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Optimal design of crystallization-based separation schemes

✍ Scribed by Luis A. Cisternas

Publisher
American Institute of Chemical Engineers
Year
1999
Tongue
English
Weight
229 KB
Volume
45
Category
Article
ISSN
0001-1541

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✦ Synopsis

A network flow model is presented for synthesizing crystallization-based separations for multicomponent systems. The construction of the network flow is based on the identification of feasible thermodynamic states. The method allows consideration of se®eral operation temperatures, complex solid ᎐ liquid equilibrium beha®ior, and se®eral multicomponent feeds and products. For systems with two solutes a linear programming model is obtained, while for systems with three or more solutes a nonlinear programming model is obtained. The relati®e composition diagram is proposed to determine feasible operation points. For a small problem the relati®e composition diagram can be used to recognize flowsheet alternati®es. For large problems, the relati®e composition diagram allows one to decrease the nodes in the network, thus decreasing the execution time. The technique is illustrated with three example problems.

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