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| Number | Title | Issue Date |
| 8078323 | Method for controlling the process of separating mixtures containing several substances Method for controlling the process of separating mixtures containing several substances having close boiling points and with a known concentration, in a distillation column, wherein the concentration of at least one component is measured at a midpoint of the column,... | 12/13/2011 |
| 7844365 | Field-mounted process device A field-mounted process device with multiple isolated connections includes a connection that can be an input or an output. The given input or output can couple to multiple sensors or actuators, respectively. The process device can be wholly powered through its commu... | 11/30/2010 |
| 7249470 | Method of controlling liquid production utilizing an expert system controller Method for controlling the production of one or more liquid products produced by one or more plants, that can be an air separation plant, that has a liquid storage capacity and that consumes electrical power. Linguistic values related to current liquid inventory, a ... | 07/31/2007 |
| 7227147 | Process for monitoring and controlling nitrating processes with the aid of an online spectrometer A process for monitoring and/or controlling a nitrating process, having the following steps: measuring inline infrared spectra of nitric acid content in a reaction mixture stream downstream of the nitration reaction, preferably nea... | 06/05/2007 |
| 7107194 | High fidelity low-order modeling for multi-staged separation processes based upon the compartmental approach A new way of applying the compartmental approach to the simulation of multi-stage separation processes in the process industry leads to more robust simulation models and higher success rate. The new approach makes use of steady-state component balances, constant vap... | 09/12/2006 |
| 7082348 | Computer based method and system for controlling an industrial process A computer based method for controlling an industrial process that includes at least two unit processes, including the steps of directly controlling the process by a control model including one or more algorithms, and automatic diagnosis of the validity of the proce... | 07/25/2006 |
| 6954701 | Method for remote monitoring of water treatment systems A method of monitoring the daily operating performance parameters for water treatment processes through the collection of localized data. The data is manipulated to generate preconfigured performance, maintenance, and quality assurance reports and further provide au... | 10/11/2005 |
| 6763324 | Integrated engineering analysis process with solution feedback An integrated engineering analysis system that determines at least one final output value in response to at least one initial input value. A first subprocesses provides at least one output value in response to the initial input value. A plurality of subprocesses pro... | 07/13/2004 |
| 6758945 | Method and apparatus for quenching the coke drum vapor line in a coker A method and apparatus for quenching the coke drum vapor line from a coke drum to the main fractionator in a coker unit whereby the volume of quench liquid prevents the drum vapor line from plugging with carbon-based deposits. A differential pressure control techniq... | 07/06/2004 |
| 6751527 | Heat and material balance method of process control for petrochemical plants and oil refineries A method comprising: a) selecting a loading variable from operating variables, the loading variable being directly related to total energy input into the system and equipment constraint of the system; b) selecting a performance specification variable w... | 06/15/2004 |
| 6647745 | Method for controlling the operation of a cryogenic rectification plant A method for controlling the operation of a plant such as a cryogenic rectification plant wherein process parameters are quantitatively determined and then are qualitatively categorized to establish by reference to a rule set the general adjustment requir... | 11/18/2003 |
| 6640161 | Method for operating a steam stripped fractionation column A method of operation of a steam stripped fractionation column by using a computer to process the relevant operating parameters of the column to determine the undesirable approach to a possible flooding condition.... | 10/28/2003 |
| 6581443 | Process for determining the distillation characteristics of liquid petroleum products by express mini-distillation and apparatus permitting implementation of this process "Process for determining the distillation characteristics of liquid petroleum products by express mini-distillation and apparatus permitting implementation of this process" Apparatus characterized by the fact that it includes: a distillation flask dimensioned ... | 06/24/2003 |
| 6560543 | Method for monitoring a public water treatment system A method of monitoring the daily operating performance parameters for water treatment processes through the collection of localized data. The data is manipulated to generate preconfigured performance, maintenance, and quality assurance reports and further... | 05/06/2003 |
| 6332110 | Method for monitoring advanced separation and/or ion exchange processes A method of monitoring advanced separation and/or ion exchange processes through the collection of localized data. The data is manipulated to generate preconfigured performance, maintenance, quality assurance, quality control, regulatory, cost reports, pe... | 12/18/2001 |
| 6317654 | Control of crude refining by a method to predict lubricant base stock's ultimate lubricant preformance A model to predict the quality of a lubricant base stock for use in a plurality of products having a plurality of viscosities. The compositional model is based on a quantitative analysis of key compositional parameters and performance criteria for the plu... | 11/13/2001 |
| 6295485 | Control of lubricant production by a method to predict a base stock's ultimate lubricant performance A model to predict the quality of a lubricant base stock for use in a plurality of products having a plurality of viscosities. The compositional model is based on a quantitative analysis of key compositional parameters and performance criteria for the plu... | 09/25/2001 |
| 6212436 | Dynamic inheritance of software object services Object services like methods or properties are provided to or inherited by objects dynamically during run-time. In one method of providing dynamic inheritance, hierarchical relationships are defined between multiple objects such that each object reference... | 04/03/2001 |
| 6088630 | Automatic control system for unit operation Automatic control systems, and corresponding processes, for controlling either an anode adjuster in a chlor/alkali cell or at least one average middle temperature of a distillation column wherein the combination of feedback control from at least one real ... | 07/11/2000 |
| 6006546 | Nitrogen purity control in the air separation unit of an IGCC power generation system A cryogenic air separation system which is subject to periods of significant changes in product demand is controlled during such periods to minimize the impact of transient operation on product purity. A double-column distillation system is utilized in wh... | 12/28/1999 |
| 5941098 | Method and plant for supplying a variable flow rate of a gas from air Up to a certain value (D1) of the demanded flow rate (D), this flow rate is brought to the working pressure and is sent to the consumer pipe. When the demanded flow rate is less than the value (D1), the complement to (D1) is brought to a high pressure, gr... | 08/24/1999 |
| 5464504 | Inferential correction of composition for a distillation analyzer In a distillation column, which for control purposes cannot tolerate the inherent dead time between analysis of consecutive samples in chromatograph analyzers, the chromatograph output is frequently corrected by inferring a dynamic correction based on the... | 11/07/1995 |
| 5448893 | Process for maximizing the recovery of argon from an air separation system at high argon recovery rates The present invention is a process for maximizing the recovery of argon at high argon recovery rates from an air separation system having a high and low pressure distillation column containing multiple distillation stages of rectification and having a sid... | 09/12/1995 |
| 5431023 | Process for the recovery of oxygen from a cryogenic air separation system A process for recovery of oxygen from a cryogenic air separation system in which measured data at the input or output of a latent heat exchanger and measured data within a column is compared with preselected data so that any deviation therebetween can be ... | 07/11/1995 |
| 5343407 | Nonlinear model based distillation control In a fractional distillation process which performs a binary or limited multicomponent separation, and in which it is desired to maintain composition set points for dual product streams, a computer is programmed for applying model based control. Multivari... | 08/30/1994 |
| 5341313 | Catalyst life prediction in hydrodesulfurization Catalyst life in desulfurization of distillate hydrocarbon streams is predicted with the aid of a computer simulation which embodies an analytical kinetic model of a hydrodesulfurization reaction and a semi-empirical model for catalyst deactivation. The s... | 08/23/1994 |
| 5315521 | Chemical process optimization method A method for producing two or more products from a production site such as an air separation plant to satisfy a given demand for each of the products in which energy consumption and the rate of product production are correlated so that product production ... | 05/24/1994 |
| 5313800 | Process for maximizing the recovery of argon from an air separation system at high argon recovery rates The present invention is a process for maximizing the recovery of argon at high argon recovery rates from an air separation system having a high and low pressure distillation column containing multiple distillation stages of rectification and having a sid... | 05/24/1994 |
| 5302253 | On-line acid monitor and neutralizer feed control of the overhead water in oil refineries A method and apparatus for automatically measuring the acidity of overhead water in an oil refinery, and dispensing a neutralizing agent into the refinery system at a rate responsive to that measurement. A sample of overhead water is collected and passed ... | 04/12/1994 |
| 5260865 | Nonlinear model based distillation control In a fractional distillation process which performs a binary or limited multicomponent separation, and in which it is desired to maintain composition set points for dual product streams, a computer is programmed for applying model based control. Multivari... | 11/09/1993 |
| 5139548 | Gas liquefaction process control system A method for controlling the operation of a liquefied natural gas (LNG) process which utilizes gas turbine-driven refrigeration compressors is disclosed. A feedforward control system compensates for the effects of changes in ambient air temperature on the... | 08/18/1992 |
| 5132918 | Method for control of a distillation process A method for automated control of a petroleum distillation column in which signals representing temperatures, pressures and fluid flow rates for selected product streams withdrawn from the column are transmitted to a digital computer where, by means of a ... | 07/21/1992 |
| 5091844 | Preemptive constraint control A means of controlling a process with a multiplicity of measurements dependent on one process parameter, so that only the most constraining of the measurements manipulates the process in such a way that the performance of each individual controller select... | 02/25/1992 |
| 5053111 | Method and apparatus for the batch distillation of water A method and apparatus for automatically and sequentially distilling batches of water having substantially equal volumes in a plurality of distillation cycles, one batch in each cycle. During each cycle, water is admitted to a boiler tank for a fixed inte... | 10/01/1991 |
| 5047125 | Fractionating column control apparatus and methods Apparatus and methods for determining the Reid Vapor Pressure of either an overhead, side draw or bottoms product stream of a fractionating column used for fractionating a multi-component hydrocarbon feed stream into an overhead product stream, a side dra... | 09/10/1991 |
| 4889600 | Fractionating column control apparatus and methods Apparatus and methods for determining the Reid Vapor Pressure of a bottoms product stream of a fractionating column used for fractionating a multi-component hydrocarbon feed stream into an overhead product stream and a bottoms product stream are provided.... | 12/26/1989 |
| 4817009 | Furnace zone temperature control A computer system for a zone fired furnace generates a plurality of temperature set point signals for a plurality of furnace zones. The set point signals are derived from a master controller acting on the measured temperature of fluid that is heated in th... | 03/28/1989 |
| 4676870 | Automatic control of a multiple-effect evaporator A feedforward control system for a multiple-effect evaporator is provided wherein control is based on maintaining desired values for inferential variables of concentration and boiling point rise for a solution of a solid inorganic substance.... | 06/30/1987 |
| 4624746 | Process for controlling distillation column A process for controlling a distillation column in which a feedstock is distilled for separation into a product from the top of the column having a first predetermined content of an intended component with a high boiling point and a product from the botto... | 11/25/1986 |
| 4617092 | Process for controlling a distillation column A process for controlling a distillation column in which feed liquid supplied thereto is heated by heating steam comprises the steps of: controlling the steam flow rate so that the steam flow rate is increased in response to the difference between the tem... | 10/14/1986 |
