高校化学工程学报2016，Vol.30Issue(6)：1306-1312,7.DOI:10.3969/j.issn.1003-9015.2016.06.010
六羟甲基三聚氰胺的甲醚化反应机理分析及动力学研究
Mechanism and Kinetics of Hexamethylolmelamine Methyl Etherification
颜小东 1孙巧路 1杨凯 1范宏 1李伯耿1
作者信息
- 1. 化学工程联合国家重点实验室 浙江大学，浙江大学 化学工程与生物工程学院，浙江 杭州310027
- 折叠
摘要
Abstract
Hexamethoxymethyl melamine (HMMM) was synthesized through etherification of hexamethylolmelamine (HMM) with methanol using nitric acid as a catalyst. Changes of methanol concentration were determined to study the etherification process, and a kinetic model was established based on the proposed etherification mechanism. The kinetic parameters were obtained via experimental data fitting. The relationship between degree of etherification (DoE) and reaction time under different temperatures was analyzed. The results show that the etherification process is a typical reversible equilibrium reaction. The equilibrium constant of etherification increases from 1.17 to 2.79 when the temperature increases from 30℃ to 55℃ at pH 3.5. The variation of forward and reverse reaction rate constants on reaction temperature were obtained as follows: k1=8.54×106×exp(-5.39×104/RT), k2=257×exp(-2.79×104/RT). According to van 't Hoff equation, the apparent reaction enthalpy and reaction entropy for etherification are 25.97 kJ×mol-1 and 86.5 J×(mol×K)-1, respectively.关键词
六羟甲基三聚氰胺/六甲氧基甲基三聚氰胺/醚化反应/动力学Key words
hexamethylolmelamine/hexamethoxymethyl melamine/etherification/kinetics分类
化学化工引用本文复制引用
颜小东,孙巧路,杨凯,范宏,李伯耿..六羟甲基三聚氰胺的甲醚化反应机理分析及动力学研究[J].高校化学工程学报,2016,30(6):1306-1312,7.
