Compositions – Radioactive compositions – Nuclear reactor fuel
Patent
1989-05-11
1990-08-21
Miller, Edward A.
Compositions
Radioactive compositions
Nuclear reactor fuel
423 10, 210759, G21F 908, C02F 172
Patent
active
049504258
ABSTRACT:
Alkyl phosphates, undiluted or dissolved in hydrophobic solvents can be destroyed in situ by reaction with hydrogen peroxide in the presence of certain transition metal catalyst systems. The invention catalyst system comprises a chromium compound, which dissolves in the aqueous phase, typically an alkali metal chromate, which is employed in conjunction with introduction of an alkali, preferably sodium hydroxide, or in the presence of an alkali buffer to keep the pH of the aqueous phase within a window spanning mildly acidic to mildly alkaline pH during the course of progressive introduction of the hydrogen peroxide, which often lasts from 3 to 10 hours, thereby enabling the oxidation of the alkyl phosphate to continue. The reaction is preferably carried out at a temperature of at least 60.degree. C., and particularly at about 65.degree. to 75.degree. C., or at about the boiling point of the aqueous phase. The window becomes somewhat wider as the reaction temperature increases, the term mildly acidic indicating a pH of at least about pH 6 at around 70.degree. C. to at least pH 5 at around 100.degree. C. Preferably, the solution is maintained at a pH of from 6.5 to 7.5.
REFERENCES:
patent: 3716566 (1973-02-01), Sansoni et al.
patent: 4294703 (1981-10-01), Wilms et al.
patent: 4588506 (1986-05-01), Raymond et al.
patent: 4624792 (1986-11-01), Yamanaka et al.
patent: 4729835 (1988-03-01), McNeillie et al.
Conboy Terence M.
Hutson Graham V.
Rowbottom Kenneth T.
Wilkinson John N. R.
Interox Chemicals Limited
Mai Ngoclan T.
Miller Edward A.
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