Lactic acid extraction and purification process

摘要

PCT No. PCT/AT94/00016 Sec. 371 Date Oct. 10, 1995 Sec. 102(e) Date Oct. 10, 1995 PCT Filed Feb. 17, 1994 PCT Pub. No. WO94/19307 PCT Pub. Date Sep. 1, 1994The subject of the invention is a process for extracting pure lactic acid from fermentation liquors by ion exchange chromatography on a strongly acidic cation exchanger, preferably in H+ form. In a first step, the NH4 lactate coming from the fermentation is converted into the free acid by genuine ion exchange. This conversion is preferably effected on a weakly acidic cation exchanger in H+ form.