MUMBAI, India, Aug. 17 -- Intellectual Property India has published a patent application (202511003860 A) filed by Council Of Scientific And Industrial Research, An Indian Registered Body Incorporated Under The Regn. Of Soc. Act Act Xxi Of on January 16, 2025, for Asymmetric Semipermeable Polymer Nanofilm Composite Membrane And A Process For The Preparation Thereof.
Inventors include Santanu Karan; Manas Ranjan Puhan; and Dinesh Bahadursing Vasave.
The application for the patent was published on August 14, 2026, under issue no. 33/2026.
Abstract: The present invention providesasymmetric semipermeable polymer nanofilms; theircomposite membranes; and method of preparation thereof. The composite membranes are produced via interfacial polymerization of poly-substituted amine- or hydroxyl- or amine and hydroxyl- containing monomer (or polymer) with the addition of base and interface-active molecule in the aqueous phase and poly-substituted acyl halide- or poly-substituted isocyanate- or poly-substituted aldehyde- or poly-substituted chlorinated derivative of triazine-containing molecule in the organic phase. The composite membrane hasa molecular weight cut-off of 200 g mol- 1with high water permeance of up to 30.6Lm-2h-1bar-1; tunable rejection of Na2SO4(10.9 – 99.99%); MgCl2 (53.8 – 99.4%); NaCl (11.0 – 99.8%) and high ion selectivity(130 – 2764).Extremely high rejection of Na2SO4of 99.95% was retained for a hypersaline feed containing at least 150 gL-1of Na2SO4 and a for a feed with a total salt concentrationof 300 gL-1and operated at 70 bar.
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