Patent US4082694A successfully refreshed from Google Patents.
US4082694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Active carbon process and composition
Assignee: BP Corp North America Inc
•
Filing: 1976-06-16
•
Granted: 1978-04-04
•
Expires: 1996-06-16
Abstract
Abstract An improved process is disclosed whereby coal, coke or a combination thereof can be converted in good yield to a very high surface area active carbon with a unique and useful combination of properties, which carbons are particularly useful for water purification. Novel active carbons having a very high surface area which substantially have a cage-like structure exhibiting microporosity are disclosed.
Inventors
- 👤 Arnold N. Wennerberg
- 👤 Thomas M. O'Grady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:47
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/342; Y; Y10; Y10T; Y10T428/00; Y10T428/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
106 words
A process consisting essentially of: a. substantially dehydrating an agitated combination of solid potassium hydroxide containing between about 2 and about 25 weight percent water and a carbonaceous material comprising coal coke, petroleum coke or a mixture thereof by heating said combination in a weight ratio said hydroxide to said substance between about 1/2 to 1 and 5 to 1 below about 900° F.; b. activating the product of (a) by heating between about 1,300° F. and about 1,800° F.; and c. cooling the product of (b) and removing essentially all the inorganic material therefrom by water washing to form a high surface area active carbon.
Claim 2
Dependent Claim
106 words
A process consisting essentially of: a. substantially dehydrating an agitated combination of solid potassium hydroxide containing between about 2 and about 25 weight percent water and a carbonaceous material comprising coal coke, petroleum coke or a mixture thereof by heating said combination in a weight ratio said hydroxide to said substance between about 1/2 to 1 and 5 to 1 below about 900° F.; b. activating the product of (a) by heating between about 1,300° F. and about 1,800° F.; and c. cooling the product of (b) and removing essentially all the inorganic material therefrom by water washing to form a high surface area active carbon.
Claim 3
Dependent Claim
12 words
The process of claim 1 wherein said carbonaceous material is coal coke.
Claim 4
Dependent Claim
12 words
The process of claim 1 wherein said carbonaceous material is petroleum coke.
Claim 5
Dependent Claim
60 words
Active carbon derived from a carbonaceous material comprising coal coke, petroleum coke or mixture thereof having a cage-like structure exhibiting microporosity which contributes to over 60 percent of its surface and which has an effective BET surface area of greater than about 2,300 square meters per gram and a bulk density greater than about twenty-five hundredths grams per cubic centimeter.
Claim 6
Dependent Claim
60 words
Active carbon derived from a carbonaceous material comprising coal coke, petroleum coke or mixture thereof having a cage-like structure exhibiting microporosity which contributes to over 60 percent of its surface and which has an effective BET surface area of greater than about 2,300 square meters per gram and a bulk density greater than about twenty-five hundredths grams per cubic centimeter.
Claim 7
Dependent Claim
60 words
Active carbon derived from a carbonaceous material comprising coal coke, petroleum coke or mixtures thereof having a cage-like structure exhibiting microporosity which contributes to over 80 percent of its surface and which has an effective BET surface area of greater than about 2,700 square meters per gram and a bulk density greater than about twenty-five hundredths grams per cubic centimeter.
Claim 8
Dependent Claim
60 words
Active carbon derived from a carbonaceous material comprising coal coke, petroleum coke or mixtures thereof having a cage-like structure exhibiting microporosity which contributes to over 80 percent of its surface and which has an effective BET surface area of greater than about 2,700 square meters per gram and a bulk density greater than about twenty-five hundredths grams per cubic centimeter.
Claim 9
Dependent Claim
61 words
Active carbon derived from a carbonaceous material comprising coal coke, petroleum coke or mixtures thereof having a cage-like structure exhibiting microporosity which contributes to over 90 percent of its surface and which has an effective BET surface area of greater than about 3,000 square meters per gram and a bulk density of greater than about twenty-five hundredths grams per cubic centimeter.
Claim 10
Dependent Claim
61 words
Active carbon derived from a carbonaceous material comprising coal coke, petroleum coke or mixtures thereof having a cage-like structure exhibiting microporosity which contributes to over 90 percent of its surface and which has an effective BET surface area of greater than about 3,000 square meters per gram and a bulk density of greater than about twenty-five hundredths grams per cubic centimeter.
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) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |