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US 7,736,507 B2Granted
Method of synthesizing zirconium phosphate particles
AssigneeRenal Solutions, Inc.
InventorRaymond J. Wong
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Abstract
Zirconium phosphate particles are synthesized by providing a solution of zirconium oxychloride in an aqueous solvent, adding at least one oxygen-containing additive to the solution, the oxygen-containing additive being selected to form a complex with zirconium ions in the solution of zirconium oxychloride and thereby reduce hydration of the zirconium ions, and combining this solution with phosphoric acid or a phosphoric acid salt to obtain zirconium phosphate particles by sol gel precipitation.
Claims12
Zirconium phosphate particles comprising the following characteristics:
- a particle size distribution of less than 20% in the range of >60-120 microns, more than 80% in the range of 30-60 microns, and less than 10% in the range of less than 30 microns,
- an ammonia capacity of 15-20 mg NH4-N/gm ZP, and
- an Na+ content of 3.8-6.2 wt %, based on the weight of the zirconium phosphate particles.
Dependencies are inferred from the claim text.