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58,80 €ISBN 978-3-8440-9364-3Softcover182 pages32 figures248 g21 x 14,8 cmEnglishThesis
January 2024
Manuel Christian Bauer
Pressurized Dimethyl Ether Extraction of Lipid-containing Microalgae
In contrast to classical, oleaginous biomasses, microalgae are usually characterized by an increased water content and a relatively simple, albeit very robust, structure. Both properties represent a significant challenge for established processes. Consequently, an alternative method for lipid extraction from microalgae was investigated in this work: Extraction with liquefied dimethyl ether (DME).
Therefore, the solvent properties of DME, known uses, and existing (regulatory) framework were examined in depth.
Batch extractions of four different freeze-dried microalgae (Arthrospira platensis, Nannochloropsis gaditana, Phaeodactylum tricornutum, and Scenedesmus almeriensis) were performed to assess the influence of algae pre-treatment and species on crude oil yields and fatty acid extraction with DME.
Follow-up experiments with P. tricornutum revealed that the water content of the biomass plays a crucial role in the extraction.
The presented work demonstrated that lipid extraction with liquefied DME is a promising unit operation for algae-biorefineries. In the case of P. tricornutum, energy consuming drying or alternative feedstock pretreatment is not required. This fundamental advantage could play a pivotal role for the competitiveness of microalgae-based production in the future.
Therefore, the solvent properties of DME, known uses, and existing (regulatory) framework were examined in depth.
Batch extractions of four different freeze-dried microalgae (Arthrospira platensis, Nannochloropsis gaditana, Phaeodactylum tricornutum, and Scenedesmus almeriensis) were performed to assess the influence of algae pre-treatment and species on crude oil yields and fatty acid extraction with DME.
Follow-up experiments with P. tricornutum revealed that the water content of the biomass plays a crucial role in the extraction.
The presented work demonstrated that lipid extraction with liquefied DME is a promising unit operation for algae-biorefineries. In the case of P. tricornutum, energy consuming drying or alternative feedstock pretreatment is not required. This fundamental advantage could play a pivotal role for the competitiveness of microalgae-based production in the future.
Keywords: DME; Pressurized liquid extraction; Lipid extraction; Biorefinery; Bioeconomy
Schriftenreihe des Fachgebiets Konversionstechnologien nachwachsender Rohstoffe
Edited by Prof. Dr. Andrea Kruse, Hohenheim
Volume 11
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