Liquid purification or separation – Processes – Ion exchange or selective sorption
Reexamination Certificate
2005-07-19
2005-07-19
Hopkins, Robert A. (Department: 1724)
Liquid purification or separation
Processes
Ion exchange or selective sorption
C210S681000, C423S610000
Reexamination Certificate
active
06919029
ABSTRACT:
A method for producing a surface-activated crystalline titanium oxide product having a high adsorptive capacity and a high rate of adsorption with respect to dissolved contaminants includes the steps of preparing a titanium oxide precipitate from a mixture comprising a hydrolysable titanium compound and heating the precipitate at a temperature of less than 300° C., without calcining the precipitate. Preferably, the titanium oxide product includes crystalline anatase having primary crystallite diameters in the range of 1-30 nm. The surface-activated crystalline titanium oxide product is used in methods to remove dissolved inorganic contaminants from dilute aqueous streams by suspending the product in an aqueous stream or by filtering an aqueous stream through a bed of the product. In another method, a hydrolysable titanium compound is added to an aqueous stream so that titanium oxides form as a co-precipitate with dissolved contaminants within a bed of particulate material.
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Kerr-McGee Chemicals LLC Product
Christodoulatos Christos
Dadachov Mazakhir
Korfiatis George P.
Meng Xiaoguang
Hopkins Robert A.
McCarter & English LLP
Trustees of Stevens Institute of Technology
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