Preparation of terephthalic acid from a crude dimethyl terephtha

Details Preparation of terephthalic acid from a crude dimethyl terephtha Preparation of terephthalic acid from a crude dimethyl terephtha

1980-04-18

1986-03-25

Trousof, Natalie

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

562483, 203 48, 203 73, 203DIG6, 203DIG8, C07C 6739, C07C 5109, B01D 314, B01D 902

Patent

active

045785015

ABSTRACT:
A process for the production of a crude dimethyl terephthalate suitable for hydrolyzing into a fiber grade terephthalic acid involves separating a crude ester obtained from the production of dimethyl terephthalate by the Witten process by vacuum distillation at elevated pressure in a three-column series arranged distillation system. In the first distillation column of the system the crude is separated into a methyl p-toluate-rich fraction as head product; in a second column of the series, into a fraction rich in methyl ester of terephthalaldehydic acid as head product; and in a third distillation column, a crude dimethyl terephthalate fraction. The crude dimethyl terephthalate fraction has a methyl ester of terephthalaldehydic acid content of 0.01-0.1% by weight as a head product.

REFERENCES:
patent: 2646393 (1953-07-01), Hughes et al.
patent: 2992168 (1961-07-01), Wilson et al.
patent: 3399227 (1968-08-01), Tapulionis
patent: 4302595 (1981-11-01), Svhoengen et al.
Kirk-Othmer, "Encyclopedia of Chemical Technology", 2nd Ed., vol. 6, 1965, pp. 482 and 492-493.

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