Two-Step Delignification of Miscanthus To Enhance Enzymatic Hydrolysis: Aqueous Ammonia Followed by Sodium Hydroxide and Oxidants

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• 作者：Zhongguo Liu ; Sasisanker Padmanabhan ; Kun Cheng ; Hongxue Xie ; Amit Gokhale ; Waheed Afzal ; Hui Na ; Markus Pauly ; Alexis T. Bell ; John M. Prausnitz
• 刊名：Energy & Fuels
• 出版年：2014
• 出版时间：January 16, 2014
• 年：2014
• 卷：28
• 期：1
• 页码：542-548
• 全文大小：407K
• ISSN：1520-5029

文摘

Pretreatment of miscanthus is essential for enzymatic production of sugars to yield bioethanol. A two-step process using 10 wt % aqueous ammonia in the first step is followed by 1 wt % sodium hydroxide (with or without oxygen or 1 wt % hydrogen peroxide) in the second step. The first step retains about 90% of the cellulose and about 67% of the hemicellulose in the solid while removing about 62% of the lignin. Both steps together achieve 83鈥?0% delignification. Subsequent enzymatic conversion to fermentable sugars is close to 90% after 96 h. While an oxidant does not significantly increase delignification, it has a favorable effect on saccharification of the recovered solid. Infrared spectroscopy, X-ray diffraction, and two-dimensional nuclear magnetic resonance spectroscopy provide data concerning the chemical composition of the recovered solid. Inclusion of an oxidant to the pretreatment breaks 尾-O-4鈥?linked aryl ether bonds of the remaining lignin in the recovered solid.