浓盐溶液的膜蒸馏机理研究  

Study of Membrane Distillation Mechanism for High Concentration NaCl Solution

作　　者：贠延滨[1] 刘丽英[1] 马润宇[1] FaneAG 

机构地区：[1]北京化工大学化学工程学院,北京100029 [2]新南威尔士大学化学工程学院

出　　处：《高校化学工程学报》2002年第4期389-395,共7页Journal of Chemical Engineering of Chinese Universities

基　　金：中澳机构合作项目(Australia-China Institutional Links Program)

摘　　要：考察了高浓度氯化钠溶液在直接接触式膜蒸馏操作中的热侧温度、冷侧温度、流速和料液浓度对膜渗透通量的影响。发现膜渗透通量随氯化钠溶液浓度的升高而降低, 当氯化钠溶液浓度约为25%时,膜渗透通量急剧下降。氯化钠溶液达到饱和时,膜渗透通量逐渐趋于稳定。研究认为此现象是由于膜面上有NaCl结晶形成而导致的。Direct contact membrane distillation (DCMD) experiments were carried out with high concentration NaCl aqueous solution, in which water fluxes were measured at different feed temperatures, permeation temperatures, feed concentrations and flow rates, respectively. Water fluxes decreased as concentration of NaCl solution was increasing. When concentration of NaCl solution was about 25%, water fluxes decreased sharply; while concentration of NaCl solution was up to saturation, water fluxes approached a steady level gradually. The reason for these phenomena might be that NaCl crystallized on the membrane surface.

关 键 词：浓盐溶液 蒸馏机理 膜蒸馏 聚偏氟乙烯微孔膜 传质传热 膜分离 氯化钠溶液 

分 类 号：TQ028.8[化学工程]