Method of synthesizing zirconium phosphate particles
First Claim
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1. A method of making zirconium phosphate particles comprising:
- (a) combining at least one oxygen-containing additive with zirconium oxychloride in an aqueous solvent to form a solution wherein the oxygen-containing additive forms a complex with zirconium ions in the solution, and(b) combining the solution obtained in (a) with phosphoric acid or a phosphoric acid salt to obtain zirconium phosphate particles by sol gel precipitation,wherein said zirconium oxychloride and said phosphoric acid are introduced at a molar ratio of zirconium oxychloride to phosphoric acid of 1;
2.8 to 1;
3.2.
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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 oxygen-containing additive to the solution, the oxygen-containing additive being selected to form a complex with zirconium ions in the solution of zirconium oxychloride and thereby reduce hydration of the zirconium ions, and combining this solution with phosphoric acid or a phosphoric acid salt to obtain zirconium phosphate particles by sol gel precipitation.
167 Citations
38 Claims
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1. A method of making zirconium phosphate particles comprising:
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(a) combining at least one oxygen-containing additive with zirconium oxychloride in an aqueous solvent to form a solution wherein the oxygen-containing additive forms a complex with zirconium ions in the solution, and (b) combining the solution obtained in (a) with phosphoric acid or a phosphoric acid salt to obtain zirconium phosphate particles by sol gel precipitation, wherein said zirconium oxychloride and said phosphoric acid are introduced at a molar ratio of zirconium oxychloride to phosphoric acid of 1;
2.8 to 1;
3.2. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A method of making zirconium phosphate particles comprising:
adding a solution of zirconium oxychloride and a solution of phosphoric acid simultaneously to a reaction vessel to obtain zirconium phosphate particles by sol gel precipitation. - View Dependent Claims (32, 33, 34, 35, 36)
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37. A method of making zirconium phosphate particles comprising:
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(a) combining at least one oxygen-containing additive with zirconium oxychloride in an aqueous solvent to form a solution wherein the oxygen-containing additive forms a complex with zirconium ions in the solution, and (b) combining the solution obtained in (a) with phosphoric acid or a phosphoric acid salt to obtain zirconium phosphate particles by sol gel precipitation, wherein the oxygen-containing additive is sulfuric acid, sodium sulfate, sodium carbonate, isopropanol, glycerol, sodium lauryl sulfate, tartaric acid, polyvinyl alcohol, 2-amino-2-methyl-propanol, hydroxypropyl cellulose, tetrasodium N-( 1,2-dicarboxyethyl)-N-octadecyl sulfosuccinamate, octylphenoxypolyethoxy(9-10)ethanol, polyethoxylated(20) oleyl alcohol, ethylenediamine alkoxylate block copolymer, or combinations thereof.
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38. A zirconium phosphate composition comprising a water-soluble zirconium phosphate polymer in an aqueous solution, wherein the polymer is formed by combining, in an aqueous solvent, zirconium oxychloride with at least one oxygen-containing additive that is capable of forming a complex with zirconium ions, wherein said zirconium phosphate composition, when dried, has a particle size distribution of less than 20% in the range of >
- 60-120 microns, more than 80% in the range of 30-60 microns, and less than 10% in the range of less than 30 microns,
an ammonia capacity of 15-20 mg NH4-N/gm ZP, and an Na+ content of 3.8-6.2 wt%, based on the weight of the zirconium phosphate particles.
- 60-120 microns, more than 80% in the range of 30-60 microns, and less than 10% in the range of less than 30 microns,
Specification