Compositions – Preservative agents – Anti-oxidants or chemical change inhibitants
Patent
1974-04-22
1976-05-11
Douglas, Winston A.
Compositions
Preservative agents
Anti-oxidants or chemical change inhibitants
252416, 260524R, 423 50, 423140, 423144, B01J 3700, C07C 5142, C01G 4500, C01G 5106
Patent
active
039561755
ABSTRACT:
A method for recovering a heavy metal oxidation catalyst used in a liquid-phase oxidation process for producing terephthalic acid from the residue of the reaction mother liquor by stirring the residue together with water in the presence of molecular oxygen and a sulfur compound, subjecting the extracted mixture to a solid-liquid separation to separate the solid impurities, adding the aqueous solution containing the oxidation catalyst to an alkali metal or ammonium carbonate or an aqueous solution of an alkali metal or ammonium carbonate while maintaining the temperature of the system at about 26.degree.C to 70.degree.C, and recovering the heavy metal catalyst as a carbonate precipitate having high purity and good filterability and washability.
REFERENCES:
patent: 2964559 (1960-12-01), Burney
patent: 3033899 (1962-05-01), Knobloch et al.
patent: 3105851 (1963-10-01), Knobloch et al.
patent: 3341470 (1967-09-01), Hensley, Jr.
patent: 3673154 (1972-06-01), Trevillyah
patent: 3840641 (1974-10-01), Wampfler et al.
Kuki Michio
Shigeyasu Motoo
Yamazaki Hatsutaro
Douglas Winston A.
Konopka P. E.
Matsuyama Petrochemicals Inc.
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