Preparation method of rubber promoter 2-mercaptobenzothiazole

A technology of rubber accelerator and benzothiazole, applied in the field of rubber accelerator preparation, can solve the problems of waste gas hydrogen sulfide environmental pollution, no recovery of benzothiazole, low production efficiency, etc., so as to reduce pollution, reduce production cost, reduce waste gas The effect of low emissions

Inactive Publication Date: 2015-05-06
QINGDAO WANGYU RUBBER
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  • Abstract
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AI Technical Summary

Problems solved by technology

At present, the commonly used method in industrial production is the aniline method, but its waste gas hydrogen sulfide causes serious environmental pollution, high recovery cost, low production efficiency, no recovery of by-product benzothiazole, and low product purity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0016] 1. Put nitrobenzene into the high-pressure reactor, feed hydrogen sulfide gas, react to generate aniline, and recover hydrogen sulfide gas;

[0017] 2. Add carbon sulfide and sulfur, react for 5-8 hours at a temperature of 200°C-280°C and a pressure of 5.0-8.0MPa, add sodium hydroxide solution to dissolve, and discard the insoluble matter;

[0018] 3. The solution is extracted and separated with an organic solvent, and the aqueous phase is acidified to precipitate 2-mercaptobenzothiazole, filtered and dried.

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PUM

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Abstract

The invention discloses a preparation method of rubber promoter 2-mercaptobenzothiazole. The preparation method comprises following steps: step 1, nitrobenzene is delivered into a high-pressure reaction kettle, hydrogen sulfide is added, aniline is obtained via reaction, and hydrogen sulfide is recycled; step 2, carbon disulfide and sulphur are added, reaction is carried out at 200 to 280 DEG C, under 5.0 to 8.0MPa for 5 to 8h, sodium hydroxide solution is added for dissolving, and insoluble substances are removed; and step 3, an obtained solution is subjected to extraction and separation with an organic solvent, an acid is added into an obtained water phase for acidification precipitation of 2-mercaptobenzothiazole, and obtained 2-mercaptobenzothiazole is subjected to filtering and drying. According to the preparation method of rubber promoter 2-mercaptobenzothiazole, nitrobenzene is used for replacing aniline so as to reduce production cost, intermediate products and by-products can be recycled, direct conversion of finished products can be realized, product yield is increased, technology conditions are relatively mild, industrialization can be easily realized, exhaust emission of production processes is less, and environmental pollution is minimized.

Description

[0001] technical field [0002] The invention relates to a preparation method of a rubber accelerator, in particular to a preparation method of 2-mercaptobenzothiazole. [0003] Background technique [0004] 2-Mercaptobenzothiazole has the characteristics of fast vulcanization acceleration, low vulcanization flatness, and no early vulcanization during mixing. It is widely used in the rubber processing industry and is an essential high-efficiency rubber vulcanization accelerator for natural rubber and synthetic rubber. agent. At present, the commonly used method in industrial production is the aniline method, but its waste gas hydrogen sulfide causes serious environmental pollution, high recovery cost, low production efficiency, no recovery of by-product benzothiazole, and low product purity. [0005] Contents of the invention [0006] The object of the present invention is to provide a preparation method of rubber accelerator 2-mercaptobenzothiazole, which has simple pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D277/72
CPCC07D277/72
Inventor 梁松杰
Owner QINGDAO WANGYU RUBBER
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