Organic solvent nanofiltration porous membranes

These various methods have been discussed in chapter III. Since reverse osmosis membranes may be considered as intermediate between porous ultrafiltration membranes and very dense nonporous pervaporation/gas separation membranes, it is not necessary that their structure to be as dense as for pervaporation/gas separatipn. Most composite reverse osmosis and nanofiltration membranes are prepared by interfacial polymerisation (see chapter in. 6) in which two very reactive bifunctional monomers (e.g. a di-acid chloride and a di-amine) or triiunctional monomers (e.g. trimesoyicbloride) are allowed to react with each other at a water/organic solvent interface and a typical rietwork structure is obtained. Another example of monomers used for interfacial polymerisation are given in table VI.6 (see also table m.1). 

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