Microwave-assisted solubilization of microalgae in high-temperature ethylene glycol

Shuntaro Tsubaki, Kiriyo Oono, Ayumu Onda, Takashi Kadono, Masao Adachi, Tomohiko Mitani

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Four types of microalgae (Chlorella vulgaris, Nannochloropsis oculata, Fistsulifera solaris (JPCC DA0580), and Phaeodactylum tricornutum Strain NRIA-065) were liquefied through noncatalytic solvothermal solubilization under microwave (MW) irradiation using ethylene glycol (EG) as a reaction media. C. vulgaris and N. occulata exhibited higher solubilization rates and bio-crude oil yields in a temperature range at 300 °C while diatoms (Fistsulifera. Solaris and Phaeodactylum tricornutum) were recalcitrant to MW treatment owing to its high ash content. Bio-crude oil yield increased depending on the reaction temperature and reaction time. In particular, nearly 38% bio-crude oil was obtained under a reaction at 300 °C for 40–60 min from C. vulgaris. Higher heating values of bio-crude oil of 39 and 28 MJ kg−1 were attained in the chloroform and ethyl acetate layers in EG soluble fraction, respectively. Dielectric measurement of the reaction system indicated the effectiveness of ethylene glycol as a medium for absorbing MW energy. EG was efficient reaction medium for rapid heating up by MWs to facilitate solubilization of microalgae at low pressure.

Original languageEnglish
Article number105360
JournalBiomass and Bioenergy
Publication statusPublished - Nov 2019
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Forestry
  • Renewable Energy, Sustainability and the Environment
  • Agronomy and Crop Science
  • Waste Management and Disposal


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