，并对PODEn合成的反应动力学进行了研究，建立了多步串联的反应动力学模型，通过测量在不同温度下的表观反应速率，得到了PODEn合成反应动力学方程。结果表明：以硫酸为催化剂，在温和条件下反应，催化活性较佳，甲醇的转化率可达90.1%，目标产物PODEn（n 为2～5）的收率可达47.8%；各步串联反应级数均为1，各串联反应的活化能随产物PODEn聚合度的增加依次降低。"/>
Kinetics of Synthesis of Polyoxymethylene Dimethyl Ethers
Kinetics of Synthesis of Polyoxymethylene Dimethyl Ethers
1. College of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;2. Shanghai Research Institute of Petrochemical Technology, SINOPEC, Shanghai 201208, China
Abstract A series of catalysts(sulfuric, HZSM-5 molecular sieve and acidic cation exchange resin) were investigated for the synthesis of polymethoxy dimethyl ethers(PODEn) from methanol(MeOH) and paraformaldehyde(POM) in a bath stirred autoclave. The kinetics model of cascade reactions was established, the apparent reaction rate of PODEn synthesis was measured in a batch stirred reactor using sulfuric acid as catalyst under different temperature to obtain kinetics equation. The results showed that using sulfuric acid as catalyst, the conversion of MeOH was 90.1% and yield of PODEn (n was 2-5)was 47.8% under mild reaction conditions. It was found that the reaction order of each step was one and the activation energy of PODEn synthesis decreased with the increase of the degree of polymerization n based on the kinetics.
