离子液体/硫酸混合物的Hammett值测定方法  

A method for determination of Hammett acidity function(H_0) of ionic liquid/sulfuric acid binary mixtures

作　　者：周飞[1] 张圆[1] 张涛[1] 梁斌[1] 唐盛伟[1] 

机构地区：[1]四川大学化学工程学院四川省多相流传质与反应工程重点实验室,四川成都610065

出　　处：《天然气化工—C1化学与化工》2013年第6期87-91,共5页Natural Gas Chemical Industry

基　　金：国家自然科学基金资助项目(21276163)

摘　　要：通过对Hammett酸度法的测量原理的分析、指示剂及全碱型和质子化介质的合理选择,建立了针对离子液体/硫酸二元混合物的酸强度测定方法。以2-苯酰萘、2,4-二硝基-6-溴苯胺、蒽醌和4-硝基甲苯为指示剂测定不同范围的H0。通过比较硫酸溶液的H0的实验值和文献值评估了该方法的可靠性,相对偏差小于0.5%。采用该方法测定了1-己基-3-甲基咪唑硫酸氢盐([HMIm][HSO4])/硫酸和3-甲基-1-(4-丁磺酸基)咪唑硫酸氢盐([MBSIm][HSO4])/硫酸两类离子液体/硫酸混合物的H0值,3次测量的平均相对偏差小于0.3%。A method for determining the Hammett acidity function （H0） of ionic liquid/H2O4 binary mixtmes was established by analyzing the measuring principal and choosing the suitable media for protonating or unprotonating the indicato. 2- benzoylnaphthalene, 6-bromo-2,4-dinitroaniline, anthraquinone and 4-nitrotoIuene were used as indicators for different scopes of H0. The reliability of this method was evaluated by comparing the experimental H0 and the literature Ho of H_,S04 solution, and the relative deviation was less than 0.5%. The method was successfully used to determine the Ho of the （[HMIm][HSO4]）/H2S04 with a IL mass fraction of up to 19% and the （[MBSIm][HSO4]）/H.,SO4 with a IL mass fraction of up to 15%. The relative deviation of three parallel measurements was less than 0.3%.

关 键 词：Hammett酸度法㈣ 离子液体 硫酸 1-己基-3-甲基咪唑硫酸氢盐 3-甲基 1-(4-丁磺酸基)咪唑硫酸氢盐 

分 类 号：O65[理学—分析化学]