COMPARISON OF THE SEPARATION OF LACTIC-ACID AND L-LEUCINE BY LIQUID EMULSION MEMBRANES

A mass transfer model originally Proposed for the permeation of zinc a nd L-phenylalanine was slightly modified and used for calculating the mass transfer resistances in lactic acid permeation (using the seconda ry amine Amberlite LA-2 as a carrier) and L-leucine permeation (using the quaternary ammoniumchloride Aliquat 336 as a carrier). The results show that under optimized conditions lactic acid permeation is contro lled by the rate of reaction and that L-leucine permeation is controll ed by the rate of reaction and the diffusion through the emulsion glob ule. The model results were compared with batch experiments separating lactic acid and L-leucine from real fermentation broths. The comparis on shows that the separation rate is affected by co-transport of pH re gulating agents and to a smaller extent by the co-transport of water.