Abstract
A general approach based on the theory of distillation-trajectory tearing off is adopted in the synthesis of optimal separation flowsheets for multicomponent azeotropic mixtures. The first stage of the synthesis—presynthesis—is considered, at which feasible product compositions are predicted for the separation in a simple column, a two-feed column, and a column with a decanter.
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Abbreviations
- F, D, B, E :
-
feed, overhead-product, bottom-product, and entrainer fluxes, respectively
- K l :
-
phase equilibrium coefficient of the ith component
- N :
-
nodal point of a trajectory bundle
- n :
-
number of components
- R, S :
-
reflux and reboil ratios, respectively
- S :
-
saddle point of a trajectory bundle
- V, L :
-
vapor and liquid fluxes, respectively
- x i y 1 :
-
concentration of the ith component in the liquid and vapor phases, respectively
- rev:
-
reversible distillation
- B :
-
bottom product
- D :
-
overhead product
- E :
-
entrainer
- i = 1, ...n,j = 1, ...n3 :
-
component no
- r :
-
top section
- s :
-
bottom section
- t :
-
tear-off point
- -:
-
unstable node
- +:
-
stable node
References
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Petlyuk, F.B., Danilov, R.Y. Synthesis of separation flowsheets for multicomponent azeotropic mixtures on the basis of the distillation theory. Presynthesis: prediction of feasible product compositions. Theor Found Chem Eng 34, 236–254 (2000). https://doi.org/10.1007/BF02755972
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DOI: https://doi.org/10.1007/BF02755972