Patents by Inventor John R. Parrish
John R. Parrish has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20160048139Abstract: A real-time method for operating plant executing a chemical process, comprising continuously, periodically or intermittently obtaining one or more process variable measurements; optionally, continuously, periodically or intermittently estimating one or more inferred process variables from measured process variables and/or mathematical models; estimating the current state of the chemical process based on the process variable measurements and/or inferred process variables; assessing the current state of the chemical process; projecting future probable process state based on the current state of the chemical process; linking the current and/or future probable process state with information in a database, the information comprising preferred actions aimed at favorably influencing the future process state; providing the information to a chemical process plant operating personnel; and optionally, performing manual and/or automatic actions aimed at favorably influencing the future process state of the chemical proceType: ApplicationFiled: March 4, 2014Publication date: February 18, 2016Inventors: Paul K. Samples, John R. Parrish
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Patent number: 9023958Abstract: A method for the delivery of a catalyst to a polymerization reactor is disclosed, comprising: contacting a catalyst with a carrier fluid comprising an inert hydrocarbon in gaseous form, the inert hydrocarbon having a normal boiling point of about ?1° C. to about 81° C.; and flowing the carrier fluid to the polymerization reactor such that the carrier fluid transports the catalyst to the polymerization reactor. A catalyst delivery system is disclosed, comprising: a catalyst vessel for containing a catalyst; a catalyst injection line for delivering the catalyst to a polymerization reactor, the catalyst injection line being in fluid communication with the catalyst vessel and the polymerization reactor; and a carrier fluid line in fluid communication with the catalyst injection line for delivering a carrier fluid comprising an inert hydrocarbon to the catalyst injection line, the inert hydrocarbon having a normal boiling point of about ?1° C. to about 81° C.Type: GrantFiled: October 25, 2012Date of Patent: May 5, 2015Assignee: Univation Technologies, LLCInventors: Dale A. Wright, John R. Parrish, James L. Swecker, II, Mark G. Goode
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Publication number: 20140378640Abstract: A method for the delivery of a catalyst to a polymerization reactor is disclosed, comprising: contacting a catalyst with a carrier fluid comprising an inert hydrocarbon in gaseous form, the inert hydrocarbon having a normal boiling point of about ?1° C. to about 81° C.; and flowing the carrier fluid to the polymerization reactor such that the carrier fluid transports the catalyst to the polymerization reactor. A catalyst delivery system is disclosed, comprising: a catalyst vessel for containing a catalyst; a catalyst injection line for delivering the catalyst to a polymerization reactor, the catalyst injection line being in fluid communication with the catalyst vessel and the polymerization reactor; and a carrier fluid line in fluid communication with the catalyst injection line for delivering a carrier fluid comprising an inert hydrocarbon to the catalyst injection line, the inert hydrocarbon having a normal boiling point of about ?1° C. to about 81° C.Type: ApplicationFiled: October 25, 2012Publication date: December 25, 2014Applicant: UNIVATION TECHNOLOGIES, LLCInventors: Dale A. Wright, John R. Parrish, James L. Swecker, II, Mark G. Goode
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Patent number: 8862438Abstract: A method for improving the prediction of polymer properties and a system having improved polymer property prediction capabilities is provided. The method for improving the prediction of polymer properties comprises: (1) providing a polymer; (2) providing a prediction model; (3) utilizing said prediction model to define an average polymer property prediction value; (4) determining a feasible range; (5) measuring one or more properties of said polymer; (6) determining whether said one or measured polymer properties are within said feasible range: (7) validating said one or more measured polymer properties if said one or more measured polymer properties fall within the feasible range or invalidating said one or more measured polymer properties if said one or more measured polymer properties fall outside of the feasible range; (8) optionally updating said prediction model; (9) repeating said previous steps at least one or more times; and (10) thereby improving the prediction of polymer properties.Type: GrantFiled: July 24, 2008Date of Patent: October 14, 2014Assignee: Dow Global Technologies LLCInventors: Jeffrey B. Drabish, John R. Parrish, Marcel Schaefer, Ivan J. Hartley, Paul K. Samples, Mark L. Nelson
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Patent number: 8742035Abstract: Embodiments of the invention provide a method of controlling a gas-phase polymerization process. The method includes determining a difference between a control variable of the polymerization process, such as the production rate, and the desired value of the control variable; adjusting or maintaining a first manipulated variable to at least partially compensate for the difference between the control variable and the desired value; and adjusting or maintaining a second manipulated variable to at least partially compensate for the effect of adjusting or maintaining the first manipulated variable.Type: GrantFiled: December 12, 2012Date of Patent: June 3, 2014Assignee: Dow Global Technologies LLCInventors: Paul K. Samples, John R. Parrish, Ivan J. Hartley, Jeffrey B. Drabish
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Patent number: 8354481Abstract: The present invention provides methods of controlling a gas-phase polymerization process. The method includes determining a difference between a control variable of the polymerization process, such as the production rate, and the desired value of the control variable; adjusting or maintaining a first manipulated variable to at least partially compensate for the difference between the control variable and the desired value; and adjusting or maintaining a second manipulated variable to at least partially compensate for the effect of adjusting or maintaining the first manipulated variable. The first and second manipulated variables can include process variables such as the fluidized bed weight, the catalyst concentration, the concentration of one or more monomers, the flow of one or more comonomers, the ratio of one comonomer to another comonomer, the activator concentration, the ratio of an activator to selectivity control agent, the concentration of a chain transfer agent, and the retardant concentration.Type: GrantFiled: December 9, 2011Date of Patent: January 15, 2013Assignee: Dow Global Technologies LLCInventors: Paul K. Samples, John R. Parrish, Ivan J. Hartley, Jeffrey B. Drabish
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Patent number: 8293853Abstract: A method and apparatus are disclosed for controlling product discharge from a fluidized bed reactor and for minimizing the loss of the unreacted monomer in the fluidizing gas upon removing the solid polymer product from the reactor. The method and apparatus utilize at least one detector in the product tank or its vent line and a control system in communication with the detector and the product tank fill valve, along with certain algorithms, to adjust by an iterative process, the product discharge time, thereby maximizing resin fill in the product tank and minimizing the lost reactor gas volume.Type: GrantFiled: February 27, 2009Date of Patent: October 23, 2012Assignee: Univation Technologies, LLCInventors: John R. Parrish, Jeffrey B. Drabish, Oscar M. Longoria, Jr., James L. Swecker, II
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Publication number: 20120136482Abstract: The present invention provides methods of controlling a gas-phase polymerization process. The method includes determining a difference between a control variable of the polymerization process, such as the production rate, and the desired value of the control variable; adjusting or maintaining a first manipulated variable to at least partially compensate for the difference between the control variable and the desired value; and adjusting or maintaining a second manipulated variable to at least partially compensate for the effect of adjusting or maintaining the first manipulated variable. The first and second manipulated variables can include process variables such as the fluidized bed weight, the catalyst concentration, the concentration of one or more monomers, the flow of one or more comonomers, the ratio of one comonomer to another comonomer, the activator concentration, the ratio of an activator to selectivity control agent, the concentration of a chain transfer agent, and the retardant concentration.Type: ApplicationFiled: December 9, 2011Publication date: May 31, 2012Applicant: Dow Global Technologies LLCInventors: Paul K. Samples, John R. Parrish, Ivan J. Hartley, Jeffrey B. Brabish
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Patent number: 8093341Abstract: Embodiments of the invention provide a method of controlling a gas-phase polymerization process. The method includes determining a difference between a control variable of the polymerization process, such as the production rate, and the desired value of the control variable; adjusting or maintaining a first manipulated variable to at least partially compensate for the difference between the control variable and the desired value; and adjusting or maintaining a second manipulated variable to at least partially compensate for the effect of adjusting or maintaining the first manipulated variable.Type: GrantFiled: October 18, 2005Date of Patent: January 10, 2012Assignee: Dow Global Technologies LLCInventors: John R. Parrish, Paul K. Samples, Ivan J. Hartley, Jeffrey Brian Drabish
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Patent number: 8071699Abstract: The invention is directed to a polymerization system and method of controlling resin properties during the production of bimodal and multimodal polymer compositions using at least one manipulated variable to minimize dynamic deviations from polymer characteristics. In particular embodiments, the method of control includes determining a property of the resin based on a current and/or previous values or estimates or process variables or polymer characteristics. In this manner the control actions serve to reduce process upsets or facilitate in transitioning to a new product or grade to reduce the amount of off-grade resin material produced during transition or during steady state manufacture.Type: GrantFiled: September 21, 2006Date of Patent: December 6, 2011Assignee: Union Carbide Chemicals & Plastics Technology LLCInventors: John R. Parrish, Mark L. Nelson
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Patent number: 8032328Abstract: The invention provides a novel method of monitoring a process. The method also has the ability to take predetermined actions based on the monitored data. These actions avoid or mitigate process abnormalities or upsets that might impact product quality, production, and/or process efficiencies. The method includes the steps of: obtaining at least one input process variable; determining a comparative process value based on the at least one input process variable using a first method having a first time-based weighting function; determining an expected process value based on the at least one input process variable using a second method having a second time-based weighting function; determining a first deviation value based on the at least one input process variable or historical data; calculating a limit range having a maximum limit and a minimum limit using the expected process value and the first deviation value; and comparing the comparative process value to the limit range.Type: GrantFiled: April 13, 2007Date of Patent: October 4, 2011Assignee: Dow Global Technologies LLCInventors: Paul K. Samples, John R. Parrish, Debbie D. Rath, Thomas J. McNeil
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Publication number: 20100331499Abstract: A method and apparatus are disclosed for controlling product discharge from a fluidized bed reactor and for minimizing the loss of the unreacted monomer in the fluidizing gas upon removing the solid polymer product from the reactor. The method and apparatus utilize at least one detector in the product tank or its vent line and a control system in communication with the detector and the product tank fill valve, along with certain algorithms, to adjust by an iterative process, the product discharge time, thereby maximizing resin fill in the product tank and minimizing the lost reactor gas volume.Type: ApplicationFiled: February 27, 2009Publication date: December 30, 2010Applicant: UNION CARBIDE CHEMICALS & PLASTICS TECHNOLOGY LLC.Inventors: John R. Parrish, Jeffrey B. Drabish, Oscar M. Longoria, JR., James L. Swecker, II
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Publication number: 20100209307Abstract: The instant invention is a method for improving the prediction of polymer properties and a system having improved polymer property prediction capabilities.Type: ApplicationFiled: July 24, 2008Publication date: August 19, 2010Inventors: Jeffrey B. Drabish, John R. Parrish, Marcel Schaefer, Ivan J. Hartley, Pjaul K. Samples, Mark L. Nelson
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Publication number: 20100144967Abstract: The invention is directed to a polymerization system and method of controlling resin properties during the production of bimodal and multimodal polymer compositions using at least one manipulated variable to minimize dynamic deviations from polymer characteristics. In particular embodiments, the method of control includes determining a property of the resin based on a current and/or previous values or estimates or process variables or polymer characteristics. In this manner the control actions serve to reduce process upsets or facilitate in transitioning to a new product or grade to reduce the amount of off-grade resin material produced during transition or during steady state manufacture.Type: ApplicationFiled: September 21, 2006Publication date: June 10, 2010Applicant: UNION CARBIDE CHEMICALS & PLASTICS TECHNOLOGY LLCInventors: John R. Parrish, Mark L. Nelson
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Patent number: 7625987Abstract: A process for controlling a continuous gas phase exothermic process in a reactor comprising: (i) effecting a gas phase exothermic reaction under a set of operating conditions in the presence of a cooling agent, the cooling agent having a pre-selected concentration and feed rate of an induced cooling agent; (ii) determining a maximum production rate (I) without regard to limitations due to the cooling agent under the operating conditions; (iii) determining a maximum production rate (II) with regard to limitations due to the cooling agent under the operating conditions; (iv) calculating an optimal concentration of the induced cooling agent such that the difference between (I) and (II) is minimized; and (v) adjusting the feed rate of the induced cooling agent to achieve the concentration value calculated in (iv).Type: GrantFiled: May 26, 2004Date of Patent: December 1, 2009Assignee: Union Carbide Chemicals & Plastics Technology CorporationInventors: John R. Parrish, Glenn A. Lambert, Daniel N. Thomas
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Publication number: 20090214395Abstract: A method and apparatus are disclosed for controlling product discharge from a fluidized bed reactor and for minimizing the loss of the unreacted monomer in the fluidizing gas upon removing the solid polymer product from the reactor. The method and apparatus utilize at least one detector in the product tank or its vent line and a control system in communication with the detector and the product tank fill valve, along with certain algorithms, to adjust by an iterative process, the product discharge time, thereby maximizing resin fill in the product tank and minimizing the lost reactor gas volume.Type: ApplicationFiled: February 27, 2008Publication date: August 27, 2009Applicant: THE DOW CHEMICAL COMPANYInventors: John R. Parrish, Jeffrey B. Drabish, Oscar M. Longoria, JR., James L. Swecker, II
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Publication number: 20090177439Abstract: The invention provides a novel method of monitoring a process. The method also has the ability to take predetermined actions based on the monitored data. These actions avoid or mitigate process abnormalities or upsets that might impact product quality, production, and/or process efficiencies. The method includes the steps of: obtaining at least one input process variable; determining a comparative process value based on the at least one input process variable using a first method having a first time-based weighting function; determining an expected process value based on the at least one input process variable using a second method having a second time-based weighting function; determining a first deviation value based on the at least one input process variable or historical data; calculating a limit range having a maximum limit and a minimum limit using the expected process value and the first deviation value; and comparing the comparative process value to the limit range.Type: ApplicationFiled: April 13, 2007Publication date: July 9, 2009Inventors: Paul K. Samples, John R Parrish, Debbie R. Rath, Tom J. McNeil
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Publication number: 20080119621Abstract: Embodiments of the invention provide a method of controlling a gas-phase polymerization process. The method includes determining a difference between a control variable of the polymerization process, such as the production rate, and the desired value of the control variable; adjusting or maintaining a first manipulated variable to at least partially compensate for the difference between the control variable and the desired value; and adjusting or maintaining a second manipulated variable to at least partially compensate for the effect of adjusting or maintaining the first manipulated variable.Type: ApplicationFiled: October 18, 2005Publication date: May 22, 2008Applicant: Dow Global Technologies Inc.Inventors: Paul K. Samples, John R. Parrish, Ivan J. Hartley, Jeffrey B. Drabish
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Patent number: 7343225Abstract: In some embodiments, a method for determining initial conditions for a transition from an initial reaction to a target reaction to minimize (or substantially minimize) the amount of off-grade material produced during the transition, and optionally also process control variables for implementing the transition. Some embodiments also include the steps of setting the reaction conditions to determined initial conditions and then implementing the transition.Type: GrantFiled: June 3, 2005Date of Patent: March 11, 2008Assignee: Univation Technologies, LLCInventors: Ivan J. Hartley, John R. Parrish, Rich John Stolz
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Patent number: 6988022Abstract: The present method is directed to techniques for estimating and periodically controlling the reactor split of alpha-olefin polymerizations using multiple catalysts that selectively incorporate monomers and other reactants into polymer compositions. The method provides for the rapid determination of instantaneous reactor split and cumulative split in polymerization reactors by the use of a novel linear relationship between Incorporation and Reactor Split.Type: GrantFiled: April 13, 2004Date of Patent: January 17, 2006Assignee: Univation Technologies, LLCInventors: John R. Parrish, William H. Sachs, Mark G. Goode, Jeffrey Drabish