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Using Diaminomethanal as an Entrainer for the Separation of Isopropanol + Water Mixture

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Abstract

Diaminomethanal (an organic compound), was examined as entrainer for dehydration of isopropanol−water system by extractive distillation. Isobaric vapor−liquid equilibrium (VLE) data were studied for isopropanol−water−diaminomethanal system at 101.3 kPa, employing modified Othmer type still. The VLE data studied for the system comprising diaminomethanal were quite different from that of diaminomethanal-free system. The diaminomethanal represented a significant increase in the relative volatility of the isopropanol−water solution and led to termination of the azeotrope at a specific concentration. It was observed that the relative volatility for isopropanol−water mixture increases continuously with the increase in diaminomethanal concentration till 15.7 mol%. Results demonstrate that diaminomethanal is a functional entrainer for the separation of isopropanol−water mixture and 13 mol% of diaminomethanal concentration is enough to terminate the azeotrope. Furthermore, the experimental VLE data for ternary system were correlated by nonrandom two-liquid (NRTL) model and predicted values correlated with the experimental data very well. Further, the experimental data was verified for thermodynamic consistency by Wisniak–Tamir’s modification of McDermott-Ellis and Wisniak’s L-W thermodynamic consistency test.

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Acknowledgements

The authors acknowledge Thapar Institute of Engineering & Technology, Patiala, India, for the financial support to conduct this research under the Grant TU/SEED/2014/CHE/NS.

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  1. Department of Chemical Engineering, Thapar Institute of Engineering & Technology, Patiala, Punjab, India

    Rajat Kataria, Tarun Jain, Neetu Singh, Jai Prakash Kushwaha & Bandhana Sharma

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  1. Rajat Kataria
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  2. Tarun Jain
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  3. Neetu Singh
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  4. Jai Prakash Kushwaha
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  5. Bandhana Sharma
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Correspondence to Neetu Singh.

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Kataria, R., Jain, T., Singh, N. et al. Using Diaminomethanal as an Entrainer for the Separation of Isopropanol + Water Mixture. J Solution Chem 49, 133–144 (2020). https://doi.org/10.1007/s10953-020-00946-8

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