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|Title:||Dehydration of alcohols by pervaporation using hydrophilic polyether urethane membranes|
|Abstract:||This study presents pervaporation separation of methanol-water (MW), ethanol-water (EW) and isopropanol-water (IW) mixtures through a series of polyethylene glycol (PEG) based polyether urethane membranes. Five polyether urethane (PUPEG) membranes were developed by using PEGs of increasing molecular weight (PEG₂₀₀, PEG₄₀₀, PEG₆₀₀, PEG₁₀₀₀ and PEG₄₀₀₀). PUPEG membranes showed selectivity towards water, which increased with increasing molecular weight as well as increasing polymer chain length of the membrane. PUPEG membrane prepared using PEG₄₀₀₀ showed highest separation performance in dehydrating water from three alcohol-water mixtures. A pervaporation flux of 0.48 kg/m².h was achieved with 94.5% water in permeates from 20% water present in isopropanol-water mixture using PUPEG₄₀₀₀ membrane. All PUPEG membranes showed water separation performances; flux and separation factor for water varied in the order: MW <EW<IW mixtures.|
|Appears in Collections:||JSIR Vol.67(03) [March 2008]|
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|JSIR 67(3) (2008) 219-227.pdf||226.33 kB||Adobe PDF||View/Open|
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