Production of polycarboxylic acids with hafnium-activated cobalt

Details Production of polycarboxylic acids with hafnium-activated cobalt Production of polycarboxylic acids with hafnium-activated cobalt

1991-06-06

1992-05-12

Dees, Jose G.

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

Organic compounds

Heterocyclic carbon compounds containing a hetero ring...

502102, 502171, 502227, 549248, 562416, 562417, C07C 51265

Patent

active

051129922

ABSTRACT:
The addition of hafnium to oxidation catalysts provided by a heavy transition metal-bromine ion catalyst combination containing cobalt-manganese-bromine or manganese-bromine or cobalt-bromine and a soluble source of hafnium uniquely increases catalytic activity of the said catalyst combination for converting methyl groups on the benzene nucleus. The presence of hafnium in the total reactor contents is equal to or less than 250 parts per million by weight of the total reactor mother liquor. The solubility of the hafnium in the reactor solvent is such that reactor product cake contains less than 0.3 ppm by weight. Bromine emissions can be reduced.

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patent: 4323699 (1982-04-01), Norval
patent: 4500730 (1985-02-01), Tanaka et al.
patent: 4873366 (1989-10-01), Matsuda et al.

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