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Rejection properties of alkyl phthalates with nanofiltration membranes
We have examined the rejection properties of nanofiltration (NF) membranes for alkyl phthalates and other solutes such as mono-substituted benzenes, alcohols, and saccharides. In this study, four kinds of NF membranes were used, each with nominal desalting degree (NaCl rejection) of 91, 60, 51, and...
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Published in: | Journal of membrane science 2001-02, Vol.182 (1), p.205-214 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | We have examined the rejection properties of nanofiltration (NF) membranes for alkyl phthalates and other solutes such as mono-substituted benzenes, alcohols, and saccharides. In this study, four kinds of NF membranes were used, each with nominal desalting degree (NaCl rejection) of 91, 60, 51, and 15%, respectively. The membrane separation experiments were carried out with a bench scale batch type cell at room temperature.
The rejection of alcohols and saccharides was mainly controlled by steric hindrance. We have found that molecular width is a useful descriptor to represent this effect. On the other hand, the rejection of aromatic compounds, alkyl phthalates and mono-substituted benzenes, was strongly affected by their hydrophobic properties (log
P).
Higher hydrophobic alkyl phthalates (
log
P>4.7
) were rejected at more than 99% even by the lowest desalting membrane. The highest desalting membrane rejected almost all alkyl phthalates at more than 96%. However,
p-dimethyl phthalate and
p-diethyl phthalate showed significantly lower rejection, from which it can be concluded that their molecular widths are close to those of mono-substituted benzenes, i.e. smaller than those of the other alkyl phthalates. |
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ISSN: | 0376-7388 1873-3123 |
DOI: | 10.1016/S0376-7388(00)00567-6 |