US4435378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing extractable substances from carbon black
Assignee: Evonik Operations GmbH
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Filing: 1982-05-07
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Granted: 1984-03-06
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Expires: 2002-05-07
Abstract
Abstract A process for removing extractables from carbon blacks in a fluidized bed, wherein low extractable carbon blacks are treated under relatively mild temperature conditions (320° C.) with an oxygen containing gas and high extractable carbon blacks are treated first at 100°-320° C. with steam and then at 200°-500° C. with an oxygen containing gas. A definition of classification in the "low extractable" and "high extractable" categories is given.
Inventors
- 👤 Reinhold Reck
- 👤 Gerhard Kuhner
- 👤 Manfred Voll
- 👤 Peter Kleinschmit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:52
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/44; C09C1/48; C09C1/56; C09C1/565; C01; C01P; C01P2006/00; C01P2006/10; C01P2006/22
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
54 words
A process for removing toluene extractable substances from powdery carbon blacks by treatment with a stream of gas at an elevated temperature comprising treating powdery carbon black containing 0.15 to 1.5% by weight of toluene extractable substances with an oxygen containing gas in a fluidized bed at a temperature from 200° to 320° C.
Claim 2
Dependent Claim
54 words
A process for removing toluene extractable substances from powdery carbon blacks by treatment with a stream of gas at an elevated temperature comprising treating powdery carbon black containing 0.15 to 1.5% by weight of toluene extractable substances with an oxygen containing gas in a fluidized bed at a temperature from 200° to 320° C.
Claim 3
Dependent Claim
17 words
The process according to claim 1, wherein carbon black and the gas stream travel cocurrent or countercurrent.
Claim 4
Dependent Claim
13 words
The process according to claim 1, wherein the oxygen containing gas is air.
Claim 5
Dependent Claim
74 words
A process for removing toluene extractable substances from powdery carbon blacks by treatment with a stream of gas at an elevated temperature, comprising treating powdery carbon black containing toluene extractable substances in excess of 1.5% by weight or more in a fluidized bed in a first stage with steam at temperatures of 100° to 320° C. and then, in a second stage, with an oxygen containing gas at temperatures of 200° to 500° C.
Claim 6
Dependent Claim
74 words
A process for removing toluene extractable substances from powdery carbon blacks by treatment with a stream of gas at an elevated temperature, comprising treating powdery carbon black containing toluene extractable substances in excess of 1.5% by weight or more in a fluidized bed in a first stage with steam at temperatures of 100° to 320° C. and then, in a second stage, with an oxygen containing gas at temperatures of 200° to 500° C.
Claim 7
Dependent Claim
16 words
The process according to claim 4, wherein carbon black and gas stream travel cocurrent or countercurrent.
Claim 8
Dependent Claim
13 words
The process according to claim 4, wherein the oxygen containing gas is air.
Claim 9
Dependent Claim
31 words
The process according to claim 4, wherein the carbon black is treated in the first stage at 100° to 250° C. and in the second stage, at 250° to 450° C.
References Cited (Backward Citations)
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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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |