| 摘要 |
<p>Separating and purifying lactic acid (I), from a fermentation medium containing (I) at least partially in salt form, comprising removing the (I)-producing microorganisms, concentrating the clarified solution, acidifying to a pH of 3 or less, and passing the acidified solution through a cation exchange resin to obtain a fraction consisting of free (I) and up to 25 %, by weight of its salts, is new. Separating and purifying lactic acid (I), from a fermentation medium containing (I) at least partially in salt form, comprising removing the (I)-producing microorganisms, concentrating the clarified solution, acidifying to a pH of 3 or less, and passing the acidified solution through a cation exchange resin to obtain a fraction consisting of free (I) and up to 25 %, by weight of its salts, is new. The fraction is subjected to bipolar fractionation electrodialysis to give a (I)-enriched aqueous solution, which purified, and concentrated before recovering (I) from the solution.</p> |
