Desalting of small organic molecules using nanofiltration

P. Dyer*, T. Fenton, J. Grey, Callaghan Innovation, New Zealand

The problem to be solved is the removal of salts from aqueous solutions containing some desired small organic molecules. After a unit operations like ion exchange, there will be salts contained in the eluent as well as the organic molecule. The objective of this work was to assess nanofiltration (NF) membranes as a potential method of washing out commonly used salt pairs before further drying or concentration processes.

Models solutions were made up with different salt pairs with using lactose and glucose as test carbohydrates. The test membrane plant using a range of 2540 sized spiral NF membranes at low transmembrane pressures (2-8 bar). The degree of separation in the rejection coefficient was measured between the salt and carbohydrate molecules, as well as the processing flux rates as a function of pressure. It was shown that...

Session: M4 - Short Oral + Poster Presentations
Day: 14 March 2018
Time: 14:45 - 16:45 h

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