Patent US4421607A successfully refreshed from Google Patents.
US4421607A
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US
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Process for extractive distillation of plural hydrocarbon mixtures
Assignee: Zeon Corp
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Filing: 1983-02-01
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Granted: 1983-12-20
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Expires: 2003-02-01
Abstract
Abstract A process of extractive distillation for separating components easily soluble in a polar solvent from at least two hydrocarbon mixtures having different contents of the easily soluble components by extractive distillation using said polar solvent, which comprises feeding a hydrocarbon mixture containing a larger amount of the easily soluble components, as a gas, into the middle or lower portion of an extractive distillation column, feeding a hydrocarbon mixture containing a smaller amount of the easily soluble components, as a liquid, to the upper portion of the extractive distillation column, and subjecting them to extractive distillation.
Inventors
- 👤 Shunichiro Ogura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:06
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08; B; B01; B01D; B01D3/00; B01D3/34; B01D3/40; Y; Y10; Y10S; Y10S203/00; Y10S203/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
95 words
A process of extractive distillation for separating components easily soluble in a polar solvent from at least two hydrocarbon mixtures having different contents of the easily soluble components by extractive distillation using said polar solvent, which comprises feeding a hydrocarbon mixture containing a larger amount of the easily soluble components, as a gas, into the middle or lower portion of an extractive distillation column, feeding a hydrocarbon mixture containing a smaller amount of the easily soluble components, as a liquid, to the upper portion of the extractive distillation column, and subjecting them to extractive distillation.
Claim 2
Dependent Claim
95 words
A process of extractive distillation for separating components easily soluble in a polar solvent from at least two hydrocarbon mixtures having different contents of the easily soluble components by extractive distillation using said polar solvent, which comprises feeding a hydrocarbon mixture containing a larger amount of the easily soluble components, as a gas, into the middle or lower portion of an extractive distillation column, feeding a hydrocarbon mixture containing a smaller amount of the easily soluble components, as a liquid, to the upper portion of the extractive distillation column, and subjecting them to extractive distillation.
Claim 3
Dependent Claim
38 words
The process of claim 1 wherein olefinic hydrocarbons are separated from at least two hydrocarbon mixtures containing paraffinic hydrocarbons and olefinic hydrocarbons and having different contents of the olefinic hydrocarbons which are easily soluble in the polar solvent.
Claim 4
Dependent Claim
11 words
The process of claim 2 wherein the polar solvent is dimethylformamide.
Claim 5
Dependent Claim
40 words
The process of claim 1 wherein diolefinic hydrocarbons are separated from at least two hydrocarbon mixtures containing paraffinic hydrocarbons, olefinic hydrocarbons and diolefinic hydrocarbons and having different contents of the diolefinic hydrocarbons which are easily soluble in the polar solvent.
Claim 6
Dependent Claim
11 words
The process of claim 4 wherein the polar solvent is dimethylformamide.
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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) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |