Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1980-09-11
1982-11-02
Siegel, Alan
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562412, 562486, C07C 5116, C07C 5142
Patent
active
043574750
ABSTRACT:
The reaction mixture obtained by oxidizing p-xylene in the presence of water as diluent, at a temperature comprised between 140.degree. and 220.degree. C., and consisting of terephthalic acid crystals in suspension in an aqueous solution comprising unreacted p-xylene, intermediate oxidation products thereof, the heavy-metal catalyst and water is introduced in the upper part of a sedimentation column wherein the acid is separated by gravity and is washed with a counter current of water introduced near the bottom of said column, the temperature of the washing zone being higher than the minimum value T.sub.w given by the equation T.sub.w =144+0.225 T.sub.R, wherein T.sub.R is the oxidation temperature.
REFERENCES:
patent: 3637829 (1972-01-01), Kerr
patent: 3850983 (1974-11-01), Park
patent: 3865870 (1975-02-01), Cronauer et al.
patent: 4268690 (1981-05-01), Komatsu et al.
Dauby Jacques F.
Hanotier Jacques D.
Labofina S.A.
Siegel Alan
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