CO2 and H2 selectivity properties of PDMS/PSf membrane prepared at different conditions
Tóm tắt
The effects of different solvent/water coagulation mediums, different coagulation bath temperatures (CBT) and different coagulants on the performance, morphology and thermal stability of polysulfone membranes were investigated. The CO2/CH4, H2/CH4 and H2/N2 separation performance of the membranes were studied by gas permeation. Changing the N,N-dimethyl acetamide (DMAc)/water coagulation medium ratio from pure water to 90/10 vol%, resulted in a complete disappearance of the macrovoids throughout the polysulfone (PSf) polymeric matrix. The PSf membrane prepared in a CBT of 25°C showed the best gas separation performance with ideal selectivities of 46.29, 39.81 and 51.02 for H2/CH4, CO2/CH4 and H2/N2 respectively, and permeances of 25 and 21.5 GPU for H2 and CO2 at 25°C and 10 bar respectively. By increasing the amount of solvent in the gelation bath, the selectivities of H2/CH4, CO2 /CH4 and H2/N2 were dramatically reduced from 46.29, 39.81 and 51.02 to 16.08, 20.2 and 18.5 respectively at 25°C and 10 bar. Reducing the CBT from 80°C to 5°C led to a complete elimination of macrovoids. Using methanol as a coagulant resulted in a less selective membrane compared with membranes from ethanol and water coagulants. The H2 and CO2 permeances were respectively about 3 and 9 times more than those for ethanol and water coagulants. Coated membranes were heated at different temperatures to investigate the suppression of undesirable CO2 plasticization. The membranes were stabilized against CO2 plasticization by a heat-treatment process.
Tài liệu tham khảo
Baker R W. Membrane Technology and Application. 2nd ed. New York: Wiley J, 2004, 301–349
Bhide B D, Stern S A. Membrane processes for the removal of acid gases from natural gas. I. Process configurations and optimization of operating conditions. Journal of Membrane Science, 1993, 81(3): 209–237
Bhide B D, Stern S A. Membrane processes for the removal of acid gases from natural gas. II. Effects of operating conditions, economic parameters and membrane properties. Journal of Membrane Science, 1993, 81(3): 239–252
MacLean D L, Bollinger W A, King D E, Narayan R S. Gas Separation Design with Membranes, in Recent Developments in Separation Science. Boca Raton, FL: CRC Press, 1986, 9–14
Gardner R G, Crane R A, Hannan J F. Hollow fiber permeator for separating gases. Chemical Engineering Progress, 1977, 73: 76–78
Chung T S, Shieh J J, Lau W W Y, Srinivasan M P, Paul B D. Fabrication of multi-layer composite hollow fiber membranes for gas separation. Journal of Membrane Science, 1999, 152(2): 211–225
Liu L, Chakma A, Feng X. Preparation of hollow fiber poly(ether block amide)/polysulfone composite membranes for separation of carbon dioxide from nitrogen. Chemical Engineering Journal, 2004, 105(1–2): 43–51
Du R H, Feng X S, Chakma A. Poly(N,N-dimethylaminothyl methacry late)/polysulfone composite membranes for gas separation. Journal of Membrane Science, 2006, 279(1–2): 76–85
Brandrup J, Immergut E H, Grulke E A. Polymer Handbook. 4th ed. New York: Wiley Interscience, 1999, 100–105
Kapantaidakis G C, Kaldis S P, Dabou X S, Sakellaropoulos G P. Gas permeation through PSF-PI miscible blend membranes. Journal of Membrane Science, 1996, 110(2): 239–247
Marchese J, Ochoa N, Pagliero C. Preparation and gas separation performance of silicone-coated polysulfone membranes. Journal of Chemical Technology and Biotechnology (Oxford, Oxfordshire), 1995, 63(4): 329–336
Peng F, Liu J, Li J. Analysis of the gas transport performance through PDMS/PS composite membranes using the resistances-inseries model. Journal of Membrane Science, 2003, 222(1–2): 225–234
Ahn J, Jin Chung W, Pinnau I, Guiver D M. Polysulfone/silica nanoparticle mixed-matrix membranes for gas separation. Journal of Membrane Science, 2008, 314(1–2): 123–133
Weng T H, Tseng H H, Wey M Y. Preparation and characterization of multi-walled carbon nanotube/PBNPI nanocomposite membrane for H2/CH4 separation. International Journal of Hydrogen Energy, 2009, 34(20): 8707–8715
Shao L, Chung T S. In situ fabrication of cross-linked PEO/silica reverse-selective membranes for hydrogen purification. International Journal of Hydrogen Energy, 2009, 34(15): 6492–6504
Shao L, Liu L, Cheng S, Huang Y, Ma J. Comparison of diamino cross-linking in different polyimide solutions and membranes by precipitation observation and gas transport. Journal of Membrane Science, 2008, 312(1–2): 174–185
Shao L, Chung T, Goh S, Pramoda K. The effects of 1,3-cyclohexanebis(methylamine) modification on gas transport and plasticization resistance of polyimide membranes. Journal of Membrane Science, 2005, 267(1–2): 78–89
Shao L, Chung T S, Pramoda K P. The evolution of physicochemical and transport properties of 6FDA-durene toward carbon membranes; from polymer, intermediate to carbon. Microporous and Mesoporous Materials, 2005, 84(1–3): 59–68
Stropnik C, Kaiser V. Polymeric membranes preparation by wet phase separation: mechanisms and elementary processes. Desalination, 2002, 145(1–3): 1–10
Aroon M A, Ismail A F, Montazer-Rahmati M M, Matsuura T. Morphology and permeation properties of polysulfone membranes for gas separation: effects of non-solvent additives and co-solvent. Separation and Purification Technology, 2010, 72(2): 194–202
Amirilargani M, Saljoughi E, Mohammadi T. Effects of Tween 80 concentration as a surfactant additive on morphology and permeability of flat sheet polyethersulfone (PES) membranes. Desalination, 2009, 249(2): 837–842
Moon J H, Bae J H, Bae Y S, Chung J T, Lee C H. Hydrogen separation from reforming gas using organic templating silica/alumina composite membrane. Journal of Membrane Science, 2008, 318(1–2): 45–55
Kim J Y, Lee H K, Baik K J, Kim S C. Liquid-liquid phase separation in polysulfone/solvent/water systems. Journal of Applied Polymer Science, 1997, 65(13): 2643–2653
Kim J Y, Kim Y D, Kanamori T, Lee H K, Baik K J, Kim S C. Vitrification phenomena in polysulfone/NMP/water system. Journal of Applied Polymer Science, 1999, 71(3): 431–438
Wijmans J G, Baaij J P B, Smolders C A. The mechanism of formation of microporous or skinned membranes produced by immersion precipitation. Journal of Membrane Science, 1983, 14(3): 263–274
Reuvers A J, Smolders C A. Formation of membranes by means of immersion precipitation. Part II: The mechanism of formation of membranes prepared from the system cellulose acetate-acetonewater. Journal of Membrane Science, 1987, 34(1): 67–86
Han M J, Nam S T. Thermodynamic and rheological variation in polysulfone solution by PVP and its effect in the preparation of phase inversion membrane. Journal of Membrane Science, 2002, 202(1–2): 55–61
Barzin J, Madaeni S, Mirzadeh S H. Effect of preparation conditions on morphology and performance of hemodialysis membranes prepared from polyethersulfone and polyvinylpyrrolidone. Iranian Polymer Journal, 2005, 14: 353–370
Smolders C A, Reuvers A J, Boom R M, Wienk I M. Microstructures in phase inversion membranes. Part I: Formation of macrovoids. Journal of Membrane Science, 1992, 73(2–3): 259–275
Andrew W. Permeability and Other Film Properties of Plastics and Elastomers. In: Plastics Design Library. New York: Norwich, 1995, 58–60
Yampolskii Y, Pinnau I, Freeman B D. Materials Science of Membranes for Gas and Vapor Separation. Chichester: Wiley, 2006, 271–280
Liu Y, Wang R, Chung T S. Chemical cross-linking modification of polyimide membranes for gas separation. Journal of Membrane Science, 2001, 189(2): 231–239
Bos A, Punt I G M, Wessling M, Strathmann H. CO2-induced plasticization phenomena in glassy polymer. Journal of Membrane Science, 1999, 155(1): 67–78
Bos A, Punt I G M, Wessling M, Strathmann H. Plasticization resistant glassy polyimide membranes for high pressure CO2/CH4 separations. Separation and Purification Technology, 1998, 14(1–3): 27–39