Enabling integrated biorefineries through high-yield conversion of fractionated pentosans into furfural
Enabling integrated biorefineries through high-yield conversion of fractionated pentosans into furfural
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DOI：
10.1039/c2gc35759c
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发表时间：
2012-10
期刊：
影响因子：
9.8
通讯作者：
A. Mandalika;T. Runge
中科院分区：
文献类型：
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作者：
A. Mandalika;T. Runge
使用酸催化的间歇反应蒸馏方法从生物质水解产物以高产率生产糠醛的稀水溶液，所述方法将蒸气相与水性反应物介质分离。以杂交白杨、芒草、柳枝稷和玉米秸秆为原料，采用硫酸对热水水解液进行脱水。来自反应器的蒸气馏分被冷凝以产生超过基于总戊糖的理论产率85%的糠醛。以木糖为模型化合物，以温度和酸浓度为变量，通过构建三水平统计模型对工艺条件进行优化。生物质的热水水解提供了富含纤维素的固体部分，其具有转化成纸浆或纤维素乙醇的潜力，而富含半纤维素糖的液体部分转化成糠醛。分馏生物质允许探索集成生物精炼厂的概念，其中半纤维素糖在固体流的微生物转化期间未被充分利用或作为潜在抑制剂遇到，而是转化为糠醛，一种有价值的化学前体。纤维素部分进一步转化成纸浆或乙醇的可用性使本方法具有优于工业中使用的常规间歇方法的主要优点，其中理论产率不超过45-50%，明显缺乏可用的纤维素流。
Dilute aqueous solutions of furfural were produced in high yield from biomass hydrolysates using an acid-catalyzed batch reactive distillation process that separated the vapor phase from the aqueous reactant medium. Hot water hydrolysates from hybrid poplar, miscanthus, switchgrass and corn stover were dehydrated using sulfuric acid. The vapor fraction from the reactor was condensed to produce furfural in excess of 85% of the theoretical yield based on total pentose. Using xylose as the model compound, and temperature and acid concentration as the variables, the process conditions were optimized by the construction of a three-level statistical model. Hot water hydrolysis of biomass provided with a cellulose-rich solid fraction which has potential for conversion into pulp or cellulosic ethanol, while the liquid fraction, rich in hemicellulose sugars, was converted into furfural. Fractionating the biomass allows for exploration of the concept of the integrated biorefinery where the hemicellulose sugars are not underutilized or encountered as potential inhibitors during microbial conversions of the solid stream, but are converted into furfural, a valuable chemical precursor. The availability of the cellulose fraction for further conversion into pulp or ethanol gives the current process a major advantage over the conventional batch process used in industry, where theoretical yields do not exceed 45–50% with the conspicuous absence of a usable cellulose stream.