The extraction, characterization, purification and upgrading of algal lipids was examined, utilizing Scenedesmus acutus microalgae grown with flue gas from a coal-fired power plant. Lipid extraction was achieved using a procedure based on the Bligh-Dyer method, modified so as to utilize a significantly decreased solvent:biomass ratio than the original protocol. Both activated carbon and K10 montmorillonite were found to function as efficient adsorbents for the removal of chlorophyll, phospholipids and sterols from the crude algae oil. The yield of purified lipids using this approach was similar to that obtained by in situ transesterification of the lipids in S. acutus, confirming that adsorption is an effective method for the removal of non-esterifiable lipids. During the deoxygenation of the purified algae oil at 260 °C over a Ni-Al layered double hydroxide catalyst, deactivation of the catalyst was observed, attributed to the presence of highly unsaturated lipid chains which can act as poisons by adsorbing strongly to the catalyst surface and/or acting as precursors to coke formation. However, upgrading at 300 °C gave better results, the liquid product consisting of ∼99 wt% hydrocarbons, diesel-like (C10-C20) hydrocarbons constituting 76 wt% of the liquid after 4 h on stream.
|Number of pages||11|
|State||Published - Sep 15 2016|
Bibliographical noteFunding Information:
This material is based upon work supported by the National Science Foundation under Grant No. 1531637 . Financial support for this work was also provided by the Kentucky Department of Energy Development and Independence , and Duke Energy . Additional funding was provided by a Seed Grant of the University of Kentucky Center for Applied Energy Research . Michael Wilson, Dr. Jack Groppo and Stephanie Kesner are thanked for providing the algae used in this study. Taylor Bramel, Renan Sales and Ryan Loe are thanked for their technical assistance. Doug Durst is thanked for his invaluable support.
© 2016 Elsevier Ltd. All rights reserved.
ASJC Scopus subject areas
- Chemical Engineering (all)
- Fuel Technology
- Energy Engineering and Power Technology
- Organic Chemistry