Influence of entrainer recycle for batch heteroazeotropic distillation

doi:10.1007/s11705-018-1760-5

Front. Chem. Sci. Eng.

2018, Vol. 12

Issue (4) : 643-659 https://doi.org/10.1007/s11705-018-1760-5

RESEARCH ARTICLE

Influence of entrainer recycle for batch heteroazeotropic distillation

Laszlo Hegely(

), Peter Lang

Department of Building Service and Process Engineering, Faculty of Mechanical Engineering, Budapest University of Technology and Economics, Muegyetem rkp. 3-9, Hungary

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Abstract

Dehydration of isopropanol applying batch heteroazeotropic distillation with toluene as entrainer (E) is investigated. The composition of the feed is near to that of the isopropanol (A)-water (B) azeotrope. The effects of recycling the entrainer and the off-cut are studied by dynamic simulation with a professional flow-sheet simulator. Three consecutive batches (one production cycle) is studied. Both operational modes (Mode I: decantation after distillation and Mode II: decantation during distillation) are simulated. For Mode II, calculations are performed both for Strategy A (distillate from the aqueous (E-lean) phase only) and Strategy B (partial withdrawal of the organic (E-rich phase), as well). The E-rich phase, the final column hold-up and the off-cut (Mode II only) are recycled to the next batch. The influence of the following parameters are determined: quantity of entrainer, reflux ratios of the steps. The variations caused by the recycling in the 2^nd and 3^rd batches are also shown. The best results (lowest specific energy demand and highest recovery of A) are obtained by Mode II, Strategy A. Recycling increases the recovery, and drastically diminishes the entrainer consumption. However, it makes the production slower and decreases the quantity of fresh feed that can be processed.

Keywords batch distillation heteroazeotropic distillation operational policies off-cut recycle entrainer

Corresponding Author(s): Laszlo Hegely

Just Accepted Date: 10 July 2018 Online First Date: 19 December 2018 Issue Date: 03 January 2019

Cite this article:

Laszlo Hegely,Peter Lang. Influence of entrainer recycle for batch heteroazeotropic distillation[J]. Front. Chem. Sci. Eng., 2018, 12(4): 643-659.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-018-1760-5
https://academic.hep.com.cn/fcse/EN/Y2018/V12/I4/643

Tab.1 Measured boiling points and azeotropic compositions

Tab.2 Binary interaction parameters for describing vapour-liquid equilibrium (UNIQUAC)

Tab.3 Calculated boiling points and azeotropic compositions

Tab.4 Measured liquid-liquid equilibrium data (25 °C)

Tab.5 Binary interaction parameters for describing liquid-liquid equilibrium (UNIQUAC)

Tab.6 Calculated liquid-liquid equilibrium data (25 °C).

Fig.1 Calculated residue curve map and binodal solubility curve with the tie-lines at 25 °C

Fig.2 State-task-network of (a) Mode I, (b) Mode II

Fig.3 ChemCAD 7.0 model (Mode II)

Fig.4 The production speed of Mode I as a function of the reflux ratios for different F_E values: (a) F_E = 3 kmol, (b) F_E = 4 kmol, (c) F_E =5 kmol (Batch I)

Tab.7 Results of Batch I for Mode I

Fig.5 Influence of F_E on the still path (Mode I, Batch I, Step 0 is not included)

Fig.6 The production speed of Mode II as a function of R₂ and D_min (Batch I, F_E = 1.4 kmol)

Fig.7 Influence of F_E on the still path (Mode II, Strategy A, Batch I; Step 0 is not shown)

Tab.8 Results of Batch I for different operational policies of Mode II

Fig.8 Variation of the charge composition due to the recycling

Fig.9 Variation of the still path during the processing cycle (Mode I, Step 0 is not shown)

Tab.9 Results for Batch II and Batch III

Tab.10 Summary of the results for the whole production cycle

Fig.10 Evolution of instantaneous distillate composition of Batch II (Mode I)

Tab.11 Results for the partial recycling of off-cut D₂ (Mode I)

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