Polyester production device

Abstract

The invention relates to a polyester production device which comprises a polycondensation reactor, a vacuum static reactor arranged downstream the polycondensation reactor and communicated with the polycondensation reactor, and an extrusion device arranged downstream the vacuum static reactor, wherein temperature in the vacuum static reactor is the same as that in the polycondensation reactor; the vacuum static reactor comprises a housing and a screen mesh; the screen mesh is perpendicular to the axial direction of the housing and is arranged in the housing; a gas emission pipe with a part bent upwards is arranged on the polycondensation reactor. The polyester production device provided by the invention is greatly higher in small molecule removal in the polycondensation process, so as to further prolong the molecular chain of polyester.

Description

technical field [0001] The invention relates to a polymer production plant, in particular a polyester production plant. Background technique [0002] Polyester is widely used in textiles, engineering plastics, beverage packaging and other fields, and its production scale is also expanding rapidly. However, there are still some problems in the production of polyester, for example, during the process of polyester final polymerization, reaction products such as small molecules and water need to be removed. This is because the polycondensation reaction of polyester monomer is an equilibrium reaction, and the reaction equilibrium constant is small. If the small molecules and water generated by the reaction are not removed as soon as possible, the reaction rate will be affected, and the required degree of polymerization will not even be reached. . [0003] General-purpose polyester preparation equipment and methods are mainly for polyethylene terephthalate (PET), polybutylene te...

AI Technical Summary

Problems solved by technology

[0004] Now there are more and more new synthetic biodegradable polyesters, which introduce aliphatic polyester segments into their structures to make the molecular chains more flexible, but this also causes crystallinity and Extreme variation in crystallization rate, existing polyester production plants and methods are poorly suited for these types of polyesters

For example, in the later stage of polymerization, as the molecular weight of polyester increases, the melt viscosity increases, and it is difficult to diffuse and remove small molecules, and it is difficult to further increase the molecular chain

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