Kinetic study of retro‐aldol condensation of glucose to glycolaldehyde with ammonium metatungstate as the catalyst
Kinetic study of retro‐aldol condensation of glucose to glycolaldehyde with ammonium metatungstate as the catalyst
复制标题
DOI：
10.1002/aic.14554
复制
发表时间：
2014-11
期刊：
影响因子：
3.7
通讯作者：
Junying Zhang;B. Hou;Aiqin Wang;Zhenlei Li;Hua Wang;Tao Zhang
中科院分区：
文献类型：
--
作者：
Junying Zhang;B. Hou;Aiqin Wang;Zhenlei Li;Hua Wang;Tao Zhang
在间歇反应器中，以偏钨酸铵(AMT)为催化剂，在423~453K温度范围内，研究了葡萄糖逆-羟醛缩合反应动力学。考虑了三个连续的反应：葡萄糖的逆羟醛缩合成红色素和乙醇醛(R1)，红色素的逆羟醛缩合成两个摩尔的乙醇醛(R2)，以及乙醇醛进一步转化成副产物(R3)。实验数据的拟合表明，R1为一级反应，R2和R3分别为1.7级和2.5级反应。反之，反应速率与AMT催化剂的浓度呈0.257级关系。R_1、R_2和R_3的表观活化能分别为141.3、79.9和52.7kJ/m o l。较高的活化能表明高温有利于乙醇醛的形成。动力学模型较好地预测了不同温度和初始葡萄糖浓度下的实验c-t曲线。(C)2014年美国化学工程师学会
The kinetics of the retro-aldol condensation of glucose to glycolaldehyde was studied in a batch reactor at 423-453 k using ammonium metatungstate (amt) as the catalyst. three consecutive reactions were considered: retro-aldol condensation of glucose to erythrose and glycolaldehyde (r1), retro-aldol condensation of erythrose to two moles of glycolaldehyde (r2), and further conversion of glycolaldehyde to side products (r3). fitting of the experimental data showed that r1 was first-order reaction while r2 and r3 were 1.7th- and 2.5th-order reaction, respectively. conversely, the reaction rate of r1 was 0.257th-order dependence on the concentration of amt catalyst. the apparent activation energies for r1, r2, and r3 were 141.3, 79.9, and 52.7 kj/mol, respectively. the high activation energy of r1 suggests that a high temperature is favorable to the formation of glycolaldehyde. the experimental c-t curves at different temperatures and initial glucose concentrations were well predicted by the kinetic model. (c) 2014 american institute of chemical engineers