Hydrothermal decomposition of various crystalline celluloses as treated by semi-flow hot-compressed water
Hydrothermal decomposition of various crystalline celluloses as treated by semi-flow hot-compressed water
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DOI：
10.1007/s10086-014-1401-7
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发表时间：
2014-05
影响因子：
2.9
通讯作者：
R. Abdullah;K. Ueda;S. Saka
中科院分区：
文献类型：
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作者：
R. Abdullah;K. Ueda;S. Saka
用半流动热压缩水(HCW)在230~270℃/10℃/15℃的条件下，对已调整聚合度的各种结晶纤维素I、II、III、III、IVI和IVII的水热分解进行了研究。这些处理导致了纤维素的部分或全部分解，分解产物主要以水解物、脱水物和碎片物以及水溶部分中的有机酸的形式被回收。他们的水热分解及其动力学结果表明，纤维素的分解依赖于结晶纤维素的类型以及HCW处理的温度。270℃/10℃/15℃/15℃下WS部分的结果表明，II组(第II单元、第III单元、第IVII单元)的分解难度低于第I组(第I单元、第III单元、第IVI单元)，这表明第II组对HCW处理的分解抵抗力较弱。因此，纤维素的分解行为是由于其晶体结构的内在差异造成的。
Various types of crystalline celluloses I, II, IIII, IIIII, IVIand IVIIthat have been adjusted for their degree of polymerization were treated by semi-flow hot-compressed water (HCW) at 230–270 °C/10 MPa/15 min to study their hydrothermal decomposition. The treatments resulted in either partial or complete decomposition of the celluloses and the decomposed products were primarily recovered as hydrolyzed, dehydrated and fragmented ones as well as organic acids in the water-soluble (WS) portions. Their results of hydrothermal decomposition and its kinetics revealed that the celluloses decomposition is dependent on the types of crystalline celluloses as well as temperature of the HCW treatment. The outcome from the WS portions at 270 °C/10 MPa/15 min showed that the degree of difficulty for decomposition is lower in group II (cell II, cell IIIII, cell IVII) than group I (cell I, cell IIII, cell IVI), indicating that group II is less resistant to decomposition by HCW treatment. Therefore, the decomposition behaviors of the cellulose are due to the inherent differences in the crystalline structures.