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It can be expected that a microwave acts as an accelerator of the mobility of polar functional groups such as hydroxyl groups in polymeric membranes, and then gas permeability improves because of the increasing free volume and/or temperature of the membranes. The permeabilit ...
Desalination 145 (2002)
... e.g., hydrofluoric and sulfuric acid may be replaced by less harmful solid catalysts, for example by solid heteropolyacids (“super” acids) or polymeric sulfonic acids. To overcome decrease in catalyst performance by time and to increase product selectivity a membrane reactor approach is suggeste ...
Desalination 144 (2002)
Influence of temperature on anionic surface active agent removal from a water solution by ultrafiltration
... to the solution viscosity decrease and thermal expansion of the membrane material. Keywords: Ultrafiltration; Surfactant; Detergent; Temperature; Polymeric membrane *Corresponding author. Presented at the 2nd Membrane Science and Technology Conference of Visegrad Countries (PERMEA), Polanica Zdroj ...
Desalination 198 (2006)
... exploited the concentration of vitamins and pigments (specifically carotenoids) from crude palm oil using membrane technology. With a flat sheet polymeric membrane (NP10), the red palm ethyl ester flux was 7.5 L m−2 h−1, and the rejection of β-carotene was 75% at the pressure of 2.5 MPa an ...
Desalination 246 (2009)
Trade-off between thermodynamic enhancement and kinetic hindrance during phase inversion in the preparation of polysulfone membranes
... the diffusion-induced phase inversion process from casting solutions consisting of polysulfone, dimethyformamide, and polyvinyl pyrrolidone as a polymeric additive. The effect of PVP added in casting solutions was analyzed by measuring the prepared membranes’ morphology and water permeability.
Desalination 159 (2003)
Polymeric and ceramic membranes in three-phase catalytic membrane reactors for the hydrogenation of methylenecyclohexane
This work investigates the hydrogenation of methylenecyclohexane using catalytic membrane reactors. Flat polymeric (PVDF) and tubular ceramic (γ-Al2O3) membranes were prepared and the hydrogenation catalyst, palladium, was deposited into their porous structur ...
Desalination 144 (2002)