High flux, chlorine resistant coating for sulfate removal membranes
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United States of America Patent
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Oct 24, 2023
Grant Date -
Jul 30, 2020
app pub date -
Apr 15, 2020
filing date -
Jun 22, 2017
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Abstract
A filtration membrane coating comprising a hydrophilic polymer, a surfactant, and one or more charged compounds, each containing one or more sulfonate functionalities and one or more linkable functionalities selected from the group consisting of amine, monochlorotriazine, and dichlorotriazine. The hydrophilic polymer and surfactant form a thin primer layer which is also superhydrophilic. The primer layer improves flux, and enables improved adhesion of the one or more charged compounds, which form a charged dye layer on top of the primer layer when enhances rejection of charged divalent ions. The coating can be applied while the membrane is packaged in its final form, such as in a spiral wound or other configuration.
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