甲醇和甲醛合成聚甲氧基二甲醚的动力学研究

发布时间：2018-11-26 13:12

【摘要】：为研究分子筛催化甲醇与甲醛反应合成聚甲氧基二甲醚(PODE_n)的反应过程特点,在均相实验装置中,考察了不同温度和不同原料配比下该反应的化学平衡特性和动力学特性。实验采用1st Opt软件中拟牛顿-全局优化算法计算出混合溶液中单体甲醛、甲醇和水的真实含量,进一步得到合成PODE_n的平衡常数。计算结果表明,实验条件下的混合溶液中单体甲醛摩尔分率数量级为10~(-3) mol/mol,即溶液中单体甲醛含量极低。通过范特霍夫方程,合成PODE_n反应的反应焓分别为-34.24 k J/mol(n=2)、-27.12 k J/mol(n≥3),即合成PODE_n的反应为微放热反应。拟均相催化反应动力学模型能很好地反映PODE_n的生成过程,为工业上反应器的设计提供理论支持。
[Abstract]:In order to study the characteristics of the synthesis of polymethoxydimethyl ether (PODE_n) from methanol and formaldehyde catalyzed by molecular sieve, a homogeneous experimental device was developed. The chemical equilibrium and kinetic characteristics of the reaction were investigated at different temperatures and different feedstock ratios. By using the quasi-Newton-global optimization algorithm in 1st Opt software, the real content of formaldehyde, methanol and water in mixed solution is calculated, and the equilibrium constant of synthetic PODE_n is obtained. The results show that the molar fraction of monomer formaldehyde in mixed solution is 10 ~ (-3) mol/mol, that is, the content of monomer formaldehyde in solution is very low. The enthalpy of synthesis of PODE_n is -34.24 k J/mol (n ~ 2) and -27.12 k J/mol (n 鈮，

本文编号：2358657