Totally enclosed clean production system for rubber vulcanization accelerator 2-mercaptobenzothiazole

Abstract

A totally enclosed clean production system for rubber vulcanization accelerator 2-mercaptobenzothiazole, includes a high-pressure synthesis system (1), a crude product purification system (2) and an exhaust gas processing system (3), the crude product purification system comprises an extraction autoclave (4), 2-mercaptobenzothiazole crude product is directly pumped from a high-pressure synthesis autoclave (17) into the extraction autoclave (4), the extraction autoclave (4) has a 2-mercaptobenzothiazole outlet connected to a drying machine and a mother liquor outlet connected to a mother liquor storage tank (8), the mother liquor storage tank (8) is connected to a rectification column (9), the top of the rectification column (9) is connected to a toluene storage tank (11), recovered toluene is connected to the extraction autoclave (4) via a toluene metering tank (5), and the bottom discharge port of the rectification column (9) is connected to a resin storage tank (10). The invention overcomes the environment pollution and hazard of the operator caused by exposed cooling and exposed leaching, overcomes the drawbacks of extraction and drying by artificial feeding and discharge, fully realizes enclosed discharge, enclosed extraction, and enclosed filtration and drying, and realizes fully enclosed leak-free continuous production without organic gas emission.

Description

technical field [0001] The invention belongs to the technical field of production of rubber vulcanization accelerator 2-mercaptobenzothiazole, and in particular relates to a fully enclosed clean production system of rubber vulcanization accelerator 2-mercaptobenzothiazole. Background technique [0002] The rubber vulcanization accelerator 2-mercaptobenzothiazole (MBT) is a general-purpose accelerator widely used in the rubber industry. raw material. High-content MBT is also the main raw material for the production of cephalosporin antibiotics. However, MBT synthesized under high pressure has low purity and contains various impurities (collectively referred to as resins), so it cannot be used directly. Therefore, the refining and purification process of MBT has become a very important step in its production. At present, there are two production methods of the domestic rubber vulcanization accelerator MBT: one is the acid-base washing method; the other is the solvent extrac...

AI Technical Summary

Problems solved by technology

[0006] It can be seen that the existing solvent extraction and purification process of 2-mercaptobenzothiazole is an open manual operation, and the extraction solvent volatilizes into the air, which has the disadvantages of harsh operating environment and high labor intensity.

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