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A Raman spectroscopic approach to investigate the production of biodiesel from soybean oil using 1-alkyl-3-methylimidazolium ionic liquids with intermediate chain length

Johanna Abrahamsson (Institutionen för kemi och kemiteknik) ; Emil Andreasson (Institutionen för kemi och kemiteknik) ; Niklas Hansson (Institutionen för kemi och kemiteknik, Kärnkemi) ; David Sandström (Institutionen för kemi och kemiteknik) ; Ellinor Wennberg (Institutionen för kemi och kemiteknik) ; M. Maréchal ; Anna Martinelli (Institutionen för kemi och kemiteknik, Teknisk ytkemi)
Applied Energy (0306-2619). Vol. 154 (2015), p. 763-770.
[Artikel, refereegranskad vetenskaplig]

We present a Raman spectroscopic study of the conversion of soybean oil into biodiesel by methanol using the lipase B enzyme pseudomonas cepacia as the bio-catalyst and 1-alkyl-3-methylimidazolium ionic liquids (CnC1Im) as co-solvents, where the alkyl chain length is varied from ethyl (n=2) to decyl (n=10). We have limited this study to a low reaction temperature, 40°C, and a low enzyme concentration to investigate the possibility of producing biodiesel with low energy and cost demands. We also demonstrate that Raman spectroscopy is a powerful and straightforward method to estimate the yield of the transesterification reaction, by analysis of the characteristic CO stretching mode found in the range ~1730-1750cm-1. Our results indicate that both reaction yield and reaction rate increase with the chain length, but also that for chains longer than decyl further improvements are marginal. We discuss these results from the viewpoint of local interactions and local structure of the investigated ionic liquids.

Nyckelord: Biodiesel , Ionic liquids , Raman spectroscopy

Denna post skapades 2015-06-23. Senast ändrad 2017-06-30.
CPL Pubid: 218728


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