Supercritical water treatment of biomass for energy and material recovery
Supercritical water treatment of biomass for energy and material recovery
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DOI：
10.1080/00102200500290815
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发表时间：
2006-01-01
影响因子：
1.9
通讯作者：
Adschiri, T
中科院分区：
文献类型：
--
作者：
Matsumura, Y;Sasaki, M;Adschiri, T
本文综述了超临界水液化和气化的研究进展。超临界水气化适用于从湿生物质中回收能量，而超临界水液化则为在材料回收方面有效处理生物质物种打开了大门。纤维素是生物质的主要成分之一，在超临界水中是完全溶解的。一旦溶解，纤维素可以通过水解和热解迅速发生反应。由于传质限制，水解反应比热解慢，但比超临界水中的分解快，并且已经显示出有效的葡萄糖回收的可能性。一旦溶解，当溶液冷却时保持过饱和，并且也可以通过酶快速水解。木质素也可以通过使用超临界甲酚/水混合物作为溶剂转化为特种化学品。纤维素的溶解还使得生物质能够有效气化。生物质的完全气化已经实现，产生包括氢气、一氧化碳和甲烷的可燃气体。
Supercritical water liquefaction and gasification is reviewed with the introduction of some recent findings by the authors. Supercritical water gasification is suitable for recovery of energy from wet biomass while supercritical water liquefaction opens the door to effective treatment of biomass species in terms of material recovery. Cellulose, one of the main components of biomass, is completely dissolved in supercritical water. Once dissolved, reaction of cellulose can take place swiftly by hydrolysis and pyrolysis. The hydrolysis reaction, otherwise slower than pyrolysis due to the mass transfer limitation, is faster than decomposition in supercritical water, and a possibility of efficient glucose recovery has been shown. Once dissolved, super saturation is kept when the solution is cooled down, and swift hydrolysis by enzyme is also possible. Lignin can be also converted into specialty chemicals by using supercritical cresol/water mixture as a solvent. Dissolution of cellulose also enables efficient gasification of biomass. Complete gasification of biomass has been realized with production of combustible gas including hydrogen, carbon monoxide, and methane.