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Method for extracting 2-mercapto benzothiazole

A mercaptobenzothiazole and extraction technology, applied in the field of extraction technology, can solve the problems of polluted environment, difficult operation, large amount of waste water and the like

Inactive Publication Date: 2005-10-26
苏秋利
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] 2-Mercaptobenzothiazole is a rubber vulcanization accelerator, but the outer surface of 2-mercaptobenzothiazole (M for short) synthesized by high compression has organic impurities, which affects the use effect and needs to be purified. The current There are two purification methods, one is acid-base neutralization method, the other is aniline extraction method, and the purity of the extracted products can meet the requirements of use
However, the former produces a large amount of wastewater and pollutes the environment; the latter is costly and difficult to operate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0005] (1) Put 1 part (by weight) of crystalline particles of 2-mercaptobenzothiazole and 1 part (by weight) of toluene solution into an extraction kettle, and stir for 30 minutes at normal temperature and pressure.

[0006] (2) Put the material in the above-mentioned extraction kettle into the suction filter tank, separate it into filtrate and filter cake through suction filtration, put the filtrate into the distillation kettle, heat up to 80° C. to steam the toluene vapor, and obtain the toluene solution after cooling, Can be recycled.

[0007] (3) Put the filter cake obtained in the process (2) into a double-cone rotary dryer, and dry it for 2 hours at a vacuum of 0.02mpa and 80°C to obtain a qualified 2-mercaptobenzothiazole product.

Embodiment 2

[0009] (1) Put 1 part (by weight) of crystalline particles of 2-mercaptobenzothiazole and 2 parts (by weight) of toluene solution into an extraction kettle, and stir for 30 minutes at normal temperature and pressure.

[0010] (2) Put the material in the above-mentioned extraction kettle into the suction filter tank, separate it into filtrate and filter cake through suction filtration, put the filtrate into the distillation kettle, heat up to 90° C. to steam the toluene vapor, and obtain the toluene solution after cooling, Can be recycled.

[0011] (3) Put the filter cake obtained in the process (2) into a double-cone rotary dryer, and dry it for 2 hours at a vacuum of 0.05mpa and 100°C to obtain a qualified 2-mercaptobenzothiazole product.

Embodiment 3

[0013] (1) Put 1 part (by weight) of crystalline particles of 2-mercaptobenzothiazole and 3 parts (by weight) of toluene solution into an extraction kettle, and stir for 30 minutes at normal temperature and pressure.

[0014] (2) Put the material in the above-mentioned extraction kettle into a suction filter tank, separate it into a filtrate and a filter cake through suction filtration, put the filtrate into a still, heat up to 100° C. to steam out toluene vapor, and obtain a toluene solution after cooling. Can be recycled.

[0015] (3) Put the filter cake obtained in the process (2) into a double-cone rotary dryer, and dry it for 2 hours at a vacuum of 0.08mpa and 120°C to obtain a qualified 2-mercaptobenzothiazole product.

[0016] The amount of toluene solution used is based on the ability to extract the organic impurities on the surface of the 2-mercaptobenzothiazole crystal particles. If the amount is too large, the purity of the product cannot meet the requirements. Gene...

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PUM

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Abstract

The present invention relates to a method for extracting 2-mercaptobenzothiazole, said method includes the following steps: (1). placing 1 (weight) portion of 2-mercaptobenzothiazole and 1-5 (weight) portions of toluene solution into extraction kettle, stirring until the external surface of 2-mercaptobenzothiazole has not impurities; (2) placing the above-mentioned mixed liquor into filter tank to make filtration to obtain filtrate and filter cake; and (3) placing the obtained filter cake into double cone rotating drying machine and drying under the condition of that the degree of vacuum is 0.02-0.08 mpa and temp. is 80-120 deg.C, so that it can obtain the invented qualified 2-mercaptobenzothiozole product.

Description

Technical field: [0001] The invention relates to an extraction process, in particular to an extraction method for purifying 2-mercaptobenzothiazole with toluene. Background technique: [0002] 2-Mercaptobenzothiazole is a rubber vulcanization accelerator, but the outer surface of 2-mercaptobenzothiazole (M for short) synthesized by high compression has organic impurities, which affects the use effect and needs to be purified. The current There are two purification methods, one is acid-base neutralization method, the other is aniline extraction method, and the purity of the extracted products can meet the requirements of use. However, the former produces a large amount of wastewater and pollutes the environment; the latter is costly and difficult to operate. Invention content: [0003] The technical problem to be solved by the present invention is to provide a method for extracting 2-mercaptobenzothiazole, the extracted 2-mercaptobenzothiazole has high purity and low cost....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07D277/72
Inventor 苏秋利
Owner 苏秋利
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