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US3676304A
Expired / Lapsed
US
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Control of fractionation column reboiler
Assignee: Phillips Petroleum Co
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Filing: 1970-07-08
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Granted: 1972-07-11
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Expires: 1990-07-08
Abstract
Abstract The flow of heat exchange fluid through the reboiler of a fractionation column is controlled in response to a computation of the heat actually supplied by the fluid. The set point of the flow controller is established from a measurement of the separation made by the column or the liquid level in the lower region of the column.
Inventors
- 👤 James W Hobbs
- 👤 George W Long
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:48
CPC Classifications
F; F25; F25J; F25J3/00; F25J3/02; F25J3/0204; F25J3/0219; B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/4238; C; C07; C07C; C07C7/00; C07C7/04; F25J3/0228; F25J3/0238; F25J2210/00; F25J2210/12; F25J2215/00; F25J2215/62; F25J2280/00; F25J2280/02; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
440 words
A control system to regulate the heat supplied to a reboiler of a fractionation column which is employed to separate a fluid mixture, by a heating fluid circulated through a reboiler of the column, said Heating fluid being introduced into said reboiler as a compressed gas, said system comprising: means to measure the temperature of the compressed gas introduced into the reboiler and establish a first signal representative thereof; means to measure the temperature of the heating fluid withdrawn from the reboiler and establish a second signal representative thereof; means to introduce the compressed gas into the reboiler through an orifice meter and establish a third signal representative of the differential pressure across the orifice meter; means to measure the pressure of the compressed gas introduced into the reboiler and establish a fourth signal representative thereof; means to multiply said third signal by said fourth signal and establish a fifth signal representative of the product; means to divide said fifth signal by said first signal and establish a sixth signal representative of the quotient; means responsive to said sixth signal to establish a seventh signal representative of the square root of said sixth signal; means to multiply said seventh signal by an eighth signal representative of the orifice constant of the orifice meter and establish a ninth signal representative of the product; means to divide said ninth signal by a 10th signal representative of a constant and establishes an 11th signal representative of the quotient; means to multiply said first signal by a 12th signal representative of a constant and establish a 13th signal representative of the product; means to multiply said second signal by a 14th signal representative of a constant and establish a 15th signal representative of the product; means to multiply said fourth signal by a 16th signal representative of a constant and establish a 17th signal representative of the product; means to establish an 18th signal representative of a constant; means to add said 13th signal to said 18th signal and to subtract said 15th signal and said 17th signal from the resulting sum to establish a 19th signal representative of the difference; means to multiply said 11signal by said 19th signal and establish a 20th signal representative of the product; means to analyze the fluid mixture being separated at a preselected region of the column and establish a 21st signal representative of the degree of separation; means to compare said 20th and 21st signals and establish a 22nd signal representative of any difference therebetween; and means responsive to said 22nd signal to control the rate at which the heating fluid is withdrawn from the reboiler.
Claim 2
Dependent Claim
440 words
A control system to regulate the heat supplied to a reboiler of a fractionation column which is employed to separate a fluid mixture, by a heating fluid circulated through a reboiler of the column, said Heating fluid being introduced into said reboiler as a compressed gas, said system comprising: means to measure the temperature of the compressed gas introduced into the reboiler and establish a first signal representative thereof; means to measure the temperature of the heating fluid withdrawn from the reboiler and establish a second signal representative thereof; means to introduce the compressed gas into the reboiler through an orifice meter and establish a third signal representative of the differential pressure across the orifice meter; means to measure the pressure of the compressed gas introduced into the reboiler and establish a fourth signal representative thereof; means to multiply said third signal by said fourth signal and establish a fifth signal representative of the product; means to divide said fifth signal by said first signal and establish a sixth signal representative of the quotient; means responsive to said sixth signal to establish a seventh signal representative of the square root of said sixth signal; means to multiply said seventh signal by an eighth signal representative of the orifice constant of the orifice meter and establish a ninth signal representative of the product; means to divide said ninth signal by a 10th signal representative of a constant and establishes an 11th signal representative of the quotient; means to multiply said first signal by a 12th signal representative of a constant and establish a 13th signal representative of the product; means to multiply said second signal by a 14th signal representative of a constant and establish a 15th signal representative of the product; means to multiply said fourth signal by a 16th signal representative of a constant and establish a 17th signal representative of the product; means to establish an 18th signal representative of a constant; means to add said 13th signal to said 18th signal and to subtract said 15th signal and said 17th signal from the resulting sum to establish a 19th signal representative of the difference; means to multiply said 11signal by said 19th signal and establish a 20th signal representative of the product; means to analyze the fluid mixture being separated at a preselected region of the column and establish a 21st signal representative of the degree of separation; means to compare said 20th and 21st signals and establish a 22nd signal representative of any difference therebetween; and means responsive to said 22nd signal to control the rate at which the heating fluid is withdrawn from the reboiler.
Claim 3
Dependent Claim
85 words
The control system of claim 1 wherein said means to analyze comprises an analyzer adapted to establish an output signal representative of the concentration of a first constituent of a sample supplied to the analyzer, and means to pass a sample of fluid to said analyzer from a region of the fractionation column above the point at which the fluid mixture to be separated is introduced, said constituent being a constituent of the fluid mixture which is normally removed from the bottom of the column.
Claim 4
Dependent Claim
434 words
A control system to regulate the heat supplied to a reboiler of a fractionation column which is employed to separate a fluid mixture, by a heating fluid circulated through a reboiler of the column, said heating fluid being introduced into said reboiler as a compressed gas, said system comprising: means to measure the temperature of the compressed gas introduced into the reboiler and establish a first signal representative thereof; means to measure the temperature of the heating fluid withdrawn from the reboiler and establish a second signal representative thereof; means to introduce the compressed gas into the reboiler through an orifice meter and established a third signal representative of the differential pressure across the orifice meter; meaNs to measure the pressure of the compressed gas introduced into the reboiler and established a fourth signal representative thereof; means to multiply said third signal by said fourth signal and establish a fifth signal representative of the product; means to divide said fifth signal by said first signal and establish a sixth signal representative of the quotient; means responsive to said sixth signal to establish a seventh signal representative of the square root of said sixth signal; means to multiply said seventh signal by an eighth signal representative of the orifice constant of the orifice meter and establish a ninth signal representative of the product; means to divide said ninth signal by a 10th signal representative of a constant and establish an eleventh signal representative of the quotient; means to multiply said first signal by a 12th signal representative of a constant and establish a 13th signal representative of the product; means to multiply said second signal by a 14th signal representative of a constant and establish a 15th signal representative of the product; means to multiply said fourth signal by a sixteenth signal representative of a constant and establish a 17th signal representative of the product; means to establish an 18th signal representative of a constant; means to add said 13th signal to 18th signal and to subtract said 15th signal and said seventeenth signal from the resulting sum to establish a 19th signal representative of the difference; means to multiply and eleventh signal by said 19th signal and establish 20th signal representative of the product; means to measure the liquid level in the lower region of the fractionation column and establish a 21st signal representative thereof; means to compare said 20th and 21st signals and establish a 22nd signal representative of any difference therebetween; and means responsive to said 22nd signal to control the rate at which the heating fluid is withdrawn from the reboiler.
Claim 5
Dependent Claim
434 words
A control system to regulate the heat supplied to a reboiler of a fractionation column which is employed to separate a fluid mixture, by a heating fluid circulated through a reboiler of the column, said heating fluid being introduced into said reboiler as a compressed gas, said system comprising: means to measure the temperature of the compressed gas introduced into the reboiler and establish a first signal representative thereof; means to measure the temperature of the heating fluid withdrawn from the reboiler and establish a second signal representative thereof; means to introduce the compressed gas into the reboiler through an orifice meter and established a third signal representative of the differential pressure across the orifice meter; meaNs to measure the pressure of the compressed gas introduced into the reboiler and established a fourth signal representative thereof; means to multiply said third signal by said fourth signal and establish a fifth signal representative of the product; means to divide said fifth signal by said first signal and establish a sixth signal representative of the quotient; means responsive to said sixth signal to establish a seventh signal representative of the square root of said sixth signal; means to multiply said seventh signal by an eighth signal representative of the orifice constant of the orifice meter and establish a ninth signal representative of the product; means to divide said ninth signal by a 10th signal representative of a constant and establish an eleventh signal representative of the quotient; means to multiply said first signal by a 12th signal representative of a constant and establish a 13th signal representative of the product; means to multiply said second signal by a 14th signal representative of a constant and establish a 15th signal representative of the product; means to multiply said fourth signal by a sixteenth signal representative of a constant and establish a 17th signal representative of the product; means to establish an 18th signal representative of a constant; means to add said 13th signal to 18th signal and to subtract said 15th signal and said seventeenth signal from the resulting sum to establish a 19th signal representative of the difference; means to multiply and eleventh signal by said 19th signal and establish 20th signal representative of the product; means to measure the liquid level in the lower region of the fractionation column and establish a 21st signal representative thereof; means to compare said 20th and 21st signals and establish a 22nd signal representative of any difference therebetween; and means responsive to said 22nd signal to control the rate at which the heating fluid is withdrawn from the reboiler.
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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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |