TY - JOUR
T1 - Microwave-assisted solubilization of microalgae in high-temperature ethylene glycol
AU - Tsubaki, Shuntaro
AU - Oono, Kiriyo
AU - Onda, Ayumu
AU - Kadono, Takashi
AU - Adachi, Masao
AU - Mitani, Tomohiko
N1 - Funding Information:
Parts of this study was performed through the Program to Disseminate the Tenure Tracking System of the Ministry of Education, Culture, Sports, Science, and Technology of Japan at Kochi University , JSPS Grant-in-Aid for Young Scientists (B) 15K18814 , JSPS Grant-in-Aid for Young Scientists (A) 17H05049 and Analysis and Development System for Advanced Materials (ADAM) at the Research Institute for Sustainable Humanosphere, Kyoto University . We thank Prof. Minoru Ikehara (Kochi University) for CHNS analysis. We thank Dr. Masanori Okauchi ( National Research Institute of Aquaculture , Japan Fisheries Research and Education Agency, Japan ) for providing P. tricornutum strain NRIA-0065.
Funding Information:
Parts of this study was performed through the Program to Disseminate the Tenure Tracking System of the Ministry of Education, Culture, Sports, Science, and Technology of Japan at Kochi University, JSPS Grant-in-Aid for Young Scientists (B) 15K18814, JSPS Grant-in-Aid for Young Scientists (A) 17H05049 and Analysis and Development System for Advanced Materials (ADAM) at the Research Institute for Sustainable Humanosphere, Kyoto University. We thank Prof. Minoru Ikehara (Kochi University) for CHNS analysis. We thank Dr. Masanori Okauchi (National Research Institute of Aquaculture, Japan Fisheries Research and Education Agency, Japan) for providing P. tricornutum strain NRIA-0065.
Publisher Copyright:
© 2019
PY - 2019/11
Y1 - 2019/11
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85072394444&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85072394444&partnerID=8YFLogxK
U2 - 10.1016/j.biombioe.2019.105360
DO - 10.1016/j.biombioe.2019.105360
M3 - Article
AN - SCOPUS:85072394444
SN - 0961-9534
VL - 130
JO - Biomass and Bioenergy
JF - Biomass and Bioenergy
M1 - 105360
ER -
