Process control technology for producing nylon 6 through caprolactam continuous ring-opening polymerization

By using the tandem use of prepolymerization tower and polymerization tower in the production of nylon 6, hydrolyzed ring-opening prepolymerization and high-temperature polymerization reaction are carried out, the problem of excessive dimer content in nylon 6 is solved, and product quality and production efficiency are improved.

CN119708465APending Publication Date: 2025-03-28BEIJING SANLIAN HOPE TEXTILE & CHEM TECH
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Patent Information

Application Number
CN202311266960.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-27
Publication Date
2025-03-28

AI Technical Summary

Technical Problem

In the prior art, the dimer content in nylon 6 is too high, which affects product quality. At the same time, the problems of waste of raw materials and separation of oligomers during polymerization cannot be effectively solved.

Method used

The prepolymerization tower and polymerization tower are used in the front and back series of two integrated reaction towers, and the prepolymerization tower is used to hydrolyze the ring-opening prepolymerization reaction and high-temperature polymerization reaction of caprolactam. Through the multi-stage tandem structure and temperature and pressure control, the accumulation of cyclic dimers and the generation of oligomers are reduced.

Benefits of technology

The relative viscosity of nylon 6 is increased, the production time is shortened, the production cost is reduced, and the extractable content in the nylon 6 slices is effectively reduced, and the accumulation of cyclic dimers is prevented.

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Abstract

The invention belongs to the technical field of copolymerization of nylon 6, and particularly relates to a flow control process for producing nylon 6 by continuous ring-opening polymerization of caprolactam, which adopts a pre-polymerization tower and a polymerization tower which are connected in series for use; the prepolymerization tower is sequentially provided with a first heat exchanger, a second heat exchanger and a first reactor from the tower top to the tower bottom; a third heat exchanger, a second reactor and a third reactor are sequentially arranged in the polymerization tower from the tower top to the tower bottom and can respectively control the pressure and the temperature; a multi-section tandem type structure is adopted in each of the pre-polymerization tower and the polymerization tower, the viscosity of a high polymer is improved by controlling reaction heat in the reaction process and controlling an oligomer in the polymerization process, the process is optimized by controlling the temperature and the pressure of each part so as to reduce the content of cyclic dimers in the circulation process, and the production cost is reduced. And the content of extractable substances in the nylon 6 slices and the accumulation of cyclic dimers are reduced, so that the generation of oligomers can be reduced.
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