Chemistry of carbon compounds – Miscellaneous organic carbon compounds – C-metal
Patent
1975-06-17
1977-07-05
Thomas, Jr., James O.
Chemistry of carbon compounds
Miscellaneous organic carbon compounds
C-metal
260515R, C07C 6314, C07C 6306
Patent
active
040340058
ABSTRACT:
A process for making an aromatic carboxylic acid of high purity by feeding an essentially equilibrium hydrolysis mixture of an aromatic nitrile to a reactive distillation column operated at a temperature of from about 200.degree. C. to about 325.degree. C. at autogenous pressure where the equilibrium mixture is subjected simultaneously to further hydrolysis and distillation of ammonia, removing water vapor and ammonia from the top of the column, subjecting remaining equilibrium hydrolysis mixture to further hydrolysis and distillation in a reboiler, returning vapor from the reboiler to the distillation column, removing an aqueous solution of product acid from the reboiler, cooling said separated solution, separating acid product, and in order to improve product purity, returning the aqueous filtrate from said separated acid product to a lower portion of said column. In one embodiment of the invention the hydrolysis mixture is obtained by subjecting a nitrile from the ammoxidation of an alkyl aromatic compound to aqueous hydrolysis in a closed reactor at about 200.degree. to about 325.degree. C. until an essentially complete equilibrium is obtained.
REFERENCES:
patent: 3031500 (1962-04-01), Gasson et al.
patent: 3113964 (1963-12-01), Farkas et al.
patent: 3781343 (1973-12-01), Norton
Weissberger, Distillation, Technique of Organic Chem., vol. 4, Interscience Pub. Inc., N.Y., N.Y., pp. 175-178 (1951).
Weissberger, Distillation, Technique of Organic Chem., vol. 4, Interscience Pub. Inc. N.Y., N.Y., pp. 712-713 (1965).
Weissberger, Separation & Purification, pt.1, Interscience Pub. Inc., N.Y., N.Y., pp. 719-722 (1956).
Hancock, II Allen W.
Vanderwerff William D.
Breitenstein G. T.
Hess J. Edward
Johnson Donald R.
Lipsitz Paul
Sun Ventures, Inc.
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