Extraction kettle for extracting and purifying 2-mercapto benzothiazole through solvent process

Abstract

The invention relates to an extraction kettle for extracting and purifying 2-mercapto benzothiazole through the solvent process, which comprises a kettle body (4), wherein a stirring device (3) is arranged at the top of the kettle body (4), an atomizer (2) is arranged at the upper part of the kettle body (4), a filter screen (6) is arranged at the lower part of the kettle body, a mother liquid cavity (9) is formed between the filter screen (6) and the bottom of the kettle, and a mother liquid outlet (7) and a 2-mercapto benzothiazole outlet (8) are arranged at the bottom of the kettle body. A high-temperature liquid state (180-220 DEG C) crude product of the 2-mercapto benzothiazole after synthesis is pressed from a high-pressure kettle to the closed extraction kettle by using nitrogen and atomized into powder in a spray head of the atomizer for directly performing high and low temperature exchange extraction with toluene (normal temperature), thereby improving the solubility of resins in the toluene and further stabilizing the fineness of the 2-mercapto benzothiazole. In addition, the high and low temperature exchange cold extraction technology can not only improve the extraction precision, but also thoroughly solve the explosion problem of a mixture of toluene vapor and air and completely realize the technical renovation which is transferred from the open type manual operation to the closed operation.

Description

technical field [0001] The invention belongs to the technical field of purification of 2-mercaptobenzothiazole, and in particular relates to an extraction kettle for extracting and purifying 2-mercaptobenzothiazole by solvent method. 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 extraction method. Acid-base water washing me...

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Problems solved by technology

However, this process is an open manual operation, and the extraction solvent volatilizes into the air, which has disadvantages such as harsh operating environment and high labor intensity.

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