1-甲氧基-2-丙醇水癸烷的液液平衡

通过测定可作界面活性剂的 1 甲氧基 2 丙醇、癸烷和水的液液相平衡数据 ,考察 1 甲氧基 2 丙醇、癸烷以及水的混合液三元体系的相行为 ,并将实验结果和extendedUNIQUAC溶液模型的计算结果进行比较。结果表明 :在 2 98.15K时测得 1 甲氧基 2 丙醇、癸烷和水的相平衡数据和用extendedUNIQUAC模型推算结果相当吻合 ,extendedUNIQUAC模型成功地描述了 1 甲氧基 2 丙醇、癸烷和水混合溶液的液液相平衡。     

含水和界面活性剂2-异丙氧基乙醇的混合物的液液平衡

测定了可用作界面活性剂的2-异丙氧基乙醇、癸烷和水在25℃时的液液相平衡数据,并用热力学模型ExtendedUNIQUAC模型推算了这些实验数据,Extended UNIQUAC模型成功地描述了2-异丙氧基乙醇、癸烷和水的液液三相平衡,准确地推算2-异丙氧基乙醇、癸烷和水混合液的热力学性质,实验结果和计算结果的均方根误差为1.01.     

水-甲基叔丁基醚-二异丙醚三元体系液液相平衡的研究

在常压下测定了不同温度时水-甲基叔丁基醚-二异丙醚三元体系的液液平衡,并用Modified UNIQUAC模型和Extended UNIQUAC模型对所测体系进行了关联计算．Modified UNIQUAC模型的计算结果与实验数据的关联性更好。     

水-丙烯酸-甲基异丁基甲酮体系液液平衡数据的测定与关联

为萃取-共沸精馏法分离丙烯酸水溶液选择适宜的溶剂,采用液液平衡釜,在常压下测定了293.15,303.15,313.15 K下水-丙烯酸-甲基异丁基甲酮三元体系的液液平衡数据.使用Hand方程对实验数据进行拟合,相关性系数的平方均大于0.99.利用Aspen Plus过程模拟软件的数据回归系统,分别采用非随机双液(NR...     

乙醇/丙醇-水-复合溶剂体系汽液平衡研究

为研究复合萃取溶剂体系下醇-水的汽液平衡,分别选用盐质量浓度为0.2 g/mL的乙二醇+氯化锂、乙二醇+醋酸钾2种复合萃取溶剂,测定了101.3 kPa下不同溶剂体积比(0.5∶1,1∶1,2∶1)时乙醇-水和丙醇-水的汽液平衡数据。分别用W ilson和NRTL热力学模型对所测汽液平衡数据按拟三元体系进行了关联。利用工业规模的实验装置,对测定结果进行了验证。结果表明,复合萃取溶剂能使乙醇-水和丙醇-水体系的共沸点消失,大大改变了体系中醇与水的相对挥发度。关联结果表明,W ilson热力学模型较NRTL热力学模型更适于乙醇/丙醇-水复合萃取溶剂体系。工业规模生产数据验证了所测定数据的可靠性,乙醇产品纯度可达到99.85%。     

水-二乙氧基甲烷-乙苯/苯甲醚的液液相平衡

为了探索不同萃取剂萃取分离水-二乙氧基甲烷共沸物的能力,在大气压力下,以乙苯和苯甲醚为萃取剂,分别测定了303.15和313.15 K时水-二乙氧基甲烷-乙苯/苯甲醚体系的液液相平衡数据.通过计算所得分离因子远大于1,表明乙苯和苯甲醚均为此体系的优良萃取剂.使用Othmer-Tobias和Hand经验方程对实验数据进行...     

水-乙酸-2-乙基己醇三元体系液液平衡测定及关联

测定了常压下２８８．１５Ｋ、２９３．１５Ｋ、２９８．１５Ｋ及３０３．１５Ｋ时水－乙酸－２－乙基己醇三元体系的液液平衡数据，并用ＮＲＴＬ模型对实验数据进行关联。关联结果与实验数据符合良好。     

水-丙烯酸-醋酸-甲苯四元体系液液平衡数据的测定与关联

采用液液平衡釜,在常压下,测定了293.15,303.15,313.15 K时水-丙烯酸-醋酸-甲苯四元体系的液液平衡数据,为萃取-非均相共沸精馏法精制丙烯酸选择适宜的溶剂提供依据.使用Othmer-Tobias方程对实验数据进行线性拟合.分别采用非随机双液(NRTL)和通用似化学(UNlQUAC)活度系数模型对实验体...     

水-乙醇-甲基异丁基甲酮体系液液相平衡数据的测定与关联

在常压下测定了水-乙醇-甲基异丁基甲酮体系在308.15,318.15,328.15 K的液液相平衡数据。用Hand方程和Othmer-Tobias方程对实验数据进行拟合,结果表明:Hand方程拟合效果优于Othmer-Tobias方程。采用NRTL模型和UNIQUAC模型对实验数据进行了关联,回归得到了该三元物系的二元交互参数;并对此物系的相平衡数据进行了预测,由模型计算值和实验值的均方根偏差知,NRTL模型能更好地与实验数据吻合。     

自吸循环高压平衡釜测定汽液平衡研究

用自行设计的自吸循环高压平衡釜装置,测定了４２３．１５Ｋ,４３３．１５Ｋ恒温条件下的醋酐－二醋酸亚乙酯二元汽液平衡数据。用ＵＮＩＱＵＡＣ模型对实验数据进行关联,关联结果与实验数据符合良好。该装置具有结构简单、取样方便、达到平衡速度快的特点。     

N-甲酰吗啉加水溶剂抽提芳烃的液液平衡

用液液平衡釜测定了常压 ,60℃下加水 N-甲酰吗啉和苯、甲苯、对二甲苯、正庚烷、甲基环己烷组分间 6个拟三元体系的液液平衡 ,得到了拟三元液液平衡体系的共轭相组成和分配曲线 ;实验数据用 UNIQUAC和NRTL模型进行了关联 ;用共轭相作图拟合法和模型参数推算法获得了各体系的褶点数据 ;并求得了溶剂对溶质的选择性和分配系数     

二元液体混合物非理想吸附平衡数据的预测

根据气相吸附和液相吸附的热力学一致性条件 ,从溶液理论、表面热力学出发并结合相交换模型 ,提出从气相吸附平衡数据预测二元液体混合物吸附平衡的模型 ,模型中仅含 4个未知参数 .应用该模型对二元液体吸附体系进行了预测 ,结果与实验数据相当吻合     

A COMPARISON OF DISTRIBUTION FUNCTIONS FOR CALCULATION OF PHASE EQUILIBRIA OF CONTINUOUS MIXTURES

Ill-defined fluid mixtures containing too many components for complete analysis are often described in terms of continuous distribution functions of boiling point or molecular weight or in terms of pseudo-components. For many systems, the choice of the pseudo-component method or one of the standard distribution-function approaches can significantly affect the calculated phase equilibria.

For three sample systems, a comparison is made of the pseudo-component method, the method of moments, the Lobatto quadrature method, and our new method in which cubic-spline approximations are incorporated. The accuracy of representation of the composition distribution function is compared, as well as the calculated phase equilibria and CPU times.

Although each method has advantages for specific types of systems and calculations, the cubic-spline method was found, in general, to be most accurate and adaptive, with only slight increases in computation times     

A COMPARISON OF DISTRIBUTION FUNCTIONS FOR CALCULATION OF PHASE EQUILIBRIA OF CONTINUOUS MIXTURES

Ill-defined fluid mixtures containing too many components for complete analysis are often described in terms of continuous distribution functions of boiling point or molecular weight or in terms of pseudo-components. For many systems, the choice of the pseudo-component method or one of the standard distribution-function approaches can significantly affect the calculated phase equilibria.

For three sample systems, a comparison is made of the pseudo-component method, the method of moments, the Lobatto quadrature method, and our new method in which cubic-spline approximations are incorporated. The accuracy of representation of the composition distribution function is compared, as well as the calculated phase equilibria and CPU times.

Although each method has advantages for specific types of systems and calculations, the cubic-spline method was found, in general, to be most accurate and adaptive, with only slight increases in computation times     

CALCULATION OF VAPOR-LIQUID EQUILIBRIA AND SATURATED LIQUID VOLUMES FOR WATER-AMMONIA MIXTURES

The approach of using T, at ΔZ= Z^s _vZ^{s L} = 0.5 for a balanced representation of saturated volumes (V^{s L} and V^{s Vs L}( of pure components has been extended from non-polar fluids to water and ammonia. For the mixtures of these two compounds, the average absolute percentage deviation in the calculated V ^{s L} values is less than 2% without affecting the representation of vapor-liquid equilibrium values.     

VAPOR-LIQUID EQUILIBRIA FOR MIXTURES OF TOLUENE AND POLYSTYRENE WITH DIFFERENT MOLECULAR WEIGHTS

An experimental system for measuring the VLE of polymer solutions based on the staticvapor-pressure method has been established,VLE data for mixtures of toluene and polystyrene withdifferent molecular weight covering a wide range from 2.98×10~3 to 3.84×10~6 were obtained at 35℃.The reduced pressure p/p°versus weight fraction W plot is found to be independent on the molecularweight of the polymer within the experimental error.Calculated activity coefficients are also independenton the molecular weight.However,for the Flory-Huggins interaction parameter x,not only a strongconcentration dependence is observed,but also the molecular weight of the polymer exerts definiteinfluence.Generally,the parameter x slightly increases as the molecular weight of the polymer decreasesespecially when the molecular weight is low.The dependence of the parameter x on the molecularweight can be neglected when the molecular weight of polymer is greater than 1.00×10~4.     

聚甲基丙烯酸丁酯-丙酮系统的汽液平衡

用石英弹簧称重法测定了25℃时,丙酮与3种不同摩尔质量的单分散聚甲基丙烯酸丁酯溶液的汽液平衡.结果表明在实验误差范围内,相对蒸汽压ρ_1/ρ_(?)对液相质量分数w_1作图所得曲线与聚合物的摩尔质量无关.由实验数据计算所得Flory-Huggins相互作用参数X显著依赖于溶液浓度,聚合物摩尔质量也有轻微影响.用修正的Freed模型进行关联,取得了良好的效果.