Method for co-producing sodium methyl mercaptide and dimethyl sulfide

A technology of dimethyl sulfide and sodium methyl mercaptide, which is applied in the chemical industry, can solve the problems of low conversion rate, difficult post-processing, high reaction temperature, etc., and achieve the effects of simple post-processing, high product yield, and simple operation

Active Publication Date: 2013-03-20
SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the invention provides a method for the co-production of sodium methyl mercaptide and dimethyl sulfide, which solves the problems of high reaction temperature, low conversion rate, difficulty in post-processing, and cost in the prior art. advanced questions

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  • Method for co-producing sodium methyl mercaptide and dimethyl sulfide

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Embodiment 1

[0031] A method for co-producing sodium methyl mercaptide and dimethyl sulfide, its specific steps comprising:

[0032] (1) Reaction stage: add an equal amount of 175Kg of sodium hydrosulfide solution with a mass fraction of 32% into four identical reactors to form a series connection. 60.6Kg of gas is passed into four reactors in turn to obtain pure methyl mercaptan gas;

[0033] (2) Absorption stage: add an equal amount of 296Kg of sodium hydroxide solution with a mass fraction of 13.5% into three identical absorption kettles, and the methyl mercaptan gas generated in step (1) is absorbed and saturated by sodium hydroxide solution in three stages After, can obtain massfraction and be 20.37% sodium methyl mercaptide solution 321Kg, yield 88.2%;

[0034] (3) Treatment stage: the reaction solution obtained in step (1) was introduced into a stratifier and allowed to stand still, and the oily liquid in the upper layer was taken to obtain a 9Kg dimethyl sulfide solution with a yi...

Embodiment 2

[0036] A method for co-producing sodium methyl mercaptide and dimethyl sulfide, its specific steps comprising:

[0037] (1) Reaction stage: add an equal amount of 124Kg of sodium hydrosulfide solution with a mass fraction of 45% into four identical reactors to form a series connection, at a pressure of -0.01Mpa and a temperature of 0°C, the Gas 75.7Kg is passed into four reactors in turn to obtain pure methyl mercaptan gas;

[0038](2) Absorption stage: add an equal amount of 267Kg of sodium hydroxide solution with a mass fraction of 15% into three identical absorption kettles, and the methyl mercaptan gas generated in step (1) is absorbed and saturated by sodium hydroxide solution in three stages After that, can obtain massfraction and be 289Kg of sodium methyl mercaptide solution 21.34%, yield 87.9%;

[0039] (3) Treatment stage: the reaction solution obtained in step (1) was introduced into a stratifier and left to stand, and the oily liquid in the upper layer was taken to...

Embodiment 3

[0041] A method for co-producing sodium methyl mercaptide and dimethyl sulfide, its specific steps comprising:

[0042] (1) Reaction stage: add an equal amount of 28% sodium hydrosulfide solution 200Kg into four identical reactors to form a series connection, at a pressure of -0.015Mpa and a temperature of 15°C The gas 141.4Kg is passed into four reactors in sequence to obtain pure methyl mercaptan gas;

[0043] (2) Absorption stage: add an equal amount of 14% sodium hydroxide solution 800Kg into three identical absorption kettles, and the methyl mercaptan gas generated in step (1) is absorbed and saturated by the sodium hydroxide solution in three stages After, can obtain massfraction and be 20.56% sodium methyl mercaptide solution 840Kg, yield 88.3%;

[0044] (3) Treatment stage: the reaction solution obtained in step (1) was introduced into a stratifier and left to stand, and the upper layer of oily liquid was taken to obtain 18Kg of dimethyl sulfide solution with a yield ...

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Abstract

The invention relates to a method for co-producing sodium methyl mercaptide and dimethyl sulfide, which essentially comprises the following steps of: under a negative pressure condition, filling methane chloride gas into a sodium hydrosulfide solution; implementing a four-stage cascade reaction, absorbing by a sodium hydroxide solution to obtain a sodium methyl mercaptide solution; and making the reaction liquid obtained from the four-stage cascade reaction standing and layering to obtain the dimethyl sulfide. The method for co-producing the sodium methyl mercaptide and the dimethyl sulfide is low in toxicity of the adopted raw materials, short in reaction duration, moderate in required reaction condition, simple in operation, high in product yield and simple in post-treatment; and the method can be massively adopted in the industrial production, and has a great economic value.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for co-producing sodium methyl mercaptide and dimethyl sulfide. Background technique [0002] Sodium methyl mercaptide can be used as a raw material for pesticides, medicines, and dye intermediates, and as an antidote for hydrogen sulfide poisoning. [0003] At present, the domestic production process of sodium methyl mercaptide mainly uses sodium hydrosulfide and dimethyl sulfate as raw materials, generates methyl mercaptan gas at 70 °C, and then absorbs it with lye multistage countercurrent to generate 20% sodium methyl mercaptide product . Wherein dimethyl sulfate belongs to highly toxic compound, is volatile, has bigger potential safety hazard, and when reacting with dimethyl sulfate, temperature is higher, conversion rate is only 80%, and the yield of final sodium methyl mercaptide is only 75% %, and the generated methyl mercaptan gas contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C321/04C07C321/14C07C319/02C07C319/14
Inventor 闫峰吴文雷门振高洪奎史庆苓马韵升
Owner SHANDONG EFIRM BIOCHEMISTRY & ENVIRONMENTAL PROTECTION CO LTD
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