Process for preparing lactic acid by evapocrystallization

Details Process for preparing lactic acid by evapocrystallization Process for preparing lactic acid by evapocrystallization

C - Chemistry, Metallurgy

07

C

C07C 59/08 (2006.01) C07C 51/02 (2006.01) C07C 51/43 (2006.01) C12P 7/56 (2006.01)

Patent

CA 2348052

The invention relates to a process for the preparation of high purity lactic acid from an aqueous solution containing said acid in the form of salt(s), characterised in that the aqueous solution is treated with a strong acid in order to liberate lactic acid in the free form and to produce salts of the corresponding strong acid, said salts of the strong acid are crystallised by evaporative crystallisation and lactic acid is recovered in the free form in solution.

L'invention concerne un procédé de préparation d'acide lactique de haute pureté à partir d'une solution aqueuse contenant ledit acide sous forme de sel(s), caractérisé par le fait que l'on traite la solution aqueuse à l'aide d'un acide fort, de manière à libérer l'acide lactique sous forme libre et à générer les sels de l'acide fort correspondant, que l'on cristallise par évapo--cristallisation lesdits sels de l'acide fort et que l'on récupère l'acide lactique sous forme libre en solution.

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