Recovery of dicarboxylic acids from aqueous solution containing

Details Recovery of dicarboxylic acids from aqueous solution containing Recovery of dicarboxylic acids from aqueous solution containing

1975-08-11

1977-03-29

Bernstein, Hiram H.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

203 79, 203 91, 203 96, 260537R, 2603468R, B01D 338

Patent

active

040149030

ABSTRACT:
A process for treating an adipic acid bleed stream obtained in the manufacture of adipic acid, said adipic acid bleed stream consisting mainly of nitric, adipic, glutaric, and succinic acids and a catalyst; the process comprising maintaining said adipic acid bleed stream in aqueous solution, and stripping nitric acid from said aqueous solution with steam at a temperature of about 100.degree.-110.degree. C. while maintaining in said aqueous solution a water to nitric acid weight ratio of at least 6, to remove substantially all of the nitric acid therefrom, thereby forming an aqueous nitric acid free mixture of said dibasic acids and said catalyst which can be safely dehydrated and distilled to produce useful chemicals.

REFERENCES:
patent: 3354056 (1967-11-01), Wegerich
patent: 3359283 (1967-12-01), Campbell
patent: 3657280 (1972-04-01), Lese
patent: 3758564 (1973-09-01), Davis

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