Micro-reaction system and method for continuous synthesis of rubber anti-scorch agent CTP

Abstract

A micro-reaction system and method for continuous synthesis of rubber anti-scorch agent CTP, the system is composed of a micro-heat exchanger, a chlorination micro-reactor, a condensation micro-reactor, and a stirred tank reactor in series; the synthesis method is: dicyclohexyl The disulfide is pre-cooled in the micro heat exchanger, and then continuously reacts with chlorine gas in the chlorination microreactor to generate cyclohexylsulfenyl chloride; cyclohexylsulfenyl chloride continuously flows out of the chlorination microreactor and enters the condensation microreactor, Condensate with the pre-prepared phthalimide salt to generate a reaction solution containing N-cyclohexylthiophthalimide (CTP), which enters the stirred tank reactor for precipitation or continues to stir and agglomerate The CTP slurry is obtained, and the CTP product is obtained through water separation and refining. The invention realizes the continuous synthesis of CTP products widely used in the rubber additive industry; the condensation reaction time in the microchannel reactor is on the millisecond level, and the sinking / stirring time in the stirred tank reactor is shortened to 10-20 minutes, and the two-step reaction The total yield is as high as 96.6%.

Description

technical field

[0001] The invention belongs to the field of auxiliary agent synthesis in the rubber industry, and in particular relates to a micro-reaction system and method for continuous synthesis of rubber anti-scorch agent CTP. Background technique

[0002] Rubber anti-scorch agent CTP is an indispensable additive to prevent scorch behavior in the rubber industry. Raw rubber needs to go through a series of processes such as mastication, mixing, calendering, and vulcanization to become rubber products. In the processing process before vulcanization, due to the heat and high temperature generated during mechanical work, the rubber often undergoes early vulcanization (called coke). burning), making it difficult for the rubber compound to continue to vulcanize and cross-link. The combination of the anti-scorch agent CTP can realize the sealed mixing of the rubber in rubber production, prolong the scorch time, and at the same time not hinder the normal performance of the vu...

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