Patent US4975198A successfully refreshed from Google Patents.
US4975198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the removal of organic contaminants from soils and sediment
Assignee: Individual
•
Filing: 1988-07-14
•
Granted: 1990-12-04
•
Expires: 2008-07-14
Abstract
Abstract A process for the decontamination of materials such as soil, sediments and sludges contaminated with organic contaminants such as PCB's. The process comprises the steps of separating the material into a solid fraction and a liquid fraction when liquid is present leaching the solid fraction with a leaching solvent to obtain contaminated leaching solvent and a mixture of decontaminated solids and leaching solvent and stripping the contaminant, from the contaminated leaching solvent with a stripping solvent to concentrate the contaminants. When liquid is present in the material, adsorbing residual contaminants from the liquid fraction are adsorbed onto decomtaminated solids to produce decontaminated liquids and contaminated solids.
Inventors
- 👤 Werner Steiner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:29
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/26; B; B01; B01D; B01D11/00; B01D11/02; B01D11/028; B09; B09C; B09C1/00; B09C1/02; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A process for the decontamination of materials including solids contaminated with organic contaminants, the process comprising the steps of: (a) separating the material into a solid fraction; (b) leaching the solid fraction with a leaching solvent to obtain a contaminated leaching solvent and a mixture of decontaminated solid fraction and leaching solvent, said leaching solvent consisting essentially of a hydrophilic solvent or mixture thereof, miscible in water; and (c) adding water to the contaminated leaching solvent from step (b) and (d) stripping contaminant from the contaminated leaching solvent and water mixture from step (c) with a stripping solvent which is immiscible with the leaching solvent and water mixture, to concentrate the contaminant.
Claim 2
Dependent Claim
112 words
A process for the decontamination of materials including solids contaminated with organic contaminants, the process comprising the steps of: (a) separating the material into a solid fraction; (b) leaching the solid fraction with a leaching solvent to obtain a contaminated leaching solvent and a mixture of decontaminated solid fraction and leaching solvent, said leaching solvent consisting essentially of a hydrophilic solvent or mixture thereof, miscible in water; and (c) adding water to the contaminated leaching solvent from step (b) and (d) stripping contaminant from the contaminated leaching solvent and water mixture from step (c) with a stripping solvent which is immiscible with the leaching solvent and water mixture, to concentrate the contaminant.
Claim 3
Dependent Claim
59 words
The process according to claim 1, wherein step (a) comprises separating the material into a solid fraction and a liquid fraction with residual contaminant and further comprising separating said decontaminated solid fraction from said leaching solvent and adsorbing residual contaminant from the liquid fraction onto the decontaminated solid fraction to produce a decontaminated liquid fraction and contaminated solid fraction.
Claim 4
Dependent Claim
22 words
The process according to claim 2, comprising adding the contaminated solid fraction to the solid fraction to be leached in step (b).
Claim 5
Dependent Claim
36 words
The process according to claim 1, further comprising stripping the leaching solvent from the mixture produced in step (b) to produce a decontaminated solid fraction; and recycling the stripped leaching solvent into the leaching step (b).
Claim 6
Dependent Claim
59 words
The process according to claim 4, wherein step (a) comprises separating the material into a solid fraction and a liquid fraction with residual contaminant and further comprising separating said decontaminated solid fraction from said leaching solvent, and adsorbing residual contaminant from the liquid fraction onto the decontaminated solid fraction to produce a decontaminated liquid fraction and contaminated solid fraction.
Claim 7
Dependent Claim
36 words
The process according to claim 1, further comprising separating the contaminants from the contaminated stripping solvent of step (c) to produce a decontaminated stripping solvent; and recycling the decontaminated stripping solvent to the stripping step (c).
References Cited (Backward Citations)
DE1517685A1
Cited
US4144162A
Cited
US4400552A
Cited
US4421649A
Cited
US4326090A
Cited
US4464351A
Cited
US4351719A
Cited
US4334102A
Cited
US4405509A
Cited
US4501446A
Cited
US4422940A
Cited
US4477354A
Cited
US4549966A
Cited
US4417977A
Cited
US4483716A
Cited
US4430208A
Cited
US4532028A
Cited
US4606774A
Cited
US4595509A
Cited
US4662948A
Cited
US4574013A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-12-03 | 1994-06-04 | 1994-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-03 | 1998-06-04 | 1998-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-03 | 2002-06-04 | 2002-12-04 | $7700.00 | Window Closed / Lapsed |