Reverse osmosis and pervaporation of organic liquids using organosilica membranes: Performance analysis and predictions

Abstract

This study systematically investigated and modeled the organic solvent reverse osmosis (OSRO) and pervaporation (PV) performances of bis(triethoxysiyl)acetylene (BTESA)‐derived microporous organosilica membranes with different microstructures and permeation properties. BTESA membranes calcined at a low temperature of 100°C exhibited great promise for utility in the challenging OSRO separation of methanol/organic azeotropes such as methanol/toluene and methanol/methyl tert‐butyl ether and demonstrated ultrahigh values for both permeating flux and rejection together with good operation stability. In addition, a generalized solution‐diffusion model enabled a suitable description of the permeation behaviors of organic solvent molecules through the BTESA membranes irrespective of the use of either OSRO or PV modalities, which allowed us to predict the OSRO performance via PV, and vice versa.

Structure–Transport Relationships of Water–Organic Solvent Co-transport in Carbon Molecular Sieve (CMS) Membranes

“…The simplified SD model was also employed to estimate the co-transport of water and p -xylene in CMS membranes in PV systems, and it presents insights into the effect of sweep gas on the membrane downstream. Similar to the RO estimates, the diffusive fluxes of water and p -xylene were calculated by using eq , and the fractional occupancy in the binary mixture system, θ i , binary m , was obtained by using eq .…”

Fabrication of highly permeable PDMS@ZIF‐8/PVDF hollow fiber composite membrane in module for ethanol‐water separation

“…To address this issue, the in situ removal of bioethanol from fermentation broth has been proposed as an effective strategy to improve the fermentation system's productivity 7 . Among various separation techniques, pervaporation (PV) has gained significant attention due to its low energy consumption, high efficiency, and harmlessness to microorganisms 8–15 . In industrial applications, hollow fiber membrane modules have become one of the most important types of membrane modules.…”

“…7 Among various separation techniques, pervaporation (PV) has gained significant attention due to its low energy consumption, high efficiency, and harmlessness to microorganisms. [8][9][10][11][12][13][14][15] In industrial applications, hollow fiber membrane modules have become one of the most important types of membrane modules. They have the advantages such as high packing density, large effective area, and good selfsupporting properties.…”