Sodium zirconium carbonate compound and the method of its preparation
AssigneeOrganon Teknika Corporation
InventorsMary J. McArthur, Laurence B. Marantz, Abb L. Scarbrough
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Abstract
There is disclosed a sodium zirconium carbonate compound and the method of its preparation. The sodium zirconium carbonate compound is formed from a metastable aqueous solution comprising zirconium, sodium, sulfate, and carbonate ions.
Claims39
A particulate sodium zirconium carbonate hydrate product which is substantially water insoluble and non-crystalline having an ionic composition corresponding to analysis, exclusive of water of hydration, as follows:
- (Na).sub.A (Zr).sub.B (CO.sub.3).sub.C
- wherein, when B, determined as ZrO.sub.2, is assigned the value 1, A has a value of from about 0.8 to about 1.2 and C, determined as CO.sub.2, has a value of from about 0.8 to about 1.2, having a substantially non-uniform particle size.
A particulate non-crystalline, substantially water insoluble sodium zirconium hydrate product having a substantially non-uniform particle size and an ionic composition corresponding to analysis, exclusive of water of hydration, of:
- (NA).sub.A (Zr).sub.B (CO.sub.3).sub.C
- wherein, when B determined as ZrO.sub.2, is assigned the value 1, A has a value of from about 0.8 to about 1.2, and C, determined as CO.sub.2, has a value of from about 0.8 to about 1.2, said product being formed by the process comprising the steps of:
- (1) preparing a metastable solution comprising zirconium, sodium, sulfate and carbonate ions and having a pH of about 11.5, the molar ratios of said sodium, sulfate and carbonate ions to each zirconium ion being within the ranges of from about 6 to about 10, from about 2 to about 3 and from about 2 to about 4 respectively and the concentration of said zirconium ions in said solution being from about 0.3 molar to about 0.9 molar, wherein said solution may further comprise chloride ions which when present do not exceed a molar ratio of about 2 chloride ions to one zirconium ion;
- (2) heating said metastable solution to greater than about 90.degree. C.;
- and
- (3) holding said solution at greater than about 90.degree. C. for sufficient time to allow formation of said product.
The method for the preparation of a particulate sodium zirconium carbonate hydrate product having a substantially non-uniform particle size and an ionic composition corresponding to analysis, exclusive of water of hydration, as follows:
- (NA).sub.A (Zr).sub.B (CO.sub.3).sub.C
- wherein, when B, determined as ZrO.sub.2 is assigned the value 1, A has a value of from about 0.8 to about 1.2, and C, determined as CO.sub.2, has a value of from about 0.8 to about 1.2, said method comprising the steps of:
- (a) preparing a metastable solution comprising zirconium, sodium, sulfate and carbonate ions and having a pH of from about 8 to about 11.5, the molar ratios of said sodium, sulfate and carbonate ions to each zirconium ion in said solution being within the ranges of from about 6 to about 10, from about 2 to about 3 and from about 2 to about 4 respectively and the concentration of said zirconium ions in said solution being from about 0.3 molar to about 0.9 molar, wherein said solution may further comprise chloride ions which when present do not exceed a molar ratio of about 2 chloride ions to one zirconium ion;
- (b) heating said metastable solution about 0.3.degree. to about 0.5.degree. C. per minute to greater than about 90.degree. C;
- and
- (c) holding said solution at greater than about 90.degree. C. for sufficient time to allow formation of said product.
The method of preparing a clear metastable solution comprising zirconium, sodium, sulfate and carbonate ions and having a pH of from about 9.5 to about 10;
- the molar ratios of said sodium, sulfate and carbonate ions to each zirconium ions in said solution being within the ranges of from about 6 to about 10, from about 2 to about 3 and from about 2 to about 4, respectively, and the concentration of said zirconium ions in said solution being from about 0.3 molar to about 0.9 molar, wherein said solution may further comprise chloride ions which when present do not exceed a molar ratio of about 2 chloride ions to one zirconium ion;
- said method comprising the step of adjusting the pH of an aqueous solution of a water-soluble zirconium compound to from about 8 to about 11.5 by adding said solution to an aqueous solution of a base selected from the group consisting of carbonates of sodium and mixtures thereof.
The method of preparing a clear metastable solution comprising zirconium, sodium, sulfate and carbonate ions and having a pH of from about 9.5 to about 10;
- the molar ratios of said sodium, sulfate and carbonate ions to each zirconium ion in said solution being within the ranges of from about 6 to about 10, from about 2 to about 3 and from about 2 to about 4, respectively, and the concentration of said zirconium ions in said solution being from about 0.3 molar to about 0.9 molar, wherein said solution may further comprise chloride ions which when present do not exceed a molar ratio of about 2 chloride ions to one zirconium ion;
- said method comprising the steps of:
- (a) partially neutralizing an aqueous solution of a water-soluble zirconium compound to a pH of about 1.6 with an aqueous solution of a base selected from the group consisting of carbonates of sodium, sodium hydroxide and mixtures thereof to form a zirconium solution;
- and
- (b) adjusting the pH of the said zirconium solution to form about 8 to about 11.5 by adding it to an aqueous solution of a base selected from the group consisting of carbonates of sodium and mixtures thereof.
Dependencies are inferred from the claim text.