Cascaded multistage distillation design and operation
Abstract
Abstract AN IMPROVED MANNER OF OPERATING CASCADED MULTISTAGE DISTILLATION, FOR EXAMPLE, IN CRUDE OIL DISTILLATION, BY OPERATING THE FLASH OF ONE FRACTIONATOR OT OBTAIN A RELATIVELY HIGH CUT POINT, CHARGING THE BOTTOMS OF SAID UNIT TO THE NEXT FRACTIONATOR, RECOVERING A RELATIVELY HEAVY FRACTION AT AN INTERMEDIATE POINT OF THE FIRST OF SAID FRACTIONATORS, AND CHARGING THE SAID HEAVY FRACTION AT CONDITIONS NOT ABOVE ITS BUBBLE POINT TO AN INTERMEDIATE POINT ON SAID NEXT FRACTIONATOR, SAID INTERMEDIATE POINT ON SAID NEXT FRACTIONATOR BEING WHERE THE LIQUID DISTILLATE COMPOSITION IN THE FRACTIONATOR CLOSELY APPROXIMATES THE COMPOSITION OF THE CHARGE STREAM FROM SAID FIRST OF SAID FRACTIONATORS.
Inventors
- 👤 Hugh L Myers
Bibliographic Details
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |