Separation of ethanol/ethyl acetate mixture by pervaporation at 100–130 °C through NaY zeolite membrane for industrial purpose
✍ Scribed by Kiminori Sato; Kazunori Sugimoto; Takashi Nakane
- Publisher
- Elsevier Science
- Year
- 2008
- Tongue
- English
- Weight
- 349 KB
- Volume
- 115
- Category
- Article
- ISSN
- 1387-1811
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✦ Synopsis
Ethanol separation from mixtures of ethanol (EtOH) and ethyl acetate (EtAc) was performed by pervaporation (PV) at feed conditions of 100-130 °C and 1, 5, 10 and 30 wt.% ethanol content through the NaY zeolite membranes synthesized for industrial purpose. Experimental results showed that higher permeation fluxes up to 2.9 kg m À2 h À1 at 130 °C in a feed mixture of EtOH (30 wt.%)/EtAc (70 wt.%) was observed. The ethanol permeance (mol m À2 s À1 Pa À1 ) ranged from 1.6 Â 10 À8 to 5.4 Â 10 À8 in all feed conditions. Higher temperatures and higher ethanol contents in feed enhanced permeation ethanol flux or ethanol permeance. Higher and moderate separation factors (a) of 27-82 were observed through the results, indicating this membrane performance could be utilized in practical separating process to break up the azeotrope in the ethanol-ethyl acetate mixture. The separating mechanism could be attributed to the affinity difference in two molecules of ethanol and ethyl acetate. This separation could be a typical case for preferential adsorption mechanism that could separate components with smaller molecular sizes than zeolitic pore size.