Patent US3904549A successfully refreshed from Google Patents.
US3904549A
Expired / Lapsed
US
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Fluidized bed regeneration of powdered activated carbon
Assignee: Dorr Oliver Inc
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Filing: 1973-11-23
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Granted: 1975-09-09
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Expires: 1993-11-23
Abstract
Abstract Spent powdered carbon is regenerated in a submerged combustion type fluid bed reactor to produce activated powdered carbon.
Inventors
- 👤 William W Barton
- 👤 Thomas D Heath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:32
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/36
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
A FLUID BED PROCESS FOR REGENERATING POWDERED ACTIVATED CARBON HAVING ADSORBED ORGANICS THEREON BY VOLATILIZING OR OXIDIZING SAID ORGANICS AT A TEMPERATURE IN THE RANGE FROM ABOUT 1,150*F TO ABOUT 1,500*F, COMPRISING THE STEPS OF FLUIDIZING A BED OF PARTICULATE INERT MATERIAL BY PASSING A PRIMARY FLOW OF SUBSTANTIALLY OXYGEN-FREE GAS THROUGH A CONSTRICTION PLATE SUPPORTING SAID BED, CHARGING A WATER SLURRY OF SPENT CARBON INTO THE FLUIDIZED BED, INTRODUCING THROUGH A BURNER TUBE A SECONDARY FLOW OF HOT COMBUSTION GASES CONTAINING A CONTROLLED AMOUNT OF EXCESS OXYGEN THEREIN DIRECTLY INTO THE FLUIDIZED BED AT A LOCATION WITHIN THE FLUIDIZED BED AND SUBSTANTIALLY ABOVE SAID CONSTRICTION PLATE TO RAISE THE BED TEMPERATURE TO THE DESIRED RANGE AND THEREBY VOLATILIZE THE ORGANIS AND TO OXIDIZE NONVOLATILE ADSORBSATES, REMOVING THE REACTIVATED CARBON POWDER FROM THE REACTOR BY ELUTRIATION WITH THE REACTOR EXHAUST GASES, SEPARATING THE CARBON POWDER FROM THE EXHAUST GASES AND RECOVERING THE POWDERED ACTIVATED CARBON.
Claim 2
Dependent Claim
155 words
A FLUID BED PROCESS FOR REGENERATING POWDERED ACTIVATED CARBON HAVING ADSORBED ORGANICS THEREON BY VOLATILIZING OR OXIDIZING SAID ORGANICS AT A TEMPERATURE IN THE RANGE FROM ABOUT 1,150*F TO ABOUT 1,500*F, COMPRISING THE STEPS OF FLUIDIZING A BED OF PARTICULATE INERT MATERIAL BY PASSING A PRIMARY FLOW OF SUBSTANTIALLY OXYGEN-FREE GAS THROUGH A CONSTRICTION PLATE SUPPORTING SAID BED, CHARGING A WATER SLURRY OF SPENT CARBON INTO THE FLUIDIZED BED, INTRODUCING THROUGH A BURNER TUBE A SECONDARY FLOW OF HOT COMBUSTION GASES CONTAINING A CONTROLLED AMOUNT OF EXCESS OXYGEN THEREIN DIRECTLY INTO THE FLUIDIZED BED AT A LOCATION WITHIN THE FLUIDIZED BED AND SUBSTANTIALLY ABOVE SAID CONSTRICTION PLATE TO RAISE THE BED TEMPERATURE TO THE DESIRED RANGE AND THEREBY VOLATILIZE THE ORGANIS AND TO OXIDIZE NONVOLATILE ADSORBSATES, REMOVING THE REACTIVATED CARBON POWDER FROM THE REACTOR BY ELUTRIATION WITH THE REACTOR EXHAUST GASES, SEPARATING THE CARBON POWDER FROM THE EXHAUST GASES AND RECOVERING THE POWDERED ACTIVATED CARBON.
Claim 3
Dependent Claim
39 words
THE PROCESS OF CLAIM 1 WHEREIN SAID HOT COMBUSTION GASES DO NOT TRAVERSE SAID CONSTRICTION PLATE AND SAID EXCESS OXYGEN IS PRESENT IN SAID HOT COMBUSTION GASES IN AN EFFECTIVE AMOUNT OF UP TO ABOUT 5 TO 10 PERCENT.
Claim 4
Dependent Claim
20 words
The process of claim 2 wherein the fluidizing gas for the inert bed of particulate material is recycled stack gas
Claim 5
Dependent Claim
25 words
The process of claim 3 wherein stack gas for fluidizing the bed is first passed in heat exchange with the exhaust gases from the reactor.
Claim 6
Dependent Claim
26 words
The process of claim 3 wherein separation of the reactivated carbon powder from the reactor exhaust gases is effected by scrubbing the exhaust gases with water.
Claim 7
Dependent Claim
23 words
The process of claim 5 wherein the water used in scrubbing the exhaust gases is the secondary effluent of an activated sludge process.
Claim 8
Dependent Claim
37 words
The process of claim 3 wherein a quantity of recycled stack gas is mixed with said hot combustion gases prior to introduction into said fluidized bed to temper said combustion gases without introducing oxygen into said bed.
Claim 9
Dependent Claim
52 words
The process of claim 1 wherein the fluidizing gas for the inert bed of particulate material is recycled stack gas and wherein at least a portion of the oxygen required in the fluid bed is introduced into the substantially oxygen-free recycled stack gas before said stack gas is passed into said bed.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |