TREATMENT OF AQUEOUS MIXTURES CONTAINING ANIONIC SURFACTANTS USING FOULING RESISTANT REVERSE OSMOSIS MEMBRANE

A method for treating an aqueous mixture containing an anionic surfactant including the step of passing the mixture through a spiral wound element to produce a permeate stream and concentrate stream wherein the concentrate stream has a relatively higher concentration of the anionic surfactant than t...

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Bibliographic Details
Main Authors TOMLINSON, IAN A, PAUL, MOU, PEERY, MARTIN H, ROY, ABHISHEK
Format Patent
LanguageEnglish
French
Published 16.07.2015
Subjects
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
TRANSPORTING
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Summary:A method for treating an aqueous mixture containing an anionic surfactant including the step of passing the mixture through a spiral wound element to produce a permeate stream and concentrate stream wherein the concentrate stream has a relatively higher concentration of the anionic surfactant than the permeate stream, wherein the spiral wound element includes a composite polyamide membrane comprising a porous support and a thin film polyamide layer, and wherein the membrane is characterized by having: i) a NaCl rejection and an anionic rejection of at least 99% when tested with an aqueous solution containing 2000 ppm NaCl and 2 ppm an anionic surfactant at 25°C, pH 8 and ImPa (150 psi); and ii) a dissociated carboxylate content of at least 0.3 moles/kg of polyamide at pH 9.5 as measured by Rutherford Backscattering (RBS).
Bibliography:Application Number: CA20142935680