2-甲基-1,3-丙二醇水溶液密度和粘度的测定及关联  

Densities and Viscosities of 2-Methyl-1,3-Propylene Glycol + H_2O System at Different Temperatures and Different Compositions

作　　者：李惠萍[1] 王红梅[1] 蒋登高[1] 刘权[1] 吴鲲[1] 

机构地区：[1]郑州大学化工学院精细有机化工研究所,河南郑州450002

出　　处：《高校化学工程学报》2006年第4期638-642,共5页Journal of Chemical Engineering of Chinese Universities

基　　金：河南省自然科学基金(511021100)。

摘　　要：常压下采用密度瓶测定了纯液体2-甲基-1,3-丙二醇（MPO）及不同浓度的MPO＋水二元体系在298．15-367．15K范围的密度；用乌氏粘度计测定了纯液体MPO及该二元体系在相应温度下的粘度。结果表明：MPO及其水溶液的密度和粘度均随温度升高而减小，密度呈线性衰减，粘度呈指数衰减；一定温度下MPO＋水二元体系的密度随浓度变化大约在70％处出现了一极大值。同时分别由密度和粘度实验数据计算了不同温度及组成下该二元体系的超额摩尔体积V^E和混合粘度变化△η，结果V^E和△η均为负值，说明产生了负偏差。并由实验数据拟合出Grunberg-Nissan模型中的MPO-水体系的二元交互参数△gη，它与温度和组成均有关。Under the atmospheric pressure and by using the Ostwald-Sprengel-type pycnometer and the Ubbelohde capillary viscometer, the densities and viscosities of the binary system, 2-methyl-1,3-propylene glycol （MPO） ＋ H2O, were measured at the temperature range of 298.15-367.15K and over the whole MPO molar fraction range. The experimental results show that under a given composition, both the densities and viscosities decrease with increasing temperature, and the densities decrease linearly while the viscosities decrease exponentially with the increase of the temperature, Under a given temperature, the density changes with changing MPO concentration and there is a maximum value of density at MPO concentration of about 70% The experimental data of densities and viscosities were also used to determine the excess molar volumes V^E and the viscosity varitics △η, respectively, and both the values of V^E and △η obtained arc negative over the whole composition range. The binary mutual parameter △Gη of Grunberg-Nissan model was obtained by regressing the experimental data and it shows that the △Gij varies with the temperature and thc composition of the binary system.

关 键 词：2-甲基-1 3-丙二醇(MPO) 密度 粘度 超额体积 混合粘度变化 

分 类 号：O623.413[理学—有机化学]