Process for the purification of decane dicarboxylic acid-(1,10)

Details Process for the purification of decane dicarboxylic acid-(1,10) Process for the purification of decane dicarboxylic acid-(1,10)

C - Chemistry, Metallurgy

07

C

260/533.7

C07C 51/44 (2006.01) C07C 51/487 (2006.01) C08L 63/02 (2006.01)

Patent

CA 1051025

ABSTRACT A process for the purification of decane dicarboxylic acid-(1,10) which has been prepared by oxidation of cyclododecanol and/or cyclodode- canone with nitric acid in the presence or absence of an oxidation catalyst, wherein the content of organically combined nitrogen in the crude decane dicarboxylic acid-(1,10) obtained is decreased to 0.05% by weight or less if greater by treatment under oxidizing conditions, the content of free nitric acid is decreased to 0.02% by weight or less and the content of water is decreased to 0.1% by weight or less, and then the decane dicar- boxylic acid-(1,10) is distilled at a pressure of from 0.5 to 2 torr and at a bottoms temperature of from 215° to 225°C. The acid may be used directly without further purification in the preparation of for example, polyesters and polyamides.

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