Multi-stage sleeve washing and impurity removal method for rubber vulcanization accelerator tbbs

Abstract

The invention discloses a method for multistage washing impurity removal of a rubber vulcanizing accelerator TBBS. The method comprises the following steps: filtering a TBBS reaction solution to obtain a TBBS crude product and a mother solution, and putting the mother solution into a high-concentration mother solution tank for later use; cleaning the TBBS crude product by using a third-stage mother solution, filtering, and putting the cleaning solution into the high-concentration mother solution tank for later use; cleaning an obtained filter cake by using a second-stage mother solution, filtering, and putting the cleaning solution into a third-stage mother solution tank for later use; cleaning the obtained filter cake by using a first-stage mother solution, filtering, and putting the cleaning solution into a second-stage mother solution tank for later use; and cleaning the obtained filter cake by using clean water until the pH value is equal to 8, filtering, blow-drying the filter cake to obtain a TBBS pure product, and putting the cleaning solution into a first-stage mother solution tank for later use. According to the method disclosed by the invention, multiple stages of mother solutions with different impurity contents are adopted to clean the TBBS crude product, and finally the TBBS crude product is cleaned by using the clean water to obtain the pure product, so that the used amount of the clean water is greatly reduced, the TBBS powder in the mother solutions is recovered, the discharge amounts of wastewater and solid wastes are reduced, and an environmental protection requirement is met.

Description

technical field [0001] The invention relates to a method for washing crude vulcanized rubber vulcanization accelerator TBBS, in particular to a washing method which adopts multi-stage sleeve washing to remove impurities in the crude product and produces less waste water, and belongs to the technical field of rubber vulcanization accelerator TBBS. Background technique [0002] Rubber vulcanization accelerator TBBS (chemical name is N-tert-butyl-2-benzothiazole sulfenamide, molecular formula is C 11 h 14 N 2 S 2 ) is a late-acting rubber vulcanization accelerator commonly used at home and abroad, which can significantly improve the physical properties and aging resistance of rubber products. It has excellent scorching resistance, safe processing, short vulcanization time, slight discoloration, and no frosting. Vulcanized rubber is resistant to aging, has good tensile strength and constant elongation, and is suitable for all kinds of rubber. It is mainly used to manufacture ...

AI Technical Summary

Problems solved by technology

Accelerator TBBS crude product consumes a lot of primary water (clear water) in the washing process, and inevitably produces a lot of waste water, which increases the cost of environmental protection treatment

In addition, after extracting TBBS, a large amount of mother liquor is produced. Since the accelerator TBBS has a certain solubility in tert-butylamine, the mother liquor also contains accelerator TBBS fine powder suspended in the liquid phase through the press filter cloth. loss, which affects the product yield and increases the production cost; at the same time, the excess tert-butylamine is extracted from the mother liquor by rectification for reuse. Since the rectification operation is carried out at a temperature exceeding 100°C, the accelerator TBBS will be depleted at this temperature. It decomposes to form resinous impurities with complex components and becomes solid waste, which not only increases the cost of environmental protection treatment, but also consumes a lot of energy and affects the environment. It does not meet the requirements of national environmental protection policies.