The pervaporation membrane process is an energy-efficient separation process that enables the separation of azeotropic mixtures with low cost and high efficiency compared to traditional separation processes such as distillation and evaporation. In addition, pervaporation can be used for the dehydration of organic/water mixtures, the recovery of organic components in water, and the separation of organic-organic mixtures. Poly(dimethylsiloxane) (PDMS), a hydrophobic and elastic polymer, has a low glass transition temperature and is widely used for solvent recovery from organic-water mixtures. Poly(vinylalcohol) (PVA) is a semicrystalline and water-soluble polymer, and it can be used as a membrane material in the dehydration and purification of organic-water mixtures.
Isopropanol has a variety of application areas such as disinfectants, pharmaceuticals, and solvent applications. The separation of isopropanol mixtures is commonly a difficult process due to the tendency of isopropanol to form an azeotropic mixture with other molecules. The isopropanol-water system is nonideal with the presence of a minimum boiling azeotrope found at all pressures.
In this study, PDMS and PVA membranes were prepared for the recovery of isopropanol from the aqueous mixture, and the dehydration of the isopropanol-water mixture, respectively. Since the transport across the non-porous membrane used in pervaporation is explained by the dissolution-diffusion mechanism consisting of sorption-diffusion-desorption steps, sorption data are important in evaluating membrane performance. Therefore, the sorption of pure isopropanol and pure water, and isopropanol-water mixtures was investigated at 30, 40 and 50°C using the prepared PDMS and PVA membranes, and the interactions between membrane and solvent were evaluated. ORCID NO: 0009-0001-9541-231X, 0000-0002-2702-5991, 0000-0002-1375-6953
Anahtar Kelimeler: Poly(vinylalcohol), Poly(dimethylsiloxane), Membrane, Isopropanol-water mixture, Pervaporation
|
