Monday, May 4, 2009
9-74
Eco-Ethanol Production from Lignocellulosics with Hot-Compressed Water Treatment Followed by Acetic Acid Fermentation and Hydrogenolysis
Shiro Saka, Natthanon Phaiboonsilpa, Yosuke Nakamura, Shozo Masuda, Xin Lu, Kazuchika Yamauchi, Hisashi Miyafuji, and Haruo Kawamoto. Department of Socio-Environmental Energy Science, Graduate School of Energy Science, Kyoto University, Yoshida-honmachi, Sakyo-ku, Kyoto, 606-8501, Japan
Purpose of the work: We propose a newly-developed process for bioethanol production from lignocellulosics by applying acetic acid fermentation.
Approach: The ethanol production system involving two-step hot-compressed water treatment coupled with acetic acid fermentation followed by the subsequent catalytic hydrogenolysis.
Scientific innovation and relevance: Japanese beech flours were firstly treated in two-step hot-compressed water and obtained various mono-saccharides, oligo-saccharides and even uronic acid were found to be converted into acetic acid by Clostridium thermoaceticum. The obtained acetic acid was then esterified and converted into ethanol by catalytic hydrogenolysis.
Results and conclusions: A new ethanol production process involving hot-compressed water treatment followed by acetic acid fermentation and catalytic hydrogenolysis was proposed. This process does not need any acid as a catalyst, such as sulfuric acid, for hydrolysis of lignocelluloses. The obtained various saccharides, not only hexoses but also pentoses, and uronic acid could be anaerobically fermented to acetic acid without any carbon dioxide emitted. Acetic acid is then esterified to acetate ester which is further converted into ethanol by catalytic hydrogenolysis. Consequently, the high-convertible bioethanol production process with highly-effective CO2 reduction could be established.
Approach: The ethanol production system involving two-step hot-compressed water treatment coupled with acetic acid fermentation followed by the subsequent catalytic hydrogenolysis.
Scientific innovation and relevance: Japanese beech flours were firstly treated in two-step hot-compressed water and obtained various mono-saccharides, oligo-saccharides and even uronic acid were found to be converted into acetic acid by Clostridium thermoaceticum. The obtained acetic acid was then esterified and converted into ethanol by catalytic hydrogenolysis.
Results and conclusions: A new ethanol production process involving hot-compressed water treatment followed by acetic acid fermentation and catalytic hydrogenolysis was proposed. This process does not need any acid as a catalyst, such as sulfuric acid, for hydrolysis of lignocelluloses. The obtained various saccharides, not only hexoses but also pentoses, and uronic acid could be anaerobically fermented to acetic acid without any carbon dioxide emitted. Acetic acid is then esterified to acetate ester which is further converted into ethanol by catalytic hydrogenolysis. Consequently, the high-convertible bioethanol production process with highly-effective CO2 reduction could be established.