Patent US4020031A successfully refreshed from Google Patents.
US5118429A
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Ambient temperature destruction of PCB wastes
Assignee: Concordia University
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Filing: 1990-10-29
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Granted: 1992-06-02
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Expires: 2010-10-29
Abstract
Abstract There is disclosed a process for destroying halogenated hydrocarbons such as PCBs and PCBs in PCB containing fluids (e.g., Askarel) and oils (e.g., paraffin oil, transformer oil, etc.) at ambient temperature. The process comprises reacting halogenated hydrocarbons, such as PCB containing fluids or oils with a solid oxidant in the presence of a concentrated acid. Preferably, the solid oxidant is potassium permanganate and the concentrated acid is sulfuric acid. Destruction efficiency is as high as 99.95%.
Inventors
- 👤 Perry D. Anderson
- 👤 Bhuvan C. Pant
- 👤 Zhendi Wang
- 👤 Cooper H. Langford
- 👤 Prasad Aysola
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:41
CPC Classifications
A; A62; A62D; A62D3/00; A62D3/30; A62D3/38; A62D2101/00; A62D2101/20; A62D2101/22; Y; Y10; Y10S; Y10S210/00; Y10S210/902; Y10S210/908; Y10S210/909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
65 words
Process for the destruction of PCBs, which comprises reacting said PCBs with an amount of a solid oxidant sufficient to destroy substantially all said PCBs, wherein said oxidant is selected from the group consisting of potassium permanganate, oxides of manganese, chromium and vanadium, chromates and dichromates, in the presence of a concentrated mineral acid at ambient temperature, until substantially all said PCBs have been destroyed.
Claim 2
Dependent Claim
65 words
Process for the destruction of PCBs, which comprises reacting said PCBs with an amount of a solid oxidant sufficient to destroy substantially all said PCBs, wherein said oxidant is selected from the group consisting of potassium permanganate, oxides of manganese, chromium and vanadium, chromates and dichromates, in the presence of a concentrated mineral acid at ambient temperature, until substantially all said PCBs have been destroyed.
Claim 3
Dependent Claim
28 words
Process according to claim 1, wherein said PCB's are selected from the group consisting of PCBs, PCBs in fluids, PCBs in paraffin oil and PCBs in transformer oil.
Claim 4
Dependent Claim
12 words
Process according to claim 1, wherein said solid oxidant comprises potassium permanganate.
Claim 5
Dependent Claim
11 words
Process according to claim 1, wherein the acid comprises sulfuric acid.
Claim 6
Dependent Claim
27 words
Process according to claim 1, wherein the PCB's are present in a solid, liquid or gaseous matrix, for reaction with said solid oxidant and said concentrated acid.
Claim 7
Dependent Claim
19 words
Process according to claim 1, wherein the solid oxidant and the concentrated acid are supported on a solid support.
Claim 8
Dependent Claim
23 words
Process according to claim 6, wherein said solid support is selected from the group consisting of alumina, titania, silica, zeolites, clays and ceramics.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-06-02 | 1995-12-02 | 1996-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-06-02 | 1999-12-02 | 2000-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-06-02 | 2003-12-02 | 2004-06-02 | $7700.00 | Window Closed / Lapsed |