Patent US3668078A successfully refreshed from Google Patents.
US3668078A
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Fractional distillation bypass control process
Assignee: Phillips Petroleum Co
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Filing: 1969-04-25
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Granted: 1972-06-06
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Expires: 1989-04-25
Abstract
Abstract The composition of the overhead or bottoms product of a distillation is analyzed and a portion of the feed is passed directly to a recovery step when an analyzer output indicates a predetermined composition of the overhead or bottoms product.
Inventors
- 👤 Eric O Holland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 00:48
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/425; Y; Y10; Y10S; Y10S203/00; Y10S203/19; Y10T; Y10T137/00; Y10T137/7287
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
99 words
A process in accordance with claim 1 further comprising returning to said fractional distillation zone all of said other of said overhead or said bottoms stream having the higher concentration of said impurity when the flow rate of said second portion of said feed stream to said fractional distillation zone is reduced below a predetermined minimum value, and reducing the flow rate of said one of said overhead or said bottoms stream having the lower concentration of said impurity in a manner responsive to a reduction in the flow rate of said second portion to said fractional distillation zone.
Claim 2
Dependent Claim
83 words
A process in accordance with claim 1 further comprising overriding the control of said flow rate of said first portion of said feed stream responsive to said first signal when said liquid level in said surge zone falls below a predetermined minimum desirable value, and during such overriding action controlling the rate of flow of said first portion of said feed stream responsive to the difference between said predetermined minimum desirable value and the actual value of liquid level in said surge zone.
Claim 3
Dependent Claim
96 words
A process in accordance with claim 1 wherein said overhead stream contains a higher concentration of said impurity than said feed stream, and said bottoms stream contains a lower concentration of said impurity than said feed stream, and wherein the flow rate of said first portion of said feed stream is increased in intermittent stepwise fashion when the concentration of said impurity in said product stream is below said predetermined value therefor and is decreased in intermittent stepwise fashion when the concentration of said impurity in said product stream is greater than said predetermined value therefor.
Claim 4
Dependent Claim
96 words
A process in accordance with claim 1 wherein said overhead stream contains a lower concentration of said impurity than said feed stream, and said bottoms stream contains a higher concentration of said impurity than said feed stream, and wherein the flow rate of said first portion of said feed stream is increased in intermittent stepwise fashion when the concentration of said impurity in said product stream Is below said predetermined value therefor and is decreased in intermittent stepwise fashion when the concentration of said impurity in said product stream is greater than said predetermined value therefor.
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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) | 1975-06-06 | 1975-12-06 | 1976-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-06 | 1979-12-06 | 1980-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-06 | 1983-12-06 | 1984-06-06 | $7700.00 | Window Closed / Lapsed |