METHOD FOR SEPARATION OF LACTIC ACID COMPONENT FROM LACTIC ACID FERMENTATION LIQUOR, AND SEPARATION APPARATUS

摘要

According to the method of the present invention, a lactic acid component (e.g., lactic acid or oligo (lactic acid)) can be obtained by extraction from a lactic acid fermentation liquor with a pH of 4.8 or less, using at least one solvent selected from the group consisting of toluene, xylene, mesitylene, ethylbenzene, methanol, ethanol, propanol, butanol, and mineral spirit. Furthermore, according to the present invention, oligo (lactic acid) can be obtained, by heating a lactic acid fermentation liquor with a pH of 4.8 or less under reduced pressure, and washing, with water, the fermentation liquor containing a produced oligo (lactic acid). The present invention provides a method for separating a lactic acid component from a lactic acid fermentation liquor, which is free from incorporation of impurities and which includes simple steps.