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Method for preparing dimethyl disulfide by virtue of methanthiol sulfidization method

A technology of dimethyl disulfide and dimethyl trisulfide, applied in the preparation of hydrogenated polysulfide/polysulfide, organic chemistry, etc., can solve the problems of serious environmental pollution and inability to realize continuous production

Active Publication Date: 2015-05-20
HUBEI XINGFA CHEM GRP CO LTD
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  • Description
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AI Technical Summary

Problems solved by technology

Continuous production cannot be realized in the production process of this method, and a large amount of waste water is generated, which causes serious environmental pollution
At the same time, dimethyl sulfate itself is a highly toxic substance

Method used

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Examples

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Comparison scheme
Effect test

Embodiment 1

[0014] Fill the tower reactor with a solid catalyst, and then fill the tower reactor with a solution containing dimethyl disulfide, dimethyl trisulfide, and dimethyl polysulfide, and keep the catalyst immersed in the solution in the tower . Then continuously add powdered sulfur to the middle or upper part of the tower reactor through a Venturi injector. Continuously feed impure methyl mercaptan gas (60%-99%) from the bottom of the tower reactor. The molar ratio of sulfurized and impure methyl mercaptan gas is 1:1-5, and coils or jackets are added inside the tower reactor, and the coils and jackets at the bottom of the tower are fed into hot water for heat exchange (hot water temperature 60 -90°C), the tower coils and jackets are fed with low-temperature water for heat exchange (low-temperature water temperature 6-8°C). When powder sulfur enters the tower reactor, it will gradually reach a dissolved state. The impure methyl mercaptan fed into the tower bottom is vaporized and...

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Abstract

The invention provides a method for preparing dimethyl disulfide by virtue of a methanthiol sulfidization method. The method comprises the specific steps of filling a tower-type reactor with a solid catalyst and then filling the tower-type reactor with a mixed solution containing dimethyl disulfide, dimethyl trisulfide and dimethyl polysulfide, keeping the solid catalyst to be immersed in the solution inside the tower, spraying powdery sulfur into the solution and continuously introducing impure methanthiol gas from the bottom of the tower-type reactor; enabling the produced hydrogen sulfide gas to return inside a thiol reactor by virtue of the tower top and synthesizing methanthiol from thiol and methanol, extracting a mixture of dimethyl disulfide, dimethyl trisulfide and dimethyl polysulfide, rectifying to obtain dimethyl disulfide, further introducing a mixed solution of byproducts dimethyl trisulfide, dimethyl polysulfide and a small amount of dimethyl disulfide into the tower-type reactor to complete the circular reaction. The conversion rate of sulfur can be not less than 99.0%, the content of bottom product dimethyl polysulfide is 0.5%-1% (in mass percentage) and the purity of dimethyl disulfide by virtue of primary rectification is not more than 99.5%.

Description

technical field [0001] The invention relates to a method for producing dimethyl disulfide with impure methyl mercaptan and sulfur vulcanization method by adopting a solid catalyst. Background technique [0002] At present, the domestic method for producing dimethyl disulfide generally uses the dimethyl sulfate method, which generates dimethyl disulfide by dripping dimethyl sulfate into the sodium persulfide solution to react with it. Continuous production cannot be realized in the production process of this method, and a large amount of waste water is produced, which causes serious environmental pollution. At the same time, dimethyl sulfate itself is a highly toxic substance. In order to solve the deficiencies in the prior art, the present invention proposes a new method for producing dimethyl disulfide. Contents of the invention [0003] A kind of method that methyl mercaptan vulcanization method prepares dimethyl disulfide comprises the steps: [0004] 1) Fill the tow...

Claims

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Application Information

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IPC IPC(8): C07C321/14C07C319/24
Inventor 张怀有田荣华龙真明范鹏刘久清
Owner HUBEI XINGFA CHEM GRP CO LTD
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