Life cycle assessment of phase-change solvents for post-combustion CO2 capture

Examensarbete för masterexamen

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Type: Examensarbete för masterexamen
Master Thesis
Title: Life cycle assessment of phase-change solvents for post-combustion CO2 capture
Authors: Rosin, Thibaud
Gustafsson, Maja
Abstract: As climate change and global warming is one of the greatest challenges of the 21st century, several mitigation methods are under development. Post-combustion CO2 capture and storage are one of the most mature industrial methods to capture and store CO2. The capture includes the use of a CO2 absorbing solvent. In the ROLINCAP project, several phase-changing solvents are under investigation. By using a phase-changing solvent, the energy requirement of the CO2 capture has been proven to decrease. However, while a lot of research is focused on finding new and improved solvents, the cradle-to-gate environmental impact of their production is unknown. During this study, this environmental impact of DMCA, MCA, MAPA and S1N, characteristic solvents exhibiting phase change behavior alone or in blends, have been investigated. DMCA and MCA can be used alone as phase-changing solvents. A procedure was developed which enables the life-cycle-assessment of non-conventional, non-industrially produced chemicals. The method consisted of three main steps; (1) a literature study in order to find industrially suitable routes of synthesis for the compounds, (2) modelling the different manufacturing processes in Aspen Plus, and studying the impact of key parameters, and (3) using the results of the modelling to perform cradle-togate LCAs (looking at Cumulative Energy Demand, GlobalWarming Potential (100a) and total ReCiPe (H.A) indicators). By applying this method to the representative solvents mentioned above, an assessment of their environmental impact could be made. It was found that the environmental impact of the MAPA production was the smallest, followed by S1N and DMCA, while the highest impact was MCA. However, the impact per captured tonne CO2 could only be calculated for MCA, due to a lack of data for the other compounds. Thus no comparison between the compounds could be made. The cradle-to-gate LCA also gives insights to what parts of the production processes are the most environmentally damaging. Thus, this study does not only provide data to bridge the gaps in the environmental foot print of post-combustion CO2 capture processes based on characteristic phase-changing solvents, but is also very useful for further research on the environmentally weak points of process synthesis of such solvents.
Keywords: Energi;Hållbar utveckling;Energiteknik;Energy;Sustainable Development;Energy Engineering
Issue Date: 2019
Publisher: Chalmers tekniska högskola / Institutionen för rymd-, geo- och miljövetenskap
Chalmers University of Technology / Department of Space, Earth and Environment
Collection:Examensarbeten för masterexamen // Master Theses

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