Microporous alumino-phosphate (AlPO4-5) molecular sieve-loaded novel sodium alginate composite membranes for pervaporation dehydration of aqueous–organic mixtures near their azeotropic compositions☆

Pervaporation separation of isopropanol–water mixtures using mixed matrix blend membranes of poly(vinyl alcohol)/poly(vinyl pyrrolidone) loaded with phosphomolybdic acid

“…Swelling experiments were performed gravimetrically at 30 C for IPA/water mixture with variable water compositions of 10, 20, 30, and 40 wt %. Initial masses of the circularly cut (dia ¼ 3 cm) membranes were taken by placing them on a single-pan digital microbalance (model AE 240, Mettler, Switzerland) sensitive to 60.01 mg.…”

“…Samples were placed inside the specially designed airtight test bottles containing 30 cm 3 of the test solvent and were placed in hot-air oven maintained at the constant desired temperature. Dry membranes were equilibrated by soaking in different compositions of the feed mixture in a sealed vessel at 30 C for 48 h. Swollen membranes were weighed immediately after carefully blotting them on a digital single pan microbalance. Sorbed liquids were recovered in a liquid nitrogen trap by desorbing the equilibrated sample in the purge and trap apparatus, which were analyzed by gas chromatography (Model: Ultima-2100, Netel India, Mumbai, India).…”

Nanocomposite Membranes of Poly(Vinyl Alcohol) Loaded with Polyaniline-Coated TiO2 and TiO2 Nanoparticles for the Pervaporation Dehydration of Aqueous Mixtures of 1,4-Dioxane and Tetrahydrofuran

“…However, optimizing these characteristics is a formidable task. Recently, research trends have shifted from the use of nascent membranes [10,11] to developing filler-reinforced mixed matrix membranes, in which nano-sized inorganic fillers have been used [12][13][14][15][16][17][18][19][20][21]. Membrane performance in such cases depends on filler loading, matrix/filler adhesion and level of dispersion of filler particles in the polymer matrix in addition to their physico-chemical characteristics [22,23].…”

Blend Membranes of Sodium Alginate/Poly(Styrene Sulfonic Acid) for Isopropanol Dehydration

“…Pervaporation (PV) is an attractive membrane-based technique that has been used to separate azeotropic, closely-boiling, isomeric or temperature-sensitive liquid mixtures [1][2][3]. The technique is environmentally benign, since no entrainer such as benzene is added to break the azeotrope, unlike in distillation [4].…”

“…Among the many polymers used as membranes, polymer blends are attractive, since these could offer increased flux and selectivity over the homo-polymeric membranes [6][7][8]. Even though NaAlg has been widely used as a PV membrane, due to its drawbacks like water-soluble property and mechanical weakness [9], blends, grafts and filled composite membranes of NaAlg have been attempted [2,[10][11][12][13]. In this paper, we report the development of blend membranes of NaAlg with poly(styrene sulfonic acid), PSSA in PV dehydration of isopropanol, since it is a widely-used solvent in pharmaceutical industry; it forms an azeotrope at 12.5 wt% of water.…”