Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1979-06-20
1983-06-07
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
C07C 5116
Patent
active
043872433
ABSTRACT:
An improved two-step catalytic neat oxidation of liquid xylene is provided wherein there is no separation of oxidation products from the first oxidation step nor minimum limitation imposed on the liquid o-xylene concentration entering the second step according to the prior two-step oxidations of o-xylene. Rather the first step is conducted under conditions such that the liquid effluent from the first step contains from 6 up to 30 weight percent liquid o-xylene and from 8 up to 40 weight percent o-phthalic acid and such effluent is directly oxidized with air in the second step. By such improved two-step oxidation there is obtained a liquid product containing o-phthalic acid in yields of up to 85-87% of the theoretical yield and also containing impurities separable from o-phthalic acid after it has been converted to its anhydride in vapor form and the anhydride vapors are separated from water vapor. Such two step neat oxidation of liquid o-xylene provides a route to phthalic anhydride commercially competitive with routes starting with the vapor phase oxidation of o-xylene.
REFERENCES:
patent: 2644840 (1953-07-01), Roebuck
patent: 2858334 (1958-10-01), Landau et al.
patent: 3920735 (1975-11-01), Wampfler et al.
Huie Nicholas C.
Kuhlmann George E.
Naim Houssam M.
Blumberg Gunar J.
Magidson William H.
McClain William T.
Siegel Alan
Standard Oil Company (Indiana)
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