Chemical equilibrium controlled synthesis of polyoxymethylene dimethyl ethers over sulfated titania  

作　　者：Huaju Li Huanling Song Feng Zhao Liwei Chen Chungu Xia 

机构地区：[1]Laboratory for Nano-Catalytic Material & Technology, Division of Advanced Nano?materials, Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences [2]State Key Laboratory for Oxo Synthesis and Selective Oxidation,Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences [3]i-Lab, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences

出　　处：《Journal of Energy Chemistry》2015年第2期239-244,共6页能源化学（英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC,No.21203220 and 21133011);China Postdoctoral Science Foundation(No.2014M551674);Jiangsu Planned Projects for Postdoctoral Research Funds(No.1302070C);the National Basic Research Program of China(973 Program,No.2011CB201404)

摘　　要：The chemical equilibrium and reaction kinetic behavior in the synthesis of polyoxymethylene dimethyl ethers （DMMn） were investigated over sulfated titania in order to reveal the decisive factor controlling the reaction. The results showed that the molar ratio of adjacent DMMn products in equilibrium solution had the same value, which depended absolutely on the reaction temperature. Meanwhile, the reactions had the same DMMn products distributions under varied reaction conditions. The equilibrium constants of the related step-wise reactions for DMMn formation were equal, which were calculated based on the bulk compositions of the reaction solution. And thus, the selectivity to DMMn was mainly controlled by the chemical equilibrium, i.e., thermodynamic control. In brief, the present results provide some guidance for future synthesis of DMMn.The chemical equilibrium and reaction kinetic behavior in the synthesis of polyoxymethylene dimethyl ethers （DMMn） were investigated over sulfated titania in order to reveal the decisive factor controlling the reaction. The results showed that the molar ratio of adjacent DMMn products in equilibrium solution had the same value, which depended absolutely on the reaction temperature. Meanwhile, the reactions had the same DMMn products distributions under varied reaction conditions. The equilibrium constants of the related step-wise reactions for DMMn formation were equal, which were calculated based on the bulk compositions of the reaction solution. And thus, the selectivity to DMMn was mainly controlled by the chemical equilibrium, i.e., thermodynamic control. In brief, the present results provide some guidance for future synthesis of DMMn.

关 键 词：polyoxymethylene dimethyl ethers sulfated titania chemical equilibrium reaction kinetic molar ratio 

分 类 号：O632.32[理学—高分子化学]