C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/44 (2006.01) C07C 51/43 (2006.01) C07C 55/14 (2006.01)
Patent
CA 2062142
This invention relates to a process for the recovery of adipic acid from mother liquors collected during commercial production of adipic acid, wherein said mother liquors contain from 52 to 60% by weight of nitric acid calculated as HNO3, not taking into account the organic constituents, from 2 to 6% by weight of succinic acid, from 4 to 9% by weight of glutaric acid, and from 5 to 10% by weight of adipic acid, by selective crystallization of the adipic acid dissolved in said mother liquors by (a) adding an aqueous adipic acid solution having an adipic acid content of from 0.5 to 6% by weight to said mother liquor in the temperature range of from 30 to 60°C in such a quantity that the concentration of nitric acid in the mixture is reduced to 35 to 50% by weight; (b) cooling the mixture by at least 5 degrees Celsius within a period of from 0.5 to 5 hours to induce crystallization of the adipic acid; (c) isolating the crystallized adipic acid by filtration; and (d) transferring the filtrate obtained in step (c) to a distillation apparatus for distillative workup of the glutaric acid contained therein.
Steinhoff Georg
Vogtel Peter
Aktiengesellschaft Bayer
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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