Kinetic Study on the Decomposition of Cellulose to 5-Hydroxymethylfurfural in an Ionic Liquid/Organic Biphasic System
The kinetics of cellulose decomposition in an ionic liquid/organic solvent was investigated using microcrystalline cellulose as a raw material under the following conditions:temperature,110 ℃ to 130 ℃;amount of catalyst,0.5%to 2%; mass ratio of1-butyl-3-methylimidazolium chloride(BMIMCl)to microcrystalline cellulose,5:1 to 15:1;and mass ratio ofBMIMCl to organic solvent,1:1.7 to 1:5.4.Curve fitting of the cellulose degradation kinetics data was conducted using MATLAB.Results indicated that the catalytic decomposition reactions of cellulose,glucose,and 5-HMF,as well as the phase transfer of 5-HMF,were all first-order reactions in the biphasic system.The decomposition rate constants of cellulose,glucose,and 5-HMF,as well as the transfer coefficient of5-HMF(k5),in the biphasic system were obtained using the first-order reaction model.The organic solvent could suppress the formation of by-products to a certain extent.The organic solvent also reduced the activation energy of cellulose,glucose and 5-HMF degradation by4.24%,5.17%and 3.73%,respectively,compared with cellulose degradation in ionic liquid.The amount of organic solvent had little effect on glucose yield within the optimum reaction time and did not ascertain the presence of glucose in the organic solvent.k5 was relatively small and increased with increased temperature,reaction time,and amounts ofBMIMCl,catalyst and organic solvent,with temperature having the greatest effect.The equation for the parameter k5was as follows:C5-HMF2=k1k2k5Cc0-e-k1t/k1(kg-k1)(k4+k5-k1)+e-kgt/kg(kg-k1)(k4+k5-kg)-e-(k4+k5)t/(k4+k5)(k4+k5-kg)(k4+k5-k1)
5-HMF Ionic liquid Biphasic system Kinetics
Suxiang Li Lei Xu Zhe Wang Heng Zhang
College of Chemical Engineering,Qingdao University of Science & Technology,Qingdao,Shandong,266042,C College of Chemical Engineering,Qingdao University of Science & Technology,Qingdao,Shandong,266042,C
国际会议
第五届制浆造纸新技术国际研讨会(ISETPP)暨第三届国际造纸与环境学术大会(IPEC)
广州
英文
1-4
2016-11-07（万方平台首次上网日期，不代表论文的发表时间）