Process for making linear polyesters from ethylene glycol and te

Details Process for making linear polyesters from ethylene glycol and te Process for making linear polyesters from ethylene glycol and te

1977-04-18

1978-03-07

Rzucidlo, Eugene C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

560 79, 560 89, C08G 6322, C07C 6976

Patent

active

040779459

ABSTRACT:
A batch process for esterifying ethylene glycol and terephthalic acid at elevated temperature and pressure in which a part of the ethylene glycol required for the complete esterification reaction is placed in an autoclave and heated under pressure, and the remainder of the glycol is added to said heated glycol in the form of a paste with terephthalic acid. Preferably the glycol initially present in the autoclave amounts to 0.3 to 0.8 moles per mole of terephthalic acid while the glycol added as a paste amounts to 1.4 to 0.9 moles per mole of terephthalic acid. The glycol initially in the autoclave may be glycol reclaimed from the mixture volatilized during the reaction and may contain up to 20% water, preferably 2-6% water.

REFERENCES:
patent: 3487049 (1969-12-01), Busot
patent: 3590072 (1971-06-01), Leybourne
patent: 3655729 (1972-04-01), Rinehart
patent: 3689461 (1972-09-01), Balint et al.
patent: 3697579 (1972-10-01), Balint et al.
patent: 3892798 (1975-07-01), Heeg et al.

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