Efficient Hydrolysis of Polysaccharides in Bagasse by in Situ Synthesis of an Acidic Ionic Liquid after Pretreatment

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• 作者：Heri Satria ; Kosuke Kuroda ; Takatsugu Endo ; Kenji Takada ; Kazuaki Ninomiya ; Kenji Takahashi
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2017
• 出版时间：January 3, 2017
• 年：2017
• 卷：5
• 期：1
• 页码：708-713
• 全文大小：302K
• ISSN：2168-0485

文摘

A highly efficient hydrolytic method using an acidic ionic liquid is proposed: pretreatment of biomass with H₂SO₄; simple 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.