Minimizing iron in recovered oxidation catalyst material in DMT

Details Minimizing iron in recovered oxidation catalyst material in DMT Minimizing iron in recovered oxidation catalyst material in DMT

1981-01-21

1982-10-12

Konopka, P. E.

Compositions

Preservative agents

Anti-oxidants or chemical change inhibitants

252420, 423 50, 423140, 560 77, 560 78, B01J 3140, C07C 6982, C01G 5100, C01G 4902

Patent

active

043538100

ABSTRACT:
Disclosed is an improvement in a method for the recovery for recycle to the cooxidation-coesterification process for the production of dimethyl terephthalate from p-xylene, air and methanol of oxidation catalyst by aqueous extraction of a distillation residue containing the same. To minimize recycle of any iron present in the residue, iron oxidant material (for example, hydrogen peroxide) is admixed in one embodiment with the residue and water in the aqueous extraction procedure, and in a second embodiment with the resulting aqueous extract. In both embodiments, if any iron is present, it is precipitated. In the first embodiment the precipitate stays with the residue. In the second embodiment the aqueous extract is separated from the precipitate.

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Chemical Abstracts 89:31508 (P)--(1978), "Recovery of Liquid Phase Oxidation Catalyst", Shigeyasu et al.
Derwent Abstract of Japanese Publ. Appl. 53/37,592, 2/26/80.
Derwent Abstract of Japanese Publ. Appl. 55/027,037, 4/6/78.

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