Hybrid tfc ro membranes with nitrogen additives

a technology of nitrogen additives and tfc membranes, which is applied in the field of hybrid tfc ro membranes with nitrogen additives, can solve the problems of reduced flux, limited success, and inability to operate well of tfc membranes suitable for brackish water use, i.e., at low pressure and salt load, and achieves the effect of increasing flux, anti-fouling characteristics, and reducing the number o

Active Publication Date: 2011-01-13
NANOH2O
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect that this patented technology improves upon existing methods by combining different types of materials into special composites called nanofilms or microtubelets (tiny tubular structures made from small metal particles). These composite films can be tailored specifically towards specific purposes like increasing their efficiency or reducing fouled areas on certain surfaces. This results in enhanced performance over time without requiring frequent maintenance.

Problems solved by technology

The technical problem addressed in this patents relates to improving the efficiency of separations processes involving fluorochemical substances called tetraethylene mononaphtha (2H), dichromatics containing chromanolines, quaternary carboxylic acids, cyclohexane derivatives, aliphatically unsaturated fatty acid alkoxides, polysilanes, silicone resins, polyimidazole compositions, etcetera. However, current methods involve adding stabilizers like caffiators to increase the solubility of target molecules during processing, leading to decreases in filtrant capacity due to enzyme decomposition. Additionally, previous attempts resulted in poor reproduction behavior over time caused by accumulated foulings. Therefore, new ways to achieve stable production of antifreeze and highly effective separation membranzodes while reducing process variations and controlling salt release remain necessary.

Method used

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  • Hybrid tfc ro membranes with nitrogen additives
  • Hybrid tfc ro membranes with nitrogen additives
  • Hybrid tfc ro membranes with nitrogen additives

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Effect test

example 185

[0358 illustrates one of the benefits of a hybrid TFC membrane approach in which nanoparticles, such as LTA are combined with molecular additives, such as Ga(acac)3, to form an improved hybrid TFC membrane with qualities superior than are provided by either additive separately. In particular, the hybrid LTA Ga membrane provided 31.9 GFD flux, an improvement of about 41% more than the control with only slight loss in salt rejection. The further increase in flux is on the order of an addition 14% when compared to the 36% flux increase of the Ga(acac)3 additive. Perhaps even more importantly, the flux rate after the 47 hour test was 27.3 GFD, i.e. the flux loss was only 17% after the 47 hour test. As a result, the hybrid TFC membrane has substantially the flux improvement of its soluble additive, in this case the Ga(acac)3, and the fouling resistance of the LTA nanoparticles.

Section E: Advantages

[0359]Hybrid membranes, that is, membranes with nanoparticles, and additives such as soluble i

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Abstract

RO membranes using chlorinated water as a feed stream maybe protected from damage by the chlorine with a protective layer including reactive nitrogen which forms chloromines on the surface of the membrane that reduce chlorine penetration. This protective layer also provides substantial anti-fouling capabilities, whether used with a chlorinated or unchlorinated feed stream because the chloramines are anti-bacterial. Although chlorine is lost in use, the anti-fouling layer or coating can be recharged with additional chlorine without damaging the discrimination layer. The anti-fouling layer or coating may be advantageously used with Thin film composite, TFC, membranes for use in forward and reverse osmosis may include nanoparticles, monohydrolyzed and/or di-hydrolyzed TMC, and/or alkaline earth alkaline metal complexes or other additives.

Description

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Claims

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Application Information

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Owner NANOH2O
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