Abstract
The integration of reaction and extractive distillation system is beneficial for reducing the process cost. A systematic method is proposed to identify the optimal solvent, solvent-to-feed ratio, extractive distillation sequence and reactor operating conditions based on the integration of reactor and extractive distillation. The non-key component matrix method is used to generate the extractive distillation sequences. The proposed method can be used to evaluate different solvents, solvent-to-feed ratios, as well as the extractive distillation sequences; the optimal extractive distillation parameters corresponding to the minimum total annualized cost (TAC) can be identified considering different operating conditions. For the selective hydrogenation of benzene to cyclohexene process, the minimum total annualized cost of unit desired product, 4.01 $·kmol−1, is achieved when the reactor’s inlet temperature is 333 K, solvent N-Formylmorpholine and sequence S2 are employed, and the solvent-to-feed ratio is 4.
Highlights
Considering Its Integration withExtractive distillation can be applied to separate mixtures that are difficult to separate by common distillation
This paper aims to propose a method for identifying the optimal extractive distillation sequence based on the integration of the reactor and the extractive distillation system
Procedures will be developed to analyze the impact of variations in reactor operating conditions, solvent and solvent-to-feed ratio to the cost; and the reactor and extractive distillation systems composed of different sequences will be evaluated based on the total annualized cost (TAC)
Summary
Extractive distillation can be applied to separate mixtures that are difficult to separate by common distillation. With the thermodynamic analysis combined with residue curve maps, isovolatility line, univolatility line and material balance lines, Sun et al determined the optimal solvent and extractive distillation sequence for acetonitrile–ethanol–water ternary azeotropic mixture [8]. In these studies, the optimal solvent and its flowrate were selected based on the isovolatility curves, vapor–liquid equilibrium diagrams, etc., and the effects of the solvent on components’ volatility and energy consumption of extractive distillation columns were studied. Procedures will be developed to analyze the impact of variations in reactor operating conditions, solvent and solvent-to-feed ratio to the cost; and the reactor and extractive distillation systems composed of different sequences will be evaluated based on the TAC. A selective hydrogenation of benzene to cyclohexene process will be studied to illustrate the application of proposed method
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