摘要
研究了在1-丁基-3-甲基咪唑阳离子与咪唑阴离子搭配的碱性[Bmim]Im离子液体催化作用下,碳酸二甲酯(DMC)与异辛醇(EHOH)通过两步酯交换法制备碳酸二异辛酯(DEHC)的合成工艺。确定了合成DEHC的最佳反应条件为:催化剂用量为原料总质量的2.0%,醇酯摩尔比为4∶1,一步反应温度90℃,反应时间2 h,二步反应温度120℃,反应时间4 h,经减压蒸馏可得到DEHC的收率为66.15%,纯度>99%。使用红外光谱1、H核磁共振谱对DEHC的结构进行了表征。实验结果表明,[Bmim]Im碱性离子液体可作为均相催化剂催化酯交换反应,在双酯合成工艺中具有潜在的应用价值。
Di-2-ethy hexyl carbonate（DEHC） was prepared by transesterifying dimethyl carbonate（DMC） with 2-ethylhexanol（EHOH） in the presense of [Bmim]Im（paired by 1-butyl-3-methylimidazolium cation and imidazolide anion） as a catalyst.The optimum process condition was as follows： the catalyst amounts was 2.0%,molar ratio of 2-ethylhexanol to DMC was 4∶1,the reaction temperature and time of the 1st step is 90 ℃ and 2 h respectively,the reaction temperature and time of the 2nd step is 120 ℃ and 4 h,in that the yield of DEHC is 66.15%.The gas chromatography shows that the purity of DEHC is above 99%.The structure of DEHC was characterized using FTIR and 1H NMR.Our experiments demonstrated that,by taking [Bmim]Im as catalyst,this technology should be a valuable and broadening routine for similar transesterifying reactions.
出处
《大连工业大学学报》
CAS
北大核心
2011年第2期129-132,共4页
Journal of Dalian Polytechnic University
基金
辽宁省教育厅创新团队项目(2008T011)
关键词
碱性离子液体
碳酸二异辛酯
碳酸二甲酯
离子液体催化
酯交换反应
alkaline ionic liquid
di-2-ethy hexyl carbonate
dimethyl carbonate
ionic liquid catalysis reaction
transesterification
