Sodium zirconium carbonate and zirconium basic carbonate and methods of making the same
AssigneeRenal Solutions, Inc.
InventorRaymond J. Wong
Life of this patent
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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.
Claims30
A method of making a sodium zirconium carbonate free of OH groups comprising heating a mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate free of OH groups.
A method of making sodium zirconium carbonate comprising mixing zirconium oxychloride with soda ash and agitating to form a solution mixture at ambient temperatures;
- heating said mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate, wherein said sufficient temperature is the boiling temperature of the mixture of zirconium oxychloride and soda ash;
- after said heating, filtering off the sodium zirconium carbonate;
- after filtering, washing any chloride or any impurities from said sodium zirconium carbonate;
- titrating an alkaline slurry comprising said sodium zirconium carbonate with at least one acidic agent to obtain a pH of less than about 7.0;
- after titrating, filtering off said sodium zirconium carbonate and washing said sodium zirconium carbonate;
- and after washing, drying said sodium zirconium carbonate.
A sodium zirconium carbonate comprising 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, based on the weight of the sodium zirconium carbonate.
A method of making a sodium zirconium carbonate comprising:
- heating a mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate;
- and
- titrating an alkaline slurry comprising said sodium zirconium carbonate with at least one acidic agent to obtain a pH of less than about 7.0.
A method of making a sodium zirconium carbonate comprising:
- heating a mixture of zirconium oxychloride and soda ash at a sufficient temperature and for a sufficient time to form said sodium zirconium carbonate, wherein said heating occurs at a heating rate of from about 0.5° F. to about 1° F./minute until boiling temperature of said mixture.
Dependencies are inferred from the claim text.