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US 4,734,216 AGranted
Composition and method for flocculating and removing solids suspended in water
AssigneeDearborn Chemical Company
InventorsDavid W. Kelly, Stewart N. Paul, John E. Waller
Life of this patent
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Abstract
A composition and method are described for flocculating and removing solids suspended in water using an inorganic component containing iron, aluminum, or a mixture thereof in combination with a tannin-based flocculant produced by reacting a condensed tannin with an amino compound and an aldehyde. The tannin-based flocculant is preferably the product of a controlled reaction in which the viscosity is monitored as an indication of suitable shelf life.
Claims20
A composition of matter for treating water to flocculate and remove solids suspended therein comprising:
- (a) a tannin-based flocculant with a modified tannin produced by reacting a condensed tannin with an amino compound and an aldehyde;
- and
- (b) an inorganic flocculant selected from the group consisting of inorganic flocculants comprising aluminum, iron, or mixtures thereof.
Dependencies are inferred from the claim text.