Liquid-Liquid Extraction of Formic Acid with 2-Methyltetrahydrofuran

Experiments, Process Modeling, and Economics

Journal Article (2021)
Author(s)

Antero T. Laitinen (VTT Technical Research Center of Finland)

Vyomesh M. Parsana (Gujarat Technological University)

Olli Jauhiainen (VTT Technical Research Center of Finland)

Marco Huotari (VTT Technical Research Center of Finland)

L.J.P. Van den Broeke (TU Delft - Engineering Thermodynamics)

Wiebren de Jong (TU Delft - Large Scale Energy Storage)

Thijs J.H. Vlugt (TU Delft - Engineering Thermodynamics)

M Ramdin (TU Delft - Engineering Thermodynamics)

Research Group
Engineering Thermodynamics
Copyright
© 2021 Antero T. Laitinen, Vyomesh M. Parsana, Olli Jauhiainen, Marco Huotari, L.J.P. van den Broeke, W. de Jong, T.J.H. Vlugt, M. Ramdin
DOI related publication
https://doi.org/10.1021/acs.iecr.1c00159
More Info
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Publication Year
2021
Language
English
Copyright
© 2021 Antero T. Laitinen, Vyomesh M. Parsana, Olli Jauhiainen, Marco Huotari, L.J.P. van den Broeke, W. de Jong, T.J.H. Vlugt, M. Ramdin
Research Group
Engineering Thermodynamics
Issue number
15
Volume number
60
Pages (from-to)
5588-5599
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Abstract

Formic acid (FA) is an interesting hydrogen (H2) and carbon monoxide (CO) carrier that can be produced by the electrochemical reduction of carbon dioxide (CO2) using renewable energy. The separation of FA from water is challenging due to the strong (cross)association of the components and the presence of a high boiling azeotrope. For the separation of dilute FA solutions, liquid-liquid extraction is preferred over conventional distillation because distilling large amounts of water is very energy-intensive. In this study, we use 2-methyltetrahydrofuran (2-MTHF) to extract FA from the CO2 electrolysis process, which typically contains <20 wt % of FA. Vapor-liquid equilibrium (VLE) data of the binary system 2-MTHF-FA and liquid-liquid equilibrium (LLE) data of the ternary system 2-MTHF-FA-water are obtained. Continuous extraction and distillation experiments are performed to test the extraction power and recovery of 2-MTHF from the extract. The VLE and LLE data are used to design a hybrid extraction and distillation process to produce a commercial grade product (85 wt % of FA). A detailed economic analysis of this hybrid extraction-distillation process is presented and compared with the existing FA separation methods. It is shown that 2-MTHF is a cost-effective solvent for FA extraction from dilute streams (<20 wt % FA).