title: Hydrothermal liquefaction of Spirulina and Nannochloropsis salina under subcritical and supercritical water conditions.
abstract: Six hydrothermal liquefaction experiments on Nannochloropsis salina and Spirulina platensis at subcritical and supercritical water conditions (220–375 °C, 20–255 bar) were carried out to explore the feasibility of extracting lipids from wet algae, preserving nutrients in lipid-extracted algae solid residue, and recycling process water for algae cultivation. GC–MS, elemental analyzer, FT-IR, calorimeter and nutrient analysis were used to analyze bio-crude, lipid-extracted algae and water samples produced in the hydrothermal liquefaction process. The highest bio-crude yield of 46% was obtained on N. salina at 350 °C and 175 bar. For S. platensis algae sample, the optimal hydrothermal liquefaction condition appears to be at 310 °C and 115 bar, while the optimal condition for N. salina is at 350 °C and 175 bar. Preliminary data also indicate that a lipid-extracted algae solid residue sample obtained in the hydrothermal liquefaction process contains a high level of proteins.
authors: Department of Energy Technology, Aalborg University, DK-9220 Aalborg, Denmark.
authors: Saqib S
authors: SS
authors: Toor
authors: Harvind
authors: H
authors: Reddy
authors: Shuguang
authors: S
authors: Deng
authors: Jessica
authors: J
authors: Hoffmann
authors: Dorte
authors: D
authors: Spangsmark
authors: Linda B
authors: LB
authors: Madsen
authors: Jens Bo
authors: JB
authors: Holm-Nielsen
authors: Lasse A
authors: LA
authors: Rosendahl
mesh_terms: D002458:Cell Fractionation / Q000379:methods*; D000458:Cyanobacteria / Q000737:chemistry*; D005240:Feasibility Studies; D006358:Hot Temperature; D008055:Lipids / Q000302:isolation & purification*; D011312:Pressure; D014867:Water / Q000737:chemistry*
chemical_list: D008055:Lipids; D014867:Water