Method for treating 2-mercaptobenzothiazole production waste

Abstract

The invention discloses a method for treating 2-mercaptobenzothiazole production waste. The method comprises the steps of: heating the 2-mercaptobenzothiazole production waste to 90-95 DEG C, carrying out solid-liquid separation to obtain solid matter and liquid A, returning the solid matter to an accelerator M workshop, refining and purifying the solid matter to obtain a product accelerator M, distilling and separating the liquid A to obtain a fraction B and a fraction C, cooling residues in a distillation kettle to obtain asphalt-shaped matter D, absorbing hydrogen sulfide gas generated in the distillation separation process by using a sodium hydroxide solution to obtain a sodium hydrosulfide solution, concentrating the sodium hydrosulfide solution to obtain sodium hydrosulfide solids, rectifying and separating the fraction C to obtain aniline and benzothiazole. The method disclosed by the invention is capable of realizing the resourceful treatment of the 2-mercaptobenzothiazole production waste and has the advantages of various by-products, good product quality, simpleness in process flow, easiness in operation, mildness in reaction condition, low production cost and is environment-friendly.

Description

technical field [0001] The invention relates to the technical field of chemical production waste treatment, in particular to a treatment method for 2-mercaptobenzothiazole production waste. Background technique [0002] 2-Mercaptobenzothiazole, the accelerator M, is not only an important vulcanization accelerator in the rubber industry, but also the parent material and intermediate of most other accelerators. After further synthesis and processing, various accelerators can be produced. The output of 2-mercaptobenzothiazole occupies the first place among all kinds of rubber additives. There are hundreds of thousands of tons of output every year in the world, and the domestic conservative calculation will also have an output of 200,000 tons in 2012. [0003] The common production method of accelerator M is the high-pressure method, using carbon disulfide, sulfur, and aniline as raw materials, first mixing carbon disulfide and sulfur at a ratio of 3:1 to make a sulfur-dissolvin...

AI Technical Summary

Problems solved by technology

[0004] The main components of 2-mercaptobenzothiazole production waste are M, toluene, aniline, benzothiazole, etc. Most of these residues cannot be degraded naturally and are dangerous. They are listed as hazardous waste in the environmental protection list. A large amount of M waste residue is dangerous. It pollutes the environment and becomes an environmental protection problem

At present, there are the following methods to deal with the production waste of 2-mercaptobenzothiazole: 1. It is directly used as the bottom waterproof membrane or concrete mold release agent. The disadvantage is that the harmful components have not been treated, and the harmful substances will spread for a long time after the user uses it, polluting the environment. 1. Harmful to human health; 2. Used as boiler burning oil or blast furnace sealing material, this treatment method is actually directly burned, causing pollution to the atmosphere

The most important thing is that the above two treatment methods are simple and low-value utilization of 2-mercaptobenzothiazole production waste, so the current price of 2-mercaptobenzothiazole production waste has not been high, and the highest value in history is also But 1200 yuan / ton