US3886093A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activated carbon with active metal sites and process for producing same
Assignee: Westvaco Corp
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Filing: 1973-12-14
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Granted: 1975-05-27
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Expires: 1993-12-14
Abstract
Abstract Activated carbons having uniformly distributed active metal sites are described. A process for making the carbons of this invention comprises, precipitating a lignin solution with various transition metal salts to form a metal lignate slurry, drying the precipitated metal lignate, carbonizing and activating the metal lignate to produce activated carbon with active metal sites. The activated carbons with active metal sites produced according to this process are particularly characterized by having the metal sites uniformly distributed throughout the carbon particle and are useful for catalytic and sorption applications.
Inventors
- 👤 Mitchell S Dimitri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:42
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/08; B01J37/082; B01J37/084; C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; C01B32/348
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
91 words
A PROCESS FOR PRODUCING ACTIVATED CARBON CONTAINING ACTIVE METAL SITES WHICH COMPRISES: A. MIXING A NON-SULFONATED AQUEOUS LIGNATE SOLUTION WITH AN AQUEOUS SOLUTION CONTAINING A TRANSITION METAL SALT AT A MOL RATIO OF 2:1 TO 1:1 METAL SALT TO LIGNATE TO THEREBY PRECIPITATE A TRANSITION METAL LIGNATE; B. RECOVERING SAID TRANSITION METAL LIGNATE PRECIPITATE; C. DRYING SAID RECOVERED TRANSITION METAL LIGNATE PRECIPITATE; D. CARBONIZING SAID TRANSITION METAL LIGNATE PRECIPITATE AT A TEMPERATURE BETWEEN 700*F. AND 1,800*F.; AND E. ACTIVATING SAID CARBONIZED TRANSITION METAL LIGNATE AT A TEMPERATURE BETWEEN 1,400*F. AND 1,950*F.
Claim 2
Dependent Claim
91 words
A PROCESS FOR PRODUCING ACTIVATED CARBON CONTAINING ACTIVE METAL SITES WHICH COMPRISES: A. MIXING A NON-SULFONATED AQUEOUS LIGNATE SOLUTION WITH AN AQUEOUS SOLUTION CONTAINING A TRANSITION METAL SALT AT A MOL RATIO OF 2:1 TO 1:1 METAL SALT TO LIGNATE TO THEREBY PRECIPITATE A TRANSITION METAL LIGNATE; B. RECOVERING SAID TRANSITION METAL LIGNATE PRECIPITATE; C. DRYING SAID RECOVERED TRANSITION METAL LIGNATE PRECIPITATE; D. CARBONIZING SAID TRANSITION METAL LIGNATE PRECIPITATE AT A TEMPERATURE BETWEEN 700*F. AND 1,800*F.; AND E. ACTIVATING SAID CARBONIZED TRANSITION METAL LIGNATE AT A TEMPERATURE BETWEEN 1,400*F. AND 1,950*F.
Claim 3
Dependent Claim
11 words
THE PROCESS OF CLAIM 1 WHEREIN SAID LIGNIN IS ALKALI LIGNIN.
Claim 4
Dependent Claim
14 words
THE PROCESS OF CLAIM 1 WHEREIN SAID LIGNIN IS A HEXAMETHYLENE TETRAMINE MODIFIED LIGNIN.
Claim 5
Dependent Claim
24 words
The process of claim 1 wherein said transitional metal is a member of the group consiting essentially of cobalt, aluMinum, nickel, copper and iron.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein said metal lignate is recovered by filtering.
Claim 7
Dependent Claim
20 words
The process of claim 5 wherein said recovered lignin is washed prior to drying to remove any excess metals salt.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein the metal lignate is dried and carbonized co-currently.
Claim 9
Dependent Claim
15 words
The process of claim 1 wherein the dry metal lignate is carbonized and activated co-currently.
Claim 10
Dependent Claim
16 words
The activated carbon product having active metal sites made by the process according to claim 1.
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) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |