Zirconium basic carbonate and methods of making the same
AssigneeRenal Solutions, Inc.
InventorRaymond J. Wong
Life of this patent
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Abstract
Methods of making zirconium basic carbonate are further described which involve titrating an aqueous slurry of sodium zirconium carbonate to a pH of from about 3.5 to about 4.0 with an acidic agent wherein the sodium zirconium carbonate has a moisture content of from about 15% to about 25% LOD in solid form. The process further involves washing the aqueous slurry containing the formed zirconium basic carbonate with water. A novel zirconium basic carbonate is further disclosed which has a minimum adsorption capacity of from about 30 to about 35 mg/PO4-P/gm SCZ; a minimum HCO3- content of from about 2 to about 4 mEq HCO3-gm/SCZ; a leachable Na+ content of from about 1.5 to about 2.0 mEq Na+/gm SCZ; and/or a pH range of titrated sodium zirconium carbonate of from about 6 to about 7.
Claims8
A method of making a zirconium basic carbonate comprising titrating an aqueous slurry of sodium zirconium carbonate to a pH of from about 3.5 to about 4.0 with a acidic agent, wherein said sodium zirconium carbonate has a moisture content of from about 15% to about 25% LOD in solid form;
- and washing said aqueous slurry containing the zirconium basic carbonate with water.
A zirconium basic carbonate having:
- Na+ of less than about 1000 ppm;
- a ZrO2 wt % of from about 35 wt % to about 40 wt %;
- and a CO32− of from about 8 wt % to about 10 wt %, based on the weight of the zirconium basic carbonate.
Dependencies are inferred from the claim text.