2018 - Sustainable Industrial Processing Summit & Exhibition
4-7 November 2018, Rio Othon Palace, Rio De Janeiro, Brazil
Seven Nobel Laureates have already confirmed their attendance: Prof. Dan Shechtman, Prof. Sir Fraser Stoddart, Prof. Andre Geim, Prof. Thomas Steitz, Prof. Ada Yonath, Prof. Kurt Wüthrich and Prof. Ferid Murad. More than 400 Abstracts Submitted from about 60 Countries.
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    Upgrading of Biogas Using Supported Ionic Liquid Phase (SILP) Materials
    Leonard Schill1; Frederik Bork Jansen1; Christian Weibel1; Anders Riisager2; Rasmus Fehrmann1;
    1DTU CHEMISTRY, Lyngby, Denmark; 2DTU CHEMISTRY, Kgs. Lyngby, Denmark;
    PAPER: 72/Molten/Regular (Oral)
    SCHEDULED: 14:00/Tue./Bossa (150/3rd)



    ABSTRACT:
    Upgrading of biogas requires the removal of both CO<sub>2</sub> and H<sub>2</sub>S. Amino Acid based ionic liquids (AA-ILs) are known to efficiently remove CO2 by binding to the carboxylate group and DFT studies suggest that H<sub>2</sub>S can bind to both the carboxylate and the amine group of the amino acid anion. This study has demonstrated that that indeed two moles of H<sub>2</sub>S can bind to one mole of [P4444][Pro] even when a highly dilute stream (750 ppm) is used. Adsorption to the stronger sites (amine groups) is possible even in the presence of a vast excess of CO<sub>2</sub>. There is reason to believe that H<sub>2</sub>S removal levels of > 90 % could be maintained for several days at a space velocity of 100 h-1 with an H<sub>2</sub>S inlet concentration of 750 ppm. Potential pressure drop problems were solved by impregnating the ionic liquid onto mesoporous pellets prepared by a simple and scalable technique. H<sub>2</sub>S removal under relatively mild conditions (60 °C, 50 mbar) was unsuccessful and raises concerns about the ability to regenerate [P4444][Pro]. This might also mean that pure CO<sub>2</sub> removal using [P4444][Pro] requires gas streams practically free of H<sub>2</sub>S.

    References:
    [1] Angelidaki, I.; Treu, L.; Tsapekos, P.; Luo, G.; Campanaro, S.; Wenzel, H.; Kougias, P. G. Biogas upgrading and utilization: Current status and perspectives. Biotechnology Advances 2018, 36, 452-466, doi:10.1016/j.biotechadv.2018.01.011.
    [2] Strauch, S.; Krassowski, J.; Singhal, A. Biomethane Guide for Decision Makers Policy - guide on biogas injection into the natural gas grid. Frauenhaofer UMSICHT, Research group biogas technology 2013. http://www.greengasgrids.eu/fileadmin/greengas/media/Downloads/Documentation_from_the_GreenGasGrids_project/Biomethane_Guide_for_Decision_Makers.pdf
    [3] Liu, S.; Zhou, H.; Song, Q.; Ma, Z. Journal of the Taiwan Institute of Chemical Engineers Synthesis of higher alcohols from CO 2 hydrogenation over Mo-Co-K sulfide-based catalysts. 2017, 76, 18-26, doi:10.1016/j.jtice.2017.04.007.
    [4] Kaas-Larsen, P. K.; Thomassen, P.; Schill, L.; Mossin, S.; Riisager, A.; Fehrmann, R. Selective Reversible Absorption of the Industrial Off-Gas Components CO 2 and NO. ECS Trans. 2016, 75, 3-16, doi:10.1149/07515.0003ecst.
    [5] Jansen, F. B.; Weibel, C. Selective absorption of gases by ionic liquids. Bachelor Thesis, Technical University of Denmark, Kgs. Lyngby, Denmark 2017.