Nonlinear model based distillation control
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United States of America Patent
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Nov 9, 1993
Grant Date -
N/A
app pub date -
Apr 1, 1991
filing date -
Apr 1, 1991
priority date (Note) -
Expired
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Abstract
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. Multivariable, noninteracting control of the distillation process is achieved by utilizing a nonlinear model, which calculates process vapor and distillate flow rates required to maintain product set points. The model, which applies tray-to-tray calculation essentially derived from a McCabe-Thiele analysis, is periodically updated by adjusting tray efficiency based on steady state composition measurements to keep the model in pace with changing process conditions.
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