US3594559A
Expired / Lapsed
US
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Process control for polymerization control system having equation updating feedback networks
Assignee: Phillips Petroleum Co
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Filing: 1968-06-26
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Granted: 1971-07-20
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Expires: 1988-06-26
Abstract
Abstract Emperical equations of type Y A1X1+A2X2+...+AnXn, employed in automatic control systems, are updated continuously in response to measurements of the process being controlled. The updating is accomplished by a computer having feedback networks. The equation updating network is employed in a polymerization control system.
Inventors
- 👤 Troy J Pemberton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:20
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/48; G06G7/58; C; C08; C08F; C08F10/00; G06G7/12; G06G7/122; G06G7/32; G06G7/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
302 words
In a polymerization system wherein monomer, diluent and catalyst are introduced into a polymerization reactor and polymer, unreacted monomer and diluent are removed from the reactor, control apparatus comprising: means to compute the concentration of polymer within the reactor and establish a first signal representative of such computed polymer concentration; means to establish a second signal representative of the concentration of diluent within the reactor; means to measure the concentration of monomer in the reactor effluent and to establish a third signal representative thereof; first, second, third and fourth signal multipliers, each having first and second inputs and an output; means applying said first signal to the first inputs of said first and third signal multipliers; means applying said second signal to the first inputs of said second and fourth signal multipliers; signal-adding means having first and second inputs and an output; means connecting the outputs of said first and second signal multipliers to the respective first and second inputs of said signal-adding means; signal-subtracting means having first and second inputs and an output; means applying said third signal to the first input of said signal-subtracting means; means connecting the output of said signal adding means to the second input of said signal subtracting means; means connecting the output of said signal subtracting means to the second inputs of said third and fourth signal multipliers; first and second integrators, each having an input and an output; means connecting the outputs of said third and fourth signal multipliers to the respective inputs of said first and second integrators; means connecting the outputs of said first and second integrators to the respective second inputs of said first and second signal multipliers; and means responsive to the output signal from said signal adding means and said third signal to control the operation of said reactor.
Claim 2
Dependent Claim
302 words
In a polymerization system wherein monomer, diluent and catalyst are introduced into a polymerization reactor and polymer, unreacted monomer and diluent are removed from the reactor, control apparatus comprising: means to compute the concentration of polymer within the reactor and establish a first signal representative of such computed polymer concentration; means to establish a second signal representative of the concentration of diluent within the reactor; means to measure the concentration of monomer in the reactor effluent and to establish a third signal representative thereof; first, second, third and fourth signal multipliers, each having first and second inputs and an output; means applying said first signal to the first inputs of said first and third signal multipliers; means applying said second signal to the first inputs of said second and fourth signal multipliers; signal-adding means having first and second inputs and an output; means connecting the outputs of said first and second signal multipliers to the respective first and second inputs of said signal-adding means; signal-subtracting means having first and second inputs and an output; means applying said third signal to the first input of said signal-subtracting means; means connecting the output of said signal adding means to the second input of said signal subtracting means; means connecting the output of said signal subtracting means to the second inputs of said third and fourth signal multipliers; first and second integrators, each having an input and an output; means connecting the outputs of said third and fourth signal multipliers to the respective inputs of said first and second integrators; means connecting the outputs of said first and second integrators to the respective second inputs of said first and second signal multipliers; and means responsive to the output signal from said signal adding means and said third signal to control the operation of said reactor.
Claim 3
Dependent Claim
229 words
The apparatus of claim 1 wherein said means to control the operation of said reactor comprises means to regulate the rate at which monomer is introduced into said polymerization reactor. 3 The apparatus of claim 1 wherein said means connecting the output of said siGnal adding means to the second input of said signal subtracting means and said means to control the operation of said reactor comprise: a second signal-adding means having first and second inputs and an output; means connecting the output of the first-mentioned signal-adding means to the first input of said second signal-adding means; signal-lagging means; means connecting the output of said second signal-adding means through said lagging means to the second input of said signal-subtracting means; signal filter means; means connecting the output of said signal-subtracting means through said filter means to the second input of said second signal-adding means; second signal-subtracting means having first and second inputs and an output; means connecting the output of said second signal-adding means to the first input of said second signal-subtracting means; means applying the output signal from said lagging means to the second input of said second signal subtracting means; a controller having an input and a set point; means applying said third signal to the input of said controller; and means connecting the output of said second signal-subtracting means to the set point of said controller.
Claim 4
Dependent Claim
78 words
The apparatus of claim 3 wherein said means connecting the output of said second signal subtractor comprises a third signal-adding means having first and second inputs and an output; means connecting the output of said second subtracting means to the first input of said third adding means; means applying a reference signal to the second input of said third adding means; and means connecting the output of said third adding means to the set point of said controller.
Claim 5
Dependent Claim
67 words
The apparatus of claim 3, further comprising a fifth signal-multiplying means having first and second inputs and an output; means connecting the output of said filter to the first input of said fifth multiplier; means applying a reference signal to the second input of said fifth multiplier; and means connecting the output of said fifth multiplier to the second inputs of said third and fourth signal multipliers.
Claim 6
Dependent Claim
211 words
The apparatus of claim 1 wherein said means to establish said second signal comprises means to establish a fourth signal representative of the rate of flow of monomer to said reactor; means to establish a fifth signal representative of the rate of flow of dilvent to said reactor; third and fourth integrators, each having an input and an output; second signal-adding means having first and second inputs and an output; signal-dividing means having first and second inputs and an output; second signal-subtracting means having first and second inputs and an output; means applying said fourth signal to the input of said third integrator; means applying said fifth signal to the input of said fourth integrator; means connecting the output of said third integrator to first inputs of said second adding means and said dividing means; means connecting the output of said fourth integrator to the second input of said dividing means; means connecting the output of said second adding means to the second input of said dividing means; means applying a reference signal to the first input of said second subtracting means; and means connecting the output of said dividing means to the second input of said second subtracting means, the output of said second subtracting means being said second signal.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |