氯化锌在200摄氏度下介导的纤维素降解及产物鉴定。
Zinc chloride mediated degradation of cellulose at 200 degrees C and identification of the products.
作者信息
Amarasekara Ananda S, Ebede Chidinma C
机构信息
Department of Chemistry, Prairie View A&M University, Prairie View, TX 77446, USA.
出版信息
Bioresour Technol. 2009 Nov;100(21):5301-4. doi: 10.1016/j.biortech.2008.12.066. Epub 2009 Jun 21.
The effect of ZnCl(2) on the degradation of cellulose was studied to develop conditions to produce useful feedstock chemicals directly from cellulosic biomass. Cellulose containing 0.5 mol of ZnCl(2)/mol of glucose unit of cellulose was found to degrade at 200 degrees C when heated for more than 60 s in air. The major non-gaseous products of the degradation were identified as furfural, 5-hydroxymethylfurfural and levulinic acid. The maximum yields for furfural and 5-hydroxymethylfurfural are 8% and 9%, respectively, based on glucose unit of cellulose. These yields are reached after 150 s of heating at 200 degrees C. A cellulose sample containing 0.5 mol of ZnCl(2)/mol of glucose unit of cellulose and 5.6 equivalents of water when heated for 150 s at 200 degrees C produced levulinic acid as the only product in 6% yield. The ZnCl(2) mediated controlled degradation of cellulose at 200 degrees C is shown to produce useful feedstock chemicals in low yield.
研究了ZnCl₂对纤维素降解的影响，以开发直接从纤维素生物质生产有用原料化学品的条件。发现当在空气中于200℃加热超过60秒时，含有0.5摩尔ZnCl₂/摩尔纤维素葡萄糖单元的纤维素会发生降解。降解的主要非气态产物被鉴定为糠醛、5-羟甲基糠醛和乙酰丙酸。基于纤维素的葡萄糖单元，糠醛和5-羟甲基糠醛的最大产率分别为8%和9%。这些产率在200℃加热150秒后达到。当含有0.5摩尔ZnCl₂/摩尔纤维素葡萄糖单元和5.6当量水的纤维素样品在200℃加热150秒时，乙酰丙酸作为唯一产物以6%的产率生成。结果表明，ZnCl₂介导的纤维素在200℃的可控降解能以低产率生产有用的原料化学品。
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