Process for the preparation of dimethyl terephthalate

Details Process for the preparation of dimethyl terephthalate Process for the preparation of dimethyl terephthalate

1975-06-03

1978-06-20

Myers, Jane S.

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

Organic compounds

Carboxylic acid esters

560 78, C07C 6982

Patent

active

040963403

ABSTRACT:
In the process for preparing dimethyl terephthalate by oxydizing p-xylene and/or methyl p-toluate with molecular oxygen or a molecular oxygen-containing gas in the presence of a heavy metal catalyst, esterifying the resulting oxidation reaction mixture with methanol, followed by submitting the resulting esterification reaction mixture to distillation to separate dimethyl terephthalate and fractions of lower boiling point than dimethyl terephthalate, and thereafter recycling to said oxidation step (A) the distillation residue containing said heavy metal catalyst and/or (B) the extract portion containing said heavy metal catalyst obtained by further extraction treatment of said distillation residue (A), the improvement which comprises contact-treating said distillation residue (A) or said extract portion (B) with methanol prior to recycling same.

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