Patent US2123867A successfully refreshed from Google Patents.
US4574013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for decontaminating soil
Assignee: GALSON RESEARCH Corp A NY CORP
•
Filing: 1985-04-18
•
Granted: 1986-03-04
•
Expires: 2005-04-18
Abstract
Abstract Halogenated contaminants are removed from soil by reaction schemes which are carried out in a slurry of the soil and a reagent mixture. The latter is made up of an alkaline constituent--an alkali metal hydroxide, an alkali metal hydroxide/alcohol or alkali metal hydroxide/glycol mixture, or an alkoxide--and a sulfoxide catalyst.
Inventors
- 👤 Robert L. Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:14
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/30; A62D3/34; B; B09; B09C; B09C1/00; B09C1/08; A62D2101/00; A62D2101/20; A62D2101/22
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
80 words
A method of decontaminating soil contaminated with a halogenated organic compound, said method including the steps of: forming a slurry of the contaminated soil and a reagent mixture comprising a sulfoxide catalyst and an alkali constituent which is: an alkali metal hydroxide, a mixture of an alkali metal hydroxide and an alcohol, or an alkoxide and maintaining said slurry under temperature and pressure conditions which are effective to promote halogen displacement reactions between said halogenated organic compound and the alkali.
Claim 2
Independent Claim
80 words
A method of decontaminating soil contaminated with a halogenated organic compound, said method including the steps of: forming a slurry of the contaminated soil and a reagent mixture comprising a sulfoxide catalyst and an alkali constituent which is: an alkali metal hydroxide, a mixture of an alkali metal hydroxide and an alcohol, or an alkoxide and maintaining said slurry under temperature and pressure conditions which are effective to promote halogen displacement reactions between said halogenated organic compound and the alkali.
Claim 3
Dependent Claim
22 words
A method according to claim 1 in which said slurry is maintained at atmospheric pressure while said halogen displacement reactions are effected.
Claim 4
Dependent Claim
29 words
A method according to claim 1 wherein said slurry is maintained at a temperature in the range of 20° to 220° C. while said halogen displacement reactions are effected.
Claim 5
Dependent Claim
39 words
A method according to claim 1 wherein the halogen displacement reactions are carried out in vacuo to thereby shorten the time required to effect said halogen displacement reactions and/or to keep volatilized contaminants from escaping into the ambient surroundings.
Claim 6
Dependent Claim
17 words
A method according to claim 1 wherein the alkali constituent of the reagent mixture is potassium hydroxide.
Claim 7
Dependent Claim
25 words
A method according to claim 1 wherein the alkali constituent of the reagent mixture is a mixture of an alkali metal hydroxide and benzyl alcohol.
Claim 8
Dependent Claim
14 words
A method according to claim 6 wherein the alkali metal hydroxide is potassium hydroxide.
Claim 9
Dependent Claim
26 words
A method according to claim 1 wherein the alkali constituent of the reagent mixture is a mixture of an alkali metal hydroxide and a polyethylene glycol.
Claim 10
Dependent Claim
29 words
A method according to claim 8 wherein the alkali metal hydroxide is potassium hydroxide and the polyethylene glycol has a molecular weight in the range of 200 to 600.
Claim 11
Dependent Claim
29 words
A method according to claim 1 wherein the alkali metal constituent of the reagent mixture is an alkoxide and said alkoxide is potassium tert butoxide or potassium tert pentoxide.
Claim 12
Dependent Claim
17 words
A method according to claim 1 wherein the sulfoxide catalyst of the reagent mixture is dimethyl sulfoxide.
Claim 13
Dependent Claim
29 words
A method according to claim 1 wherein the ratio of alkali constituent to catalyst in said reagent mixture is in the ratio of 1:4 to 4:1 parts by weight.
Claim 14
Dependent Claim
37 words
A method according to claim 1 wherein the reagent mixture is admixed with the contaminated soil in an amount providing at least two moles of alkali metal constituent per mole of halogenated organic compound in said soil.
Claim 15
Dependent Claim
31 words
A method according to claim 1 which includes the step of agitating said slurry to promote the reactions between the halogenated organic compound and the alkali constituent of the reagent mixture.
Claim 16
Dependent Claim
30 words
A method according to claim 1 wherein the halogenated organic compound is a chlorinated benzene or phenol, a polychlorinated biphenyl, a dioxin, hexachlorobenzene, a polybrominated biphenyl, or a polyhalogenated aliphatic.
Claim 17
Dependent Claim
17 words
A method according to claim 1 wherein the sulfoxide catalyst of the reagent mixture is tetramethylene sulfone.
Claim 18
Dependent Claim
20 words
A method as defined in claim 1 wherein said halogen displacement reactions are carried out in an essentially oxygen-free environment.
Claim 19
Dependent Claim
30 words
A method according to claim 1 wherein the ratio of reagent mixture to soil is in the range of 1.0 part of liquid to 0.5 to 2.0 parts of soil.
Claim 20
Dependent Claim
34 words
A method according to claim 1 which includes the step of washing the soil with water upon completion of the halogen transfer reactions to remove excess reagent mixture and/or halogen transfer reaction products therefrom.
Claim 21
Dependent Claim
25 words
A method according to claim 19 which includes the step of stripping water from said soil upon completion of the step of washing said soil.
Claim 22
Dependent Claim
24 words
A method according to claim 1 wherein the alcohol is a dihydric alcohol selected from the group consisting of ethylene glycol and propylene glycol.
References Cited (Backward Citations)
US3481991A
Cited
US4327027A
Cited
US4337368A
Cited
US4400552A
Cited
US4421649A
Cited
US4351718A
Cited
US4483716A
Cited
US4447541A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-03 | 1989-09-02 | 1990-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-03 | 1993-09-02 | 1994-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-03 | 1997-09-02 | 1998-03-04 | $7700.00 | Window Closed / Lapsed |