渗透蒸发

Abstract(#br)In this work, ceramic hollow fiber supported polydimethylsiloxane (PDMS) composite membranes were developed by dip-coating PDMS layer on the surface of macroporous ceramic hollow fiber support. By controlling the properties of polymer solution and ceramic hollow fiber, high-quality ceramic hollow fiber supported PDMS composite membranes were fabricated for pervaporation (PV) recovery of bio-butanol.

Abstract(#br)Metal–organic frameworks (MOFs) have received much attention in recent years because of their good compatibility with polymer as well as their porous structure that facilitates transport fillers in a polymer matrix. In this study, MIL-53 particles were synthesized and incorporated into polydimethylsiloxane (PDMS) matrix to produce novel MIL-53/PDMS hybrid membrane. The morphologies and structures of MIL-53 particles and their hybrid membranes were characterized by SEM, XRD, FTIR, AFM and contact angle.

Abstract(#br)In recent years, pervaporation has been investigated rigorously for separation of thiophene and its derivatives from the fluid catalytic cracker (FCC) gasoline. Like other membrane-based processes, the scale up and commercialization of this process require the study of the separation performance at the membrane module scale. In this study, a suitable mathematical model is obtained to predict the performance of a spiral wound pervaporative module for the removal of thiophene from n -heptane/thiophene mixtures.

Abstract(#br)We address two major challenges facing commercialization of acetone–butanol–ethanol (ABE) fermentation: product inhibition and low productivity. We studied a polystyrene- b -polydimethylsiloxane- b -polystyrene (SDS) triblock copolymer membrane for selective removal of butanol from aqueous solutions by pervaporation. The SDS membrane exhibited higher permeabilities than a commercially available cross-linked polydimethylsiloxane (PDMS) membrane.

Abstract(#br)Organic/inorganic hybrid membranes for separation applications have been widely studied. However, achieving a uniform dispersion of inorganic fillers in the polymer matrix is a primary challenge in the advancement of mixed-matrix membranes (MMMs). In the present study, a method for in situ assembly enhanced by sonication was developed to prepare hydrophobic polydimethylsiloxane (PDMS)/nanoparticle hybrid membranes.

Abstract(#br)A promising new polydimethylsiloxane (PDMS)/organosilica hybrid membrane has been developed and applied to the removal of sulfur from model gasoline by pervaporation. The introduction of organosilicas derived from bis(triethoxysilyl)ethane (BTESE) into the PDMS matrix led to a simultaneous improvement of permeance and selectivity of the resultant membrane.

Abstract(#br)Separation of ethanol/water mixtures through classical separation methods, like distillation, are very energy consuming. Pervaporation is an alternative membrane separation process with much lower energy demand, but still lacking high performance membranes with sufficient flux-selectivity properties. In this study, polydimethylsiloxane (PDMS) based mixed matrix membranes (MMMs) were developed and their pervaporation performance investigated. The fillers consist of hollow spheres (HS) covered with a shell of silicalite-1 crystals.

Abstract(#br)Batch-wise butanol removal using vacuum pervaporation (VPV) was investigated to assess its technical feasibility for future integration with a continuous PBE (1,3-propanediol-butanol-ethanol) fermentation process using glycerol as feedstock. Two commercial polydimethylsiloxane (PDMS) membrane configurations were characterized using binary model solutions and authentic fermentation broths, while varying feed temperature, butanol concentration and flow rate.

Abstract(#br)Herein, we report a method for the fabrication of an efficient membrane for butanol recovery from dilute aqueous solution using micron-sized particles of surface modified silicalite-1 as macro-crosslinkers within a polydimethylsiloxane (PDMS) matrix. In this work, silicalite-1 of nano- and micron-sized particles were synthesized and surface modified with a range of alkyloxysilanes in the fabrication of mixed matrix membranes (MMMs) in order to minimize the undesirable voids.

Abstract(#br)Polydimethylsiloxane (PDMS) membranes were synthesised by varying the degree of crosslinking and were characterised in a pervaporation system coupled to a mass spectrometry (MS) for on-line monitoring and collecting data points with an interval of 2\u003cce:hsp sp=\"0.25\"/\u003es. This monitoring approach allows obtaining very precise information about the impact of solutes’ solubilisation within the membrane and their influence on solvent permeation.