Dehydration of light oil by pervaporation using poly(vinyl alcohol)–poly(acrylic acid‐co‐maleic acid) membranes

Abstract

ABSTRACT:A new blended membrane was prepared and tested by pervaporation of light oil, a mixture of five alcohols plus water. The blended membrane was synthesized by blending poly(vinyl alcohol) and poly(acrylic acidco-maleic acid) sodium salt in the presence of sulfuric acid to dope the reaction. We tested several membranes in order to choose the adequate composition to have the best permselectivity. The PVA(60)-PAA-co-maleic acid(40) membrane was selected as it was found to be highly selective. Sorption experiments were performed using binary and ternary water-alcohol solutions. The influence of temperature and feed composition on the selectivity and flux in pervaporation was investigated for two different binary mixtures (water/ethanol, water/isobutanol) and one ternary system (water/ethanol/isobutanol). This membrane presents good permselective properties, high water flux, and good selectivity and can even be used for high-water activities The performances of this new membrane were compared to those obtained with the PVA(90)-PAA(10) membrane synthesized recently: The fluxes observed for the water-ethanol separation were of the same order of magnitude but the selectivity was found to be much higher.

Fluorescent Ag nanoclusters prepared in aqueous poly(acrylic acid-co-maleic acid) solutions: a spectroscopic study of their excited state dynamics, size and local environment

“…Also, varying the ratio of acrylic acid and maleic acid residues will allow a means of manipulating the hydrophilicity of such copolymers in future studies, without severely compromising their efficiency as nanocluster stabilizers. Moreover, poly(acrylic acid-co-maleic acid) can be blended with other utility polymers like PVA, 25 which opens the prospect of fabricating membranes ingrained with fluorescent metal nanoclusters. Our objective was to perform spectroscopic studies on the optical absorption and fluorescence properties of the synthesized nanoclusters to identify their electronic excitation/ relaxation pathways and the associated dynamics.…”

Fabrication and Characterization of Pulp/Chitosan Composite Membranes Crosslinked with 3-Methylglutaric Anhydride for Pervaporation of Ethanol/Water Mixture

“…In blended polyelectrolyte membranes for PV dehydration of alcohols, blended chitosan and polyacrylic acid membranes have been used [12,13], as well as blended chitosan and sodium al-ginate membranes [14]. It was furthermore studied that synthetic polymer membranes were also widely applied in PV separation [15][16][17][18][19]. We noted that, by the application of such blending techniques, the properties of the resultant polymer membranes could demonstrated superior changes in the intrinsic chemical, physical, mechanical, and morphological properties, as compared to non blended membranes.…”

Characterization and performance evaluations of sodium zeolite‐Y filled chitosan polymeric membrane: Effect of sodium zeolite‐Y concentration

“…Among the applications are the dehydration of ethanol using different types of water selective membranes such as (HY) zeolite filled (CS), 1 an asymmetric polysulfone membrane, 2 a CS/ poly(acrylic acid) membrane, 3 a composite membrane of poly(acrylic acid) and plasma-treated polycarbonate, 4 metal ion exchanged poly(vinyl alcohol) (PVA)/ sulfosuccinic acid, 5 and sulfonated zirconia-PVA. 6 It is also applied in the dehydration of the following: alcohol using a surface resintering expanded poly(tetrafluoroethylene), 7 butanol using an asymmetric sulfonated polystyrene sulfonated poly(ether sulfone), 8 phenol using a polyamide membrane, 9 isopropanol using a sodium alginate (SA)/polyacrylamide blend membrane, 10 isopropanol using an polyacrylonitrile/ alginate membrane, 11 isopropanol using a sodium zeolite-Y (NaY zeolite) incorporated SA membrane, 12 light oil using a PVA/poly(acrylic acid-co-maleic acid) membrane, 13 toluene using a composite membrane, 14 hydrazine using an ethylcellulose membrane, 15 and dehydration of tetrahydrofuran using a polyacrylamide-grafted SA copolymeric membrane. 16 Pervaporation is also used in the removal of small quantities of volatile organic solutes or organic solvents from water using hydrophobic membranes.…”