[BMim][HSO_4]-H_2SO_4二组分物系密度的测定及相关热力学性质的研究  

Density and thermodynamic properties of binary [BMim][HSO_4]-H_2SO_4 system

作　　者：张帅[1] 张涛[1] 唐盛伟[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065

出　　处：《石油化工》2016年第8期957-965,共9页Petrochemical Technology

基　　金：国家自然科学基金项目(21276163;21576168)

摘　　要：在常压和283.15~313.15 K的温度范围内,测定了离子液体1-丁基-3-甲基咪唑硫酸氢盐([BMim][HSO_4])与H_2SO_4二组分物系在全浓度范围内的密度,由密度数据计算了不同温度和浓度下混合物的超额摩尔体积(VE)和各组分的偏摩尔体积,基于半经验Zhang方程和NMSRK状态方程建立了二组分物系密度的预测模型。实验结果表明,两种模型的计算值与实验值具有较高的符合度,其平均绝对误差均不超过0.30%;在全浓度范围内二组分物系的VE均为正值,当x_(H_2SO_4)=0.60时,物系的VE达到最大,最大值为2.462 80 cm^3/mol(313.15 K);二组分物系中[BMim][HSO_4]的偏摩尔体积随x_(H_2SO_4)的增大而增大,H_2SO_4的偏摩尔体积随x_(H_2SO_4)的增大而减小。Under the conditions of ambient pressure and 283.15-313.15 K, the density of binary [BMim] [HSO4]-H2SO4 systems with the molar fraction of H2SO4 of 0-1 was measured. Based on the obtained density data, the excess molar volume of the systems and the partial molar volumes of the two components at different temperature were calculated. The models for predicting the density of the binary systems were established by means of the semi-empirical Zhang model and NMSRK equation of state separately. It was showed that, the two models predict the density of the binary systems well with an average deviation of less than 0.30%. The excess molar volumes of all the measured binary systems were greater than zero and the maximum value of 2.462 80 cm^3/mol was obtained under the conditions of molar fracton of H2SO4 0.60 and 313.15 K. In the binary systems, with increasing the molar fraction of H2SO4, the partial molar volume of [BMim] [HSO4 ] increased while the partial molar volume of H2SO4 decreased.

关 键 词：离子液体 硫酸 二组分物系 密度 热力学性质 

分 类 号：TQ013.1[化学工程]