Process for the distillation of crude ester in the DMT/PTA proce

Details Process for the distillation of crude ester in the DMT/PTA proce Process for the distillation of crude ester in the DMT/PTA proce

1997-01-17

1998-12-22

Manoharan, Virginia

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

Organic compounds

Carboxylic acid esters

202158, 203 29, 203 86, 203 91, 203DIG21, 560 78, C07C 6739, C07C 6754, B01D 300

Patent

active

058522018

ABSTRACT:
A process for preparing crude dimethyl terephthalate, comprises oxidizing a mixture comprising para-xylene and methyl para-toluate, esterifying the oxidized mixture with methanol, separating the resulting crude ester into fractions. By separating the crude ester with a distillation column containing structured packing and using a lower bottom temperature, product yield is increased, and the process is made more economical.

REFERENCES:
patent: 4235844 (1980-11-01), Sterzel et al.
patent: 5073236 (1991-12-01), Gelbein et al.
patent: 5254719 (1993-10-01), Holzhauer et al.
patent: 5277878 (1994-01-01), Piotrowski et al.
patent: 5419136 (1995-05-01), McKeigue
patent: 5578254 (1996-11-01), Mix
patent: 5612067 (1997-03-01), Abrams
Ullman vol. 22, 4.sup.th Edition, pp. 529-533, G. Hoffmann, et al., "Terephthalsaeuredimethylester" (Dimethyl Terephthalate).

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