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On the energetic efficiency of producing polyoxymethylene dimethyl ethers from CO2 using electrical energy

Abstract

Polyoxymethylene dimethyl ethers (OME) are promising electricity-based fuels (e-fuels). They enable low emissions of particulate matters and nitrogen (di)oxide. In this work the energetic efficiency of the OME production from CO2 and electrical energy is calculated. CO2 capture is included in the analysis by considering direct air capture and post combustion capture technologies. CO2 is converted to methanol using hydrogen produced by electrolysis. Two routes for OME synthesis are studied: OME synthesis directly from methanol and formaldehyde and OME synthesis via the two intermediates methylal and trioxane. The energetic efficiency is evaluated for different levels of heat integration. The efficiency of the OME production was calculated for variable electrolysis efficiencies. For an electrolysis efficiency of 60 %, it ranks between 24.3 - 36.7 %. The production of 1 kg OME3-5 (LHV of 18.9 MJ per kg) has an energy demand of 51.6 - 78.0 MJ. A comparison of the energetic efficiencies of the production of different e-fuels and evaluation of future potential sets OME in an overall context.

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Publication details

The article was received on 28 Sep 2018, accepted on 09 Jan 2019 and first published on 10 Jan 2019


Article type: Paper
DOI: 10.1039/C8EE02849D
Citation: Energy Environ. Sci., 2019, Accepted Manuscript
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    On the energetic efficiency of producing polyoxymethylene dimethyl ethers from CO2 using electrical energy

    M. Held, Y. Tönges, D. Pélerin, M. Härtl, G. Wachtmeister and J. Burger, Energy Environ. Sci., 2019, Accepted Manuscript , DOI: 10.1039/C8EE02849D

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