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
042150558
ABSTRACT:
Phthalic anhydride of commercially acceptable quality can be recovered from the neat oxidation of liquid o-xylene with air in the presence of the catalysis system provided by cobalt, manganese and bromine conducted in a single step and in the presence of a small amount of benzoic acid to make miscible liquid o-phthalic acid and liquid o-xylene conducted in a single step to an 85 to 90 mole percent yield of o-phthalic acid provided the resulting liquid oxidation effluent is subjected to rapid dehydration of o-phthalic acid to its anhydride and rapid evaporation of the anhydride, water and compounds boiling between water and said anhydride which evaporation entrains phthalide in the vapor mixture followed by contact of the vapor mixture in a fractionating system whose reflux liquid is inert, boils at a temperature below the boiling temperature of phthalic anhydride and is a solvent therefor at a temperature below the freezing temperature of said anhydride whereby impure liquid anhydride is withdrawn as a water free liquid and charged to a step of heating with alkali metal hydroxide to remove phthalide and then fractionated to remove benzoic acid as a first fraction, high purity phthalic anhydride as a second fraction and materials boiling higher than the anhydride as a liquid third fraction.
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.
Horsfield Sydney G.
Kuhlmann George E.
Palmer David A.
Schroeder Hobe
Ahlers Fred R.
Magidson William H.
McClain William T.
Raymond Richard
Standard Oil Company (Indiana)
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