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TIME-OPTIMAL CONTROL OF MMA-MA COPOLYMERIZATION IN A CSTR FOR GRADE CHANGE
Korean Journal of Chemical Engineering, January 1998, 15(1), 45-50(6), 10.1007/BF02705304
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Abstract
The time-optimal control of MMA-MA copolymerization in a CSTR is treated for a grade-change operation. The control objective is to bring system specifications, such as polymer production rate and polymer composition, to desired values in minimum time. The initiator concentration is chosen as a manipulated variable. Two cases are considered : One is to get the time optimal control for both a desired polymer production rate and a desired weight composition of MA in dead copolymer; the other is only for a desired polymer production rate. In numerical calculation, the final tf(i) is chosen at each iteration as the time at which the system reached steady-state. This allows us to use a more easily manipulatable form of the performance index and at the same time not directly use the free final time boundary condition.
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Lee MH, "Modeling and Time-optimal Control of MMA-MA Copolymerization in CSTR," M.S. Thesis, Pohang University of Science and Technology, Korea (1995)
Luus R, Ind. Eng. Chem. Res., 32, 859 (1993)
MacGregor AP, Hamielec AE, Polym. Proc. Eng., 2, 179 (1984)
McAuley KB, MacGregor JF, AIChE J., 38(10), 1564 (1992)
Ponnuswamy SR, Shah SL, Kiparissides CA, Ind. Eng. Chem. Res., 26, 2229 (1987)
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Sacks ME, Lee S, Biesenberger JA, Chem. Eng. Sci., 27, 2281 (1972)
Stengel RF, "Stochastic Optimal Control-Theory and Application," John Wiley & Sons (1986)
