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      Role of life-cycle externalities in the valuation of protic ionic liquids – a case study in biomass pretreatment solvents

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          Abstract

          The combination of LCA and monetization has revealed that protic ionic liquids can be sustainable alternatives to conventional solvents.

          Abstract

          Ionic liquids have found their way into many applications where they show a high potential to replace traditional chemicals. But concerns over their ecological impacts (toxicity and biodegradability) and high cost have limited their use so far. The outcome of existing techno-economic and life-cycle assessments comparing ionic liquids with existing solvents has proven hard to interpret due to the many metrics used and trade-offs between them. For the first time, this paper couples the concept of monetization with detailed process simulation and life-cycle assessment to estimate the true cost of ionic liquids. A comparative case study on four solvents used in lignocellulosic biomass pretreatment is conducted: triethylammonium hydrogen sulfate [TEA][HSO 4], 1-methylimidazolium hydrogen sulfate [HMIM][HSO 4], acetone from fossil sources, and glycerol from renewable sources. The results show that the total monetized cost of production accounting for externalities can be more than double the direct costs estimated using conventional economic assessment methods. [TEA][HSO 4] is found to have the lowest total cost, while glycerol presents the highest total cost. We expect this methodology to provide a starting point for future research and development in sustainable ionic liquids.

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          Conceptual design of chemical processes

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            Chemical Engineering Design. Principles, Practices and Economics of Plant and Process Design

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              Ionic Liquids in Synthesis

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                Author and article information

                Contributors
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                Journal
                GRCHFJ
                Green Chemistry
                Green Chem.
                Royal Society of Chemistry (RSC)
                1463-9262
                1463-9270
                May 26 2020
                2020
                : 22
                : 10
                : 3132-3140
                Affiliations
                [1 ]Department of Chemical Engineering
                [2 ]Imperial College London
                [3 ]South Kensington Campus
                [4 ]UK
                [5 ]Departamento Ingeniería Química y del Medio Ambiente
                [6 ]Escuela Técnica Superior de Ingenieros Industriales
                [7 ]Universidad Politécnica de Madrid
                [8 ]C/José Gutiérrez Abascal, 2, 28006 Madrid
                [9 ]Spain
                [10 ]Institute for Chemical and Bioengineering
                [11 ]Department of Chemistry and Applied Biosciences
                [12 ]ETH Zürich
                [13 ]Vladimir-Prelog-Weg 1, 8093 Zürich
                [14 ]Switzerland
                Article
                10.1039/D0GC00058B
                e4803f18-9cc0-4f12-8eea-d206b91924e8
                © 2020

                http://creativecommons.org/licenses/by/3.0/

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