A process optimization method for antimony-free polyester melt delivery

Abstract

The invention discloses an optimization method for conveying process of antimony-free polyester melt. It is the following units: transmission pipeline, booster pump, heat exchanger, melt filter, static mixer, metering pump and spinning assembly; S2: establish a mathematical model for melt transportation and distribution for each unit, and calculate according to the model And simulate the pressure drop, temperature rise, viscosity drop and residence time in the process of conveying each unit; S3: According to the simulation results, the weight relationship formula of the viscosity drop, temperature rise and residence time of the melt is obtained; S4: According to the determined weight relationship Optimize melt delivery and distribution process parameters. The invention combines process design and model building, not only can ensure timely heat dissipation and uniform mixing of antimony-free polyester melt, but also can predict product performance in advance through the model, determine optimized process parameters, and ensure the stability of melt quality.

Description

technical field [0001] The invention relates to the technical field of melt delivery, in particular to an optimization method for an antimony-free polyester melt delivery process. Background technique [0002] Polyethylene terephthalate (PET) is a polycondensation reaction product of ethylene glycol and terephthalic acid, and is a linear macromolecule with high crystallinity and high melting point (about 260°C). As a thermoplastic polyester, PET has good mechanical properties, electrical insulation, chemical resistance and other characteristics. The production of polyester fiber is mainly carried out through melt direct spinning, and melt delivery is one of the key links. Esters are degraded and bubbles are formed. If the temperature is too low, the viscosity of the melt will be too high, resulting in a series of problems such as spinning ends. [0003] Antimony-based catalysts are generally used in the traditional PET preparation process. However, there are heavy metal an...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the lack of systematic research on the relationship between the parameters of the antimony-free polyester melt delivery process and the quality of the polyester melt in the prior art, so it is impossible to improve the melt rate of antimony-free polyester by optimizing the delivery process. In order to solve the problem of body quality, an optimization method for antimony-free polyester melt conveying process is provided, which divides the melt conveying process of antimony-free polyester melt into various units, and establishes the melt conveying and The distribution mathematical model determines the weight relationship of the pressure drop, temperature rise, viscosity drop and residence time changes during the melt delivery process, thereby optimizing the melt delivery and distribution process, stabilizing the quality of the melt, and obtaining a highly stable and uniform melt body

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