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Desalination of aqueous mixtures containing nanometer-sized particles using anti-fouling reverse osmosis membranes

A water-based mixture and nano-particle technology, applied in reverse osmosis, water pollutants, semi-permeable membrane separation, etc., can solve problems such as membrane fouling

Inactive Publication Date: 2019-04-02
DOW GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And while many currently available reverse osmosis membranes remove satisfactory levels of feed species, such as various salts, these membranes tend to foul

Method used

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  • Desalination of aqueous mixtures containing nanometer-sized particles using anti-fouling reverse osmosis membranes
  • Desalination of aqueous mixtures containing nanometer-sized particles using anti-fouling reverse osmosis membranes
  • Desalination of aqueous mixtures containing nanometer-sized particles using anti-fouling reverse osmosis membranes

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Experimental program
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[0071] All sample membranes were prepared using a pilot-scale membrane production line. A polysulfone support was cast using a 16.5 wt% solution of polysulfone in DMF and then soaked in a 3.5 wt% m-phenylenediamine (mPD) aqueous solution. The resulting carrier is pulled out of the reaction table at a constant speed while applying a thin layer of uniform non-polar solution. Non-polar solutions include trimesoyl chloride (TMC) and monohydrolyzed trimesoyl chloride (mhTMC) in an isoparaffinic solvent (ISOPAR L). The total acid chloride content of the non-polar solution used to prepare each sample was kept constant at 0.20% w / v. The concentration of mhTMC varied between samples ranging from 0 to 0.06% w / v, while the remaining acid chloride content was only contributed by TMC. The non-polar solution also contained tributyl phosphate in a stoichiometric molar ratio of approximately 1:1.1 to TMC. Excess non-polar solution was removed and the resulting composite membrane was passed...

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Abstract

A method for treating an aqueous NaCl-containing mixture comprising at least 2 ppm anionic nanoparticles, comprising the steps of passing the mixture through a helically wound element to produce a permeate stream and a concentrate stream, wherein the concentrate stream The nanoparticle concentration is relatively higher than the permeate stream, wherein the helically wound element comprises a composite polyamide membrane comprising a porous support and a thin film polyamide layer, and wherein the membrane is characterized by : i) NaCl blocking and nanoparticle blocking of at least 99% when tested with an aqueous solution containing 2000 ppm NaCl and 2 ppm anionic nanoparticles at 25°C, pH 8, and 1 mPa (150 psi); and ii) as determined by Rutherford Back The content of dissociated carboxylate groups at pH 9.5 is at least 0.3 moles per kg of polyamide as measured by scattering (RBS).

Description

technical field [0001] The present invention relates to the treatment of aqueous mixtures containing nano-sized particles. Background technique [0002] Many industrial processes require extremely pure water, such as so-called "ultrapure water" (UPW) applications. The electronics industry is one such example. Even trace amounts of impurities can interfere with the manufacturing process, (see also Ganesh et al., Potential Impacts of Nanoparticles on Water Reclamation). And while many currently available reverse osmosis membranes remove satisfactory levels of feed species, such as various salts, these membranes tend to foul. For example, the feed water used in many industrial processes has a relatively low pH, such as below 5 or even 3. At such low pH values, commercially available thin-film polyamide composite membranes have a near-neutral charge. Consequently, nanometer-sized particles present in the feed tend to coalesce on the membrane surface. For example, nanometer-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D61/02B01D69/02B01D69/12B01D71/56
CPCB01D61/025B01D63/10B01D67/0088B01D71/56C02F1/441C02F2101/10C02F2103/346Y02A20/131B01D69/02B01D69/1251B01D69/107B01D2321/167B01D2323/21815B01D61/04B01D67/0006C02F2101/12C02F2103/04
Inventor M·保罗A·罗伊I·A·汤姆林森
Owner DOW GLOBAL TECH LLC