(723o) Membrane Extraction in Cross-Flow Rectangular Modules with Reflux for Improved Performance
AIChE Annual Meeting
2008
2008 Annual Meeting
Separations Division
Poster Session: Membranes
Thursday, November 20, 2008 - 6:00pm to 8:30pm
Application of recycle to the design and operation of a mass or heat transfer equipment can effectively enhance the effects on mass or heat transfer, leading to improved performance . The effect of internal reflux in the raffinate phase for membrane extraction through a cross-flow rectangular module was investigated. Theoretical analysis of mass transfer in cross-flow devices with or without recycle was analogous to heat transfer in cross-flow heat exchangers. In contrast to a device without reflux, considerable improvement in mass transfer is achievable if cross-flow membrane extractors are operated with reflux which provides the increase of fluid velocity, resulting in reduction of mass-transfer resistance. It is concluded that reflux can enhance mass transfer, especially for large flow rate and feed-concentration solution operated under high reflux ratio.