【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。更多还原

【Abstract】 In order to study the reaction progress for the synthesis of polymethoxy dimethyl ethers（PODE_n） from methanol and formaldehyde, the chemical equilibrium characteristics and the kinetics of the reaction were investigated in a homogeneous experimental setup under different temperatures and feed ratios using zeolite as the catalyst. The real mole fraction of monomeric formaldehyde, methanol and water in the mixed solution was calculated with pseudo-Newton-global optimization algorithm using 1st Opt software to get the chemical equilibrium constants for the synthesis of PODE_n. The results showed that the calculated mole fraction of monomeric formaldehyde in the mixed solution was in the order of 10^-3 mol/mol, namely monomeric formaldehyde in aqueous solutions was very low and almost negligible. The reaction enthalpies of the synthesis of PODE_n was-30.24（n = 2） and-27.12 KJ/mol（n ≥ 3） respectively by van’t Hoff equation, implying the reaction was slightly exothermic. The kinetic model of the pseudo-homogeneous catalytic reaction can well reflect the formation process of PODE_n and can provide theoretical support for the design of industrial reactor.更多还原