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Integrated extraction and catalytic upgrading of microalgae lipids in supercritical carbon dioxide

Integrated extraction and catalytic upgrading of microalgae lipids in supercritical carbon dioxide

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ZIMMERER, Julia, Dennis PINGEN, Sandra K. HESS, Tobias KOENGETER, Stefan MECKING, 2019. Integrated extraction and catalytic upgrading of microalgae lipids in supercritical carbon dioxide. In: Green Chemistry. 21(9), pp. 2428-2435. ISSN 1463-9262. eISSN 1463-9270. Available under: doi: 10.1039/C9GC00312F

@article{Zimmerer2019-05-07Integ-45831, title={Integrated extraction and catalytic upgrading of microalgae lipids in supercritical carbon dioxide}, year={2019}, doi={10.1039/C9GC00312F}, number={9}, volume={21}, issn={1463-9262}, journal={Green Chemistry}, pages={2428--2435}, author={Zimmerer, Julia and Pingen, Dennis and Hess, Sandra K. and Koengeter, Tobias and Mecking, Stefan} }

eng Mecking, Stefan Zimmerer, Julia Hess, Sandra K. Koengeter, Tobias Pingen, Dennis Koengeter, Tobias Integrated extraction and catalytic upgrading of microalgae lipids in supercritical carbon dioxide 2019-05-07 Fatty acids from microalgae are attractive compounds for catalytic upgrading to chemicals, but their extraction often requires multi-step procedures and the use of various organic solvents. To relieve this bottleneck, we propose a straightforward approach of combined extraction and catalytic functionalization via olefin cross-metathesis (ethenolysis and butenolysis) in supercritical CO<sub>2</sub> (scCO<sub>2</sub>). This is demonstrated for Phaeodactylum tricornutum microalgae biomass. ScCO<sub>2</sub> at optimum conditions (90 °C, 620 atm, ρ(CO<sub>2</sub>) = 0.90 g mL−1) extracted the lipids selectively and quantitatively from previously disrupted cells, while organic solvent extraction for comparison additionally extracted polar diacylglycerides and chlorophylls. In a one-pot approach, olefin cross-metathesis of the unsaturated fatty acids (FA16:1, FA18:1 and FA20:5) by alkenolysis yielded the desirable mid-chain olefin and unsaturated ester products. The product spectrum compares to alkenolysis of individual model compounds in scCO<sub>2</sub> as well as of separately scCO<sub>2</sub> extracted microalgae oil. Both these ethenolysis and butenolysis proceed with conversions of more than 81% and high selectivities to the desired products. This biorefinery approach was further illustrated by the simultaneous extraction and catalytic isomerizing alkoxycarbonylation in scCO<sub>2</sub>. Zimmerer, Julia Hess, Sandra K. Pingen, Dennis terms-of-use 2019-05-16T14:08:37Z Mecking, Stefan 2019-05-16T14:08:37Z

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