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Nylon-6 slice production method capable of improving polymerization conversion rate

A production method and conversion rate technology, which is applied in the field of spinning, can solve the problems of low polymerization conversion rate and unsuitability for large-scale production and use of enterprises, and achieve the effects of improving economic benefits, improving raw material utilization, and reducing pressure

Inactive Publication Date: 2015-03-04
HUNAN JINBO CHEM FIBER
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The polymerization conversion rate in the current nylon 6 polymerization process is very low, which is not suitable for large-scale production and use in enterprises

Method used

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  • Nylon-6 slice production method capable of improving polymerization conversion rate

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Embodiment 1

[0023] Embodiment 1, technological process such as figure 1 Shown:

[0024] (1) Raw material melting and storage

[0025] The purchased solid caprolactam raw materials are pulverized by 11M01 and put into the horizontal melting kettle 11V01, heated to melting by low-pressure steam in the kettle, filtered by 11F01 and sent to the melting caprolactam storage tank 11V03; the purchased liquid caprolactam raw materials are transported to the factory by tanker The caprolactam unloading pump 01P05 is sent into the liquid caprolactam storage tank 01V07. The two are compounded according to a certain ratio, and after being finely filtered by 11F03, they are sent to the monomer high tank 12V01 for polymerization.

[0026] (2) Additive preparation

[0027] Matting agent preparation:

[0028] The present invention adopts the titanium dioxide suspension as the matting agent, and its preparation is divided into two batchings: the first batching, the suspension in the crude titanium dioxi...

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PUM

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Abstract

The invention discloses a nylon-6 slice production method capable of improving a polymerization conversion rate. The method comprises the following steps: fusing and storing raw materials, preparing an additive, performing pre-polymerization, performing post polymerization, performing casting strip slicing, performing multistage extraction, performing continuous drying, conveying the slices, metering and packaging. The method disclosed by the invention has the beneficial effects that a two-stage polymerization process, namely pressurized pre-polymerization and normal pressure post polymerization, is adopted, a polymerization tower is subjected to sectional heat supply by utilizing different heat transfer media, and different requirements on reaction conditions at different reaction stages are met by using a flash technology, so that the polymerization conversion rate of caprolactam is improved from the conventional 90 percent to over 92 percent. Therefore, the raw material utilization rate is improved, the pressure at the extraction and recovery section is alleviated, the product cost is reduced, and the economic benefits are improved.

Description

technical field [0001] The invention relates to the technical field of spinning, in particular to a method for producing nylon 6 chips that significantly improves the polymerization conversion rate. Background technique [0002] Nylon 6 was put into industrial production in 1943 and developed rapidly due to its good physical and textile properties. Nylon 6 is formed by ring-opening polymerization of caprolactam, and its polymerization can be divided into two types according to the different ring-opening agents used: one is to use alkali substances as ring-opening agents, which is called alkali polymerization; the other is mainly Using water as a ring-opening agent is called hydrolytic polymerization. The production of nylon 6 chips for spinning generally adopts hydrolytic polymerization. [0003] The hydrolytic polymerization process of caprolactam includes three stages: initiation addition, chain growth, and chain equilibrium. In the stage of initiating addition, caprola...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/14C08G69/16C08G69/46C08K3/22
Inventor 廖建平胡诗勇刘万里朱大军
Owner HUNAN JINBO CHEM FIBER
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