US4624792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for treating radioactive organic wastes
Assignee: JGC Corp
•
Filing: 1983-12-12
•
Granted: 1986-11-25
•
Expires: 2003-12-12
Abstract
Abstract Radioactive organic wastes such as anion-exchange resins, chelate resins and organic filter sludges are readily oxidized by reacting hydrozen peroxide in an aqueous medium in the presence of iron-ions or both iron-ions and cation-exchange resin to be decomposed to carbon dioxide and water. Contact between the wastes to be decomposed and hydrogen peroxide is preferably conducted by continuously feeding hydrogen peroxide or both hydrogen peroxide and the wastes to be decomposed to the reaction zone.
Inventors
- 👤 Akihiro Yamanaka
- 👤 Masami Toshikuni
- 👤 Kazunori Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:25
CPC Classifications
G; G21; G21F; G21F9/00; G21F9/28; G21F9/30; C; C02; C02F; C02F1/00; C02F1/72; C02F1/722; C02F2101/00; C02F2101/006; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
84 words
A method for treating radioactive organic wastes containing anionic exchange resins which comprises decomposing the wastes by oxidizing treatment with at least 2 gr/hour of hydrogen peroxide per gr of waste at a temperature below 100° C. with a catalyst system comprising (a) salts containing ferrous or ferric ions at a concentration of 0.01 to 0.05 moles per liter and (b) an organic cation exchange resin in an amount of at least 1% by weight based on the organic solid wastes to be decomposed.
Claim 2
Independent Claim
84 words
A method for treating radioactive organic wastes containing anionic exchange resins which comprises decomposing the wastes by oxidizing treatment with at least 2 gr/hour of hydrogen peroxide per gr of waste at a temperature below 100° C. with a catalyst system comprising (a) salts containing ferrous or ferric ions at a concentration of 0.01 to 0.05 moles per liter and (b) an organic cation exchange resin in an amount of at least 1% by weight based on the organic solid wastes to be decomposed.
Claim 3
Dependent Claim
75 words
A method for treating radioactive organic wastes according to claim 1 wherein hydrogen peroxide is continuously fed, as an aqueous solution with a concentration from 30 to 60% by weight, in the form of liquid, or after being changed to gas, at a rate of between 2 and 40 gr/hour per 1 gr(dry basis) of the wastes to be decomposed, to an aqueous medium in the presence of both an iron-ion and a cation-exchange resin.
Claim 4
Dependent Claim
29 words
A method according to claim 2 in which the continuous decomposition by oxidation of the wastes is carried out at a waste concentration of from 1 to 10% (w/v).
Claim 5
Dependent Claim
29 words
A method according to claim 1 in which the amount of the cation-exchange resin is 10% or more by weight, based on the organic solid wastes to be decomposed.
Claim 6
Dependent Claim
28 words
A method according to claim 1, in which the oxidative decomposition reaction is carried out in an aqueous medium with a pH value ranging from 1.5 to 10.
Claim 7
Dependent Claim
29 words
A method according to claim 1, in which the oxidative decomposition reaction is promoted by stirring with hydrogen peroxide, which is fed from the bottom of the reaction vessel.
References Cited (Backward Citations)
US3716566A
Cited
JPS5447357A
Cited
US4321143A
Cited
JPS5834080A
Cited
US4437999A
Cited
JPS5852599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-11-24 | 1990-05-26 | 1990-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-24 | 1994-05-26 | 1994-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-24 | 1998-05-26 | 1998-11-25 | $7700.00 | Window Closed / Lapsed |