Patent US3284348A successfully refreshed from Google Patents.
US3284348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropic distillation of hydrocarbons with hexafluoroisopropyl alcohol
Assignee: EIDP Inc
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Filing: 1965-03-15
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Granted: 1966-11-08
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Expires: 1985-03-15
Abstract
No abstract record available.
Inventors
- 👤 Hutton David Glenn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:05
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
140 words
THE PROCESS FOR SEPARATING NON-AROMATIC HYDROCARBONS FROM A MIXTURE THEREOF WITH AROMATIC HYDROCARBONS, WHICH PROCESS COMPRISES (A) DISTALLING IN A DISTILLATION COLUMN AT A HEAD TEMPERATURE OF UP TO ABOUT 60*C., (B( A MIXTURE OF HYDROCARBONS WHICH CONSISTS ESSENTIALLY OF NON-AROMATIC HYDROCARBONS NORMALLY BOILING BETWEEN 60*C. AND 150*C. AND AROMATIC HYDROCARBONS NORMALLY BOILING BETWEEN 80*C. AND 150*C., (C) WITH HEXAFLURORISPROPYL ALCOHOL IN A PROPORTION OF FROM ABOUT 1 TO ABOUT 100 PARTS BY WEIGHT FOR EACH PART OF THE NON-AROMATIC HYDROCARBONS TO BE SEPARATED FROM THE MIXTURE, (D) TAKING OFF AT LEAST ONE OVERHEAD FRACTION CONSISTING ESSENTIALLY OF A LOW-BOILING AZEOTROPE OF HEXAFLUOROISOPROPYL ALCOHOL AND AT LEAST ONE OF SAID NON-AROMATIC HYDROCARBONS AND LEAVING A STILL RESIDUE CONTAINING MOST OF SAID AROMATIC HYDROCARBONS, (E) AND SEPARATING FROM BOTH THE OVERHEAD FRACTION AND THE STILL RESIDUE THE HEXAFLUOROISOPROPYL ALCOHOL CONTAINED THEREIN.
Claim 2
Dependent Claim
140 words
THE PROCESS FOR SEPARATING NON-AROMATIC HYDROCARBONS FROM A MIXTURE THEREOF WITH AROMATIC HYDROCARBONS, WHICH PROCESS COMPRISES (A) DISTALLING IN A DISTILLATION COLUMN AT A HEAD TEMPERATURE OF UP TO ABOUT 60*C., (B( A MIXTURE OF HYDROCARBONS WHICH CONSISTS ESSENTIALLY OF NON-AROMATIC HYDROCARBONS NORMALLY BOILING BETWEEN 60*C. AND 150*C. AND AROMATIC HYDROCARBONS NORMALLY BOILING BETWEEN 80*C. AND 150*C., (C) WITH HEXAFLURORISPROPYL ALCOHOL IN A PROPORTION OF FROM ABOUT 1 TO ABOUT 100 PARTS BY WEIGHT FOR EACH PART OF THE NON-AROMATIC HYDROCARBONS TO BE SEPARATED FROM THE MIXTURE, (D) TAKING OFF AT LEAST ONE OVERHEAD FRACTION CONSISTING ESSENTIALLY OF A LOW-BOILING AZEOTROPE OF HEXAFLUOROISOPROPYL ALCOHOL AND AT LEAST ONE OF SAID NON-AROMATIC HYDROCARBONS AND LEAVING A STILL RESIDUE CONTAINING MOST OF SAID AROMATIC HYDROCARBONS, (E) AND SEPARATING FROM BOTH THE OVERHEAD FRACTION AND THE STILL RESIDUE THE HEXAFLUOROISOPROPYL ALCOHOL CONTAINED THEREIN.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |