Liquid purification or separation – Processes – Ion exchange or selective sorption
Patent
1993-01-12
1993-09-21
Silverman, Stanley S.
Liquid purification or separation
Processes
Ion exchange or selective sorption
210791, 210282, 210484, 210499, 210503, 264 36, B01D 4100
Patent
active
052465896
ABSTRACT:
A repair method for filter elements such as those used to filter polyester during the later stages of polyester manufacture in which the filter media is a particulate solid media arranged in a desired shape and maintained in that shape by a surrounding porous container that has filtration openings of a desired size. The method fills undesirably large openings in the surrounding porous container that result from damage to the container and through which enlarged openings the particulate solid media would otherwise escape with a polymeric resin. The polymeric resin is a resin with a glass transition temperature when cured that is at least greater than the melting point of polyester, and that has an absence of any chemical functional groups at temperatures at least as great as the melting point of polyester that would substantially react with polyester, the glycol precursors of polyester, the acid precursors of polyester, or the solvents useful in cleaning polyester from such filter elements.
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Edwards John V.
Nichols Carl S.
Nessler Cynthia L.
Silverman Stanley S.
Wellman, Inc.
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