摘要
制备了ＣＡ／ＣＴＡ共混物不对称纳滤膜，膜对单价与多价阴离子能实现有效分离，并能去除小分子有机物．在１ＭＰａ操作压力下，料液温度为１５～２５℃，膜对１０００ｍｇ／Ｌ的ＮａＣｌ水溶液的截留率为１５％～６０％，而对１０００ｍｇ／Ｌ的Ｎａ２ＳＯ４水溶液截留率为８５％～９８％，其透水率在３０～７８Ｌ／（ｃｍ２·ｈ），截留相对分子质量在２００～６００之间．研究了操作条件（压力、料液浓度、温度、膜面流速），不同价态离子（阴离子、阳离子）对膜性能的影响规律．
Good nanofiltration membrane from cellulose acetate and cellulose triacetate blends (CA/CTA)have been prepared by the phase separation technique.The NF membrane can not only effectively separate between monovalent salts and divalent or multivalent salts,but also reject almost all organic compound.Under the conditions of operation pressure about 1MPa and feed temperature from 15 to 25℃,rejection of NaCl solution (1000mg/L) is 15%～60%,and rejection of Na 2SO 4 solution (1 000mg/L)is 85%～98%,and the flux is 30～78L/(cm 2·h).The relative molecular mass cut-off lies in 200～600.Conditions(operation pressure,feed concentration,temperature,feed flow)having effect on membrane performance were studied.Also the structure of membrane surface and cross section were studied by SEM photomicrograph.
出处
《膜科学与技术》
CAS
CSCD
1999年第1期34-39,共6页
Membrane Science and Technology
关键词
共混
纳滤膜
过滤膜
膜分离
CA
CTA
cellulose acetate and cellulose triacetate blends nanofiltration membrane
