Hydrogen bonding-catalysed alcoholysis of propylene oxide at room temperature
作者:Yueting Xu、Yanfei Zhao、Fengtao Zhang、Yuepeng Wang、Ruipeng Li、Junfeng Xiang、Zhimin Liu
DOI:10.1039/d1cc03602e
日期:——
Alcoholysis of propylene oxide (PO) is achieved over azolate ionic liquids (IL, e.g., 1-hydroxyethyl-3-methyl imidazolium imidazolate) at roomtemperature, accessing glycol ethers in high yields with excellent selectivity (e.g., >99%). Mechanism investigation indicates that cooperation of hydrogen-bonding of the anion with methanol and that of the cation with PO catalyses the reaction.
环氧丙烷(PO)的醇解是在室温下在唑盐离子液体(IL,例如,1-羟乙基-3-甲基咪唑鎓咪唑盐)上实现的,以高产率和优异的选择性(例如,>99%)获得乙二醇醚。机理研究表明,阴离子与甲醇的氢键和阳离子与 PO 的氢键共同催化了反应。
Three different types of heterocycle of nitrogen-containing alkaline ionic liquids treatment of acid oil to remove naphthenic acids
作者:Jiyun Duan、Yu Sun、Li Shi
DOI:10.1016/j.cattod.2012.07.023
日期:2013.9
Ionic liquids had enormous potential for industrial use as environmental friendly chemicals. A green and effective deacidification method was found based on ionic liquids. N-alkylpyridinium bromide ([APy]Br), 1-alkyl-3-methylimidazolium bromide ([AMIm]Br) and 1-alkyl-3-methylimidazolium imidazolide ([AMIm]Im) were used to remove naphthenic acids from acid oil. The performance of deacidification followed the order [APy]Br < [AMIm]Br < [AMIm]Im. The stronger alkalinity of ionic liquids was, the higher deacidification would be. The growth of alkyl chain length was also beneficial to get high deacidification. The deacidification mechanism was that liquid clathrate could form due to interaction between the ionic liquids and pi-bond in naphthenic acids through pi-pi interaction. When the reagent/oil ratio of [OMIm]Im (1-octyl-3-methylimidazolium imidazolide)/oil was 0.008, the deacidification rate could be reached 100%. The preliminary results reveal that the process consumes less energy, saves time and produces less pollution to environment. (C) 2012 Elsevier B.V. All rights reserved.