本文關鍵詞： 六羥甲基三聚氰胺 六甲氧基甲基三聚氰胺 醚化反應 動力學　出處：《高校化學工程學報》2016年06期 　論文類型：期刊論文

【摘要】：在硝酸催化下進行六羥甲基三聚氰胺(HMM)與甲醇的甲醚化反應,生成了六甲氧基甲基三聚氰胺(HMMM)�？疾炝朔磻^程中甲醇濃度的變化,提出了HMM甲醚化反應的機理并建立了動力學模型。通過實驗數據擬合出醚化動力學參數,分析了不同反應溫度下醚化度-時間關系。結果表明,該反應是典型的可逆平衡反應,pH=3.5下,當溫度由30℃升高至55℃時,甲醚化反應平衡常數由1.17增大至2.79。甲醚化正逆反應速率常數與溫度的關系分別為k1=8.54×10~6×exp(-5.39×10~4/RT)與k2=257×exp(-2.79×10~4/RT)。根據van't Hoff方程計算了該甲醚化反應表觀反應焓為25.97 k J×mol~(-1),表觀反應熵為86.5 J×(mol·K)~(-1)。
[Abstract]:The methoxymethyl melamine (HMMM) reaction with methanol was carried out under the catalysis of nitric acid. The change of methanol concentration during the reaction was investigated. The mechanism of HMM methyl ether reaction was put forward and the kinetic model was established. The etherification kinetic parameters were fitted by experimental data, and the relationship between etherification degree and time at different reaction temperature was analyzed. The reaction is a typical reversible equilibrium reaction at pH 3.5. When the temperature is raised from 30 鈩，

本文編號：1497671