Esterification process

Details Esterification process Esterification process

1976-01-12

1978-06-20

Myers, Jane S.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

560 94, C07C 6982

Patent

active

040961249

ABSTRACT:
Terephthalic acid is esterified with an alkylene glycol by heating in a first stage one mole of the acid with at least about 1.2 moles of the glycol and 0.01 to 1.0% based on the weight of the acid of a volatile organic base at a temperature between 240.degree. and 320.degree. C and at a pressure above the vapor pressure of the glycol at the reaction temperature until about 75-85% of the acid groups initially present in the terephthalic acid have been esterified, and then maintaining the reaction mixtures from the first stage in a second stage at a temperature between 240.degree. to 320.degree. at a pressure less than that of the said first stage until at least about 95% of the acid groups initially present in the terephthalic acid have been esterified.

REFERENCES:
patent: 3050533 (1962-08-01), Munro et al.
patent: 3060152 (1962-10-01), Ringwald
patent: 3185669 (1965-05-01), McKinney
patent: 3185670 (1965-05-01), McKinney
patent: 3444140 (1969-05-01), Stewart et al.

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