Efficient synthesis of poly(oxymethylene) dimethyl ethers over PVP-stabilized heteropolyacids through self-assembly

被引：31
|
作者：
Fang, Xiaolong [1 ]
Chen, Jin [1 ]
Ye, Linmin [1 ]
Lin, Haiqiang [1 ]
Yuan, Youzhu [1 ]
机构：
[1] Xiamen Univ, Coll Chem & Chem Engn, State Key Lab Phys Chem Solid Surfaces, Natl Engn Lab Green Chem Prod Alcohols Ethers & E, Xiamen 361005, Peoples R China
来源：
SCIENCE CHINA-CHEMISTRY | 2015年 / 58卷 / 01期
基金：
中国国家自然科学基金;
关键词：
poly(oxymethylene) dimethyl ethers; methanol; trioxane; heteropolyacids; polyvinylpyrrolidone; CATALYST; PERFORMANCE;
D O I：
10.1007/s11426-014-5257-x
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A series of polyvinylpyrrolidone-stabilized heteropolyacids (PVP-HPAs) are generated by self-assembly of HPAs and PVP in methanol. The PVP-HPAs are then employed as catalysts for the synthesis of poly(oxymethylene) dimethyl ethers (DMM (n) , na (c) 3/41) by the methanolysis of trioxane. The results suggest that the acidity of PVP-HPAs is tunable by changing the ratio of PVP and HPAs, which is a key factor for the selectivity of the DMM (n) product. By optimizing the composition and reaction conditions, two types of PVP-HPA, PVP-phosphotungstic acid (PVP-HPW) in a PVP/HPW ratio of 1/4:1 and PVP-silicotungstic acid (PVP-HSiW) in a PVP/HSiW ratio of 1/4:3/4, respectively afford 52.4% and 50.3% yields of DMM2-5. The optimized catalysts are reusable for a minimum of 10 times without a significant drop in performance.
引用
收藏
页码：131 / 138
页数：8
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