Patent US3849332A successfully refreshed from Google Patents.
US3849332A
Expired / Lapsed
US
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Sequential carbonization and activation of fibrous material in a carbon dioxide atmosphere
Assignee: UK Secretary of State for Defence
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Filing: 1972-02-15
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Granted: 1974-11-19
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Expires: 1992-02-15
Abstract
Abstract Highly-activated, strong, flexible, fibrous carbon is produced by upward passage of a fibrous organic starting material under critical conditions in a carbon dioxide-containing atmosphere through a vertical furnace to achieve carbonisation and subsequent activation.
Inventors
- 👤 J Williams
- 👤 A Bailey
- 👤 F Maggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:17
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/20; D01F9/21; C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/382; D01F9/16; D01F9/22; D01F9/32
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
132 words
A PROCESS FOR THE MANUFACTURE OF HIHGLY ACTIVTED FIBROUS CARBON COMPRISING PASSING A BODY OF A FIBROUS ORGANIC MATERIAL IN A CONTINOUS LENGTH UPWARDLY PASS AT LEAST ONE HEATING ELEMENT THEREBY SUBJECTING THE SAID FIBROUS MATERIAL TO A HEATING PROGRAM COMPRISING FIRSTLY A CARBONIZING STAGE TO CARBONIZE THE ORGANIC FIBROUS MATERIAL AND SUBSEQUENTLY AN ACTIVATING STAGE TO ACTIVATE THE CARBONIZED FIBROUS MATERIAL AND THROUGH OUT BOTH STAGES OF SAID HEATING PROGRAM EXPOSING THE FIBROUS MATERIAL TO AN UPWARD STREAM OF A PURGING GAS TO REMOVE VOLATILE DECOMPOSITION PRODUCTS AND ACTIVATE THE CARBONIZED FIBROUS MATERIAL, SAID PURGING GAS BEING SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE, MIXTURES OF CARBON DIOXIDE WITH AMMONIA, MIXTURES OF CARBON DIOXIDE WITH UP TO 50 PERCENT (V/V) OF AT LEAST ONE INERT GAS AND MIXTURES OF CARBON
Claim 2
Dependent Claim
132 words
A PROCESS FOR THE MANUFACTURE OF HIHGLY ACTIVTED FIBROUS CARBON COMPRISING PASSING A BODY OF A FIBROUS ORGANIC MATERIAL IN A CONTINOUS LENGTH UPWARDLY PASS AT LEAST ONE HEATING ELEMENT THEREBY SUBJECTING THE SAID FIBROUS MATERIAL TO A HEATING PROGRAM COMPRISING FIRSTLY A CARBONIZING STAGE TO CARBONIZE THE ORGANIC FIBROUS MATERIAL AND SUBSEQUENTLY AN ACTIVATING STAGE TO ACTIVATE THE CARBONIZED FIBROUS MATERIAL AND THROUGH OUT BOTH STAGES OF SAID HEATING PROGRAM EXPOSING THE FIBROUS MATERIAL TO AN UPWARD STREAM OF A PURGING GAS TO REMOVE VOLATILE DECOMPOSITION PRODUCTS AND ACTIVATE THE CARBONIZED FIBROUS MATERIAL, SAID PURGING GAS BEING SELECTED FROM THE GROUP CONSISTING OF CARBON DIOXIDE, MIXTURES OF CARBON DIOXIDE WITH AMMONIA, MIXTURES OF CARBON DIOXIDE WITH UP TO 50 PERCENT (V/V) OF AT LEAST ONE INERT GAS AND MIXTURES OF CARBON
Claim 3
Dependent Claim
51 words
A process according to claim 1 wherein the convective gas flow upwardly between said fibrous organic material and said heating element is reinforced by a supply of said purge gas gas to give a total relative gas flow rate over the surface of the material of between 50 and 250 cm/minute.
Claim 4
Dependent Claim
23 words
A process according to claim 1 wherein the inert gas is selected from the group consisting of nitrogen, argon, helium and furnace gases.
Claim 5
Dependent Claim
26 words
A process according to claim 1 wherein the purging gas is a mixture of carbon dioxide with up to 90 percent by volume of hydrogen halide.
Claim 6
Dependent Claim
21 words
A process according to claim 4 wherein the purging gas contains up to 50 percent by volume of the hydrogen halide.
Claim 7
Dependent Claim
13 words
A process according to claim 5 wherein the hydrogen halide is hydrogen chloride.
Claim 8
Dependent Claim
16 words
A process according to claim 1 wherein the fibrous organic material is a fibrous carbohydrate material.
Claim 9
Dependent Claim
16 words
A process according to claim 7 wherein the fibrous organic material is a fibrous cellulosic material.
Claim 10
Dependent Claim
16 words
A process according to claim 8 wherein the fibrous cellulosic material is a regenerated cellulosic material.
Claim 11
Dependent Claim
23 words
A process according to claim 9 wherein the regenerated cellulosic material is selected from the group consisting of viscose rayon and cuprammonium rayon.
Claim 12
Dependent Claim
28 words
A process according to claim 1, wherein the fibrous organic material is a pre-oxidised synthetic fibrous material selected from the group consisting of polyamides, polyacrylonitrile and polyvinyl alcohol.
Claim 13
Dependent Claim
46 words
A process according to claim 7 wherein between about 0.1 and 10 percent by weight of at least one impregnant selected from the group consisting of halides of zinc, aluminium, barium, calcium, magnesium and iron, is incorporated into the fibrous carbohydrate material before it is carbonised.
Claim 14
Dependent Claim
12 words
A process according to claim 12 wherein the impregnant is a chloride.
Claim 15
Dependent Claim
36 words
A process according to claim 12 wherein the impregnant is incorporated into the fibrous carbohydrate material by immersing the fibrous carbohydrate material in an aqueous solution containing 1 to 30 percent by weight of the impregnant.
Claim 16
Dependent Claim
20 words
A process according to claim 1 wherein the fibrous organic material is in the form of woven or non-woven cloth.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |