Polyamide membranes are subject to deterioration by the chlorine added to the feed water. The desired, more robust membrane, would tolerate higher concentrations of chlorine without chemical damage. The current polyamide thin film membrane is made by an interfacial reaction between the reactant pair trimesoyl chloride (TMC) and m-phenylenediamine (MPD). Work has been done in modifying this chemistry by replacing the acid chloride TMC with a new acid chloride, mono-fluoro trimesoylchloride (mFTMC). Spiral wound elements have been made with this new chemistry and are being tested for chlorine resistance.
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