Flux enhancement in membrane distillation by fabrication of dual layer hydrophilic-hydrophobic hollow fiber membranes

Sina Bonyadi*, Tai-Shung Chung

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Co-extrusion was applied for the fabrication of dual layer hydrophilic-hydrophobic hollow fibers especially for the direct contact membrane distillation (DCMD) process. The effect of different nonsolvents on the morphology of the PVDF membranes was studied. Weak coagulants such as water/methanol (20/80 wt %) can induce a three-dimensional porous structure on PVDF membranes with high surface and bulk porosities, big pore size, sharp pore size distribution, high surface contact angle, and high permeability but rather weak mechanical properties. Hydrophobic and hydrophilic clay particles were incorporated into the outer and inner layer dope solutions, respectively, to enhance mechanical properties and modify the surface tension properties in the membrane inner and outer layers. The fabricated hollow fibers were evaluated for the DCMD process and flux as high as 55 kg/sq m-hr at 90°C was achieved in the test. This performance was much higher than most of the previous reports, indicating that the application of dual layer hydrophilic-hydrophobic hollow fibers may be a promising approach for MD. This is an abstract of a paper presented at the AIChE Annual Meeting (Salt Lake City, UT 11/4-9/2007).

Original languageEnglish (US)
Title of host publication2007 AIChE Annual Meeting
StatePublished - Dec 1 2007
Event2007 AIChE Annual Meeting - Salt Lake City, UT, United States
Duration: Nov 4 2007Nov 9 2007

Publication series

Name2007 AIChE Annual Meeting

Other

Other2007 AIChE Annual Meeting
CountryUnited States
CitySalt Lake City, UT
Period11/4/0711/9/07

ASJC Scopus subject areas

  • Biotechnology
  • Chemical Engineering(all)
  • Bioengineering
  • Safety, Risk, Reliability and Quality

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