US3038016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Isoprene separation
Assignee: Phillips Petroleum Co
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Filing: 1959-08-17
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Granted: 1962-06-05
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Expires: 1979-08-17
Abstract
No abstract record available.
Inventors
- 👤 Karl H Hachmuth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 03:30
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/12; C07C11/173; C07C11/18; C07C7/00; C07C7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN A PROCESS WHEREIN ISOPRENE IS SEPARATED FROM OTHER FIVE CARBON ATOM HYDROCARBONS BY LIQUID-LIQUID EXTRACTION IN A PAIR OF EXTRACTION COLUMNS, THE IMPROVEMENT COMPRISING PASSING A MIXTURE OF C5 HYDROCARBONS TO A FIRST EXTRACTION ZONE, CONTACTING SAID MIXTURE WITH A SOLVENT SELECTIVE TOWARD THE MORE UNSATURATED HYDROCARBONS, WITHDRAWING A SOLVENT RICH STREAM FROM SAID FIRST EXTRACTION ZONE, PASSING THE SOLVENT RICH STREAM TO A SECOND EXTRACTION ZONE AT AN INTERMEDIATE ELEVATION, INTRODUCING LEAN SOLVENT AT AN ELEVATED POSITION IN SAID SECOND EXTRACTION ZONE, INTRODUCING AN ANTISOLVENT INTO SAID SOLVENT RICH STREAM THEREBY CAUSING A PORTION OF THE C5 HYDROCARBONS TO SEPARATE, INTRODUCING ADDITIONAL MIXTURE OF C5 HYDROCABONS TO SAID SECOND EXTRACTION ZONE AT AN ELEVATION NO HIGHER THAN THE INTRODUCTION OF RICH SOLVENT AND WITHDRAWING AN ISOPRENE RICH SOLVENT FROM A LOW-ELEVATION OF SAID SECOND EXTRACTION ZONE.
Claim 2
Dependent Claim
138 words
IN A PROCESS WHEREIN ISOPRENE IS SEPARATED FROM OTHER FIVE CARBON ATOM HYDROCARBONS BY LIQUID-LIQUID EXTRACTION IN A PAIR OF EXTRACTION COLUMNS, THE IMPROVEMENT COMPRISING PASSING A MIXTURE OF C5 HYDROCARBONS TO A FIRST EXTRACTION ZONE, CONTACTING SAID MIXTURE WITH A SOLVENT SELECTIVE TOWARD THE MORE UNSATURATED HYDROCARBONS, WITHDRAWING A SOLVENT RICH STREAM FROM SAID FIRST EXTRACTION ZONE, PASSING THE SOLVENT RICH STREAM TO A SECOND EXTRACTION ZONE AT AN INTERMEDIATE ELEVATION, INTRODUCING LEAN SOLVENT AT AN ELEVATED POSITION IN SAID SECOND EXTRACTION ZONE, INTRODUCING AN ANTISOLVENT INTO SAID SOLVENT RICH STREAM THEREBY CAUSING A PORTION OF THE C5 HYDROCARBONS TO SEPARATE, INTRODUCING ADDITIONAL MIXTURE OF C5 HYDROCABONS TO SAID SECOND EXTRACTION ZONE AT AN ELEVATION NO HIGHER THAN THE INTRODUCTION OF RICH SOLVENT AND WITHDRAWING AN ISOPRENE RICH SOLVENT FROM A LOW-ELEVATION OF SAID SECOND EXTRACTION ZONE.
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) | 1965-06-04 | 1965-12-04 | 1966-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-04 | 1969-12-04 | 1970-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-04 | 1973-12-04 | 1974-06-05 | $7700.00 | Window Closed / Lapsed |