MASS TRANSFER CONDITION OF CITRIC ACID EXTRACTION BY POLYPROPYLENE SUPPORTING LIQUID MEMBRANE
GUO Chang-zi1, ZHANG Jian-min2(1. College of Resource and Environment, SUST, Xianyang 712081, China;2. College of Environmental and Chemical Engineering, SAUEST, Xi'an 710048, China)
The citric acid was extracted from citric acid solution by polypropylene supporting liquid membrane, and its mass transfer conditions in the technological process were studied. Through orthogonal test, investigation and analysis of influence of feed phase concentration, the optimal conditions are: feed phase concentration 0.4mol/L,counter-extraction phase concentration 0.1mol/L, stirring speed 300r/min, mass transfer temperature 25℃. In addition, a continuous experiment for the membrane system was carried out; it was showed that, under these optimal conditions, the membrane system had better stability, the membrane flux after lowering could be recovered through soaking, and the membrane could be used continuously, providing a theoretical basis for opening up a new way for citric acid production.
【CateGory Index】： TQ021.4