Continuous process for producing poly (trimethylene terephthalate)

Continuous process for producing poly (trimethylene terephthalate)

  • CN 1,433,439 A
  • Filed: 08/10/2000
  • Published: 07/30/2003
  • Est. Priority Date: 02/11/2000
  • Status: Abandoned Application
First Claim
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1. be used for producing the continuation method of poly-(propylene glycol ester terephthalate), it may further comprise the steps:

  • (a) continuously the feed liquid incoming mixture to flasher, described liquid feeding mixture comprises catalyzer and two 3-hydroxypropyl terephthalate and 1, the propylidene group that at least a and described liquid feeding mixture of the low-molecular-weight polyester of ammediol and terephthalic acid has and the mol ratio of terephthalic acid ester group are 1.1 to 2.2;

    (b) remove with first logistics evaporation of gas by-product with from described flasher continuously, with liquid flashes device reaction product is discharged from described flasher continuously, the propylidene group that wherein said liquid flashes device reaction product has and the mol ratio of terephthalic acid ester group are lower than about 1.5;

    (c) continuously the described liquid flashes device of charging reaction product to pre-polymerizer and second logistics of poly-(propylene glycol ester terephthalate) prepolymer of the described flasher reaction product of polymerization and gas by-product in described pre-polymerizer continuously to form;

    (d) remove described poly-(propylene glycol ester terephthalate) from described pre-polymerizer continuously, the relative viscosity of described prepolymer is about at least 5;

    (e) extremely final polymerizer and poly-(propylene glycol ester terephthalate) and three logistics of gas by-product of described poly-(propylene glycol ester terephthalate) prepolymer of polymerization to form higher molecular weight continuously of described poly-(propylene glycol ester terephthalate) prepolymer of charging continuously;

    With(f) remove poly-(propylene glycol ester terephthalate) of described higher molecular weight continuously from described final polymerizer, the relative viscosity of poly-(propylene glycol ester terephthalate) of described higher molecular weight is about at least 17.

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