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US 8,733,559 B2Granted
Zirconium phosphate particles having improved adsorption capacity and method of synthesizing the same
AssigneeFresenius Medical Care Holdings, Inc.
InventorRaymond June-Hin 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 low molecular weight, oxygen containing, monofunctional, organic additive to the solution, and combining this solution with heated phosphoric acid or a phosphoric acid salt to obtain zirconium phosphate particles by sol gel precipitation.
Claims22
Zirconium phosphate (ZrP) particles having the following characteristics:
- an average particle size of about 45-90 microns,
- a BET surface area of at least 2 m2/g ZrP, and
- an ammonia capacity in dialysate of at least about 15 mg NH4—N/g ZrP, at 20 mg/dL NH4—N.
Zirconium phosphate (ZrP) particles having the following characteristics:
- an average particle size of less than about 5 microns,
- a pore volume of at least 0.0071 mL/g,
- a monolayer volume of at least 0.5 mL/g (STP), and
- a 20-80 nm pore size content of at least 30%.
1 more element
Zirconium phosphate (ZrP) particles having the following characteristics:
- an average particle size of less than about 5 microns,
- a BET surface area of at least 10 m2/g ZrP, and
- an ammonia capacity in dialysate of about 7-9 mg NH4N/g ZrP, at 10 mg/dL NH4—N.
Dependencies are inferred from the claim text.