摘要
制备了4种双磺酸丙基咪唑离子液体,用NMR表征了离子液体的结构,并通过Hammett法研究了离子液体的酸度。考察了离子液体催化甲醇和三聚甲醛合成聚甲醛二甲醚(PODEn)的催化活性,通过单因素实验确定了最佳反应条件:反应时间为2 h、反应温度为110℃、催化剂质量分数为2%、n(甲醇)∶n(三聚甲醛)为2∶1。此时,三聚甲醛的转化率和PODE3~5的选择性分别为96.91%和56.67%。研究表明,双磺酸离子液体的催化活性明显高于单磺酸离子液体,在催化合成PODEn中更具有优势。
Four kinds of propyl imidazole disulfonate ionic liquids are synthesized,their structures are characterized by NMR spectrometer,and their acidities are determined by UV-Vis spectra.Their catalytic activities are evaluated in the synthesis of polyoxymethylene dimethyl ether(PODE_n)from methanol and trioxane.The optimal reaction conditions are determined through single factor experiments as follows:reaction time is 2 h,reaction temperature is at 110℃,mass fraction of catalyst is 2 wt%,and n(methanol)∶n(trioxane)=2.Under these conditions,the conversion of trioxane and the selectivity to the targeted PODE3-5 products are as high as 96.91%and 56.67%,respectively.Study shows that the catalytic activity of bis-sulfonic acid ionic liquids is significantly higher than that of sulfonic acid ionic liquid,which owns more advantageous in the catalytic synthesis of PODE_n.
作者
张静
张昊昱
黄双平
张朝峰
李瑞丰
ZHANG Jing;ZHANG Hao-yu;HUANG Shuang-ping;ZHANG Chao-feng;LI Rui-feng(College of Biomedical Engineering,Taiyuan University of Technology,Taiyuan 030024,China;College of Chemistry and Chemical Engineering,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《现代化工》
CAS
CSCD
北大核心
2020年第11期169-172,177,共5页
Modern Chemical Industry
基金
山西省自然科学基金(201801D121062)
山西省回国留学人员科研资助项目(2017-037)
太原理工大学校基金(2016MS03)。
关键词
聚甲醛二甲基醚
离子液体
三聚甲醛
甲醇
polyoxymethylene dimethyl ethers
ionic liquids
trioxane
methanol
