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Non-linear model predictive control of process

A model and control device technology, applied in the direction of program control, adaptive control, general control system, etc., can solve problems such as lack of stability

Pending Publication Date: 2022-05-27
DOW GLOBAL TECH LLC
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, such methods continue to lack stability for processes with steady-state gain reversal

Method used

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  • Non-linear model predictive control of process
  • Non-linear model predictive control of process
  • Non-linear model predictive control of process

Examples

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[0123] A control device for a chemical system implementing a process with steady state gain reversal is applied to maximize the selectivity of the reaction to ethylene oxide (EO). A silver-based catalyst for the selective oxidation of ethylene to ethylene oxide is used to produce ethylene oxide, thereby minimizing secondary reactions that reduce ethylene oxide (EO) selectivity. For conventional catalysts, the EO selectivity does not reach values ​​higher than 85.7%, which has long been regarded as the theoretical maximum selectivity for the following overall reaction:

[0124] 7C 2 H 4 +6O 2 →6C 2 H 4 O+2CO 2 +2H 2 O(33).

[0125] Some commercial ethylene epoxidation reactors use a co-fed chlorination promoter, which is adsorbed on the catalyst to modify by promoting or moderating certain reaction pathways and in this way increasing the selective oxidation of ethylene oxide. Efficient commercial catalysts tend to exhibit relatively steep parabolic curves for EO selecti...

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Abstract

Provided herein is a chemical system for exhibiting operation of steady state gain reversal, and the chemical system comprises: a reactor configured to receive a feed stream and generate an outlet stream to form a process; and a control device configured to control the process. The control device receives an input indicative of an operating parameter and receives an output variable, and provides a steady-state manipulation input configured to control or optimize the process in response to the input and the output variable. The control device includes an input disturbance model, a state estimator, a non-linear steady-state target calculator, and a regulator configured to provide a signal for regulating one or more inputs based on the steady-state manipulation input and associated output variables.

Description

Background technique [0001] The production of alkylene oxides can be accomplished via a chemical system that utilizes the catalytic epoxidation of olefins in the presence of oxygen using a silver-based catalyst. Conventional silver-based catalysts used in such processes typically provide relatively low efficiency or "selectivity" (eg, a lower percentage of reacted alkylene to the desired alkylene oxide). In some processes, when conventional catalysts are used in the epoxidation of ethylene, the theoretical maximum efficiency towards ethylene oxide, expressed as a fraction of converted ethylene, does not reach above the 6 / 7 or 85.7% limit value of . [0002] Certain such catalysts, such as the so-called "high selectivity" or "high efficiency" catalysts, tend to exhibit relatively steep efficiency curves as a function of gas phase promoter concentration, as the concentration is far from the value that provides high efficiency ( For example, the change in efficiency relative to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B13/04
CPCG05B13/048G05B13/0265G05B19/058C07C29/152G06F17/18G05B2219/24075G05B13/0285
Inventor R·宾得里什
Owner DOW GLOBAL TECH LLC
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