Nonlinear model based distillation control

Details Nonlinear model based distillation control Nonlinear model based distillation control

1991-04-01

1993-11-09

Smith, Jerry

Boots, shoes, and leggings

364501, 203 1, 203 3, 203DIG18, G06F 1546, G05B 1304

Patent

active

052608654

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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P. L. Lee et al. "Generic Model Control" Computer Chemical Engineering, vol. 12, No. 6, Pergamon Press, 1988.
T. J. Williams et al., "Automatic Control in Continuous Distillation", Industrial and Engineering Chemistry, vol. 48, No. 6, 1956, pp. 1008-1019.

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