Polyester manufacturing apparatus and method

Abstract

The present invention provides a manufacturing apparatus of polyester and a method for manufacturing polybutylene terephthalate, wherein a first processor of preparing an oligomer is improved in efficiency. The apparatus for manufacturing polybutylene terephthalate in the present invention comprises, at least, a first processor 1 including a vertical cylindrical esterification processor 10, a lower header tube constituted by a plurality of unit lower header tubes 111a-d, an upper header tube constituted by a plurality of unit upper header tubes 113a-d, heat transfer tubes 112a-d that are made of a plurality of communicating tubes connecting the unit lower header tubes 111a-d and the unit upper header tubes 113a-d, which are vertically facing each other, so as to enable a vapor phase or liquid phase heat medium to be communicable therethrough, and an agitation blade 120, characterized in that the respective unit lower header tubes 111a-d and the respective unit upper header tubes 113a-d are formed with a heat medium outflow and inflow unit.

Description

technical field [0001] The present invention relates to polybutylene terephthalate, polyethylene terephthalate, polytrimethylene terephthalate, polybutylene succinate, polyethylene succinate, etc. A continuous production method and apparatus for ester-based polymers. Background technique [0002] These polyesters are synthesized by using dicarboxylic acids and diols as raw materials, adding a catalyst to these mixtures, and then passing through an esterification step and a polymerization step. In the esterification process, the carboxyl groups of the two dicarboxylic acids undergo esterification reactions with diols to form monomers, and the monomers undergo polycondensation reactions to form oligomers with an average degree of polymerization of about 1-10. As one of the polyester-based polymers, a method for producing polybutylene terephthalate (hereinafter referred to as PBT) and an apparatus thereof are known in JP-A-62-195017 (Patent Document 1), JP-A The device disclo...

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Problems solved by technology

exist Figure 5a In the device described in Patent Document 2 shown, the upper and lower headers are respectively integrally formed in the circumferential direction, so there is a corresponding Figure 5b The distance is long, and the possibility of thermal stress damage becomes high

In addition, the possibility of such thermal stress damage becomes high under high-temperature conditions, so the reaction time becomes long and the amount of reaction by-products is large. Therefore, when the device of Patent Document 2 is used, it is inevitable that the The reaction is carried out at an unfavorable low temperature, resulting in a long reaction time and a large amount of reaction by-products, therefore, there is a problem of reduced production efficiency

[0008] In addition, in the first reactor described in the above-mentioned Patent Document 1, a plurality of heat transfer tubes are arranged in the upper and lower headers, and therefore, thermal stress due to thermal expansion in the circumferential direction of the headers may be caused during high-temperature operation. broken problem

The same problem also exists when dealing with the diethylene glycolization of ethylene glycol in the polymerization of polyethylene terephthalate and the acroleylation of 1,3-propanediol in the polymerization of polytrimethylene terephthalate. occur

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