Lactic acid extraction and purification process
AssigneeVogelbusch Gesellschaft m.b.H.
InventorsSchahroch Sarhaddar, Anton Scheibl, Emmerich Berghofer, Adalbert Cramer
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Abstract
The 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.sup.+ form. In a first step, the NH.sub.4 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.sup.+ form.
Claims15
Process for the separation and purification of lactic acid from salt-containing and carbohydrate-containing substrates from a fermentation solution from which coarsely dispersed and lipophilic impurities have been removed, said separation and purification process comprising the steps of:
- a) converting the salts which may be present in the fermentation solution, principally the salt of lactic acid, into free acids by means of genuine ion exchange in one or more "preliminary columns", and
- b) separating the free lactic acid from the rest of the acids, carbohydrates and other impurities present in the fermentation solution by chromatography at strongly acidic ion exchangers in one or more "separation columns".
Dependencies are inferred from the claim text.