B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
252/72
B01J 31/04 (2006.01) B01J 31/40 (2006.01) C07C 69/82 (2006.01)
Patent
CA 1145739
ABSTRACT OF THE DISCLOSE: 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 residue 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 mono- methyl 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: Image wherein a represents the sum of trimellitic acid and mono- methyl ester of trimellitic acid, b is the amount of heavy metal oxidation catalyst within the extract, and d is in a range of from 60 to 300 p.p.m.
353795
Bunger Heinrich
Cordes Rudolf
Hoffmann Gerhart
Dynamit Nobel Aktiengesellschaft
Robic Robic & Associes/associates
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