Abstract：In order to study the reaction progress for the synthesis of polymethoxy dimethyl ethers (PODEn) 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 1stOpt software to get the chemical equilibrium constants for the synthesis of PODEn. 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 PODEn 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 PODEn and can provide theoretical support for the design of industrial reactor.
He Gaoyin,Shi Midong,Dai Fangfang et al. Reaction Kinetics of the Synthesis of Polymethoxy Dimethyl Ethers from Methanol and Formaldehyde[J]. 化学反应工程与工艺, 2016, 32(5): 438-444.
