Performance of hydroxy sodalite membranes as absolute water selective materials under acidic and basic conditions
✍ Scribed by Sheida Khajavi; Jacobus C. Jansen; Freek Kapteijn
- Book ID
- 104056030
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 910 KB
- Volume
- 356
- Category
- Article
- ISSN
- 0376-7388
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✦ Synopsis
Gas tight ␣-alumina supported hydroxy sodalite membranes were employed in pervaporation, testing the acid and base stability of the membranes through prolonged dehydration of acetic acid/water mixtures and sodium hydroxide solutions with different concentrations at 473 K and 2.2 MPa cross-membrane pressure. Under continuous operation for approximately 320 h, hydroxy sodalite membranes showed good acid and base stability within a feed pH range of 2.9-13.7. Under these conditions the membrane showed absolute selectivity towards water, and the flux through the membrane remained fairly stable. The membranes were also employed in dehydration of acetone/water mixtures at different temperatures and feed compositions. The membrane exhibited a water/acetone separation factor larger than 10 6 .