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US 4,379,763 AGranted
Waste water treatment by chelation-gelation
AssigneeMinnesota Mining and Manufacturing Company
InventorsLawrence M. Clemens, Alton J. Gasper
Life of this patent
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Abstract
Contaminant components in waste water are complexed with a chelating agent and the complexed component is gelled with a polyurethane prepolymer to provide a gelled mass.
Claims12
A treatment method comprising:
- (1) mixing waste water containing a contaminant chemical component with a chelating agent capable of forming a complex with said component, said chelating agent being selected from the group consisting of
- (A) a polymer containing the .beta.-hydroxyalkylene amine moiety characterized by having an equivalent weight of hydroxyalkylene amine of 87 to 10,000;
- and
- (B) 2,5-oxolanylene polymer characterized by including recurring 2,5-oxylanylene (or oxolene) units of the formula ##STR15## wherein at least 60% of the units are joined directly to one another so as to provide segments containing at least six units and wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are individually hydrogen or alkyl groups containing up to 8 carbon atoms
- (2) mixing the resultant mixture with a water soluble polyurethane prepolymer having terminal isocyanate groups capable of being polymerized in the presence of water in a sufficient quantity to form a self-supporting transportable gelled mass.
2 more elements
A composition comprising:
- (1) a chemical component complexed with a chelating agent selected from the group consisting of
- (A) .beta.-hydroxyalkylene amine-containing polymers characterized by having an equivalent weight of hydroxylalkylene amine of 87 to 10,000;
- and
- (B) 2,5-oxolanylene polymer characterized by including recurring 2,5-oxylanylene (or oxolene) units of the formula ##STR23## wherein at least 60% of the units are joined directly to one another so as to provide segments containing at least six units and wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are individually hydrogen or alkyl groups containing up to 8 carbon atoms;
- and
- (2) a gelled mass resulting from the reaction of a water soluble polyurethane prepolymer having terminal isocyanate groups with water.
3 more elements
Dependencies are inferred from the claim text.