Data processing: generic control systems or specific application – Specific application – apparatus or process – Chemical process control or monitoring system
Reexamination Certificate
2007-06-28
2011-11-15
Sines, Brian J (Department: 1772)
Data processing: generic control systems or specific application
Specific application, apparatus or process
Chemical process control or monitoring system
C700S268000, C422S129000
Reexamination Certificate
active
08060258
ABSTRACT:
A multivariable method and process controller is for controlling a catalyzed chemical reaction to form phthalic anhydride (PA), produced by a production unit including a chemical reactor having a plurality of pipes connected in parallel having inner surfaces affixed with at least one solid catalyst. The reactor implements a process for forming PA by receiving flows of reagents including at least one oxidizable substituted aromatic and an oxygen including source gas at one or more inlets of the reactor. A dynamic multivariable model for the process represents the effects of moving a plurality of manipulated variables (MVs) including a flow of the oxygen including source gas and a flow or temperature of the oxidizable substituted aromatic on controlled variables (CVs) including a temperature at a plurality of positions along a length of the pipes. During the process, a first parameter related to performance of the catalyst in producing PA and a second parameter including a temperature at one or more of the plurality of positions in measured. Using the dynamic model, the temperature in the plurality of positions along the length of the reactor are automatically adjusting based on at least the first measured parameter, which permits the temperature profile to be adjusted to compensate for ageing of the catalyst to improve production efficiency.
REFERENCES:
patent: 6380399 (2002-04-01), Okuno et al.
patent: 2003/0073787 (2003-04-01), Stephens et al.
Honeywell International , Inc.
Jetter & Associates, P.A.
Sines Brian J
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