"Dynamics and Control of a Distillation Train Without Recycle Streams"

N.B. BRIGNOLE; C.A. RUIZ; J.A. ROMAGNOLI

INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH

AMER CHEMICAL SOC

Año: 1990 vol. 29 p. 1875 - 1889

0888-5885

 A detailed study on the dynamics and control of  a complex configuration of two distillation columns without recycle has been carried out. The train separates a mixture of benzene, tuluene, anda o-xylene (BTX) and consist of a prefactionador and a side-stream column. The dynamics aspects were explored with the help of time and frequency domanin plots. The addition of controllers at the prefractionator minimizes the disturbances affecting column 2 most severely. After the variables were properly paired, the open-loop plots were identified and the controllers were designed. A comparison of the results yielded by different multivariables control design methos for some input-output configurations is presented. The resulting schemes had good spectral properties, and they were also tested via linear and nonlinear simulations with sactifactory results.