Patent US2618664A successfully refreshed from Google Patents.
US2618664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for isolating phenolic compounds from mixtures thereof
Assignee: Texaco Inc
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Filing: 1950-07-29
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Granted: 1952-11-18
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Expires: 1970-07-29
Abstract
No abstract record available.
Inventors
- 👤 Howard V Hess
- 👤 George B Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:41
CPC Classifications
C; C07; C07C; C07C37/00; C07C37/68; C07C37/86
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR SEPARATING LOW MOLECULAR WEIGHT PHENOLIC COMPONDS OF THE GROUP CONSISTING OF PHENOL, CRESOLS, ETHYLPHENOLS AND XYLENOLS FROM A PHENOLIC COMPOUND-CONTAINING MIXTURE, WHICH COMPRISES CONTACTING SAID MIXTURE WITH AQUEOUS HEXAMETHYLENE TETRAMINE AT A TEMPERATURE BELOW 180* F. WHEREBY THERE ARE FORMED COMPLEXES OF SAID HEXAMETHYLENE TETRAMINE AND SAID LOW MOLECULAR WEIGHT PHENOLIC COMPOUNDS, SEPARATING A LIQUID COMPLEX PHASE FROM SAID MIXTURE IN THE PRESENCE OF AN ANTI-SOLVENT SELECTED FROM THE GROUP CONSISTING OF PARAFFINIC AND NAPHTHENIC HYDROCARBONS AND MIXTURES THEREOF, DECOMPOSING SAID SEPARATED COMPLEX PHASE BY CONTACT WITH AN OXYGENATED HYDROCARBON SOLVENT HAVING A HIGH SOLVENT POWER FOR TAR ACIDS AND A LOW SOLVENT POWER FOR HEXAMETHYLENE TETRAMINE AND WATER AT A TEMPERATURE BELOW 180* F. WHEREBY SAID LOW MOLECULAR WEIGHT PHENOLS ARE LIBERATED FROM SAID COMPLEX.
Claim 2
Dependent Claim
129 words
A PROCESS FOR SEPARATING LOW MOLECULAR WEIGHT PHENOLIC COMPONDS OF THE GROUP CONSISTING OF PHENOL, CRESOLS, ETHYLPHENOLS AND XYLENOLS FROM A PHENOLIC COMPOUND-CONTAINING MIXTURE, WHICH COMPRISES CONTACTING SAID MIXTURE WITH AQUEOUS HEXAMETHYLENE TETRAMINE AT A TEMPERATURE BELOW 180* F. WHEREBY THERE ARE FORMED COMPLEXES OF SAID HEXAMETHYLENE TETRAMINE AND SAID LOW MOLECULAR WEIGHT PHENOLIC COMPOUNDS, SEPARATING A LIQUID COMPLEX PHASE FROM SAID MIXTURE IN THE PRESENCE OF AN ANTI-SOLVENT SELECTED FROM THE GROUP CONSISTING OF PARAFFINIC AND NAPHTHENIC HYDROCARBONS AND MIXTURES THEREOF, DECOMPOSING SAID SEPARATED COMPLEX PHASE BY CONTACT WITH AN OXYGENATED HYDROCARBON SOLVENT HAVING A HIGH SOLVENT POWER FOR TAR ACIDS AND A LOW SOLVENT POWER FOR HEXAMETHYLENE TETRAMINE AND WATER AT A TEMPERATURE BELOW 180* F. WHEREBY SAID LOW MOLECULAR WEIGHT PHENOLS ARE LIBERATED FROM SAID COMPLEX.
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) | 1955-11-18 | 1956-05-19 | 1956-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-18 | 1960-05-19 | 1960-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-18 | 1964-05-19 | 1964-11-18 | $7700.00 | Window Closed / Lapsed |