Modified polysulfone membranes. III. Pervaporation separation of benzene-cyclohexane mixtures through carboxylated polysulfone membranes*

Abstract

Membranes prepared from carboxylated polysulfone permeated benzene preferentially from benzene-cyclohexane mixtures by pervaporation. Hydrophilic polysulfones containing carboxyl groups with degrees of substitution (DS) ranging from 0.46 to 1.90 groups per repeating unit were selected for this study. The membrane having a carboxyl group DS of 0.88 showed the best trade-off between flux and permselectivity. The permselectivity towards benzene was 234 at the weight fraction of benzene in feed of 0.1. From pervaporation and sorption experiments, it was evident that permselectivity toward benzene was due to solubility selectivity.

Optical Resolution Membranes from Polysulfones Bearing Alanine Derivatives as Chiral Selectors

“…Polymeric membranes having molecular recognition sites introduced by applying an alternative molecular imprinting22, 26, 35 or polymer reaction 30,32 and those with chiral environments33, 34 were used as materials for chiral separation membranes. Modified polysulfone membranes for chiral separations,22, 30, 32 pervaporation separation,36–38 and selective separation of CO 2 39 have been investigated by the authors. In the present study, polysulfone containing benzylamine group (PSf‐NH 2 ),40 which had previously been used as a precursor for molecular recognition materials,41 was adopted as a reactive base material for introducing D ‐ and L ‐alanine derivatives ( N ‐ α ‐acetyl‐ D ‐alanine and N ‐ α ‐acetyl‐ L ‐alanine), and the chiral separation ability of those membranes was investigated.…”

Heterogeneous surface modification of hollow fiber membranes for use in micro-reactor systems

“…Thus resulting in high volume throughput, high ligand utilization and low cost. Furthermore, such membranes are usually preferred for their good chemical resistance, low fouling characteristics and broad pH range (pH 2-12) [4][5][6][7].…”

Specialty polymeric membranes. XIV. Pervaporation of benzene/cyclohexane mixtures through modified polyamide membranes

“…The separation of aromatics and aliphatics into an aromatic‐rich permeate, which is employed for high‐octane‐number gasoline, and into an aromatic‐lean retentate, which is used for diesel, is one interesting membrane separation process in petroleum refining in connection with environmental issues 3. Many articles have reported on the pervaporation separation of benzene/cyclohexane mixtures, both components being top 50 chemicals,4 with synthetic polymeric membranes 5–53. As described previously,43 membrane materials for petroleum refining should be chosen from commercially available common polymers or common polymers chemically modified without complicated modification reactions because large volumes of mixtures should be treated by the prepared membrane.…”

“…As described previously,43 membrane materials for petroleum refining should be chosen from commercially available common polymers or common polymers chemically modified without complicated modification reactions because large volumes of mixtures should be treated by the prepared membrane. To this end, nylon 6,25, 27, 44, 48, 51 polyamide–polyether block copolymer,38 poly(vinyl chloride),43 poly(vinyl alcohol),45 polysulfone,47 and poly(vinylidene chloride‐ co ‐vinyl chloride)52 have been adopted as membrane materials, and the pervaporation performances of membranes from modified and unmodified polymers have been investigated.…”