乙醇水溶液

Abstract(#br)The diffusion behavior of ethanol solutions in polydimethylsiloxane (PDMS) and zeolite-filled PDMS membranes at 298\u003cce:hsp sp=\"0.25\"/\u003eK was investigated. The partial effective diffusion coefficients of the ethanol and water permeants were determined experimentally using the gravimetric method in conjunction with concentration determination on remaining mixtures. The time-resolved sorption levels of ethanol/water binary mixtures in the membranes were measured and partitioned into individual solvent uptakes.

Abstract(#br)The partial pervaporative (PV) fluxes of ethanol/water mixtures in polydimethylsiloxane (PDMS) were predicted using Fick's first law and modified Maxwell–Stefan equation. The sorption levels were predicted using UNIQUAV-HB and the experimental solvent diffusion coefficients of the mixtures were expressed in terms of their sorption concentrations according to Long's model. Both permeant diffusion coefficients were found to vary with the ethanol concentration alone.

Abstract(#br)Sedimentation of silicalite-1 occurs in the fabrication of thin silicalite-1 filled polydimethylsiloxane (PDMS) hybrid composite membranes if the viscosity of membrane solution is low, which makes this preparation challenging. In this work, a new method that use a platinum catalytic agent to assist the pre-polymerization of PDMS polymer to increase the viscosity of the membrane solution was studied.