US3660247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for controlling with a computer a distillation column product and heat fluid rates of flow
Assignee: EIDP Inc
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Filing: 1970-07-31
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Granted: 1972-05-02
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Expires: 1990-07-31
Abstract
Abstract A process and apparatus for controlling a distillation column, especially useful for purifying tolylene diisocyanate. The process comprises (a) selectively proportioning both the reboiler steam flow rate and the column bottoms take-off rate to the distillation column feed rate and (b) adjusting the distillate take-off rate in accordance with variations in the distillation column feed rate and deviations in the level of the column bottoms.
Inventors
- 👤 Roger G E Franks
- 👤 Steven L Ritchey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:29
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/425; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
20 words
The control process of claim 1 in which the liquid being fed to the distillation column is impure tolylene diisocyanate.
Claim 2
Dependent Claim
136 words
The process of claim 2 in which (A) the proportion of the bottoms take-off rate to the distillation column feed rate is in accordance with the equation: B xF where B the bottoms take-off rate, x 0.04, F feed rate to the distillation column; (B) the proportion of the steam flow to the distillation column feed is in accordance with the equation: S yF + C1, where S steam flow rate, y 0.194, F feed rate to the distillation column, and C1 1180; (C) the proportion of the distillate take-off rate to the distillation column feed rate is in accordance with the equation: D zF + C2( Delta L)F where D distillation take-off rate, z 0.96, F feed rate to the distillation column, ( Delta L) percent deviation of the bottoms liquid level, and C2 0.000379.
Claim 3
Independent Claim
552 words
An apparatus for controlling a distillation column having a means to feed an impure liquid material to the column, bottoms take-off, distillate take-off, a steam heated reboiler to supply heat to the distillation column, and a condenser to condense the distillate consisting essentially of: A. means for measuring and transmitting to an analog computer a signal representative of the rate at which said liquid material is being fed to said distillation column, B. means for measuring the level of the liquid existing in the bottoms of the distillation column and transmitting a signal representative of the bottoms liquid level to a controller which compares the signal of the actual liquid level to a predetermined desired level and in turn transmits a signal representative of the deviation of the actual bottoms liquid level from the desired level to the analog computer, C. means for receiving the signals representing the distillation column feed rate and the deviation of the actual bottoms liquid level from the desired level by the analog computer, automatically proportioning (1) the desired bottoms take-off rate to the distillation column feed rate by the equation B xF where B the desired bottoms take-off, X a predetermined function and F the distillation column feed rate, (2) the desired steam flow rate to the distillation column feed rate by the equation S yF + C1, where S the desired steam flow rate, y a predetermined function, F distillation column feed rate and C1 is a predetermined constant, and (3) the desired distillate take-off rate to the distillation column feed rate and the deviation of actual bottoms liquid level from the desired level, by the equation D zF + C2 F( Delta L), where D the desired rate of distillate take-off, z a predetermined function, F disTillation column feed rate, C2 is a predetermined constant and Delta L percent deviation in bottoms liquid level, and transmitting a signal representing the desired bottoms take-off rate, the desired steam flow rate, and the desired distillate take-off rate, D. means for measuring and transmitting a signal representative of the actual bottoms take-off rate, E. means for controlling the bottoms take-off rate by accepting the signal from the computer representative of the desired bottoms take-off rate and the signal representing the actual bottoms take-off rate and transmitting a signal representative of any deviation to adjust the actual bottoms take-off rate until it conforms to that desired, F. means for measuring and transmitting a signal representative of the actual steam flow rate, G. means for controlling the steam flow rate by accepting the signal representing the actual steam flow rate, and the signal from the computer representing the desired steam flow rate, comparing the signal of the actual steam flow to the signal of that desired, transmitting a signal representative of any deviation to adjust the actual steam flow rate until it conforms to that desired, H. means for measuring and transmitting a signal representative of the actual distillate take-off rate, and I. means for controlling the distillate take-off rate by accepting the signal representing the actual distillate take-off rate, and the signal from the computer representing the desired distillate take-off rate, comparing the actual to the desired signal, transmitting a signal representative of any deviation to adjust the actual distillate flow rate until it conforms with that desired.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |