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Membrane Preparation For Organic Compounds Dehydration

Basafa, Elahe | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45003 (06)
  4. University: Sharif University of Technology
  5. Department: Chemical and Petroleum Engineering
  6. Advisor(s): Musavi, Abbas; Ramazani, Ahmad
  7. Abstract:
  8. Isopropanol purifying denotes dehydration of it to utilize in industries become important these days. Conventional process like distillation could not produce this product in high purity. Using membrane-based process, pervaporation, to dehydrate Isopropanol and other organic compound has been noticed in the last years. Among all type of membranes to dehydrate alcohols, poly (vinyl alcohol) is more effective due to its high hydrophilic characteristic. But it swallows in aqueous solutions and decrease its selectivity. To enhance structural and separation properties Chitosan, TiO2 and glurataldehyde added to polymeric membranes. Nine membranes have been made in this study that can be grouped in three categories in polymer composition PVA/CS: 90/10, 80/20, 70/30wt%. First category contains no nanoparticle, second group contain 0.5wt% TiO2 (based on polymer weight) and third group contains 1wt% TiO2. All membranes were crosslinked by Glutaraldehyde. The effect of feed composition, ISP/WATER: 90/10, 80/20, 70/30wt%, and feed temperature, 30, 40, 50⁰C, on PV separation performance has been evaluated. With increasing temperature and water contain of feed, Separation factor and flux, dropped and rose respectively. With increasing Chitosan and TiO2, separation factor and flux, rose and dropped respectively. Nano composite membrane PVA/CS: 70/30 – 1wt% TiO2 showed the highest separation factor and lowest flux. Membrane without TiO2, PVA/CS: 90/10 showed the lowest separation factor and highest flux. Structural analysis FTIR, DSC, XRD and SEM adjusted all above results
  9. Keywords:
  10. Pervaporation ; Membranes ; Poly Vinyl Alcohol ; Chitosan ; Titanium NanoParticles

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