中空纤维

Abstract(#br)This work revolves around the use of porous metal hollow fibers in membrane distillation. Various stages are covered, starting from membrane synthesis up to the testing of a pilot scale membrane module. Mechanically stable metal hollow fibers have been synthesized by phase inversion of a stainless steel particle loaded polymer solution, followed by thermal treatment to remove the polymer and sinter the particles together. The pore surface of the metal fibers has been made hydrophobic by functionalization with polydimethylsiloxane or stearic acid.

Abstract(#br)This study aimed to improve surface polarity of polydimethylsiloxane (PDMS) membranes and provide surface active sites which were easy to react with other chemicals. 3-Aminopropyltriethoxysilane (APTES) containing an amino group was introduced into a PDMS membrane by crosslinking to prepare polyacrylonitrile hollow fiber-supported PDMS membranes with an amino-functionalized surface. Fourier transform infrared and X-ray photoelectron spectroscopic analyses proved the existence of APTES and its amino group in the PDMS membrane.

基于膜技术的烟气中CO2分离在最近几十年受到了极大的关注。本工作采用干喷-湿法纺丝技术制备了聚醚酰亚胺( PEI )中空纤维。随后，在PEI中空纤维外表面浸渍涂复聚二甲基硅氧烷( PDMS )选择性层制备了复合中空纤维膜。对各种纺丝条件纺制的中空纤维进行了充分的表征。通过气体透过率和理想选择性评价了中空纤维基材对PDMS / PEI复合膜CO2 / N2分离性能的影响。所制备的中空纤维基材由20wt %的纺丝液、12 m L / min的孔液(水)流速纺制的复合膜具有最高的理想选择性，达到21.3，CO2透过率为59 GPU。研究发现，dope浓度、膛内流体流速和膛内流体组成等因素影响中空纤维的多孔结构、表面形貌和尺寸。井筒流体组成显著影响PDMS / PEI复合膜的气体透过性和理想选择性。制备的PDMS / PEI复合膜具有与文献报道相当的CO2 / N2分离性能。

基于膜技术的烟气中CO2分离在最近几十年受到了极大的关注。本工作采用干喷-湿法纺丝技术制备了聚醚酰亚胺( PEI )中空纤维。随后，在PEI中空纤维外表面浸渍涂复聚二甲基硅氧烷( PDMS )选择性层制备了复合中空纤维膜。对各种纺丝条件纺制的中空纤维进行了充分的表征。通过气体透过率和理想选择性评价了中空纤维基材对PDMS / PEI复合膜CO2 / N2分离性能的影响。所制备的中空纤维基材由20wt %的纺丝液、12 m L / min的孔液(水)流速纺制的复合膜具有最高的理想选择性，达到21.3，CO2透过率为59 GPU。研究发现，dope浓度、膛内流体流速和膛内流体组成等因素影响中空纤维的多孔结构、表面形貌和尺寸。井筒流体组成显著影响PDMS / PEI复合膜的气体透过性和理想选择性。制备的PDMS / PEI复合膜具有与文献报道相当的CO2 / N2分离性能。