US4118341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Activated carbon
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1977-04-05
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Granted: 1978-10-03
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Expires: 1997-04-05
Abstract
Abstract A method for the manufacture of an activated carbon by subjecting an acrylonitrile polymer to thermal condensation and activating the resultant condensation product and an activated carbon manufactured by said method. The activated carbon obtained is characterized by containing nitrogen in the molecular structure thereof and by having a high adsorbing capacity for mercaptan.
Inventors
- 👤 Katsuji Ishibashi
- 👤 Shigeo Mitsui
- 👤 Rikio Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:31
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/312; C01B32/318
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
99 words
A method of manufacturing activated carbon which comprises: (a) thermally condensing a polymer of acrylonitrile at a temperature between 150° and 500° C. for 3 hours to 2 minutes in an oxidizing atmosphere until a black condensation product is formed; (b) heating said product at 550° to 950° C. in an atmosphere consisting essentially of at least one member of the group consisting of steam and carbon dioxide until an activated carbon capable of absorbing butyl mercaptan in an amount of more than 100% of the weight of said activated carbon is formed; and (c) recovering said activated carbon.
Claim 2
Independent Claim
99 words
A method of manufacturing activated carbon which comprises: (a) thermally condensing a polymer of acrylonitrile at a temperature between 150° and 500° C. for 3 hours to 2 minutes in an oxidizing atmosphere until a black condensation product is formed; (b) heating said product at 550° to 950° C. in an atmosphere consisting essentially of at least one member of the group consisting of steam and carbon dioxide until an activated carbon capable of absorbing butyl mercaptan in an amount of more than 100% of the weight of said activated carbon is formed; and (c) recovering said activated carbon.
Claim 3
Dependent Claim
27 words
A method as set forth in claim 1, wherein said activated carbon contains 0.2 to 20% nitrogen, 0.5 to 10% hydrogen, the balance consisting essentially of carbon.
Claim 4
Dependent Claim
27 words
A method as set forth in claim 2, wherein said polymer is polyacrylonitrile, said activated carbon containing at least 0.5% nitrogen, and not more than 5% hydrogen.
Claim 5
Dependent Claim
67 words
A method as set forth in claim 2, wherein said polymer is a copolymer of at least 10% acrylonitrile with at least one member of the group consisting of acrylic acid, acrylic ester, methacrylic acid, methacrylic ester, acrylamide, methacrylamide, vinyl acetate, vinyl alcohol, vinyl chloride, vinylidene chloride, vinyl pyridine, vinyl pyrrolidone, hydroxyalkyl acrylate, hydroxyalkyl methacrylate, glycidyl acrylate, glycidyl methacrylate, butadiene, butadienestyrene copolymer and cyanoethylation product of cellulose.
Claim 6
Dependent Claim
76 words
An activated carbon containing 0.2 to 20% nitrogen, 0.5 to 10% hydrogen, the balance consisting essentially of carbon, said activated carbon being capable of absorbing butyl mercaptan in an amount of more than 100% of the weight thereof, having a specific surface area of 300 to 2500 m 2 /g, a methylene blue decolorization index of 10 to 800 mg/g, an iodine value of 300 to 2800 mg/g, and a bulk density of 0.02 to 0.39.
Claim 7
Dependent Claim
76 words
An activated carbon containing 0.2 to 20% nitrogen, 0.5 to 10% hydrogen, the balance consisting essentially of carbon, said activated carbon being capable of absorbing butyl mercaptan in an amount of more than 100% of the weight thereof, having a specific surface area of 300 to 2500 m 2 /g, a methylene blue decolorization index of 10 to 800 mg/g, an iodine value of 300 to 2800 mg/g, and a bulk density of 0.02 to 0.39.
Claim 8
Dependent Claim
70 words
An activated carbon as set forth in claim 5 produced by thermally condensing a polymer of acrylonitrile at a temperature between 150° and 500° C. for 3 hours to 2 minutes in an oxidizing atmosphere until a black condensation product is formed, and by heating said product at 550° to 950° in an atmosphere consisting essentially of at least one member of the group consisting of steam and carbon dioxide.
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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) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |