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Sakai, Hiroki ; Kuroda, Kosuke ; Muroyama, Shiori ; Tsukegi, Takayuki ; Kakuchi, Ryohei ; Takada, Kenji ; Hata, Ayano ; Kojima, Ryosuke ; Ogoshi, Tomoki ; Omichi, Masaaki ; Ninomiya, Kazuaki ; Takahashi, Kenji ; 黒田, 浩介 ; 生越, 友樹 ; 仁宮, 一章 ; 髙橋, 憲司
概要:
金沢大学理工研究域生命理工学系<br />As an alternative to petroleum-based compatibilizing agents, we developed lignin derivatives for co
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mpatibilizing agents of carbon fiber-reinforced plastics that have thermoplasticity. In this study, alkyl chains were introduced into alkali lignin at various ratios to optimize the compatibility of the lignin derivatives with both polypropylene and carbon fiber. The interfacial shear strength between the two materials was improved from 8.2 to 17.2 MPa by mixing with the optimized lignin derivative. The value is comparable to that achieved with a typical petroleum-based compatibilizing agent (18.3 MPa).<br />Embargo Period 6 months<br />This paper has supplementary information.
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| 2.
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Kuroda, Kosuke ; Inoue, Ken ; Miyamura, Kyohei ; Takada, Kenji ; Ninomiya, Kazuaki ; Takahashi , Kenji
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Lignocellulosic biomass was hydrolyzed by combining an acidic ionic liquid, 1-(1-butylsulfonic)-3-methylimidazolium hydr
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ogen sulfate, and microwave heating, resulting in high glucose yields and short reaction times. This new approach achieved 40% glucose yield from bagasse within 12 min at 160°C; whereas, almost no glucose was yielded with a well-known method involving H2SO4 and conventional heating within 30 min at the same temperature. It was confirmed that the reaction temperature significantly affected glucose yield and reaction rate; whereas, the concentration of the acidic ionic liquid only affected the reaction rate. Three kinds of lignocellulosic biomass, including bagasse (herbaceous biomass), eucalyptus (hardwood), and Japanese cedar (softwood), were examined. Glucose yield was in the range of 30–40%, indicating that the present method effectively hydrolyzes various kinds of lignocellulosic biomasses.
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| 3.
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Satria, Heri ; Kuroda, Kosuke ; Endo, Takatsugu ; Takada, Kenji ; Ninomiya, Kazuaki ; Takahashi, Kenji
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A highly efficient hydrolytic method using an acidic ionic liquid is proposed: pretreatment of biomass with H2SO4; simpl
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e in situ synthesis of an acidic ionic liquid, 1-(1-butylsulfonic)-3-methylimidazolium hydrosulfate ([(HSO3)4C4C1im]HSO4), through addition of a zwitterion to the pretreated solution; and subsequent hydrolysis in the [(HSO3)4C4C1im]HSO4 solution at 100 °C under microwave heating. The high yields of glucose and xylose (around 80 and 100%, respectively) were attributed to the pretreatment by H2SO4 and the efficient catalytic activity of the [(HSO3)4C4C1im]HSO4. The high yields were comparable to the highest yields of acid hydrolysis at around 100 °C among previous literature, and the present method achieved more rapid hydrolysis. Decomposition of glucose and xylose was negligible because the reaction temperature was relatively mild. We also identified an electrodialysis method to separate [(HSO3)4C4C1im]HSO4 into H2SO4 and the zwitterion for reuse. Almost all of the H2SO4 (97%) was transferred to the concentrate compartment, and 99% of the zwitterion remained in the dilute compartment during electrodialysis.<br />Embargo Perid 12 months / Published online 24 October 2016
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Kuroda, Kosuke ; Miyamura, Kyohei ; Satria, Heri ; Takada, Kenji ; Ninomiya, Kazuaki ; Takahashi, Kenji
概要:
Cellulose was hydrolyzed using a novel biphasic system consisting of water and an acidic and hydrophobic ionic liquid. T
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he biphasic system enabled a simple separation of the resulting glucose aqueous solution and ionic liquid. Additionally, a fermentation inhibitor, 5-(hydroxymethyl)furfural, could be removed from the aqueous phase into the ionic liquid phase. The yield of glucose in cellulose hydrolysis was 12.9% at 190 °C. The distribution ratio of glucose in the aqueous phase was 0.98 with an ionic liquid/water ratio of 0.13 (w/w), indicating that most of the glucose was recovered into the aqueous phase. 5-(Hydroxymethyl)furfural was absorbed into the ionic liquid phase from the aqueous phase. The concentration of 5-(hydroxymethyl)furfural in the aqueous phase decreased from 37 to 1.9 mM, which was lower than the concentration at which fermentation is inhibited (24 mM). The acidic and hydrophobic ionic liquids did not decompose during the cellulose hydrolysis and could be recycled four times. © 2016 American Chemical Society.<br />Embargo Period 12 months
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| 5.
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Kuroda, Kosuke ; Shimomura, Kai ; Ishijima, Tatsuo ; Takada, Kenji ; Ninomiya, Kazuaki ; Takahashi, Kenji
概要:
Biomass was dissolved in ionic liquids under non-thermal atmospheric pressure plasma irradiation. On plasma irradiation,
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the amount of dissolved biomass in the ionic liquids increased from 15 to 29mg for bagasse and from 26 to 36mg for Japanese cedar. The high solubility was attributed to the deconstruction of the lignin network by active chemical species generated by the plasma. Selective extraction of cellulose from biomass was observed under plasma irradiation. © CSIRO 2017.<br />This study was also partly supported by a Grant-in-Aid for Scientific Research from the Japan Society for the Promotion of Science. | Japan Society for the Promotion of Science 日本学術振興会
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Kuroda, Kosuke ; Shimomura, Kai ; Ishijima, Tatsuo ; Takada, Kenji ; Ninomiya, Kazuaki ; Takahashi, Kenji
概要:
Biomass was dissolved in ionic liquids under non-thermal atmospheric pressure plasma irradiation. On plasma irradiation, the amount of dissolved biomass in the ionic liquids increased from 15 to 29 mg for bagasse and from 26 to 36 mg
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for Japanese cedar. The high solubility is attributed to the deconstruction of the lignin network by active chemical species generated by the plasma. Selective extraction of cellulose from biomass was observed under the plasma irradiation.<br />CH16554 Accepted 03 November 2016
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| 7.
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高田, 健司 ; Takada, Kenji
概要:
北陸先端科学技術大学院大学 / 金沢大学<br />i触媒機能を有するといわれている、1-エチル-3-メチルイミダゾリウム系イオン液体を触媒としてメタクリル酸メチルの重合を行い高分子量のポリマーを得た。触媒にアニオン種の異なるイオン液体を使
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用したが重合性を示したものはアセテートアニオンを有したイオン液体のみであった。イオン液体の触媒機能を利用してセルロースの修飾反応を検討したところ、非常に高効率にエステル化が進行した。さらに反応後の溶液からイオン液体を分離（リサイクル）し、もう一度同様の反応を行ったところ、リサイクル前と同等の反応性を示した。このことから本研究は環境低負荷な手法であり、かつ天然由来の材料を合成できる新たな反応系となるといえる。<br />Ionic liquid catalyzed polymerization was carried out by using methyl methacrylate and 1-ethyl-3-methylimidazolium type ionic liquid as a monomer and catalyst, respectively. Although ionic liquids different in anionic species were used as catalysts, those that showed polymerization ability were only ionic liquids with acetate anions of 1-ethyl-3-methylimidazolium acetate. By using the catalytic activity of 1-ethyl-3-methylimidazolium acetate, the transesterification reaction of cellulose proceeded very highly efficiently. Further, the ionic liquid was separated (recycled) from the solution after the reaction, and the same reaction was carried out once again, and it showed reactivity equivalent to that before recycling. From these results, it can be said that this research is an eco-friendly method and a new reaction system that can synthesize naturally occurring materials.<br />研究課題/領域番号:16K17911, 研究期間(年度):2016-04-01 – 2018-03-31
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