Reaction device for continuous synthesis of 2-mercaptobenzothiazole

Abstract

The invention discloses a reaction device for continuous synthesis of 2-mercaptobenzothiazole. The reaction device comprises a raw material preheater, a micromixer, multistage reaction kettles and a stripping tower which are connected in series and sequentially complete the preheating, mixing, reacting and phase separating processes of raw materials; the raw materials comprise aniline, carbon disulfide and sulphur which are heated to the respective initial temperatures in the preheating device and then are subjected to insulation mixing in the micromixer, a raw material mixture sequentially enters from the bottom of the multi-stage reaction kettles which are connected in series, leaves from the tops of the multi-stage reaction kettles, and is subjected to multi-stage reaction to generate the 2-mercaptobenzothiazole; and the top of the last-stage reaction kettle communicates with the stripping tower, and the stripping tower is used for separating the reacted materials into tail gas anda 2-mercaptobenzothiazole coarse product. Continuous production can be achieved by using the reaction device, the yield of the 2-mercaptobenzothiazole reaches 92% or above, the resin content is less than 4%, the production efficiency is high, and the product stability is good.

Description

technical field [0001] The invention relates to the technical field of chemistry and chemical engineering, in particular to a continuous synthesis reaction device for rubber vulcanization accelerator 2-mercaptobenzothiazole. Background technique [0002] 2-Mercaptobenzothiazole (also known as Accelerator M) is a medium-speed accelerator for natural rubber. It can be used alone or mixed with other accelerators. It and its derivatives play an important role in the rubber vulcanization process. There are two main synthetic methods of 2-mercaptobenzothiazole: o-nitrochlorobenzene method and aniline method. Due to the high cost of o-nitrochlorobenzene raw materials, the aniline method is the main method for the industrial synthesis of 2-mercaptobenzothiazole. Specifically, the method is to place aniline, carbon disulfide and sulfur under high temperature and high pressure reaction conditions, and at 200°C and a temperature and pressure above 8MPa, the following reaction occurs: ...

AI Technical Summary

Problems solved by technology

Traditional pipelines or stirred reaction devices do not have rapid mixing capabilities under high temperature and pressure, so it is difficult to control the formation of benzothiazole and anilinobenzothiazole

Although the use of carbon disulfide solution dissolved in sulfur as a reactant can reduce the system’s requirements for the mixing capacity of the reaction device, it is a very dangerous process in the actual operation process to dissolve sulfur with carbon disulfide, and it is easy to cause fires due to static electricity. Therefore, the invention can quickly and uniformly mix aniline The reaction device for the three raw materials of , carbon disulfide and sulfur is very necessary

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