Reaction chemistry and phase behavior of lignin in high-temperature and supercritical water
Reaction chemistry and phase behavior of lignin in high-temperature and supercritical water
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DOI：
10.1016/j.biortech.2007.08.008
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发表时间：
2008-06-01
影响因子：
11.4
通讯作者：
Kozinski, Janusz A.
中科院分区：
文献类型：
--
作者：
Fang, Zhen;Sato, Takafumi;Kozinski, Janusz A.
在50 nL的微反应器中，结合光学、拉曼和红外显微镜，在温度高达600摄氏度、水密度高达1165 kg/m的条件下，研究了有机溶解木质素在水/苯酚溶液中的分解(3)。研究发现，当苯酚与木质素+水混合使用时，形成了一种均相，似乎促进了木质素通过水解和热解分解成酚类碎片。在均相反应条件下，苯酚也抑制了酚类化合物的再聚合，促进了成油。另一方面，在没有苯酚的情况下，木质素在研究的条件范围内与水保持非均相。阐明了苯酚的均相条件和抑制苯酚成焦的条件，发现苯酚和木质素的混合物在400-600℃和高水密度428-683 kg/m时均相(3)。对应的最大压力为93兆帕。这些结果被进一步用来提出反应路径。(c) 2007 Elsevier Ltd.版权所有。
Decomposition of organosolve lignin in water/phenol solutions was studied in a 50 nL micro-reactor coupled with optical, Raman and infrared microscopies at temperatures up to 600 degrees C and water densities up to 1165 kg/m(3). It was found that when phenol was used with {lignin + water} mixtures that a homogenous phase was formed that seemed to promote the decomposition of lignin into phenolic fragments by hydrolysis and pyrolysis. Phenol, along with the homogenous reaction conditions also inhibited re-polymerization of the phenolics and promoted oil formation. On the other hand, in the absence of phenol, lignin remained as a heterogeneous phase with water over the range of conditions studied. The homogeneous conditions and conditions for inhibiting char formation by phenol were elucidated and it was found that mixtures of phenol and lignin become homogeneous at 400-600 degrees C and high water densities of 428-683 kg/m(3). corresponding to maximum pressures of 93 MPa. These results were further used to propose reaction paths. (c) 2007 Elsevier Ltd. All rights reserved.