US2809925A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azeotropic distillation
Assignee: Phillips Petroleum Co
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Filing: 1954-12-20
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Granted: 1957-10-15
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Expires: 1974-12-20
Abstract
No abstract record available.
Inventors
- 👤 William T Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:33
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A PROCESS FOR THE SEPARATION OF NAPHTHANIC HYDROCARBONS FROM A MIXTURE OF HYDROCARBONS CONTAINING SUBSTANTIALLY ONLY NAPHTHENIC, PARAFFINIC AND ISOPARAFFINIC HYDROCARBONS, WHICH COMPRISES: SUBJECTING SAID MIXTURE TO AZEOTROPIC DISTILLATION CONDITIONS IN THE PRESENCE OF A VAPOR ENTRAINER CONSISTING ESSENTIALLY OF WATER AND A SATURATED OXYGEN CONTAINING HETEROCYCLIC ORGANIC COMPOUND HAVING FROM FIVE TO SIX MEMBERS IN THE RING, THREE TO FOUR OF SAID MEMBERS BEING OXYGEN ATOMS; AND RECOVERING NAPHTHENIC MEMBERS BEING OXYGEN ATOMS; AND RECOVERING NAPHTHENIC HYDROCARBON FROM SAID DISTILLATION.
Claim 2
Dependent Claim
81 words
A PROCESS FOR THE SEPARATION OF NAPHTHANIC HYDROCARBONS FROM A MIXTURE OF HYDROCARBONS CONTAINING SUBSTANTIALLY ONLY NAPHTHENIC, PARAFFINIC AND ISOPARAFFINIC HYDROCARBONS, WHICH COMPRISES: SUBJECTING SAID MIXTURE TO AZEOTROPIC DISTILLATION CONDITIONS IN THE PRESENCE OF A VAPOR ENTRAINER CONSISTING ESSENTIALLY OF WATER AND A SATURATED OXYGEN CONTAINING HETEROCYCLIC ORGANIC COMPOUND HAVING FROM FIVE TO SIX MEMBERS IN THE RING, THREE TO FOUR OF SAID MEMBERS BEING OXYGEN ATOMS; AND RECOVERING NAPHTHENIC MEMBERS BEING OXYGEN ATOMS; AND RECOVERING NAPHTHENIC HYDROCARBON FROM SAID DISTILLATION.
References Cited (Backward Citations)
US2397839A
Cited
US2368050A
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GB608606A
Cited
US2555650A
Cited
US2609333A
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US2690992A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-14 | 1961-04-15 | 1961-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-14 | 1965-04-15 | 1965-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-14 | 1969-04-15 | 1969-10-15 | $7700.00 | Window Closed / Lapsed |