US4603119A
Expired / Lapsed
US
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Process for production of activated carbon from lignite coke
Assignee: Evonik Operations GmbH
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Filing: 1985-05-09
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Granted: 1986-07-29
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Expires: 2005-05-09
Abstract
Abstract Activated carbon is produced from lignite coke. It is characterized by the product of the molasses number times the iodine number divided by 1000 being 350 to 1000 and/or the product of the molasses number times the methylene blue number divided by 10 being 500 to 1200. It is produced by adding aqueous alkali or alkaline earth carbonate solution and/or aqueous alkali or alkaline earth hydroxide solution by means of lance during the steam activation of lignite coke in a rotating tube.
Inventors
- 👤 Alfons Karl
- 👤 Erwin Walter
- 👤 Peter Kleinschmit
- 👤 Hermann Gottschlich
- 👤 Roland Kutz
- 👤 Detlev Koth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:26
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/336
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A process of producing an activated carbon having the following properties: (1) the product of the molasses number times the iodine number divided by 1000 is 350 to 1000, (2) the product of the molasses number times the methylene blue titer divided by 10 is 500 to 1200, or (3) the product of the molasses number times the iodine number divided by 1000 is 350 to 1000 and the product of molasses number times the methylene blue titer divided by 10 is 500 to 1200, comprising activating lignite coke with steam in a rotary tube and spraying into the rotary tube during the activation phase aqueous alkali carbonate solution, aqueous alkaline earth carbonate solution, aqueous alkali hydroxide solution, aqueous alkaline earth hydroxide or mixtures thereof.
Claim 2
Dependent Claim
125 words
A process of producing an activated carbon having the following properties: (1) the product of the molasses number times the iodine number divided by 1000 is 350 to 1000, (2) the product of the molasses number times the methylene blue titer divided by 10 is 500 to 1200, or (3) the product of the molasses number times the iodine number divided by 1000 is 350 to 1000 and the product of molasses number times the methylene blue titer divided by 10 is 500 to 1200, comprising activating lignite coke with steam in a rotary tube and spraying into the rotary tube during the activation phase aqueous alkali carbonate solution, aqueous alkaline earth carbonate solution, aqueous alkali hydroxide solution, aqueous alkaline earth hydroxide or mixtures thereof.
Claim 3
Dependent Claim
19 words
A process according to claim 1 wherein the spraying is by means of a lance in the rotary tube.
Claim 4
Dependent Claim
20 words
A process according to claim 1 wherein there is used potassium carbonate or potassium hydroxide solution or a mixture thereof.
Claim 5
Dependent Claim
21 words
A process according to claim 3 wherein the potassium concentration based on the coke employed is 1.0 to 8.0 weight %.
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) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |