US4026795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the regeneration of activated carbon
Assignee: Asahi Kasei Corp
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Filing: 1975-11-06
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Granted: 1977-05-31
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Expires: 1995-11-06
Abstract
Abstract Method for the regeneration of an activated carbon having adsorbates adsorbed therein characterized by removing the adsorbates by liquid dimethyl ether or a mixture of liquid dimethyl ether and water. By such method, the spent carbon can be effectively regenerated without degrading the absorption capacity and mechanical strength thereof. Further, valuable substances in the desorbed adsorbates can be effectively concentrated and recovered by a simple additional operation.
Inventors
- 👤 Hiroshige Okamoto
- 👤 Shiro Watanabe
- 👤 Katsumi Yuasa
- 👤 Mitsuo Takano
- 👤 Itaru Fukinbara
- 👤 Nobumitsu Yano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:19
CPC Classifications
C; C01; C01B; C01B32/00; C01B32/30; C01B32/354; C01B32/36
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
A method for the regeneration of activated carbon which comprises contacting an activated carbon having pollutants adsorbed therein with liquid dimethyl ether to desorb and separate the adsorbates from said activated carbon.
Claim 2
Independent Claim
32 words
A method for the regeneration of activated carbon which comprises contacting an activated carbon having pollutants adsorbed therein with liquid dimethyl ether to desorb and separate the adsorbates from said activated carbon.
Claim 3
Dependent Claim
15 words
A method according to claim 1 wherein the liquid dimethyl ether is used with water.
Claim 4
Dependent Claim
27 words
A method according to claim 1 wherein said liquid dimethyl ether is employed in an amount of 0.5 to 50 g. per g. of the activated carbon.
Claim 5
Dependent Claim
36 words
A method according to claim 2 wherein the liquid dimethyl ether is employed with water in a ratio (dimethyl ether to water of 0.5- 50 g. to 0.1- 25 g. per g. of the activated carbon.
Claim 6
Dependent Claim
18 words
A method according to claim 4 wherein the amount of water exceeds saturation solubility to liquid dimethyl ether.
Claim 7
Dependent Claim
15 words
A method according to claim 1 wherein the contacting is effected for 5- 60 minutes.
Claim 8
Dependent Claim
27 words
A method according to claim 1 wherein the dimethyl ether is subsequently removed by evaporation from the desorption liquid to recover valuable substances contained in the adsorbates.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |