正丁醇-水-醋酸丁酯三元物系液-液平衡数据的测定、关联和预测

测定了由正丁醇、水和醋酸丁酯形成的三元物系及部分互溶二元物系在20℃、30℃和40℃的LLE(液液平衡)数据,并与文献中已有的正丁醇-水的LLE实测数据核对,说明了测定方法的可靠性.用NRTL和UNIQUAC方程分别进行了三元和二元LLE数据的关联和预测.根据溶液热力学特性对二元LLE模型参数进行了鉴别.在三元LLE数据的关联中,对两种目标函数(摩尔分数和分配系数)进行了比较,并对前一种目标函数中的权重取值问题进行了考察.通过对部分互溶二元物系参数的评选,提高了利用二元参数对三元物系进行预测的准确度.     

2-丁酮-水-甲苯、环己酮、4-甲基-2-戊酮三元体系液液平衡的测定及关联

测定了2-丁酮-甲苯-水体系在303.15和323.15K、2一丁酮一4一甲基一2一戊酮一水体系在293.15、303.15和313.15K,2-丁酮-环己酮-水体系在293.15和313.15K下的LLE数据.实验数据用NRTL方程关联,部分互溶对和互溶对的方程参数分别从二元和三元LLE数据得到,关联结果与实验数据符合良好.     

醋酸甲酯-甲醇-水三元物系液液平衡数据的测定与关联

测定了常压下20、30、40、50℃时醋酸甲酯 水二元体系及醋酸甲酯 甲醇 水三元体系的液液平衡(LLE)数据,并与文献中已有的醋酸甲酯 水的液液平衡数据进行比较,证明了测定方法的可靠性。采用二元与三元液液平衡数据相结合的关联方法,并用NRTL和UNIQUAC模型对所测数据进行了热力学关联,得出了相应的模型参数。用该模型对三元体系进行计算,结果令人满意。用VisualBasic6.0语言开发了液液相平衡关联软件,可方便地用于二元和三元液液相平衡的计算。     

苯-噻吩-二甲基亚砜体系等压汽液相平衡研究

采用汽液双循环相平衡仪测定了101.33 k Pa下苯-噻吩、苯-二甲基亚砜及苯-噻吩-二甲基亚砜的等压汽液相平衡数据。两组二元体系实验数据均通过了Herington面积法的热力学一致性检验,分别采用NRTL和UNIQUAC活度系数模型对二元体系实验数据进行热力学关联,得到了相应的模型参数,温度偏差和汽相组成偏差,关联结果表明两种模型均能较好的关联实验数据,其中UNIQUAC模型的关联结果稍优于NRTL。利用二元体系UNIQUAC模型参数预测三元体系汽液平衡数据,预测值与实验值相比,平均温度偏差1.37 K,汽相各组分平均绝对偏差均在3%以内,获得了较优的预测结果,从而为工业上苯-噻吩萃取精馏分离过程提供可靠的热力学基础数据。     

甲基叔丁基醚-甲醇-二甲基亚砜三元气液平衡数据测定与关联

在101.325 kPa下,用气液平衡装置测定了甲基叔丁基醚-甲醇、甲醇-二甲基亚砜、甲基叔丁基醚-二甲基亚砜和甲基叔丁基醚-甲醇-二甲基亚砜四种体系在不同气液相组成时的沸点。二元体系活度系数分别用Wilson模型和NRTL模型进行关联,用最小二乘法求出了三个二元体系模型参数并用这些参数来计算了气相组成y与泡点温度T。由面积积分法检验二元体系相平衡数据得到很好的热力学一致性。用Wilson模型和NRTL模型参数分别对三元体系数据进行关联,计算气相组成及泡点温度,计算结果与实验数据吻合较好,表明文中所用的模型适于甲基叔丁基醚-甲醇-二甲基亚砜体系。     

正庚烷-DMF二元汽液平衡和液液平衡数据的测定及关联

采用改进的Rose-Williams釜,在101kPa下,测定了正庚烷-DMF二元体系的VLE数据。并用改进的液液平衡釜在常压下,测定了该二元体系(从293.2到341.2K)的LLE数据。应用NRTL和UNIQUAC两种模型关联了所测体系的相平衡数据,结果是令人满意的。     

含辛烯醛体系的液液、汽液相平衡研究

测定了水-辛烯醛、水-正丁醇二元系在常压下的液液平衡数据及26.66kPa下的正丁醇-辛烯醛二元系和水-正丁醇-辛烯醛三元系的汽液平衡数据.由测定的3对二元数据求取了NRTL常数及有规参数,并与三元数据进行拟合,计算值与实验值符台良好,液液平衡与汽液平衡得到了统一的关联.     

模型煤焦油中酚类萃取的LLE数据测定与关联

针对低温煤焦油中酚类化合物萃取分离的工艺设计和优化所需基础数据的缺失,以环丁砜为萃取剂,分别测定了101.3 kPa下323.15和343.15 K时正庚烷+苯酚/邻甲酚+环丁砜三元体系液液相平衡(LLE)数据和323.15 K时正庚烷+甲苯+苯酚/邻甲酚+环丁砜四元体系的LLE数据,并将结果绘制在三元相图中。利用Bachman方程和Hand方程对实验数据进行了可靠性检验,相关系数R2大于0.98,表明实验数据可靠性较好。采用NRTL模型和UNIQUAC模型对实验数据进行关联,并对二元交互作用参数进行回归。2种模型的均方根偏差均小于1%。结果表明二者均能成功地对LLE实验数据进行关联,相应的二元交互作用参数可用于分离工艺的设计和优化。     

HPP-H_2O-Na_2SO_4双水相液液相平衡的测定及NRTL方程关联

本文测定了303.15~323.15 K的N,N'-二(2-羟丙基哌嗪(HPP)-水-硫酸钠)双水相系统不同浓度时液液相平衡数据,并采用NRTL方程对相平衡数据进行了关联。结果表明:在实验温度范围内,NRTL模型能很好地关联该三元两相物系的相平衡数据,计算值与实验值的相对均方根误差(RMSD)和平均相对误差(AAD)分别低于2%和1.5%,除HPP与Na_2SO_4之间的二元交互作用参数外,其余二元交互参数均会随着温度发生变化,其中Na_2SO_4对H_2O的二元交互作用参数受温度的影响最明显,313.15 K时达到最大。     

甲基二氯硅烷-甲基三氯硅烷-苯三元体系等压汽液平衡

利用新型泵式沸点仪,在101.3 kPa下测定了甲基二氯硅烷-甲基三氯硅烷-苯体系以及3个二元体系在不同液相组成时的沸点;对所测的二元系数据,采用间接法由TPx推算了与之平衡的汽相组成,再用最小二乘法分别求出了二元体系的Wilson、NRTL、Margules和van Laar 4种模型的最佳配偶液相活度系数模型参数,并由二元最佳配偶参数推算了甲基二氯硅烷-甲基三氯硅烷-苯三元体系的气相组成和泡点温度,与实验测得的温度值进行了比较,其拟合精度良好,关联结果令人满意.     

BOILING POINT TEMPERATURES OF THE BINARY MIXTURES OF 1,3-DIMETHYLBENZENE WITH METHANOL, 1-PROPANOL, OR 2-PROPANOLAT 95 kPA

Boiling point temperatures at 95 kPa over the entire composition range are measured for the three binary systems formed by 1,3-dimethylbenzene with methanol, 1-propanol, and 2-propanol. A Swietoslawski-type ebulliometer was used for the measurements. The composition versus temperature measurements are well represented by the Wilson model.     

Boiling point temperatures of the binary mixtures of 1,3-dimethylbenzene with methanol, 1-propanol,or 2-propanolat 95 kPa

Boiling point temperatures at 95 kPa over the entire composition range are measured for the three binary systems formed by 1,3-dimethylbenzene with methanol, 1-propanol, and 2-propanol. A Swietoslawski-type ebulliometer was used for the measurements. The composition versus temperature measurements are well represented by the Wilson model.     

BUBBLE TEMPERATURE MEASUREMENTS ON THE BINARY MIXTURES OF 1,4-DIMETHYLBENZENE WITH ISO-, SEC-, AND TERT- BUTANOLS AT 95 kPa

Bubble temperatures at 95 kPa over the entire composition range were measured for the three binary systems formed by 1,4-dimethylbenzene with iso-, sec-, and tert- butanols. A Swietoslawski-type ebulliometer was used for the measurements. The composition versus temperature measurements are well represented by the Wilson model.     

Structural Relaxations in Alkali Silicate Systems by Brillouin Light Scattering

The Brillouin light scattering technique was used to investigate the viscoelastic relaxations in alkali silicate systems up to temperatures of 1500°C. The line shape analysis of the Brillouin spectra reveals information about the mechanical rigidity and the viscous dissipation in the scattering medium. Brillouin frequency shifts and the frequency-dependent viscosity coefficients, v ' were measured as a function of temperature. The shapes of the v ' vs temperature curves, and the location of their maxima on the temperature scale, reveal the activation energies and the resonance frequencies of the underlying mechanisms. In binary alkali silicates, small dissipation maxima were observed between the glass transition and the melting temperature, which are attributed to the increased cation mobility as a result of the accelerated disintegration of the silica networks. In mixed alkali systems, multiple dissipation maxima are observed. These are spread over a range of temperatures, which are distinctly higher than in binary systems.     

BUBBLE TEMPERATURES OF THE BINARY MIXTURES OF 1,2-DIMETHYLBENZENE WITH 2-PROPANOL, 1-BUTANOL, 2-BUTANOL, 2-METHYLPROPAN-1-OL AND 2-METHYLPROPAN-2-OL AT 95 kPa

Bubble temperatures at 95 kPa over the entire composition range are measured for the five binary systems formed by 1,2-dimethylbenzene with 2-propanol, 1-butanol, 2-butanol, 2- methylpropan-1-ol, and 2-methylpropan- 2-ol. A Swietoslawski - type ebulliometer was used for the measurements. The composition versus temperature measurements are well represented by the Wilson model.     

BUBBLE TEMPERATURES OF THE BINARY MIXTURES OF 1,2-DIMETHYLBENZENE WITH 2-PROPANOL, 1-BUTANOL, 2-BUTANOL, 2-METHYLPROPAN-1-OL AND 2-METHYLPROPAN-2-OL AT 95 kPa

Bubble temperatures at 95?kPa over the entire composition range are measured for the five binary systems formed by 1,2-dimethylbenzene with 2-propanol, 1-butanol, 2-butanol, 2- methylpropan-1-ol, and 2-methylpropan- 2-ol. A Swietoslawski - type ebulliometer was used for the measurements. The composition versus temperature measurements are well represented by the Wilson model.     

Calculation of Viscosities of Liquid Mixtures Using Eyring’s Theory in Combination with Cubic Equations of State

1 INTRODUCTON The viscosity, particularly that of liquid mixtures is very important in engineering calculations involved in the process design for petroleum and other chemica industries. Since the successful development of a one-parameter equation for correlating the liquid vis cosity of nonpolar mixtures by Grunberg and Nissan[1] many other models have been proposed. Most of them are based on the corresponding state principle, the absolute rate theory of Eyring[2], or the free volume the…     

立方型状态方程结合Eyring理论在液体混合物黏度计算中的应用

Cubic equations of state (EOS) have been combined with the absolute rate theory of Eyring to calculate viscosities of liquid mixtures. A modified Huron Vidal gE-mixing rule is employed in the calculation and in comparison with the van Laar and the Redlich-Kister-type mixing rule. The EOS method gives an accurate correlation of liquid viscosities with an overall average deviation less than 1% for 67 binary systems including aqueous solutions. It is also successful in extrapolating viscosity data over a certain temperature range using parameters obtained from the isotherm at a given temperature and in predicting viscosities of ternary solutions from binary parameters for either polar or associated systems.     

用拓扑法关联预测气液平衡的研究

用TTM法的十个模型关联了三个二元物系的VLE,并进行了模型选择,还关联了恒压、恒温二元系的VLE,又对用某温度下的参数预测相邻温度下的气液平衡以及由已知二元数据预测由组分同系物组成的其它二元系的气液平衡进行研究。结果表明,对所研究的含醇和丙酮物系,用TTM法关联的结果一般与用Margules方程相近,比用UNIQUAC,Wilson方程差,但用TTM法计算简单。用该法预测相邻温度下的VLE是可行的,而预测同系物组成的二元系尚需进一步研究。     

Densities and excess volumes of aqueous monoethanolamine and diisopropanolamine systems at atmospheric pressure from 303.15 K to 333.15 K

The densities of water+monoethanolamine (MEA), water+diisopropanolamine (DIPA), DIPA+MEA binary systems and water+DIPA+MEA ternary system were measured over the full range of composition at temperatures from 303.15 K to 333.15 K by using an Anton Paar digital vibrating tube density meter (DMA4500). The experimental excess volumes were obtained from the experimental density results and fitted using the Redlich-Kister-Muggianu expression. The parameters obtained from the binary excess volume data were used for the correlation of ternary system with one additional ternary parameter for each isotherm. All investigated binary and ternary systems are completely miscible, because the values of excess volume are negative under the examined conditions.