Biodiesel production by supercritical process with crude bio-methanol prepared by wood gasification.
In order to prepare a genuine biodiesel, it is essential to use methanol prepared from biomass but not natural gas for biodiesel production. Thus, we have proposed to use crude bio-methanol produced by wood gasification for biodiesel production. Since such a bio-methanol contains some impurities, an effect of its impurities was studied on the biodiesel production by supercritical method. In general, impurities in crude bio-methanol are reported to include methyl formate, ethanol, 1-butanol, diisopropyl ether, water, etc. Triglycerides and oleic acids were, thus, treated with these impurities under supercritical conditions. As a result, it was found that methyl formate, ethanol and 1-butanol could convert them to fatty acid alkyl esters (BDF), whereas no conversion was achieved with diisopropyl ether. Thus, crude bio-methanol can be used for BDF production as a substitute for methanol from fossil resources. However, due to more efficient reaction, crude bio-methanol can be more applicable to the two-step supercritical methanol process, consisting of hydrolysis of triglycerides and subsequent esterification of fatty acids, compared with the one-step supercritical methanol process, where transesterification of triglycerides is a major reaction.
Isayama
Yohei
Y
Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto 606-8501, Japan.
Saka
Shiro
S
D001674:Bioelectric Energy Sources; D001709:Biotechnology / Q000379:methods*; D004951:Esterification; D004952:Esters / Q000378:metabolism; D005227:Fatty Acids / Q000378:metabolism; D005740:Gases / Q000378:metabolism*; D000432:Methanol / Q000138:chemical synthesis*; D019301:Oleic Acid / Q000378:metabolism; D012997:Solvents; D013696:Temperature; D014280:Triglycerides / Q000378:metabolism; D014934:Wood / Q000378:metabolism*
D004952:Esters; D005227:Fatty Acids; D005740:Gases; D012997:Solvents; D014280:Triglycerides; D019301:Oleic Acid; D000432:Methanol