Residue treatment process

Details Residue treatment process Residue treatment process

C - Chemistry, Metallurgy

07

C

252/1.C, 260/486

C07C 69/34 (2006.01) B01J 21/00 (2006.01) B01J 23/90 (2006.01) C07C 51/31 (2006.01) C07C 51/493 (2006.01)

Patent

CA 1093049

ABSTRACT OF THE DISCLOSURE In the manufacture of adipic acid by the nitric acid oxidation of a cylcohexanol/cyclohexanone mixture, the spent nitric acid is fortified and recycled for use. Continuous recycling causes a built-up of impurities such as succinic and glutaric acid and catalyst metals. These residues are treated by the process of the invention which comprises mixing the residue in molten form with a C6-C13 alcohol at elevated temperature to effect partial esterifica- tion and to produce an aqueous phase and an organic phase. The phases may then be separated.

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