Theoretical and Experimental Approaches of Liquid Entry Pressure Determination in Membrane Distillation Processes

• DOI: 10.3311/ppch.2179
• Publication Date: 2014-08-01T08:38:53Z
• Authors: Gábor Rácz; Steffen Kerker; Zoltán Kovács; Gyula Vatai; Mehrdad Ebrahimi; Peter Czermak
• Keywords: Membrane Distillation; Bar (unit)

Membrane distillation (MD) is a thermally driven separation process that employs hydrophobic membrane as barrier forthe liquid phase, allowing only vapor phase to pass through the pores. Wetting of pores by streams (i.e. loss characteristics membranes) crucial issue in MD treatment. This paper organized into two parts. The first part provides an overview theoretical background wetting phenomenon and guides reader experimental techniques presented literature for determining entry pressure (LEP) membranes. In second part, we provide experimentally measured data on LEP values some commercially available hollow-fiber flat-sheet membranes tested our lab using different configurations. LEPw value 020 CP 2N hollow-fibermembrane (Microdyn-Nadir GmbH, Wiesbaden, Germany)made PP found be 0.97 bar direct-contact membranedistillation (DCMD) configuration. DuraporeTM GVPH flat sheet (Merck Millipore Inc., Billerica, USA) made PVDF 2.37±0.025 static measurement technique 1.90 vacuum We also show wetted can successfully regenerated soaking them ethanol removing with evaporation at elevated temperatures. A novel concept regeneration procedures applying have developed been proved effective modules, however, failed recovering module.