Process for the purification of dimethyl terephthalate

Details Process for the purification of dimethyl terephthalate Process for the purification of dimethyl terephthalate

1990-12-03

1992-05-26

Dawson, Robert A.

Liquid purification or separation

Processes

Separating

203 48, 210196, 210770, 560 78, B01D 900, B01D 2978, C07c 6752

Patent

active

051165180

ABSTRACT:
In the process for the purification of diemthyl terephthalate (DMT) by recrystallization from methanolic solution, the mother liquor containing the impurities, substantially the isomers DMI, DMO and aldehydes, is separated off and passed to a workup tank. The moist crystals are dried by melting with the evaporation of methanol. The mother liquor is then separated off by filtration, and the moist crystals obtained from the separation are washed before melting. The washing liquid is recycled together with a portion of the separated mother liquor into the recrystallization tank.

REFERENCES:
patent: 3076019 (1963-01-01), Baldwin
patent: 4126755 (1978-11-01), Bunger et al.
patent: 4683034 (1987-07-01), Bader et al.
patent: 4760165 (1988-07-01), Hasegawa et al.

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