Einladung zum Vortrag im Kolloquium Technische Kybernetik
Control of Different Reactive Distillation Configurations
for Acetic Acid Esterification
Prof. Cheng-Ching Yu
Department of Chemical Engineering
National Taiwan University
Zeit: Montag · 5. 9. 2005 · 11:00 Uhr
Ort: Raum V 3.241 · Pfaffenwaldring 9 · Campus Stuttgart-Vaihingen
Three different flowsheets have been proposed for acetic acid esterification of acetic acid with alcohols ranging from C1 to C5 according to the ranking of normal boiling points and immiscibility. This work explores the similarities and differences in the dynamics and control of these three types of flowsheets. The degree of process nonlinearity is analyzed qualitatively based on the residue curve map (RCM) and the boiling point ranking and it can be computed quantitatively based on the fraction of "sign reversal" for all tray temperatures or based on Allgower's nonlinearity measure. These measures provide useful information to the potential problems in closed-loop control. Next, a systematic design procedure is proposed to devise control structures for all three types of flowsheets for these five esterification systems. The simulation results reveal that reasonable control can be achieved for all five systems with different degrees of asymmetry in closed-loop responses as predicted by the nonlinearity measures. Dual-temperature control and one- temperature- one- composition control are studied. Simulation results clearly show that the simple decentralized control provides a workable solution for highly nonlinear reactive distillation columns under various flowsheet configurations.
Cheng-Ching Yu received the B.S. degree from Tunghai University, Taichung, Taiwan, in 1979 and the M.S. and PhD degrees from Lehigh University in 1982 and 1986, respectively, all in chemical engineering. Since 1986, he had been with the National Taiwan University of Sci. and Technol. for 16 years, currently he is a professor of chemical engineering at National Taiwan University. His current research interests include: multivariable control, plantwide control, design and control of reactive distillation, control of microelectronic processes (CMP, RTP, HDP CVD), modeling and control of fuel processor. Dr. Yu received the Young investigator award from the Chinese Institute of Chemical Engineers (1990), and the Outstanding Research Awards from the National Science Council of Taiwan (1994, 1996, 2003). He published over 90 journal papers and one book (Autotuning of PID Controllers, Springer-Verlag, 1999). He was the program director of chemical engineering research of the National Science Council of Taiwan from 2000 to 2002. He is on the associated editor of the J. Chin. Inst. Chem. Eng.