Polyvinyl Alcohol/Agarose Blended Membranes for Pervaporative Separation of Ethanol/Water Mixture

Document Type : Research Article


Department of Chemical Engineering, Razi University, Kermanshah, I.R. IRAN


Alcohol dehydration is accomplished by various processes, especially pervaporation with increased attention and applications. Many hydrophilic polymeric membranes have been prepared and used for alcohol dehydration. Polyvinyl alcohol (PVA) is one of the most important polymeric membranes in this regard. In this study, modification of the prepared polyvinyl alcohol membranes by blending method them with Agarose (Aga) in order to achieve higher separation performance is studied. PVA/Aga blended membranes are prepared and used for separation of ethanol/water solution using pervaporation process. The structure of the membranes was investigated using SEM and contact angle tests. In the carried out experiments, pervaporation operating temperature and pressure are kept fixed at 30 °C and - 830 mbar abs, respectively, and effects of the feed composition and the blending ratio on the membrane separation parameters are studied. The results showed that membranes have enhanced separation performance for water/ethanol mixtures. The highest selectivity as infinity and flux of 0.243 kg/m2h was obtained for the 50 wt. % Aga membrane and the feed mixture of 30 wt. %. The 60 wt. % Aga membrane selectivity and flux for dehydration of the feed mixture containing 70 wt. % ethanol are obtained as infinity and 0.838kg/m2h, respectively.


Main Subjects

[1] Néel J., Chapter 5 Pervaporation. Membrane Science and Technology,. 2: 143-211. (1995)
[2] تکبیری, م., ت. محمدی, ا. پاک, جداسازی ترکیب های گوگردی از بنزین توسط فرایند تراوش تبخیری. نشریه شیمی و مهندسی شیمی ایران, (1)31، 71 - 80 (1391)
[4] Torkaman R., Kazemian H., Soltanieh M., Removal of BTX Compounds from Wastewaters Using Template Free MFI Zeolitic Membrane. Iranian Journal of Chemistry and Chemical Engineering (IJCCE), 29(4): 91-98 (2010)
[5] Smitha B., et al., Separation of Organic–Organic Mixtures by Pervaporation - A Review. Journal of Membrane Science, 241(1): 1-21 (2004)
[6] Shao P. Huang R.Y.M., Polymeric Membrane Pervaporation. Journal of Membrane Science, 287(2): 162-179 (2007)
[7] Baker M.I., et al., A Review of Polyvinyl Alcohol and Its Uses in Cartilage and Orthopedic Applications. Journal of Biomedical Materials Research Part B: Applied Biomaterials, 100B(5): 1451-1457 (2012)
[9] Bhat N.V., Wavhal D.S., Preparation of Cellulose Triacetate Pervaporation Membrane by Ammonia Plasma Treatment. Journal of Applied Polymer Science, 76(2): 258-265 (2000)
[10] Rao K.S.V.K., et al., Blend Membranes of Chitosan and Poly(Vinyl Alcohol) in Pervaporation Dehydration of Isopropanol and Tetrahydrofuran. Journal of Applied Polymer Science, 103(3): 1918-1926 (2006)
[12] Zhang W., et al., Maleic Anhydride Surface-Modification of Crosslinked Chitosan Membrane and Its Pervaporation Performance. Journal of Membrane Science, 295(1): 130-138(2007)
[13] Upadhyay D.J., Bhat N.V., Pervaporation Studies of Gaseous Plasma Treated PVA Membrane. Journal of Membrane Science, 239(2): 255-263 (2004)
[14] Marcano D.C., et al., Improved Synthesis of Graphene Oxide. ACS Nano, 4(8): 4806-4814 (2010)
[17] Kanse N.G., Dawande S.D., Separation of Ethanol/Water (Azeotropic mixture) by Pervaporation using PVA Membrane. Materials Today: Proceedings, 4(9): 10520-10523 (2017)