The pervaporative desalination of synthetic seawater and brines was studied to explore the water flux salt rejection a thin-film composite (TFC) membrane made polydimethylsiloxane (PDMS) dip-coated on porous polysulfone support. Despite hydrophobic nature rubbery PDMS, we demonstrate that nonporous TFC membranes exhibit remarkable performance as evidenced by very high permeance 99.8 ± 0.2% NaCl...

Pervaporation is considered a clean and energetically efficient process used for a wide range of applications, working separately or integrated nto a hybrid process. In this work, a mathematical model has been developed accounting for the mass transport phenomena under non-isothermal onditions with strong contribution of polarization concentration that prevail in pervaporation systems. The math...

Zeolitic imidazolate frameworks (ZIFs), a subclass of metal organic frameworks, are built of tetrahedral metal ions bridged by imidazolates. They have permanent porosity and relatively high thermal and chemical stability, which make them attractive candidates for many industrial applications. In recent years, significant progress has been made in developing ZIFs into membranes and thin films fo...

Two-ply composite membranes with separation layers from chitosan and sulfoethylcellulose were developed on a microporous support based on poly(diphenylsulfone-N-phenylphthalimide) and investigated by use of X-ray diffraction and scanning electron microscopy methods. The pervaporation properties of the membranes were studied for the separation of aqueous alcohol (ethanol, propan-2-ol) mixtures o...

Acetone, butanol and ethanol were produced in a continuous two-stage fermentation integrated with pervaporation using freely suspended cells of C. acetobutylicum ATCC 824. PDMS composite pervaporation membranes were directly coupled to the second fermentor which lead to decreased solvent titers. Overall productivity was increased from 0.45 g L(-1) h(-1) to 0.88 g L(-1) h(-1) when increasing the...

High-quality chabazite (CHA) zeolite membranes were synthesized from organotemplate-free aluminosilicate gel via epitaxial growth using RHO-type seed layer. Both RHO seeds (Si/Al = 2.4) and the synthetic containing cesium species led to formation of CHA with a high Si/Al ratio 3.0 short synthesis time 12 h. The effects particles crystallization on membrane formation, pervaporation performance, ...

A vibrating membrane module currently marketed for ®ltration applications was evaluated for the separation of volatile organic compounds (VOCs) from aqueous solutions by pervaporation. Preliminary screening experiments with three VOCs, three silicone membranes, and in the presence and absence of a surfactant were performed to determine if further consideration of the vibrating module for a ®eld...

Bu çalışmada, metilal/metanol karışımlarının ayrılması için pervaporasyon işlemi kullanılmıştır. Metanole afinitesinden dolayı membran hazırlamak polieterimid (PEI) polimeri seçilmiştir. ZIF-8, katkı maddesi olarak ZIF-8 katkılı PEI membranı sentezlenmiş ve karakterize edilmiştir. Membranların kimyasal bağ yapısı, termal dayanımı morfolojisi sıraısyla Fourier dönüşümü kızılötesi spektroskopisi ...