Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1981-12-01
1983-02-08
Konopka, P. E.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252414, 252420, 560 77, B01J 3140, C07C 6982
Patent
active
043728758
ABSTRACT:
A process for effecting the recovery and use of a heavy metal oxidation catalyst from a high-boiling distillation residue obtained during the Witten process for the production of dimethyl terephthalate involves the extraction of the high-boiling distillation reside with water or dilute aqueous solution of low molecular weight aliphatic monocarboxylic acids or alcohols and recycling of the extract into the oxidation stage of the Witten process. In the extract the quantitative ratio of the sum of the amount of trimellitic acid and monomethyl ester of trimellitic acid to the amount of heavy metal catalyst is controlled to be at a value of no more than 1.8:1 and in the oxidation stage of the Witten process the catalyst concentration (c), expressed in p.p.m., is represented by the formula:
REFERENCES:
patent: 2894498 (1959-07-01), Katzschmann
patent: 3551481 (1970-12-01), Hulsman
patent: 3914287 (1975-10-01), Takeda et al.
patent: 4092481 (1978-05-01), Bunger
patent: 4096340 (1978-06-01), Fujii et al.
patent: 4126755 (1978-11-01), Bunger et al.
Bunger Heinrich
Cordes Rudolf
Hoffmann Gerhart
Dynamit Nobel Aktiengesellschaft
Konopka P. E.
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