超临界CO2+碳酸二乙酯二元体系高压气-液相平衡

在带有石英视窗的可变体积高压釜内,于333,353,373和393K等4个温度下,测定了3.0～15.0MPa范围内超临界CO2与碳酸二乙酯(DEC)二元体系的气-液平衡数据.结果表明,当温度恒定时,随着压力的增大,液相中超临界CO2的浓度急剧增大,气相中碳酸二乙酯的浓度缓慢增加.根据实验结果推测出了体系的pc,Tc,xc和Vc等临界性质.     

Vapor-Liquid Equilibrium Data of Carbon Dioxide+Methyl Propionate and Carbon Dioxide+Propyl Propionate Systems

利用可变体积高压釜,在313、333、353和373 K下,测定了CO₂分别与丙烯酸甲酯和丙烯酸丙酯二元体系的气液两相平衡数据. 应用Peng-Robinson状态方程对实验数据进行计算,计算结果与实验结果具有较高的一致性. 还计算得到了不同温度和压力下CO₂在丙烯酸酯溶解过程中的Henry系数、偏摩尔焓变和偏摩尔熵变.     

顺丁烯二酸酐-癸二酸二丁酯二元体系等温气液平衡

利用改进的沸点仪测定了顺酐-癸二酸二丁酯二元体系在413.15, 433.15和453.15 K下的等温气液平衡数据以及纯癸二酸二丁酯和顺酐的饱和蒸气压数据. 通过与文献值对比, 验证了此方法的可靠性. 同时, 将实验数据回归得到了纯癸二酸二丁酯和顺酐的Antoine常数. 利用NRTL方程进行了气液平衡数据的关联推算, 得到了顺酐-癸二酸二丁酯二元体系的NRTL模型参数. 利用UNIFAC基团贡献法对实验数据进行了预测, 其结果与实验值及运用NRTL方程拟合的结果吻合较好.     

高温高压下水与非极性流体间的界面张力

The pendent drop or standing bubble method is applied to measure the interfacial tensions between water and nonpolar fluids (n-hexane, n-heptane, nitrogen, oxygen and methane) up to 473K and 220MPa. The high pressure autoclave with t wo visual windows and the auxiliary equipment are described. The sizes(ca 2mm) and shapes of drops or bubbles are recorded with microscope and video camera. The use of digital image permits fast, precise determination of the contour parameters. The densit y values of the liquids or gases have been chosen from literature. A special program is proposed to calculate the interfacial tensions automatically from drop shape at given temperature and pressure. The interfacial tensions σ12 increase with pr essure for the two liquid-liquid systems, but decrease with pressure for the three gas-liquid systems.     

顺丁烯二酸酐与邻苯二甲酸二甲酯二元体系在4.00, 8.00和12.00 kPa下的等压气液平衡

采用沸点仪测定了顺丁烯二酸酐和邻苯二甲酸二甲酯二元体系在4.00, 8.00和12.00 kPa下的等压气液平衡数据以及纯DMP组分饱和蒸气压数据, 将实验数据回归得到了纯DMP在417~525 K范围内的Antoine方程. 根据实验平衡温度、 压力和组成数据进一步回归得到NRTL方程参数, 推算出平衡气液相组成, 并利用UNIFAC方程对实验数据进行了预测, 其结果与沸点仪测定结果及NRTL拟合的结果基本相符.     

高压下CO2-乙醇二元系统的气液平衡

在带有可视石英窗的可变体积高压釜内,在60－180 ℃温度范围、 4.0－14.5 MPa压力范围下测定了CO2和乙醇二元系统的相平衡数据.根据实验结果预测了pc,Tc,xc.用Peng Robinson方程和Wong Sandler混合规则进行了拟合,所得结果与实验数据基本相符.     

Fusion curves and thermodynamic properties of carbon tetrachloride, chloroform, bromoform and silicon tetrachloride at pressure up to 3500 MPa

The fusion temperature as a function of pressure for carbon tetrachloride, chloroform, bromoform and silicon tetrachloride at pressures up to 3500MPa has been determined. The experimental data were fitted by the equation Tfus=T0（1 ＋ Δp/a1）^a2 exp（-a3Δp） and the changes of the maolar enthalpy and molar internal energy on fusion were calculated using the parameters of the fitted equation. Comparisons with the data from the literature show that the experimental data, parameters of fitted equations, changes of the molar enthalpy and molar internal energy are reliable.