Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acids and salts thereof
Patent
1991-02-19
1992-10-27
Shippen, Michael L.
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acids and salts thereof
562486, C07C 6109
Patent
active
051591090
ABSTRACT:
There is provided a method for purifying an organic polycarboxylic acid wherein the amounts of organic monofunctional impurities associated therewith are substantially reduced, which method comprises conducting steam distillation of a stream comprising said polycarboxylic acid. In one embodiment of the method, a reactor effluent comprising a polycarboxylic acid is introduced into a crystallization zone, said effluent being subjected to crystallization and steam distillation coextensively in said crystallization zone.
The method of the present invention may be used suitably to purify 1,4-cyclohexanedicarboxylic acid in a reactor effluent from the hydrogenation of a terephthalic acid by reducing the amounts of 4-methyl-1-cyclohexanecarboxylic acid and cyclohexanecarboxylic acid, as well as other organic impurities, contaminating the dicarboxylic acid.
There is also provided the polycarboxylic acid purified by the method of the present invention.
REFERENCES:
patent: 3835167 (1974-09-01), Pfister
Vogel, "Practical Organic Chemistry," 3rd Ed, pp. 145-149 (1956).
Peterson David A.
Rosen Bruce I.
Amoco Corporation
Blumberg Gunar J.
Magidson William H.
Shippen Michael L.
Sroka Frank J.
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