Process for the purification of 1,10-decanedicarboxylic acid

Details Process for the purification of 1,10-decanedicarboxylic acid Process for the purification of 1,10-decanedicarboxylic acid

1975-04-29

1978-01-10

Bascomb, Jr., Wilbur L.

Distillation: processes, separatory

With chemical reaction

203 31, 203 89, 203 91, 260537P, B01D 310, C07C 5502

Patent

active

040677796

ABSTRACT:
Crude 1,10-decanedicarboxylic acid produced by the nitric acid oxidation at 20.degree.14 60.degree. C. of cyclododecanone, cyclododecanol or a mixture thereof can be purified by distillation to a purity suitable for use in the production of polyamides and polyesters by reducing prior to distillation, e.g., by heating to 70.degree.-90.degree. C., the organically bound nitrogen content and as required the nitric acid content, e.g., by washing, and water content thereof so that the sample which is distilled has maximum contents thereof of 0.05%, 0.02% and 0.1% by weight, respectively, and distilling the pre-purified sample at a sump temperature of 215.degree.-225.degree. C. and at a pressure of 0.5 - 2 torr.

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