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US 4,747,955 AGranted
Purification of liquids with treated polyester fibers
AssigneeThe Graver Company
InventorRobert Kunin
Life of this patent
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Abstract
A method for removing impurities from a liquid utilizing a filter bed having polyester fibers which have been treated with a hot caustic solution to increase the hydrophilicity of the polyester fibers. The caustic solution preferably contains a surfactant to increase the initial wetting of the polyester fibers.
Claims30
A method for removing impurities from a liquid comprising:
- passing said liquid through a filter bed comprising a mixture of oppositely charged polyester fibers, wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
A method for removing impurities from a liquid comprising:
- passing said liquid through a filter bed comprising a mixture of ion exchange resin particles and treated polyester fibers, said ion exchange resin particles and said treated polyester fibers having opposite surface charges in aqueous suspension, and wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
A method for removing impurities from a liquid comprising:
- passing said liquid through a filter bed comprising a mixture of an active particulate material and treated polyester fibers, said active particulate material and said treated polyester fibers having opposite surface charges in aqueous suspension, and wherein said polyester fibers have been treated with a caustic solution to increase the hydrophilicity of said polyester fibers.
Dependencies are inferred from the claim text.