Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2005-08-30
2005-08-30
Langel, Wayne A. (Department: 1754)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S903000, C423S181000, C423S308000, C423S309000, C423S311000
Reexamination Certificate
active
06936175
ABSTRACT:
The invention relates to zirconium phosphate of H form which is characterized by a31P NMR spectra comprising peaks at −4.7 ppm, −12.8 ppm and −17.0 ppm (all peaks being in a range of ±0.5 ppm). Also featured is a Na form of the material. The zirconium phosphate material is characterized by a unique surface area, pore size distribution and surface morphology, as well as by an affinity for NH4+ions and moisture insensitivity. Also featured is hafnium phosphate characterized by moisture insensitivity. The zirconium phosphate may be amorphous and possess a framework-type structure. The inventive method of making zirconium phosphate includes the steps of heating an aqueous mixture including a zirconium compound and a phosphorous-containing reagent at a temperature of at least 120° C. to form a reaction product, and treating the reaction product with acid at a temperature of at least 60° C.
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Bortun Anatoly I.
Butler Clive J.
Langel Wayne A.
Magnesium Elektron Inc.
Pearne & Gordon LLP
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