Preparation of hollow fibre membranes from PVDF/PVP blends and their application in VMD

Abstract Microporous hydrophobic poly(vinylidene fluoride) (PVDF) hollow fibres were prepared by the dry–wet spinning technique. N,N-Dimethylformamide (DMF) was used as solvent, while water and poly(vinyl pyrrolidone) (PVP) were used as pore forming additives. Mixtures of DMF or ethanol in water were employed as bore fluids. The influence of different parameters on the fibres characteristics was explored. Particular attention was focused on the PVP concentration and on the composition of the bore fluid. The obtained fibres exhibit good structure, excellent mechanical properties, high porosity (up to 80%) and an average pore size ranging from 0.12 to 0.27 μm. Fibres were tested in vacuum membrane distillation (VMD) configuration, using distilled water as feed. The effect of membrane properties on the water vapor fluxes was investigated. For the prepared membranes, the measured fluxes ranged between 3.5 and 18 kg/m 2  h at 50 °C and 20 mbar vacuum pressure. Some selected fibres were assessed for long term stability. Constant performances were observed up to 2 months. Furthermore, preliminary VMD tests on salty water were also performed, in order to verify fibres suitability for seawater desalination.

[1]  J. M. Zárate,et al.  Characterization of membrane distillation membranes prepared by phase inversion , 1995 .

[2]  Mohamed Khayet,et al.  A framework for better understanding membrane distillation separation process , 2006 .

[3]  Mark R. Wiesner,et al.  Surface modification of nanostructured ceramic membranes for direct contact membrane distillation , 2009 .

[4]  C. A. Smolders,et al.  MASS TRANSFER AND THERMODYNAMICS DURING IMMERSION PRECIPITATION FOR A TWO-POLYMER SYSTEM : EVALUATION WITH THE SYSTEM PES-PVP-NMP-WATER , 1994 .

[5]  Kai Yu Wang,et al.  Mixed Matrix PVDF Hollow Fiber Membranes with Nanoscale Pores for Desalination through Direct Contact Membrane Distillation , 2009 .

[6]  Huajiang Huang,et al.  A review of separation technologies in current and future biorefineries , 2008 .

[7]  Baoli Shi,et al.  Preparation and properties of microporous membrane from poly(vinylidene fluoride-co-tetrafluoroethylene) (F2.4) for membrane distillation , 2004 .

[8]  Mohamed Khayet,et al.  Application of surface modifying macromolecules for the preparation of membranes for membrane distillation , 2003 .

[9]  Mohamed Khayet,et al.  Preparation and characterization of polyvinylidene fluoride hollow fiber membranes for ultrafiltration , 2002 .

[10]  Jiping Xu,et al.  Plasma polymerization of octafluorocyclobutane and hydrophobic microporous composite membranes for membrane distillation , 1992 .

[11]  Zhi‐Kang Xu,et al.  Leaching of PVP from polyacrylonitrile/PVP blending membranes: A comparative study of asymmetric and dense membranes , 2006 .

[12]  Gustavo Capannelli,et al.  Effect of coagulation medium on properties of sulfonated polyvinylidene fluoride membranes , 1985 .

[13]  Zhi-Ping Zhao,et al.  Concentration of ginseng extracts aqueous solution by vacuum membrane distillation. 1. Effects of operating conditions , 2008 .

[14]  M. Qtaishat,et al.  Novel porous composite hydrophobic/hydrophilic polysulfone membranes for desalination by direct contact membrane distillation , 2009 .

[15]  Yoshishige Fujii,et al.  Selectivity and characteristics of direct contact membrane distillation type experiment. I. Permeability and selectivity through dried hydrophobic fine porous membranes , 1992 .

[16]  Jiping Xu,et al.  Surface-modified hydrophilic membranes in membrane distillation☆ , 1992 .

[17]  E. Drioli,et al.  MEMBRANE DISTILLATION , 2012 .

[18]  Matthias Rommel,et al.  Solar thermal-driven desalination plants based on membrane distillation☆ , 2003 .

[19]  Enrico Drioli,et al.  Evaluation of energy requirements in membrane distillation , 2008 .

[20]  Fawzi Banat,et al.  Desalination by vacuum membrane distillation: sensitivity analysis , 2003 .

[21]  D. Hou,et al.  Fabrication and characterization of hydrophobic PVDF hollow fiber membranes for desalination through direct contact membrane distillation , 2009 .

[22]  Remko M. Boom,et al.  Microstructures in phase-inversion membranes. Part I. Formation of macrovoids , 1992 .

[23]  E. Drioli,et al.  Membrane Distillation and Related Operations—A Review , 2005 .

[24]  Wojciech Kujawski,et al.  Application of fluoroalkylsilanes (FAS) grafted ceramic membranes in membrane distillation process of NaCl solutions , 2006 .

[25]  M. Qtaishat,et al.  Concentration of sucrose solutions via vacuum membrane distillation , 2006 .

[26]  Kai Yu Wang,et al.  Macrovoid evolution and critical factors to form macrovoid-free hollow fiber membranes , 2008, Hollow Fiber Membranes.

[27]  Kang Li,et al.  Preparation of PVDF hollow-fiber membranes via immersion precipitation , 2001 .

[28]  Kai Yu Wang,et al.  Hydrophobic PVDF hollow fiber membranes with narrow pore size distribution and ultra-thin skin for the fresh water production through membrane distillation , 2008 .

[29]  Mohamed Khayet,et al.  Application of vacuum membrane distillation for ammonia removal , 2007 .

[30]  Fawzi Banat,et al.  Removal of benzene traces from contaminated water by vacuum membrane distillation , 1996 .

[31]  Rafiqul Gani,et al.  Modeling and analysis of vacuum membrane distillation for the recovery of volatile aroma compounds from black currant juice , 2008 .

[32]  Jens Abildskov,et al.  The use of VMD data/model to test different thermodynamic models for vapour-liquid equilibrium , 2004 .

[33]  Jingli Xu,et al.  Air-sweep vacuum membrane distillation using fine silicone, rubber, hollow-fiber membranes , 2006 .

[34]  Sina Bonyadi,et al.  Flux enhancement in membrane distillation by fabrication of dual layer hydrophilic–hydrophobic hollow fiber membranes , 2007 .

[35]  Juin-Yih Lai,et al.  Fabrication of a high hydrophobic PVDF membrane via nonsolvent induced phase separation , 2008 .

[36]  Pierre Aimar,et al.  Experimental study of the effects of hypochlorite on polysulfone membrane properties , 2006 .

[37]  Takeshi Matsuura,et al.  Preparation and Characterization of Polyvinylidene Fluoride Membranes for Membrane Distillation , 2001 .

[38]  Mohamed Khayet,et al.  Porous hydrophobic/hydrophilic composite membranes: Application in desalination using direct contact membrane distillation , 2005 .

[39]  Ye Li,et al.  Hollow fiber ultrafiltration membranes made from blends of PAN and PVP , 2004 .

[40]  Zhao Jin,et al.  Removal of 2,4-dichlorophenol from wasterwater by vacuum membrane distillation using hydrophobic PPESK hollow hiber membrane , 2007 .

[41]  J. Qin,et al.  Development of high flux polyethersulfone hollow fiber ultrafiltration membranes from a low critical solution temperature dope via hypochlorite treatment , 2005 .

[42]  M. Tomaszewska,et al.  Preparation and properties of flat-sheet membranes from poly(vinylidene fluoride) for membrane distillation , 1996 .

[43]  Kamalesh K. Sirkar,et al.  Novel membrane and device for vacuum membrane distillation-based desalination process , 2005 .

[44]  Bing Wu,et al.  Removal of 1,1,1-trichloroethane from water using a polyvinylidene fluoride hollow fiber membrane module: Vacuum membrane distillation operation , 2006 .

[45]  E. Drioli,et al.  Morphology and transport property control of modified poly(ether ether ketone) (PEEKWC) hollow fiber membranes prepared from PEEKWC/PVP blends: influence of the relative humidity in the air gap , 2005 .

[46]  Bumsuk Jung,et al.  Effect of molecular weight of polymeric additives on formation, permeation properties and hypochlorite treatment of asymmetric polyacrylonitrile membranes , 2004 .

[47]  Kang Li,et al.  Preparation and characterization of polyvinylidene fluoride (PVDF) hollow fiber membranes , 1999 .

[48]  Toraj Mohammadi,et al.  Concentration of l-lysine monohydrochloride (l-lysine–HCl) syrup using vacuum membrane distillation , 2006 .

[49]  Seeram Ramakrishna,et al.  Production of drinking water from saline water by air-gap membrane distillation using polyvinylidene fluoride nanofiber membrane , 2008 .

[50]  Zhao Jin,et al.  Hydrophobic modification of poly（phthalazinone ether sulfone ketone） hollow fiber membrane for vacuum membrane distillation , 2008 .

[51]  Tai‐Shung Chung,et al.  Membrane distillation with hydrophobic macrovoid-free PVDF–PTFE hollow fiber membranes , 2009 .

[52]  E Drioli,et al.  Treatment of dye solutions by vacuum membrane distillation. , 2008, Water research.

[53]  Kune-Woo Lee,et al.  Trade-off between thermodynamic enhancement and kinetic hindrance during phase inversion in the preparation of polysulfone membranes , 2003 .

[54]  Mohamed Khayet,et al.  Characterization of membranes for membrane distillation by atomic force microscopy and estimation of their water vapor transfer coefficients in vacuum membrane distillation process , 2004 .

[55]  M. Qtaishat,et al.  Preparation and characterization of novel hydrophobic/hydrophilic polyetherimide composite membranes for desalination by direct contact membrane distillation , 2009 .

[56]  Sina Bonyadi,et al.  Highly porous and macrovoid-free PVDF hollow fiber membranes for membrane distillation by a solvent-dope solution co-extrusion approach , 2009 .

[57]  Yoshinari Fusaoka,et al.  Selectivity and characteristics of direct contact membrane distillation type experiment. II. Membrane treatment and selectivity increase , 1992 .

[58]  C. A. Smolders,et al.  Chemical treatment of membranes of a polymer blend: Mechanism of the reaction of hypochlorite with poly(vinyl pyrrolidone) , 1995 .

[59]  Morteza Akbarabadi,et al.  SEPARATION OF ETHYLENE GLYCOL SOLUTION BY VACUUM MEMBRANE DISTILLATION (VMD) , 2005 .

[60]  L. Hong,et al.  Surface phase morphology and composition of the casting films of PVDF–PVP blend , 2002 .

[61]  Kang Li,et al.  Preparation and characterization of poly(vinylidene fluoride) hollow fiber membranes for vacuum membrane distillation , 2007 .

[62]  Ying Xu,et al.  Pilot test of vacuum membrane distillation for seawater desalination on a ship , 2006 .

[63]  E. Drioli,et al.  Potential of membrane distillation in seawater desalination: Thermal efficiency, sensitivity study and cost estimation , 2008 .

[64]  P. Sukitpaneenit,et al.  Molecular elucidation of morphology and mechanical properties of PVDF hollow fiber membranes from aspects of phase inversion, crystallization and rheology , 2009 .

[65]  Myeong-Jin Han,et al.  Thermodynamic and rheological variation in polysulfone solution by PVP and its effect in the preparation of phase inversion membrane , 2002 .

[66]  M. Qtaishat,et al.  Treatment of waters colored with methylene blue dye by vacuum membrane distillation , 2005 .

[67]  Suhas P. Deshmukh,et al.  Effect of ethanol composition in water coagulation bath on morphology of PVDF hollow fibre membranes , 1998 .

[68]  C. Cabassud,et al.  Membrane distillation for water desalination: how to chose an appropriate membrane? , 2003 .

[69]  C. A. Smolders,et al.  Microstructures in phase inversion membranes. Part II. The role of a polymeric additive , 1992 .