Purification of aqueous solutions of organic acids

Details Purification of aqueous solutions of organic acids Purification of aqueous solutions of organic acids

2011-01-25

2011-01-25

Manoharan, Virginia (Department: 1797)

Distillation: apparatus

Apparatus

Systems

C159S006200, C159SDIG016, C202S191000, C202S236000

Reexamination Certificate

active

07875153

ABSTRACT:
The invention relates to a method and a device for the purification of an aqueous solution of an organic acid having a boiling point at atmospheric pressure of less than 450° C., which-further has approximately 275 g carboxylate ions/1 or less, preferably 250 g carboxylate ions/1 or less, and preferably less than 1% by weight ionic impurities, calculated on the basis of the total solution. In particular, the invention relates to a method and a device for the continuous purification and concentration, on an industrial scale, of an aqueous solution of an organic acid having a boiling point at atmospheric pressure of less than 450° C. According to the method, this solution is subjected to two or more distillation steps, the first distillation step being carried out at a temperature of from 80° to 150° C. and a pressure of from 50 to 250 mbar, and the second distillation step being carried out at a temperature of from 80° to 200° C. and a pressure of from 0.01 to 50 mbar.

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US Office Action on 087258-0202 DTD May 13, 2009.

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