Recovering catalyst values in reaction liquors from oxidative production of carboxylic and polycarboxilic acids
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United States of America Patent
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May 13, 1980
Grant Date -
N/A
app pub date -
Feb 27, 1978
filing date -
Apr 7, 1977
priority date (Note) -
Expired
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Abstract
Heavy metal values are recovered from mother liquors remaining from oxidations to mono- or poly- carboxylic acids in aliphatic monocarboxylic acids in presence of catalyst heavy metals and bromides by (1) concentrating, (2) precipitating and (3) separating heavy metals as sulphates and (4) recovering aliphatic monocarboxylic acid and H Br by distillation, (5) dissolving sulphates in water, (6) adsorbing heavy metals on a cation exchange resin and (7) desorbing them, preferably with the solution from Step 4.
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