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A hybrid approach to model predictive control of a polymer grade transition problem is developed. The controller is posed as a mixed integer programming problem in which the discrete elements of the algorithm include both linear switching models used to approximate the nonlinear process and operating heuristics that are incorporated as propositional logic inequalities. The algorithm is tested in simulation on a polypropylene loop reactor system. Feed rates of monomer, hydrogen, and catalyst are manipulated to regulate slurry density, melt flow rate, and production rate, for various grades. Robust performance is demonstrated for grade transitional control. [ABSTRACT FROM AUTHOR]

Focuses on the complications associated with the design and furnishing of overseas projects in the Middle East. Information on the Western Contract International (WCI), a firm specializing in overseas projects; Features of Khartoum Hilton hotel in Sudan, one of the projects of WCI; Factors that have contributed to the difficulties associated with overseas projects; Challenges faced by WCI in their projects in Saudi Arabia.