Polysaccharide-Polyamine Copolymers For Removal Of Phosphate
AssigneeHoward University
InventorsJames W. Mitchell, Dazhi Yang
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Abstract
Covalently cross-linked copolymers are described herein. More specifically, polysaccharide-polyamine copolymeric matrices or structures and cationic copolymeric matrices are described herein. The polysaccharide-polyamine copolymers, when protonated, can form cationic copolymeric matrices having exceptionally high densities of cationic sites. In one form, the covalently cross-linked copolymers provide a three-dimensional structure, especially when hydrated.
Claims35
A polysaccharide-polyamine copolymer having an amino functionality which will provide a protonatable copolymeric material having a three-dimensional structure with cationic sites through protonation, the polysaccharide-polyamine copolymer comprising:
- a selectively oxidized polysaccharide having a 2,3-dialdehyde moiety;
- and
- amino polymers which provide an amino functionality, the amino polymers cross linking the oxidized polysaccharides to provide a particulate polysaccharide-polyamine copolymer having an amino functionality which when protonated will provide the cationic copolymeric material with a nitrogen content of at least 12.3 wt. %, both the polysaccharide-polyamine copolymer and cationic copolymeric material being water insoluble.
A method of making a polysaccharide-polyamine copolymer and copolymeric materials which when protonated have cationic sites, the method comprising:
- reacting selectively oxidized polysaccharides having a 2,3 di-aldehyde moieties with amino polymers, the reaction providing a particulate polysaccharide-polyamine copolymer and copolymeric material having an amino functionality in an amount which when protonated provides a cationic copolymeric material with a nitrogen content of at least 12.3 wt. %, based upon the weight of the cationic copolymeric material, both the polysaccharide-polyamine copolymer and copolymeric material being water insoluble.
A method to effect removal of phosphate from an aqueous phosphate solution, the method comprising applying a protonated particulate polysaccharide-polyamine copolymeric material having a three-dimensional structure, the particulate polysaccharide-polyamine polymeric material comprising:
- selectively oxidized polysaccharide having a 2,3 di-aldehyde moiety;
- and
- amino polymers which provide a cationic amino functionality, the amino polymers covalently cross linking the selectively oxidized polysaccharide to provide a particulate polysaccharide-polyamine copolymer and copolymeric material having an amino functionality which when protonate will provide the cationic copolymeric material with a nitrogen content of at least 12.3 wt. %, the cationic particulate polysaccharide-polyamine copolymer and cationic copolymeric material being water insoluble.
A cationic copolymeric material comprising a protonated polysaccharide-polyamine copolymer having a three-dimensional structure, the polysaccharide-polyamine copolymer material comprising:
- selectively oxidized polysaccharide having a 2,3 di-aldehyde moiety;
- and
- amino polymers which provide a cationic amino functionality, the amino polymers covalently cross linking the oxidized polysaccharide to provide a particulate polysaccharide-polyamine copolymer and copolymeric material having an amino functionality which when protonated will provide the cationic copolymeric material with a nitrogen content of at least 12.5 wt. %, the cationic copolymer and cationic polymeric material being water insoluble.
Dependencies are inferred from the claim text.