Praxair Technology, Inc.

Michael D Jordan

Dante Patrick Bonaquist

Thomas C Hanson

Mark H Karwan

A method of process control using linear programming models to implement the control of one or more controlled variables to maintain a desired target value over a given time horizon. The controlled variables are controlled by a process controller which adjusts manipulated variables in real time. The method uses two linear programming models with the second model computed from the solution of the first in which the absolute value of the deviation for each controlled variable from its target value over a specified time horizon is computed. This permits the controlled variables to be adjusted with the changes in the manipulated variables held to a minimum over the time horizon under control.

Two-phase method for real time process control

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 may be determined from a conventional mixed integer linear programming model the solution of which will provide an optimum production schedule for producing product to meet total product demand at minimum energy cost over a given time horizon.

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Williamsville, NY, United States of America

Michael D Jordan