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Reaction system and method for producing high-molecular-weight polyester through continuous melt polycondensation

A high molecular weight, melt polycondensation technology, applied in the field of polyester synthesis, can solve the problems of low conversion rate of reactant concentration and low reaction efficiency

Pending Publication Date: 2020-07-10
CHINA PETROLEUM & CHEM CORP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a reaction system and method for continuous melt polycondensation to produce high molecular weight polyester. Different from the traditional two-step method, the present invention synthesizes high molecular weight polyester in one step, thereby realizing high purity of esterification reaction. reaction to solve the defects of low reaction efficiency and low conversion rate of reactant concentration in traditional reactors

Method used

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  • Reaction system and method for producing high-molecular-weight polyester through continuous melt polycondensation
  • Reaction system and method for producing high-molecular-weight polyester through continuous melt polycondensation
  • Reaction system and method for producing high-molecular-weight polyester through continuous melt polycondensation

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Embodiment 1

[0051] A kind of synthetic method of bottle-grade copolyester, the degree of polymerization of described bottle-grade copolyester is DP150, and polymer output is 12500kg / h, and preparation method is as follows:

[0052] I. Esterification reaction:

[0053] Take terephthalic acid (PTA) and ethylene glycol (EG) at an alkyd molar ratio of 1:1.8, and mix them uniformly at 60°C to obtain a slurry. The slurry is passed into the tubular heater 21 to continue the heat treatment, and the temperature of the slurry discharged from the tubular heater 21 reaches 262°C; the heated slurry is passed into the esterification reactor 20 for further processing. Esterification reaction, wherein the temperature in the primary reactor is 260°C and the pressure is 70KPa, the temperature in the secondary reactor is 265°C and the pressure is 0.0KPa, and the slurry is in the esterification reactor 20 The total residence time of the reaction product is 3.0 hours. After the reaction, the esterification r...

Embodiment 2

[0062] A kind of synthetic method of film-grade polyester PET, the degree of polymerization of described film-grade polyester is DP 120, polymer output is 12500kg / h, preparation method is as follows:

[0063] I. Esterification reaction:

[0064] Take terephthalic acid (PTA) and ethylene glycol (EG) at an alkyd molar ratio of 1:1.6, and mix them uniformly at 60°C to obtain a slurry. The slurry is passed into the tubular heater 21 to continue the heat treatment, and the temperature of the slurry discharged from the tubular heater 21 reaches 265°C; the heated slurry is passed into the esterification reactor 20 for further processing. Esterification reaction, wherein, the temperature in the primary reactor is 260°C, the pressure is 50KPa, the temperature in the secondary reactor is 263°C, and the pressure is 0.0KPa (gauge pressure), the slurry is in the esterification The residence time in the reactor 20 was 2.5 hours in total. After the reaction, the esterification rate of the o...

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Abstract

The invention aims to provide a reaction system and method for producing high-molecular-weight polyester through continuous melt polycondensation. Different from the traditional two-step method, the one-step method provided by the invention is used for synthesizing high-molecular-weight polyester, so that high-purity reaction of esterification reaction is realized, and the defects of low reactionefficiency and low reactant conversion rate of the traditional reactor are overcome; in order to achieve the purpose, the invention provides the reaction system and method for producing the high-molecular-weight polyester through continuous melt polycondensation. According to the reaction system and the method, integration of product differentiation, production line flexibility, online monitoringtechnology, environmental protection and energy saving technology is embodied, and the development of the industry is greatly promoted; the reaction system provided by the invention comprises an esterification reactor, a pre-polycondensation reactor and a final polycondensation reaction kettle, wherein the esterification reactor, the pre-polycondensation reactor and the final polycondensation reaction kettle are sequentially connected through pipelines.

Description

technical field [0001] The invention belongs to the field of polyester synthesis, in particular to a reaction system and method for producing high-molecular-weight polyester through continuous melt polycondensation. Background technique [0002] The traditional method of manufacturing high molecular weight (polymerization degree ≥ 150) polyester is to use liquid phase polymerization to produce solid particles with medium molecular weight (polymerization degree 30-110), and then use solid-state polycondensation to increase the molecular weight of polyester. Two-step process. With the development and technological progress of the polyester industry, it has become a trend to increase the size of the process and equipment for manufacturing high molecular weight polyester by one-step melt polycondensation. [0003] The traditional liquid-phase thickening process for producing medium-molecular-weight polyester uses 3 to 5 reactors, which are basically tank-type reaction sections. ...

Claims

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Application Information

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IPC IPC(8): C08G63/78C08G63/183
CPCC08G63/785C08G63/183
Inventor 汪少朋杨勇谭燕林永明刘斌袁红卿
Owner CHINA PETROLEUM & CHEM CORP
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