New energy-saving process for refining thiofide MBT

Abstract

The invention relates to a new energy-saving process for refining thiofide MBT. The process is characterized by comprising the following steps of: dissolving 40 to 90 percent coarse MBT into 10 percent alkali solution of sodium hydroxide, and performing oxidation for 40 to 50 minutes to obtain M sodium salt; and dripping dilute sulfuric acid with specific gravity of 0.8 to 1.0, oxidizing for 30 minutes, filtering, adding dilute sulfuric acid with specific gravity of 1.1 to 1.3, and performing neutralization to obtain the refined MBT. The process has the advantages that: the purity of the refined MBT reaches over 99 percent, and the refined MBT has high melting point and melting range; and the yield of the MBT is improve by six percent, and 580 yuan per ton of electricity is saved.

Description

technical field [0001] The invention relates to a new energy-saving process for refining rubber vulcanization accelerator MBT, which belongs to the technical field of refining rubber vulcanization accelerators. Background technique [0002] The rubber additives industry is not only a reorganized part of my country's rubber industry, but also an important part of my country's fine chemicals. Accelerator M is an important variety of thiazole accelerators, and it is also a raw material for the production of many downstream accelerators. At present, domestic manufacturers mainly use aniline, carbon disulfide, and sulfur as raw materials to react. From the reaction conditions, it can be divided into high-pressure method and conventional method. The pressure method is divided into acid-base method and solvent method according to the post-treatment. The common disadvantages of both are: a large amount of tail gas H2S produced by the reaction has serious safety hazards, and the rea...

AI Technical Summary

Problems solved by technology

The common disadvantages of both are: a large amount of tail gas H2S produced by the reaction, there are serious safety hazards, and the reaction time is long, the production efficiency is low, the consumption is high, and the pollution of "three wastes" is serious

However, the purity of MBT refined by this method is not high, and toluene has carcinogenic effect, which has an impact on human body and environment

It has been reported that the method for purifying MBT from waste water is to dissolve crude MBT with sodium hydroxide solution, then dilute sulfuric acid to separate out MBT, and wash to obtain refined MBT, but this method has low yield, large energy consumption, and large water consumption.