US3910849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacture of activated carbon and apparatus therefor
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1974-01-04
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Granted: 1975-10-07
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Expires: 1994-01-04
Abstract
Abstract At least two horizontal perforated plates are vertically spaced. A powdered or granular carbonaceous substance is fed onto the lowermost of the perforated plates and, at the same time, a hot activating gas is introduced upwardly from below the lowermost horizontal perforated plate so that the activated portion of said powdered or granular carbonaceous substance is allowed to ascend to and form a fluidized bed on successively higher perforated plates. The activated carbon of the highest grade of quality collects on the uppermost perforated plate as the final product. The manufacture of activated carbon described above is accomplished by use of an apparatus which comprises, in combination, at least two horizontal perforated plates having holes of a fixed diameter distributed at a fixed rate, two inlets disposed at a lower part of the apparatus, one for admitting the carbonaceous substance and the other for permitting introduction of the activating gas, and two outlets disposed at an upper part of the apparatus, one for discharging the activated carbon as the product and the other for releasing the spent activating gas.
Inventors
- 👤 Jun-Ichi Kawabata
- 👤 Yonesiro Tazaki
- 👤 Shigeo Mitsui
- 👤 Kazuhiko Niikawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:48
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/26; B01J8/28; C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/336
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
288 words
A METHOD FOR THE MANUFACTURE OF AN ACTIVATED CARBON FROM A POWDERED OR GRANULAR CARBONACEOUS SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF COAL, WOOD DUST, BARK, AND COCONUT HUSK COMPRISING THE STEPS OF FEEDING THE POWDERED OR GRANULAR CARBONACEOUS SUBSTANCE ONTO THE LOWERMOST OF AT LEAST TWO HORIZONTAL PERFORATED PLATES VERTICALLY SPACED WITHIN A SUBSTANTIALLY UNIFORM DIAMETER COLUMN, SAID HORIZONTAL PERFORATED PLATES BEING SO ADAPTED THAT THE DIAMETER OF THE HOLES PIERCED THROUGH THE LOWERMOST HORIZONTAL PERFORATED PLATE IS 1 TO 2 MM AND THE HOLE RATIO THEREOF IS 0.5 TO 2.% AND THE DIAMETER OF THE HOLES PIERCED THROUGH THE SECOND AND SUBSEQUENT HORIZONTAL PERFORATED PLATES IS 2 TO 4 TIMES THE MAXIMUM DIAMETER OF THE PARTICLES OF CARBONACEOUS SUBSTANCE AND THE HOLE RATIO THEREOF IS 20 TO 30%, AND AT THE SAME TIME CAUSING A HOT ACTIVATING GAS TO ASCEND FROM BELOW SAID LOWERMOST HORIZONTAL PERFORATED PLATE, THE FLOW VELOCITY OF SAID ACTIVATING GAS BEING FROM 3 TO 10 TIMES THE MINIMUM FLOW VELOCITY REQUIRED FOR FLUIDIZING THE CARBONACEOUS SUBSTANCE, THEREBY FORMING A FLUIDIZED BED OF POWDERED OR GRANULAR CARBONACEOUS SUBSTANCE ON EACH OF SAID HORIZONTAL PERFORATED PLATES AND ALLOWING ONLY THE PORTION OF CARBONACEOUS PARTICLES WHICH HAVE HAD THEIR DIAMETER REDUCED IN CONSEQUENCE TO THE RESULTANT ACTIVATION IN ONE OF SAID FLUIDIZED BEDS TO PASS THROUGH A NEXT HIGHER HORIZONTAL PERFORATED PLATE IN CONJUNCTION WITH THE ASCENDING ACTIVATING GAS AND, AFTER THE ACTIVATING GAS ENTRAINING THE ACTIVATED CARBONACEOUS SUBSTANCE HAS REACHED THE FLUIDIZED BED FORMED ON THE UPPERMOST HORIZONTAL PERFORATED PLATE, PERMITTING THE GAS TO BE SEPARATED FROM THE ACTIVATED CARBONACEOUS SUBSTANCE AND TO DISCHARGE THROUGH THE TOPMOST PORTION OF THE COLUMN, AND SEPARATELY RECOVERING THE ACTIVATED CARBONACEOUS SUBSTANCE FROM ABOVE THE UPPERMOST HORIZONTAL PLATE.
Claim 2
Independent Claim
288 words
A METHOD FOR THE MANUFACTURE OF AN ACTIVATED CARBON FROM A POWDERED OR GRANULAR CARBONACEOUS SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF COAL, WOOD DUST, BARK, AND COCONUT HUSK COMPRISING THE STEPS OF FEEDING THE POWDERED OR GRANULAR CARBONACEOUS SUBSTANCE ONTO THE LOWERMOST OF AT LEAST TWO HORIZONTAL PERFORATED PLATES VERTICALLY SPACED WITHIN A SUBSTANTIALLY UNIFORM DIAMETER COLUMN, SAID HORIZONTAL PERFORATED PLATES BEING SO ADAPTED THAT THE DIAMETER OF THE HOLES PIERCED THROUGH THE LOWERMOST HORIZONTAL PERFORATED PLATE IS 1 TO 2 MM AND THE HOLE RATIO THEREOF IS 0.5 TO 2.% AND THE DIAMETER OF THE HOLES PIERCED THROUGH THE SECOND AND SUBSEQUENT HORIZONTAL PERFORATED PLATES IS 2 TO 4 TIMES THE MAXIMUM DIAMETER OF THE PARTICLES OF CARBONACEOUS SUBSTANCE AND THE HOLE RATIO THEREOF IS 20 TO 30%, AND AT THE SAME TIME CAUSING A HOT ACTIVATING GAS TO ASCEND FROM BELOW SAID LOWERMOST HORIZONTAL PERFORATED PLATE, THE FLOW VELOCITY OF SAID ACTIVATING GAS BEING FROM 3 TO 10 TIMES THE MINIMUM FLOW VELOCITY REQUIRED FOR FLUIDIZING THE CARBONACEOUS SUBSTANCE, THEREBY FORMING A FLUIDIZED BED OF POWDERED OR GRANULAR CARBONACEOUS SUBSTANCE ON EACH OF SAID HORIZONTAL PERFORATED PLATES AND ALLOWING ONLY THE PORTION OF CARBONACEOUS PARTICLES WHICH HAVE HAD THEIR DIAMETER REDUCED IN CONSEQUENCE TO THE RESULTANT ACTIVATION IN ONE OF SAID FLUIDIZED BEDS TO PASS THROUGH A NEXT HIGHER HORIZONTAL PERFORATED PLATE IN CONJUNCTION WITH THE ASCENDING ACTIVATING GAS AND, AFTER THE ACTIVATING GAS ENTRAINING THE ACTIVATED CARBONACEOUS SUBSTANCE HAS REACHED THE FLUIDIZED BED FORMED ON THE UPPERMOST HORIZONTAL PERFORATED PLATE, PERMITTING THE GAS TO BE SEPARATED FROM THE ACTIVATED CARBONACEOUS SUBSTANCE AND TO DISCHARGE THROUGH THE TOPMOST PORTION OF THE COLUMN, AND SEPARATELY RECOVERING THE ACTIVATED CARBONACEOUS SUBSTANCE FROM ABOVE THE UPPERMOST HORIZONTAL PLATE.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein the activating gas is a hot mixed gas consisting of steam and the gas formed by the combustion of a hydrocarbon.
References Cited (Backward Citations)
US3565827A
Cited
US3541025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |