and sulfur are used as raw materials to prepare sodium disulfide, and then the newly prepared sodium disulfide is reacted with dimethyl sulfate to prepare dimethyl disulfide. The technology of dimethyl sulfate method is mature, but the raw material dimethyl sulfate is highly toxic, the environment is seriously polluted, and the raw material consumption quota is relatively high, so it is gradually eliminated. [0004] Methyl mercaptan oxidation method: use methyl me...

Claims

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Application Information

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IPC IPC(8): C07C319/24C07C321/14
CPCC07C319/24C07C321/14
Inventor 柳亚玲陈孝建姚如杰郑道敏
Owner NINGXIA UNISPLENDOUR TIANHUA METHIONINE CO LTD
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