Mass transfer simulation on pervaporation dehydration of ethanol through hollow fiber NaA zeolite membranes

Abstract

A multi-layer series-resistance mass transfer model was developed to simulate mass transfer behaviors of water/ethanol mixture through hollow fiber NaA zeolite membranes. The mass transfer through zeolite layer was described by Maxwell-Stefan mechanism based on adsorption and diffusion parameters obtained from molecular simulation. The mass transfer through asymmetric hollow fiber support was described by dusty gas model involving Knudsen diffusion and viscous flow. It was found that the sponge-like layer of support besides of zeolite layer made an important contribution to overall membrane transfer resistance while the finger-like layer had less effect. When permeate pressure shifted from 0.2 to 7.5 kPa, the mass transfer resistance contribution of sponge-like layer varied from 27.1 to 17.8%. Effects of microstructure parameters of support on mass transfer through membrane were investigated extensively. Large pore size and thin thickness for sponge-like layer of support were beneficial to improve water permeation flux.

Surface-modified silicalite-1-filled PDMS membranes for pervaporation dehydration of trichloroethylene

“…Consequently, there is an augmented contact between TCE and the composite membrane, promoting the interaction between the membrane and TCE, which further enhances the permeation of the permeation component. 39…”

Review: membrane materials for the removal of water from industrial solvents by pervaporation and vapor permeation

“…Grain boundary defects that cannot be eliminated through seeding/secondary growth may be addressed via post‐crystallization treatment(s) . The majority of zeolite membranes are in single‐channel tube form, although multichannel tubes and monoliths, as well as hollow fibers, are emerging …”

“…208,213,214 The majority of zeolite membranes are in single-channel tube form, although multichannel tubes and monoliths, as well as hollow fibers, are emerging. 199,[215][216][217][218] Reports of zeolite PV membranes began to appear in the patent and scientific literature several years after polymeric PV membranes. One informal measure of the timing of the emergence of zeolite PV membranes relative to polymeric PV membranes can be found in the papers presented at the International Conference on Pervaporation Processes in the Chemical Industry, a conference held from 1986 through 1995.…”

Mass transfer model, preparation and applications of zeolite membranes for pervaporation dehydration: A review

“…Towards the mass transfer through the hollow fiber NaA zeolite membrane, Ye et al [63] developed a multi-layer series-resistance (MLSR) model to describe pervaporation dehydration of ethanol through hollow fiber NaA zeolite membranes. The membrane was divided into three transfer-resistance regions in series as shown in Fig.…”