合成聚甲醛二甲醚的反应动力学  

Kinetics of Synthesis of Polyoxymethylene Dimethyl Ethers

作　　者：刘奕[1,2] 高晓晨[2] 高焕新[2] 石竹[2] 李平[1] 

机构地区：[1]华东理工大学化工学院,上海200237 [2]中国石油化工股份有限公司上海石油化工研究院,上海201208

出　　处：《化学反应工程与工艺》2014年第4期365-370,共6页Chemical Reaction Engineering and Technology

基　　金：国家重点基础研究发展计划项目(2009CB623500)

摘　　要：考察了几种催化剂（硫酸，HZSM-5分子筛，酸性阳离子交换树脂）在甲醇（MeOH）和多聚甲醛（POM）制备聚甲醛二甲醚（PODEn）反应中的催化活性，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。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 polymerizationn based on the kinetics.

关 键 词：聚甲醛二甲醚 甲醇 多聚甲醛 动力学 

分 类 号：O631.5[理学—高分子化学]