Zirconium phosphate and method of making the same
US6818196B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 30, 2003 |
| Grant date | Nov 16, 2004 |
| Priority date | — |
| Expiry date | Jul 30, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/82
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method of making sodium zirconium carbonate is described which involves forming a mixture of zirconium oxychloride with soda ash and then heating at a sufficient temperature and for a sufficient time to form the sodium zirconium carbonate. Subsequent washing and filtration steps can further form parts of this process. A novel sodium zirconium carbonate is further described which contains from about 2 wt % to about 5 wt % Na+; from about 44 wt % to about 50 wt % ZrO2; from about 12 wt % to about 18 wt % CO32−; and from about 32 wt % to about 35 wt % H2O. 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…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.