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US 10,538,598 B2Granted
Phosphonium-crosslinked chitosan and methods for using and producing the same
AssigneeUTI Limited Partnership
InventorsJosephine M. Hill, Sebastian Sessarego
Life of this patent
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Abstract
The present invention provides phosphonium-crosslinked chitosan (PCC) and methods for using the same for removal of heavy metal-ion(s) from a solution as well as methods for producing said phosphonium-crosslinked chitosan.
Claims18
A phosphonium-crosslinked chitosan (PCC), wherein said PCC has a percentage of grafting of phosphonium-crosslinking of at least 35% and wherein said phosphonium-cross linking moiety comprises tetrakishydroxymethylphosphonium sulfate.
A product produced from the process comprising:
- (i) admixing a reaction mixture comprising chitosan and tetrakishydroxymethylphosphonium (“THP”) salt in the presence of an acid under reaction conditions sufficient to produce a crude phosphonium-crosslinked chitosan (PCC);
- and
- (ii) purifying the crude PCC to produce a purified PCC.
Dependencies are inferred from the claim text.