C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
C07C 51/47 (2006.01) C07C 51/48 (2006.01)
Patent
CA 2267419
The invention provides a process for the recovery of lactic acid from aqueous solutions containing at least one water-soluble lactate salt and having a pH of about between 4 and 14, comprising the steps of: contacting said aqueous solution with a cation exchanger which is at least partially in its acid form, said cation exchanger being water immiscible in both acid and salt form, whereby ion exchange is effected, protons are transferred from the cation exchanger to the aqueous solution to acidulate it and to form lactic acid therein and cations from the aqueous solution are bound by the cation exchanger; reacting the cations carrying cation exchanger to convert it into a cation exchanger which is at least partially in its acid form and to a second product, which second product is basic and comprises the cation of the salt; and recovering lactic acid from the lactic acid-containing acidulated aqueous solution by methods known per se.
L'invention porte sur un procédé de récupération de l'acide lactique à partir de solutions aqueuses contenant au moins un sel de lactate soluble dans l'eau et dont le pH est compris entre environ 4 et 14. Ce procéde consiste à mettre le contact la solution aqueuse avec un échangeur cationique qui se présente au moins partiellement sous sa forme acide, l'échangeur cationique étant immiscible dans l'eau à la fois sous sa forme acide et sous sa forme de sel; un échange ionique étant ainsi effectué, les protons sont transférés de l'échangeur cationique à la solution aqueuse de façon à aciduler cette dernière et former l'acide lactique, et les cations issus de la solution aqueuse sont liés par l'échangeur cationique; faire réagir l'échangeur cationique supportant les cations de façon à le convertir en un échangeur cationique qui se présente au moins partiellement sous sa forme acide et en un second produit qui est basique et comprend le cation du sel; et récuperer l'acide lactique à partir de la solution aqueuse acidulée contenant l'acide lactique par des procédés connus en soi.
Elanko-Van Ponnampalam
Eyal Aharon Meir
Cargill Incorporated
Riches Mckenzie & Herbert Llp
LandOfFree
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