Enhanced yields of furfural and other products by simultaneous solvent extraction during thermochemical treatment of cellulosic biomass
Enhanced yields of furfural and other products by simultaneous solvent extraction during thermochemical treatment of cellulosic biomass
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DOI：
10.1039/c3ra41857j
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发表时间：
2013-06
期刊：
影响因子：
3.9
通讯作者：
Taiying Zhang;R. Kumar;C. Wyman
中科院分区：
文献类型：
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作者：
Taiying Zhang;R. Kumar;C. Wyman
由戊糖衍生的糠醛是用于从纤维素生物质生产用作直接燃料的烃的关键反应性中间体之一。同时萃取到与水不混溶的溶剂中可以通过将糠醛从水性环境中除去而显著提高糠醛产率，否则该产率将受到糠醛快速降解为炭和其他富碳化合物（松散地称为胡敏素）的限制。因此，在该研究中，对于在170 °C下在0.1M硫酸或盐酸中的5wt%固体的反应，在一定范围的反应时间内，确定了有机溶剂甲基异丁基酮（MIBK）在提高来自枫木的糠醛产率方面的有效性。为了比较，纯木糖、葡萄糖和Avicel纤维素也在相同条件下反应。将基于同时水解和脱水的各种工艺配置与酸水解然后脱水成糠醛进行比较，同时进行萃取和不进行萃取。在没有MIBK萃取的情况下，当枫木与硫酸或盐酸反应约40-45 min时，最大糠醛产率小于65%。然而，当MIBK萃取与硫酸催化组合使用50 min时，产率显著增加至约85.3%，而MIBK萃取与盐酸催化组合使用时，产率仅增加至约67.0%。与单独的酸的结果相比，用MIBK同时萃取也提高了其他产物如5-HMF和乙酰丙酸的产率。
Furfural derived from pentose sugars is one of the key reactive intermediates for production of hydrocarbons from cellulosic biomass for use as drop-in fuels. Simultaneous extraction into a solvent immiscible in water can substantially enhance furfural yields by removing it from the aqueous environment where the yield would otherwise be limited by its rapid degradation to chars and other carbon rich compounds that are loosely termed humins. Thus, in this study, the effectiveness of the organic solvent methyl isobutyl ketone (MIBK) in improving furfural yields from maple wood was determined for reactions of 5 wt% solids in 0.1 M sulfuric or hydrochloric acid at 170 °C over a range of reaction times. For comparison, pure xylose, glucose, and Avicel cellulose were also reacted under the same conditions. Various process configurations based on simultaneous hydrolysis and dehydration were compared to acid hydrolysis followed by dehydration to furfural with and without simultaneous extraction. Without MIBK extraction, the maximum furfural yields were less than 65% when maple wood was reacted for about 40–45 min with either sulfuric or hydrochloric acid. However, the yield increased significantly to about 85.3% when MIBK extraction was employed in combination with sulfuric acid catalysis for 50 min, while combining MIBK extraction with hydrochloric acid catalysis only increased the yield to ∼67.0%. Simultaneous extraction with MIBK also improved yields of other products such as 5-HMF and levulinic acid, compared to results from the acids alone.