Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1991-06-27
1992-06-02
Dees, Jose G.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
560248, 562416, 562417, 585823, 585826, C07C 51265, C07C 5142, C07C 6748, C07C 712
Patent
active
051188384
ABSTRACT:
Substantial proportions of methyl acetate and unreacted polymethylbenzene are recovered from the waste gas produced during the oxidation of a polymethylbenzene to its corresponding polycarboxylic acid by passing the waste gas, after being cooled for removal of water vapor, through at least one bed of activated carbon and subsequently desorbing the methyl acetate and polymethylbenzene from the bed by passing a desorbing medium, such as steam, through the bed. Preferably, the cooled stream is heated to a temperature of at least 21.degree. C. (70.degree. F.) prior to being passed into the bed of activated carbon.
There is also disclosed an improved process for the oxidation of a polymethylbenzene to its corresponding aromatic polycarboxylic acid, which process comprises producing the polycarboxylic acid and waste gas comprising methyl acetate, water vapor, and unreacted polymethylbenzene and treating the waste gas according to the above method.
REFERENCES:
patent: 2833816 (1958-05-01), Saffer et al.
patent: 3089906 (1963-05-01), Saffer et al.
patent: 4777287 (1988-10-01), Zeitlin et al.
Fjare Kristi A.
Graziano Diane J.
Hacker David S.
Kissinger Stacey L.
Zeitlin Martin A.
Amoco Corporation
Blumberg Gunar J.
Clarke Vera C.
Dees Jos,e G.
Magidson William H.
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