SIMULTANEOUS ION-EXCHANGE AND ADSORPTION OF LACTIC-ACID ON D354 RESIN

From a number of ion-exchange resins and adsorbents, a macro-pore weak -base type anion ion-exchange resin, D354, was selected for the separa tion of lactic acid. Experimental data showed that simultaneous ion-ex change and physical adsorption existed in the lactic acid-D354 system. A mathematical model was suggested to simulate the experimental data. Also, the effects of inorganic salts on the ion-exchange, equilibrium were studied. The difference in ion-exchange equilibrium between DL-a nd L-lactic acid was observed.