A process for the recovery of lactic acid esters and amides...

C - Chemistry – Metallurgy – 07 – C

Patent

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C07C 51/47 (2006.01) C07C 51/48 (2006.01) C07C 67/08 (2006.01) C07C 69/68 (2006.01) C07C 231/02 (2006.01)

Patent

CA 2268311

The invention provides a process for the recovery of purified lactic acid values from an aqueous feed solution containing lactic acid. lactic acid salt, or mixtures thereof, comprising: bringing the feed solution into contact with a substantially immiscible anion exchanger to form a substantially water-immiscible phase comprising an anion exchanger- lactic acid adduct; effecting a condensation reaction in the substantially water-immiscible phase between a carboxylic moiety of the lactic acid adduct and a moiety selected from a hydroxyl moiety and a primary or secondary amine moiety to respectively form a lactic acid ester or amine product: and separating the formed lactic acid product from the anion exchanger.

L'invention porte sur un procédé de récupération de valeurs d'acide lactique purifié à partir d'une solution aqueuse à traiter contenant de l'acide lactique, de sel d'acide lactique ou des mélanges de ceux-ci. Ce procédé consiste à: mettre la solution à traiter en contact avec un échangeur d'anions pratiquement immiscible de façon à obtenir une phase pratiquement immiscible dans l'eau comprenant un échangeur d'anions-un produit d'addition d'acide lactique; effectuer une réaction de condensation dans la phase pratiquement immiscible dans l'eau entre une fraction carboxylique du produit d'addition d'acide lactique et une fraction sélectionnée à partir d'une fraction hydroxyle et une fraction d'amine primaire ou secondaire de façon à obtenir respectivement un ester d'acide lactique ou un produit d'amine; et séparer le produit d'acide lactique obtenu à partir de l'échangeur d'anions.

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