By J. K. Walters
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Additional info for Process Optimisation. A Three-Day Symposium Organised by the Midlands Branch of the Institution of Chemical Engineers and Held at the University of Nottingham, 7–9 April 1987
Although, in this approach the process as a whole is optimised, an important formulation effort is required to obtain a continuous problem from the initial MIP by using an approximation strategy of all the discontinuities (corrective factors in cost evaluation and specification or purity constraints). The methodology is illustrated by the synthesis of benzene chlorination processes, involving one or two reactors. C. -UACNRS192 ChemindelaLoge 31078 TOULOUSE Cedex - FRANCE 31 IChemE SYMPOSIUM SERIES No.
100 PROBLEM FORMULATION The general flowsheet of plant under consideration is shown in Figure 1. Eech continuous reaction unit of the process is an ideal isothermal well stirred tank reactor (CSTR) and after the reaction step the output components are separated in a separation sequence and then the products are either removed or recycled to the reactors. The simple separators of the sequence are plate distillation columns, because distillation fslhe unit operation that is most commonly used for separating mixtures.
The separation of a feed containing N components into two product streams with N-1 components forms the first separation step Sj = 1. In general, the separation step number Sj (1 ί Sj i N-1) contains the set of the separations of feeds with N+1 -s, components into N-Sj component products (see Figure 2). So the NLP problem can be stated as follows (FLOQUET, 1986). ptC'p + g p ^ P c ^ p ^ ) ) under the constraints: r Σ Y°p,ri * 1 n=i p= 1 t o 2 i N ' n - ! (linear r Σ r 1 Y p,ri * constraints) 1 i=l 35 iChemE SYMPOSIUM SERIES No.
Process Optimisation. A Three-Day Symposium Organised by the Midlands Branch of the Institution of Chemical Engineers and Held at the University of Nottingham, 7–9 April 1987 by J. K. Walters