1,2-丙二醇水溶液在不同温度下的超额摩尔体积黏度和热容

Experimental densities, viscosities and heat capacities at different temperatures were presented over the entire mole fraction range for the binary mixture of 1,2-propanediol and water. Density values were used in the determination of excess molar volumes, VE. At the same time, the excess viscosity was investigated. The values of VE and E were fitted to the Redlich-Kister equation. Good agreement was observed. The excess volumes are negative over the entire range of composition. They show an U-shaped-concentration dependence and decrease in absolute values with increase of temperature. Values of E are negative over the entire range of the composition, and has a trend very similar to that of VE . The analysis shows that at any temperature the specific heat of mixture is a linear function of the composition as x1 > 20%. All the extended lines intersect at one point. An empirical equation is obtained to calculate the specific heat to mixture at any composition and temperature in the experimental range.     

若干液体混合物的粘度和密度测定

本文用比重管和毛细管粘度计测定了乙酸乙酯-四氯化碳-环己烷-苯、甲醇-乙醇-异丙醇-四氯化碳、水-甲醇-乙醇-异丙醇、水-甲醇-丙酮-醋酸四个四元体系及包含的二元、三元体系在298.15K的密度和粘度。     

液体混合物密度和粘度的实验测定

<正> 本文分别在四个温度下,对乙酸乙酯+正己烷、氯仿+正己烷、四氯化碳+丙酮、乙酸乙酯+丙酮、四氯化碳+甲苯、氯苯+甲苯这6个二元液体混合物的密度和粘度进行了实验测定。包括纯物质在内,总的实验点数为244点。混合物均是涉及极性组分的系统。 根据所测二元系具有易挥发的特点,采用特别加工的密度瓶和乌氏(Ubbelohde)粘度计。     

含非对称Gemini离子液体二元混合体系的体积和黏度性质

在温度分别为293.15、303.15、313.15、323.15和333.15 K及大气压下,系统测定了非对称Gemini离子液体,1-(3-(三甲基铵)丙-1-基)-3-甲基咪唑双氰胺盐([N₁₁₁C₃MIM][N(CN)₂]₂),分别与乙腈(MeCN)、甲醇(MeOH)、乙醇(EtOH)所组成的二元混合物的密度和黏度。由密度和黏度值分别计算了二元混合物的超额摩尔体积(V_{\mathrm{m}}^{\mathrm{E}})和超额黏度(Δη)。V_{\mathrm{m}}^{\mathrm{E}}和Δη随组成的变化关系由Redlich-Kister方程进行了回归,得到方程参数。结果表明,V_{\mathrm{m}}^{\mathrm{E}}和Δη值与理想溶液间为负偏差,且存在最小值,说明二元体系中[N₁₁₁C₃MIM][N(CN)₂]₂和溶剂分子间相互作用力更强,同时与所研究分子的大小和形状的差异有关。同时,V_{\mathrm{m}}^{\mathrm{E}}和Δη随温度的变化关系表明,温度对研究混合物中的分子间相互作用有很大影响。     

含盐液体混合物的粘度 Ⅲ．水—有机溶剂—盐三元溶液粘度的拟二元溶质聚集模型

结合水溶液粘度的溶质聚集模型和拟二元方法，作者提出了一个适用于水－有机溶剂－盐三元溶液粘度关联的拟二元溶质聚集模型（PSAV），能够成功地应用于以盐饱和与不饱和水溶液粘度的关联，平均相对偏差约1．0％，比作者早先提出的拟二元局部组成模型（平均相对偏差为2－5％）有较大的改善，对于盐不饱和溶液，模型参数随浓度和温度呈有规律的变化。     

离子液体[BPy]BF4和甲醇二元混合体系的超额摩尔体积、折射率和黏度

合成了室温离子液体N-丁基吡啶四氟硼酸盐([BPy]BF4),通过核磁共振1H-NMR和红外光谱IR对其结构进行了表征.在298.15 K和常压下,采用U形振荡管密度计测定[BPy]BF4-甲醇体系的密度;用阿贝尔折射仪测定了该二元混合体系在相同温度和压力下的折射率;用乌氏黏度计测定了该二元混合体系在相同温度和压力下的...     

二元混合物环丁酚和对二甲苯、乙苯在温度范围为303.15—353.15K下的密度、黏度及其相关性质

Densities and viscosities of the binary systems of sulfolane ＋ ethylbenzene, sulfolane ＋ p-xylene have been experimentally determined in temperature interval 303.15—353.15 K and at atmospheric pressure for the whole composition range. The excess molar volumes and viscosity deviations were computed. The computed quantities have been fitted to Redlich-Kister equation. Excess molar volumes and viscosity deviation show a systematic change with increasing temperature. Two mixtures exhibit negative excess volumes with a minimum which occurs approximately at χ = 0.5. The effect of the size, shape and interaction of components on excess molar volumes and viscosity deviations is discussed.     

对二甲苯与环己烷、正庚烷、正辛烷、环丁砜和N-甲基-2-吡咯烷酮和乙酸二元混合物在303．15K和323．15K的超额体积和黏度

Experimental data on density and viscosity at 303.15K and 323.15K are presented for the binary mixtures of p-xylene with cyclohexane, n-heptane, n-octane, sulfolane, N-methyl-2-pyrrolidone and acetic acid. From these data, the excess molar volume and deviations in viscosity have been calculated. The computed quantities have been fitted to the Redlich-Kister Equation to derive coefficients and estimate the standard error values. Results are discussed in terms of intermolecular interactions.     

基于电性拓扑状态指数的二元液体混合物自燃温度的预测

利用AITTA551自燃温度测试仪,测得不同组分和配比下的28组168个二元可燃混合液体自燃温度（AIT）;基于电性拓扑状态指数（ETSI）理论,计算获得不同原子类型所对应的混合ETSI值;采用添加指数递减惯性权重的改进粒子群算法（MPSO）优化支持向量机（SVM）的超平面参数,建立根据原子类型混合ETSI值来预测混合物自燃温度的MPSO-SVM模型。结果表明,基于电性拓扑状态指数能够有效预测二元液体混合物自燃温度,MPSO-SVM模型的复相关系数R²为0.991,平均绝对误差AAE为3.962 K。MPSO-SVM模型的泛化性能和预测精度明显优于多元线性回归（MLR）、网格搜索法（GSM-SVM）、遗传算法（GA-SVM）、标准粒子群算法（PSO-SVM）模型。本研究为工程上提供了一种预测二元混合物自燃温度的有效途径。     

不同温度压力下乙醇—乙酸乙酯体系液体密度的测定和预测

使用ＤＭＡ５５型精密密度和ＤＭＡ５１２型高压外测量池，测定了乙醇－乙酸乙酯体系在温度范围内２２８．１５Ｋ至３１８．１５Ｋ和压力从常压至１９．５ＭＰａ下的液体密度。应用三重随机局部组成密度模型，预测了该体系在不同温度，压力下的密度，取得了令人满意的结果。     

Excess Molar Volume, Viscosity and Heat Capacity for the Binary Mixture of p-Xylene and Acetic Acid at Different Temperatures

Experimental densities, viscosities and heat capacities at different temperatures were presented over the entire range of mole fraction for the binary mixture of p-xylene and acetic acid. Density values were used in the determination of excess molar volumes, VE. At the same time, the excess viscosity and excess molar heat capacities were calculated. The values of VE, ηE and cpE were fitted to the Redlich-Kister equation. Good agreements were observed. The excess molar volumes are positive with a large maximum value located in the central concentration range. The excess viscosity has an opposite trend to the excess molar volume VE. ηE values are negative over the entire range of the mixture. The cure of dependence of cpE on concentration has a special shape. The molecular interaction between p-xylene and acetic acid is discussed.     

Density and Excess Molar Volume of Binary Mixtures ofp-Xylene＋Acetic Acid and o-Xylene＋Acetic Acid at Different Temperatures and Pressures

A new apparatus was designed with a thick-walled glass capillary, electric heater tube with red copper and heat preservation. The thick-walled glass capillary was used for its advantages of resistance to acid corrosion and pressure, and ease of observation. The experimental densities over the entire range of mole fraction for the binary mixture of p-xylene＋acetic acid and o-xylene＋acetic acid were measured using the new apparatus at temperatures ranging from 313.15K to 473.15K and pressure ranging from 0.20 to 2,0 MPa. The density values were used in the determination of excess molar volumes, W. The Redlich-Kister equation was used to fit the excess molar volume values, and the coefficients and estimate ot the standard error values were presented. The experimental resuits prove that the density measurement apparatus is successful.     

二甲苯与环丁砜混合液粘度和密度测定及关联

在常压下采用U形振动管密度计测定了对二甲苯与环丁砜的混合液在298 15K～353 15K下的密度,用乌氏粘度计测定了此混合溶液在303 15K～353 10K下的粘度,并由密度数据计算出超额体积VE、由粘度数据计算出了不同温度和组成下的混合粘度的变化,同时对不同温度下的超额体积与组成的关系进行了多元回归,对混合粘度变化随组成的关系按Redlich-Kister方程进行了关联。     

巴豆酸乙酯与乙醇混合液密度和粘度的测定及关联

主要介绍了3-羟基丁酸乙酯合成过程中的相关物系的物性测定.在常压下采用U形振动管密度计测定了巴豆酸乙酯与乙醇的混合液在293.15～343.15 K下的密度,用乌氏粘度计测定了此混合溶液在293.15～343.15 K下的粘度,并由密度数据计算出超额体积V E、由粘度数据计算出了不同温度和组成下的混合粘度的变化Δη,V E和Δη这些值均为负值.同时对不同温度下的超额体积与组成的关系,粘度变化与组成的关系分别用Redlich-Kister方程进行了关联,最大标准偏差小于5%;说明此方程可适用于回归两相体系中上述的物性数据.     

环己酮-环己烷混合液密度和粘度的测定及关联

在常压下分别测定了环己酮与环己烷的混合液在293,15～343．15K下的密度和粘度,并由密度数据计算出超额体积V^E、由粘度数据计算出了不同温度和组成下的超额粘度△η,V^e为正值,△η为负值;同时对不同温度下的超额体积、超额粘度与组成的关系分别用Redlich—Kister方程进行了关联,最大标准偏差小于3％,说明此体系适合采用Redlich—Kister方程回归。混合溶液的粘度随温度的关系用Andrade公式进行了关联,各组成关联的相关系数接近于1。     

常压下二乙二醇单乙醚和水二元体系不同温度下的密度、黏度及过量性质

Densities and viscosities were measured as a function of composition for binary liquid mixture of diethylene glycol monoethyl ether [CH3CH2O(CH2)2O(CH2)2OH] + water from 293.15 to 333.15 K at atmospheric pressure, with a capillary pycnometer and Ubbelohde capillary viscometer respectively. From the experimental data, the excess molar volume VE, viscosity deviation &#61508;η, and the excess energy of activation for viscous flow &#61508;G*E were calculated. These data were correlated by the Redlich-Kister type equa-tions to obtain the coefficients and standard deviations. The results showed a strong molecular interaction between diethylene glycol monoethyl ether and water.     

二元混合物环丁酚和对二甲苯、乙苯在温度范围为303.15-353.15K下的密度、黏度及其相关性质

Densities and viscosities of the binary systems of sulfolane ethylbenzene, sulfolane p-xylene have been experimentally determined in temperature interval 303.15-353.15 K and at atmospheric pressure for the whole composition range. The excess molar volumes and viscosity deviations were computed. The computed quantities have been fitted to Redlich-Kister equation. Excess molar volumes and viscosity deviation show a systematic change with increasing temperature. Two mixtures exhibit negative excess volumes with a minimum which occurs approximately at x = 0.5. The effect of the size, shape and interaction of components on excess molar volumes and viscosity deviations is discussed.     

2-甲基-3-丁烯-2-醇+直链一元醇二元体系的过量摩尔体积和表观摩尔体积298.15 K)

Excess molar volumes (Vm^E) of binary mixtures of 2-methyl-3-buten-2-ol[CH3C(OH)(CH3)CHCH2] with four 1-alcohols:methanol,ethanol,1-propanol and 1-butanol at 298.15K and atmospheric pressure are derived from density measurements with a vibrating-tube densimeter.All the excess volumes are negative in the systems over the entire composition range. The results are correlated with the Redlich-Kister equation.The effects of chain length of 1-alcohols on Vm^E are discussed.The apparent molar volumes of 2-methyl-3-buten-2-ol and 1-alcohols are calculated respectively.