Cross-flow ultrafiltration of macromolecular solutions in a module withmicrochannels is expected to have the advantages of fast diffusion from the membranesurface and a high ratio of membrane surface area to feed liquid volume. Cross-flowultrafiltration modules with microchannels are expected to be used for separation andrefining and as membrane reactors in microchemical processes. Though these modules canbe applied as a separator connected with a micro-channel reactor or a membrane reactor,there have been few papers on their performance. The purpose of this study was to clarifythe relationship between operational conditions and performance of cross-flowultrafiltration devices with microchannels. In this study, Poly Vinyl Pyrrolidone (PVP)aqueous solution was used as a model solute of macromolecules such as enzymes.Cross-flow ultrafiltration experiments were carried out under constant pressure conditions,varying other operational conditions. The permeate flux decreased in the beginning of eachexperiment. After enough time passed, the permeate flux reached a constant value. Theperformance of the module was discussed based on the constant values of the flux. It wasobserved that the permeate flux increased with increasing transmembrane pressure (TMP)and feed flow rate, and decreased with an increase of feed liquid concentration. A model ofthe transport phenomena in the feed liquid side channel and the permeation through themembrane was developed based on the concentration and velocity distributions in the feedside channel. The experimental results were compared with those based on the model andthe performance of the ultrafiltration module is discussed.
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