Recovery of organic acids

Details Recovery of organic acids Recovery of organic acids

C - Chemistry, Metallurgy

07

C

C07C 51/43 (2006.01) C07C 53/08 (2006.01) C12P 7/54 (2006.01)

Patent

CA 2722735

A method is disclosed for the recovery of an organic acid from a dilute salt solution in which the cation of the salt forms an insoluble carbonate salt. An amine and CO2 are introduced to the solution to form the insoluble carbonate salt and a complex between the acid and the amine. The acid/amine complex is thermally dissociated, or "cracked", in the presence of a wa-ter immiscible solvent in which the amine is selectively soluble and in which the acid is not appreciably soluble. The organic acid may then be recovered from the water by any suitable means such as distillation, reactive distillation, extraction, or reactive ex-traction.

L'invention concerne un procédé pour la récupération d'un acide organique à partir d'une solution de sel dilué dans lequel le cation du sel forme un sel carbonate insoluble. Une amine et du CO2 sont introduits dans la solution pour former le sel carbonate insoluble et un complexe entre l'acide et l'amine. Le complexe acide/amine est thermiquement dissocié, ou « craqué », en présence d'un solvant immiscible dans l'eau dans lequel l'amine est sélectivement soluble et dans lequel l'acide n'est pas sensiblement soluble. L'acide organique peut ensuite être récupéré de l'eau par tout moyen approprié tel que la distillation, la distillation réactive, l'extraction ou l'extraction réactive.

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