水-环己烷-乙醇体系的液液平衡研究  

Liquid-Liquid Equilibrium of the Water-Cyclohexane-Ethanol System

作　　者：居红芳[1] 徐桦[1] 邵艳芳[1] 殷文宇[1] 

机构地区：[1]常熟理工学院化学系,江苏常熟215500

出　　处：《高校化学工程学报》2006年第4期643-647,共5页Journal of Chemical Engineering of Chinese Universities

摘　　要：用GC-14B气相色谱仪测定了水-环己烷-乙醇体系在298.15K、308.15K、318.15K和328.15K的等温截面相图。所用方法是内标法,内标物为乙酸乙酯,溶剂正丁醇。实验测定了除水以外各组分的保留时间和相对校正因子,相对校正因子的实验值与文献值很接近。在单相区域,对实验准确度进行了验证,均方根实验误差1.51%。给出了四个等温截面的两相平衡实验数据和相应的示意图。其相图特征与水-正己烷-甲醇体系相仿;当醇浓度不大时,存在较大的水相、油相共存区域;醇浓度较大时为单相区域。但在水-环己烷-乙醇体系中,单相区域随温度增加明显增大。Under normal pressure, the isothermal LLE data of water-cyclohexane-ethanol （H2O-C6H12-C2H5OH） system at 298.15K, 308.15K, 318.15K and 328.15K were measured, respectively, by using the gas chromatograph method. The inner-scaling method was used to determine the concentration of C6H12 and C2H5OH in this ternary system. During which, the n-butyl alcohol （n-C4H9OH） was chosen as the diluent and ethyl acetate （CH3COOC2H5） was chosen as the inner-scaling substance because of its separability and its fit retaining time. The retaining time of C6H12, CH3COOC2H5, C2H5OH and n-C4HgOH are 1.771 min, 2.550 min, 3.035 min and 5.499 rain, respectively, and the relative correcting factors of C6H12 and C2H5OH are 0.533 and 0.837. The measured LLE data at four given tempcratures mentioned above and their corresponding isothermal section diagrams were given. It shows that the isothermal section diagrams of H2O-C6H12-C2H5OH system are similar to those of the H2O-n- C6H14-CH3OH system, that is, when the alcohol concentration is low, there exists a large co-exist area of water-oil two phase, and when the alcohol concentration is high, there exists only a single phase area However, for the H2O-C6H12-C2H5OH system, the single phase area increases dramatically with increasing temperature.

关 键 词：水-环己烷-乙醇 液液平衡 气相色谱 内标法 

分 类 号：O657[理学—分析化学]