Liquid purification or separation – Processes – Liquid/liquid solvent or colloidal extraction or diffusing...
Reexamination Certificate
2006-09-05
2006-09-05
Therkorn, Ernest G. (Department: 1723)
Liquid purification or separation
Processes
Liquid/liquid solvent or colloidal extraction or diffusing...
C210S656000, C423S002000, C423S021100, C423S021500, C423S155000, C423S157000
Reexamination Certificate
active
07101484
ABSTRACT:
A process for purifying a stock Sr-90 solution containing stable and radioactive impurities, holding the purified Sr-90 solution for Y-90 ingrowth, and subsequently extracting the Y-90 from the Sr-90/Y-90 solution. The stock solution is sequentially passed through two thermoxide-type sorbents (T-3and T-5), which hold the impurities while passing the Sr-90 solution. After ingrowth of Y-90, the Sr-90/Y-90 solution is passed through sorbent T-3,which preferentially sorbs the Y-90 while passing the Sr-90 solution. The Y-90 is then eluted from the T-3sorbent. The T-3and T-5sorbents are specially prepared compounds of zirconium dioxide and titanium dioxide, respectively, that preferentially sorb Y-90 under predetermined conditions of solution pH and NaCl concentration.
REFERENCES:
patent: 5368736 (1994-11-01), Horwitz et al.
patent: 5494647 (1996-02-01), Huntley
patent: 6337055 (2002-01-01), Betenekov et al.
patent: 2003/0231994 (2003-12-01), Sylvester
Betenekov Nikolai D.
Brown Roy W.
Sharygin Leonid M.
Becker Robert W
Robert W Becker & Associates
TC International Inc
Therkorn Ernest G.
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