Process for the continuous production of polybutylene terephthal

Details Process for the continuous production of polybutylene terephthal Process for the continuous production of polybutylene terephthal

1984-02-22

1985-02-12

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

528480, C08G 6334

Patent

active

044992610

ABSTRACT:
Continuous multistep, economical, energy-saving process for making polybutylene terephthalate in which the butanediol-1,4 used to transesterify dimethyl terephthalate is supplied from the condensed vapors volatilized during the precondensation and polycondensation steps of the process. These vapors, which contain low-soluble esters of terephthalic acid as well as butanediol, are condensed by contact with fresh butanediol, and volatilized butanediol containing the esters is recycled to the initial transesterification stage for reaction with dimethyl terephthalate. No additional butanediol is required for the reaction.

REFERENCES:
patent: 3940367 (1976-02-01), Pelousek et al.
patent: 4014858 (1977-03-01), Chipman et al.
patent: 4329444 (1982-05-01), Borman

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