Comparing the Recalcitrance of Eucalyptus, Pine, and Switchgrass Using Ionic Liquid and Dilute Acid Pretreatments
Comparing the Recalcitrance of Eucalyptus, Pine, and Switchgrass Using Ionic Liquid and Dilute Acid Pretreatments
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DOI：
10.1007/s12155-012-9220-4
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发表时间：
2013-03-01
影响因子：
3.6
通讯作者：
Singh, Seema
中科院分区：
文献类型：
--
作者：
Li, Chenlin;Sun, Lan;Singh, Seema
松树，桉树，柳枝稷进行了评估，通过离子液体和稀酸预处理和随后的酶水解的可发酵糖的生产。结果表明，在三种原料中，柳枝稷具有最高的糖产率和更快的水解速率，对于两种预处理技术，在24 h后达到48%（稀酸）和96%（离子液体）的糖产率。在两种木材中，在160 A ° C下用[C（2）mim][OAc]预处理3小时后，桉树比松树具有更高和更快的糖回收率（24小时内93%对62%）。松木和桉树在1.2%稀酸和160 A ℃下预处理15 min是无效的，表明需要进一步提高反应温度或酸浓度以提高预处理材料的消化率。拉曼光谱数据表明，在预处理过程中发生的木质素解聚的程度也因三种不同的原料而异。在类似的半纤维素去除条件下，离子液体预处理中木质素的去除有助于提高纤维素转化率。这一发现可能有助于解释观察到的糖化产率和动力学的变化。这些结果表明，离子液体预处理不仅改善了所有三种原料相对于稀酸的糖化，而且更好地处理了它们之间的差异，表明对原料变化的更好耐受性。
Pine, eucalyptus, and switchgrass were evaluated for the production of fermentable sugars via ionic liquid and dilute acid pretreatments and subsequent enzymatic hydrolysis. The results show that among the three feedstocks, switchgrass has the highest sugar yields and faster hydrolysis rates for both pretreatment technologies by achieving 48 (dilute acid) and 96 % (ionic liquid) sugar yields after 24 h. Of the two wood species, eucalyptus has a higher and faster sugar recovery after ionic liquid pretreatment than pine (93 vs. 62 % in 24 h) under 160 A degrees C for 3 h with [C(2)mim][OAc]. Pretreatment of pine and eucalyptus is observed to be ineffective under 1.2 % dilute acid condition and 160 A degrees C for 15 min, indicating that further enhancement of reaction temperature or acid concentration is necessary to increase the digestibility of pretreated materials. Raman spectroscopy data show that the extent of lignin depolymerization that occurs during pretreatment also varies for the three different feedstocks. Under similar hemicellulose removal conditions, lignin removal in ionic liquid pretreatment can help improve cellulose conversion. This finding may help explain the observed variation in the saccharification yields and kinetics. These results indicate that ionic liquid pretreatment not only improved saccharification over dilute acid for all three feedstocks but also better dealt with the differences among them, suggesting better tolerance to feedstock variability.