Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1979-08-29
1980-07-29
Raymond, Richard
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
2603464, C07D30789
Patent
active
042150523
ABSTRACT:
Phthalic anhydride of commercially acceptable quality can be produced continuously in yields of from about 80 up to about 83 mole percent (% of theoretical) through a combination of steps starting with the neat oxidation of liquid o-xylene with air in the presence of the catalysis provided by cobalt, manganese and bromine. Said oxidation is conducted in two steps wherein the first step is conducted under mild conditions and short residence time to provide a liquid effluent containing 8 to 40 weight percent o-phthalic acid and 6 to 30 weight percent o-xylene and the second step oxidizes such liquid effluent composition under more vigorous conditions including higher reaction temperature and longer residence time until substantially all of the o-xylene and precursors of o-phthalic acid have been converted to o-phthalic acid. Thereafter the second liquid oxidation effluent is subjected to simultaneous rapid dehydration and phthalic anhydride evaporation followed by contact of the resulting mixture of vapors first with a noble metal catalyst to remove bromine contamination and then with a reflux liquid in a fractionation system to remove water as part of a top fraction and provide a liquid partially purified anhydride as the bottom fraction which is heated with a catalytic amount of KOH to remove phthalide and finally the phthalide-free liquid partially purified anhydride is fractionated to obtain, in known manner, high purity phthalic anhydride product.
REFERENCES:
patent: 2670325 (1954-02-01), West et al.
patent: 3402184 (1968-09-01), Berthoux et al.
patent: 3484458 (1969-12-01), Stein et al.
patent: 4165324 (1979-08-01), Schroeder et al.
Huie Nicholas C.
Kuhlmann George E.
Naim Houssam M.
Palmer David A.
Schroeder Hobe
Ahlers Fred R.
Magidson William H.
McClain William T.
Raymond Richard
Standard Oil Company (Indiana)
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