Cited by 1,917Chemistry and Chemical EngineeringEnvironmental Impact and SustainabilityPhase Equilibria and Thermodynamics

What is a green solvent? A comprehensive framework for the environmental assessment of solvents

Capello, Christian, Fischer, Ulrich, Hungerbühler, Konrad·2007·Green Chemistry

Abstract

Solvents define a major part of the environmental performance of processes in chemical industry and also impact on cost, safety and health issues. The idea of “green” solvents expresses the goal to minimize the environmental impact resulting from the use of solvents in chemical production. Here the question is raised of how to measure how “green” a solvent is. We propose a comprehensive framework for the environmental assessment of solvents that covers major aspects of the environmental performance of solvents in chemical production, as well as important health and safety issues. The framework combines the assessment of substance-specific hazards with the quantification of emissions and resource use over the full life-cycle of a solvent. The proposed framework is demonstrated on 26 organic solvents. Results show that simple alcohols (methanol, ethanol) or alkanes (heptane, hexane) are environmentally preferable solvents, whereas the use of dioxane, acetonitrile, acids, formaldehyde, and tetrahydrofuran is not recommendable from an environmental perspective. Additionally, a case study is presented in which the framework is applied for the assessment of various alcohol–water or pure alcohol mixtures used for solvolysis of p-methoxybenzoyl chloride. The results of this case study indicate that methanol–water or ethanol–water mixtures are environmentally favourable compared to pure alcohol or propanol–water mixtures. The two applications demonstrate that the presented framework is a useful instrument to select green solvents or environmentally sound solvent mixtures for processes in chemical industry. The same framework can also be used for a comprehensive assessment of new solvent technologies as soon as the present lack of data can be overcome.

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Crossref · 10.1039/b617536h

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  • Long-chain polycarbonate and polyester were amenable to quantitative chemical recycling under mild conditions in benign solvents.

    “Both, long-chain polycarbonate and polyester, were amenable to quantitative chemical recycling under mild conditions in benign solvents (Fig. 4a). 25”

    From Closed-loop recycling of polyethylene-like materials (2021) · cites this paper as [25]

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Authors
Capello, C., Fischer, U., & Hungerbühler, K.
Affiliations
ETH Zurich (CH)
Corresponding author
Fischer, Ulrich
Venue
Green Chemistry
Published
2007
Volume
9
Issue
9
Pages
927
ISSN
  • 1463-9262 (ISSN-L)
  • 1463-9270
OpenAlex
W2059098086
Cited by
1,917
References
0
Citations by year
2026: 119 · 2025: 156 · 2024: 147 · 2023: 152 · 2022: 172 · 2021: 169 · 2020: 155 · 2019: 150 · 2018: 130 · 2017: 104 · 2016: 82 · 2015: 77 · 2014: 75 · 2013: 67 · 2012: 52
FWCI
21.14
Type
journal article
Language
en
Open access
closed
Locations
Green Chemistry (publishedVersion)
Funders
Bundesamt für Umwelt
Topics
  • Physical Sciences › Environmental Science › Environmental Chemistry › Chemistry and Chemical Engineering
  • Physical Sciences › Environmental Science › Environmental Engineering › Environmental Impact and Sustainability
  • Physical Sciences › Engineering › Biomedical Engineering › Phase Equilibria and Thermodynamics
Keywords
green solvents, life cycle assessment, solvent emissions, resource utilization (natural resources), chemical hazards, health and safety, organic solvents, alcohol-water mixtures, solvolysis, methanol, ethanol, solvent selection

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