在水/CO2 体系中增强机械预处理纤维素的水解。
Enhanced hydrolysis of mechanically pretreated cellulose in water/CO system.
机构信息
Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610207, China.
School of Chemical Engineering, Sichuan University, Chengdu 610065, China.
出版信息
Bioresour Technol. 2018 Aug;261:28-35. doi: 10.1016/j.biortech.2018.03.098. Epub 2018 Mar 31.
The aim of this work was to study promotion of ball milling and CO assistance on cellulose hydrolysis kinetics in water medium. Kinetic behaviors were analyzed based on first-order and shrinking core models. The results showed that cellulose hydrolysis is enhanced by ball milling and CO assistance. Ball milling reduced crystallinity and particle size of cellulose, resulting in high cellulose conversion, while hydrolysis promoted by CO assistance was weaker. Double-layer hydrolysis was observed for ball-milled cellulose, and rate constant in active layer is higher. Based on double-layer shrinking core model (DL-SCM), activation energy of cellulose conversion decreased from 73.6 to 39.8 kJ/mol when ball milling and CO assistance were applied. Hydrolysis active layer was about 0.9 μm, representing activated thickness of ball-milled cellulose. Hydrolysis promotion by crystallinity and particle size reduction was distinguished via DL-SCM, and crystal evolution possesses greater improvement than particle size decrease on hydrolysis of ball-milled cellulose.
本工作旨在研究球磨和 CO 辅助对纤维素在水介质中水解动力学的促进作用。基于一级和收缩核模型分析了动力学行为。结果表明，球磨和 CO 辅助均能增强纤维素的水解。球磨降低了纤维素的结晶度和粒径，导致纤维素转化率高，而 CO 辅助促进的水解较弱。对于球磨纤维素，观察到双层水解，活性层中的速率常数较高。基于双层收缩核模型（DL-SCM），当同时使用球磨和 CO 辅助时，纤维素转化的活化能从 73.6 kJ/mol 降低到 39.8 kJ/mol。水解活性层约为 0.9 µm，代表球磨纤维素的活化厚度。通过 DL-SCM 区分了结晶度和粒径减小对水解的促进作用，晶体演变对球磨纤维素水解的促进作用大于粒径减小。
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