Method used for recycling caprolactam for PA6 polymerization production

A technology of caprolactam and concentrated liquid, which is applied in the direction of single-component polyamide rayon and other directions, can solve the problems of easy blockage of pipelines, difficult cleaning, and inconvenient operation, and achieve the effect of reducing production costs and ensuring the quality of chip spinning.

Active Publication Date: 2017-11-28
YANGMEI GRP TAIYUAN CHEM NEW MATERIAL
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Problems solved by technology

[0005] In order to solve the problems of large consumption and high energy consumption in the existing process of recovering caprolactam, especially in the oligomer separation process, the pipeline is easy to block, difficult to clean, high cost and inconvenient to operate, etc., and the present invention provides a recovery caprolactam Method for PA6 polymerization production

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  • Method used for recycling caprolactam for PA6 polymerization production
  • Method used for recycling caprolactam for PA6 polymerization production
  • Method used for recycling caprolactam for PA6 polymerization production

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[0013] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Apparently, the described embodiments are only some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other implementations obtained by persons of ordinary skill in the art without making creative efforts fall within the protection scope of the present invention.

[0014] The technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0015] A method for recovering caprolactam for PA6 polymerization production, comprising the following steps: extracting water with a caprolactam content of about 10% from the extraction process, after three-effect evaporation and concentration, to obtain a concentrated solution with a caprolactam content of 75±5%; It is char...

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Abstract

The invention relates to a method used for recycling caprolactam for PA6 polymerization production. The method comprises following steps: extraction water from extraction is subjected to triple effect evaporation concentration so as to obtain a concentrate, wherein the caprolactam content of the extraction water is about 10%; the concentrate is subjected to treatment using a filtration system, is delivered into a pre-dehydration column for dehydration, then is delivered into a primary distillation tower and a rectifying tower, and at last is subjected to mixing reaction with fresh caprolactam; and at last pelletizing, extracting, and drying are carried out so as to obtain PA6 slices. The method is capable of solving problems in the prior art that pipelines are always blocked, cleaning difficulty is high, energy consumption is large, and operation is not convenient, ensuring continuous stable operation of caprolactam recycling, ensuring the quality of recycled caprolactam is capable of satisfying requirements of high speed spinning slice production, and reducing production cost greatly without influencing slice spinning quality.

Description

technical field [0001] The invention relates to the field of recycling caprolactam for PA6 polymerization production, in particular to a method for recycling caprolactam for PA6 polymerization production. Background technique [0002] PA6 is a kind of thermoplastic polyamide polymer material with stable chemical properties, good mechanical properties and impact resistance, so PA6 is the most widely used in defense industry, machinery industry, electronics industry, automobile technology and textile industry. one of the materials. At present, the domestic production process of PA6 has matured. Due to its excellent spinning performance, the demand for high-speed spinning PA6 chips in the market is higher than that of conventional spinning chips, but it has higher requirements for the quality of raw material caprolactam. Using pure and fresh caprolactam to polymerize PA6 slices, although the quality of raw materials meets the requirements, the production cost is high. Therefor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G69/14C08G69/16D01F6/60
CPCC08G69/14C08G69/16D01F6/60
Inventor 张建勇王耀斌荆晓明陆辉张婷婷赵献峰戎建平梁秉红
Owner YANGMEI GRP TAIYUAN CHEM NEW MATERIAL
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