THE ROLE OF COUPLING IN PERVAPORATION
THE ROLE OF COUPLING IN PERVAPORATION
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DOI：
10.1016/s0376-7388(00)83080-x
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发表时间：
1989-12-01
影响因子：
9.5
通讯作者：
KEDEM, O
中科院分区：
文献类型：
--
作者：
KEDEM, O
在某些渗透蒸发系统中，流动之间的耦合可能起重要作用。具体来说，这似乎适用于水和酒精通过离子交换膜的渗透蒸发。讨论了包含相互阻力系数的输运方程，并描述了该系数的测量方法。结果表明，渗透性较差的物种的凹浓度剖面可能是耦合的结果。偶联可以解释在离子交换膜中观察到的不同浓度的渗透蒸发选择性和吸附选择性之间的密切一致。
In some pervaporation systems coupling between flows may play an important role. Specifically, this appears to apply to the pervaporation of water and alcohol through ion-exchange membranes. Transport equations including a mutual drag coefficient are discussed and a procedure for the measurement of this coefficient is described. It is shown that a concave concentration profile for the less permeable species may be a consequence of coupling. Coupling may explain the close agreement between pervaporation selectivity and sorption selectivity in a range of concentrations observed in ion-exchange membranes.