Journal
DESALINATION
Volume 192, Issue 1-3, Pages 303-314Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.desal.2005.05.031
Keywords
nanofiltration; membrane screening; alkali resistant membranes; hemicellulose; sodium hydroxide; molar mass dependent retention; size exclusion chromatography
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The performance of five polymeric nanofiltration and tight ultrafiltration membranes was investigated during separation of hemicellulose from process liquors containing 200 g/l sodium hydroxide. The effect of pressure and temperature on flux and retention was determined to enable optimization of operating conditions. Retention behavior was further elucidated by calculating retention as a function of molar mass obtained from size exclusion chromatography (SEC) between 100 and 50,000 g/mol. The experimental data show that hemicellulose is almost quantitatively retained at molar masses above 1,000 g/mol. Two of the membranes exhibiting excellent overall hemicellulose retention (around 90%) are most suitable for efficient removal of hemicellulose from the process. The results emphasize the need for accurate retention data from industrial effluents and process conditions.
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