Patent US5667698A successfully refreshed from Google Patents.
US5667698A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reversible flow supercritical reactor and method for operating same
Assignee: 3500764 Canada Inc
•
Filing: 1996-07-26
•
Granted: 1997-09-16
•
Expires: 2016-07-26
Abstract
Abstract A supercritical water oxidation reactor is described having first and second reaction zones connected in series and through which an aqueous feed stream to be oxidized can be passed in either direction. A self-contained heat exchange fluid system allows supercritical and subcritical temperatures to be maintained in either reaction zone. When supercritical water oxidation is occuring in one reaction zone the effluent is being cooled to a subcritical temperature and used to flush the second reaction zone to remove inorganic scale.
Inventors
- 👤 Philip Whiting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:34
CPC Classifications
B; B01; B01J; B01J3/00; B01J3/008; C; C02; C02F; C02F11/00; C02F11/06; C02F11/08; C02F11/086; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/54
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
140 words
A method of supercritical oxidizing an aqueous feed stream containing organic compounds comprising: a) supplying an aqueous feed stream containing organic compounds and an oxidant to a first reaction zone in a reactor having first and second reaction zones connected in series; b) transferring heat using a self-contained heat exchange fluid system so as to maintain supercritical conditions in said first reaction zone and subcritical conditions in said second reaction zone to dissolve inorganic scale in said second reaction zone; c) periodically reversing the flow of the feed stream through said reactor by supplying the feed stream to said second reaction zone and transferring heat using a self-contained heat exchange fluid system so as to maintain supercritical conditions in said second reaction zone and subcritical conditions in said first reaction zone to dissolve inorganic scale in said first reaction zone.
Claim 2
Independent Claim
140 words
A method of supercritical oxidizing an aqueous feed stream containing organic compounds comprising: a) supplying an aqueous feed stream containing organic compounds and an oxidant to a first reaction zone in a reactor having first and second reaction zones connected in series; b) transferring heat using a self-contained heat exchange fluid system so as to maintain supercritical conditions in said first reaction zone and subcritical conditions in said second reaction zone to dissolve inorganic scale in said second reaction zone; c) periodically reversing the flow of the feed stream through said reactor by supplying the feed stream to said second reaction zone and transferring heat using a self-contained heat exchange fluid system so as to maintain supercritical conditions in said second reaction zone and subcritical conditions in said first reaction zone to dissolve inorganic scale in said first reaction zone.
Claim 3
Dependent Claim
13 words
The method of claim 1 in which the reactor is a pipe reactor.
Claim 4
Dependent Claim
58 words
The method of claim 2 in which the self-contained heat exchange fluid system comprises a heat exchange reservoir, heat exchangers defining at least 3 heat exchange zones along said reactor and defining said reaction zones and means to allow heat exchange fluid from said reservoir to be transferred to and from and between each of said heat exchangers.
Claim 5
Dependent Claim
15 words
The method of claim 3 in which the heat exchange fluid is at low pressure.
Claim 6
Dependent Claim
17 words
The method of claim 4 in which the heat exchangers are shells in contact with the reactor.
References Cited (Backward Citations)
US2665249A
Cited
US2944396A
Cited
US4292953A
Cited
US4338199A
Cited
US4543190A
Cited
US4338199B1
Cited
US4822497A
Cited
US5100560A
Cited
US5252224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-09-15 | 2001-03-17 | 2001-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-09-15 | 2005-03-17 | 2005-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-09-15 | 2009-03-17 | 2009-09-16 | $7700.00 | Window Closed / Lapsed |