Dissolution reaction kinetics and mass transfer during aqueous choline chloride pre-treatment of oak wood
Dissolution reaction kinetics and mass transfer during aqueous choline chloride pre-treatment of oak wood
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DOI：
10.1016/j.biortech.2020.124519
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发表时间：
2021-02-01
影响因子：
11.4
通讯作者：
Shah, Kalpit
中科院分区：
文献类型：
--
作者：
Halder, Pobitra;Patel, Savankumar;Shah, Kalpit
采用离子液体的木质纤维素生物质加工是生物精炼工业的最近研究兴趣。生物质在离子液体中的溶解动力学数据对于设计放大的预处理反应器设计是重要的。本文研究了柞木在氯化胆碱溶液中的溶解反应机理和动力学。在一个扩展的努力，无因次数的关联式开发的估计的传质系数。分析表明，柞木在氯化胆碱中的溶解分两个阶段进行。在第一阶段的溶解过程中，离子液体通过产物层的扩散是主要的速率控制步骤，第二阶段是表面化学反应。氯化胆碱在橡木中的扩散系数在2.96E-14 ~ 2.84E-13 m（2）/s之间。扩散控制阶段和表面化学反应控制阶段的活化能分别为24.2和40.3kJ mol（-1）。提出的传质系数数学关联式与实验值吻合较好。
Lignocellulosic biomass processing employing ionic liquids is of recent research interest for the biorefinery industry. The data on biomass dissolution kinetics in ionic liquids is important for designing scale-up pre-treatment reactor design. In this study, the reaction mechanism and kinetics of oak wood dissolution in aqueous choline chloride was investigated. In an extended effort, a correlation of dimensionless numbers was developed for the estimation the mass transfer coefficient. The analyses suggested that oak wood dissolution in choline chloride occurred in two stages. The diffusion of ionic liquid through the product layer was the dominating rate-controlling step in the first stage of dissolution followed by the surface chemical reaction in the second stage. The diffusivity of choline chloride into the oak wood matrix was ranging between 2.96E-14 and 2.84E-13 m(2)/s. The activation energy of the diffusion controlled stage and surface chemical reaction controlled stage was approximately 24.2 and 40.3 kJ mol(-1), respectively. The proposed mathematical correlation for mass transfer coefficient fitted well with the experimental mass transfer coefficient values.