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A G^E/Equation of State Mixing Rule for vapor-liquid Equilibria

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Chinese Journal of Chemical Engineering 1998年第3期6卷 14-28页

作者：屈一新汪文川 Lee Y.Y. Chung K.Y. Lee Y.W. Korea Institute of Science and Technology SeoulKorea

A new excess Gibbs free energy/equation of state type mixing 0rule was derived byremoving the infinite pressure boundary condition imposed by Wong and *** mixing rulewas extensively tested in terms of a comprehensive data base,consisting of 52 simple nonpolar-nonpolar,carbon dioxide containing,hydrocarbon-hydrocarbon,CFC,polar-polar,nonpolar-polarbinary and multicomponent *** on the complete predictive capability,a comparisonbetween the Wong-Sandler and the mixing rule proposed was *** results indicate that thenew mixing rule is in general superior to the Wong-Sandler’s,and the binary interaction parameteras required by the latter is removed,which reduces computing effort and is reliable in predictions ofvapor-liquid equilibria from low pressures to high pressures.

关键词： vapor-liquid equilibria equation of state mixing rule

Investigation of vapor-liquid Ejector with Organic Working Fluids

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Journal of Thermal Science 2019年第1期28卷 61-71页

作者： CHEN Jianyong HUANG Yisheng NIU Zhiting LUO Xianglong CHEN Ying YANG Zhi School of Material and Energy Guangdong University of Technology Guangdong Provincial Key Laboratory of Functional Soft Condensed Matter

The vapor-liquid ejector is a simply flow device and driven by thermal energy. In this paper, a modified mathematical model of the vapor-liquid ejector is proposed, and the validation shows good agreements with the experimental data. A study is carried out with six organic working fluids, namely R1233 zd(E), R1336 mzz(Z), R236 ea, R245 ca, R245 fa and R365 mfc. The influences of the entrainment ratio, the area ratio, the superheating at the vapor nozzle inlet, the subcooling at the liquid nozzle inlet, and the pressures at these inlets on the pressure lifting are parametrically investigated. An increase in the subcooling leads to the great increasing of pressure lifting and the superheating has slight effect on the pressure lifting, whereas others have the opposite tendency. The studies of the pressures and temperatures at the typical locations inside the vapor-liquid ejector are further conducted by using R1336 mzz(Z). The results show that the above parameters have great influence on these pressures and temperatures inside except that the pressures are insignificantly impacted by the superheating, and the temperatures are negligibly affected by the area ratio. R1336 mzz(Z) is recommended as a good working fluid for the vapor-liquid ejector.

关键词： vapor-liquid ejector modelling organic fluids pressure lifting

BUBBLE POINT PRESSURE MEASUREMENT FOR ISOTHERMAL QUATERNARY SYSTEM AND PREDICTION OF vapor-liquid EQUILIBRIUM

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Chinese Journal of Chemical Engineering 1995年第1期3卷 54-59页

作者：李浩然滕迎韩世钧浙江大学化学系浙江杭州

1 INTRODUCTIONvapor-liquid equilibrium(VLE)relations are required for practical use,such as in the designand operation of disitillation *** the conventional experimental methods of vapor-liquid equilibria,some analytical instruments are *** are time-consuming and dif-ficult for multicomponent system because the proper method for the composition analysis isnot easy to be set up.

关键词： vapor-liquid equilibrium quaternary system quasi-static method ebulliometer

The Performance of EOS Models in the Prediction of vapor-liquid Equilibria in Asymmetric Natural Gas Mixtures

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Chinese Journal of Chemical Engineering 1998年第3期6卷 29-37页

作者：王利生 H.Gardeler J.Gmehling Department of Technical Chemisity University of OldenburgP.O.Box 2503D-26111 OldenburgGermany

The aim of this work is to apply cubic equations of state(EOS)to vapor-liquid equilibriacalculations of gas-heavy hydrocarbon systems,which are asymmetric in molecular size and areusually found in natural *** has been done to test the validity of the original PSRKand the cubic simplified perturbed hard-chain(CSPhC)models for global phase *** results show that both equations overpredict vapor pressure in the near critical *** the prediction of the solubilities of high molecular weight(MW)hydrocarbons in the naturalgas,the PSRK model gives good agreement for the dew point pressure-vapor composition *** of the pure component parameters of the CSPHC EOS for heavy components to fit thevapor-liquid equilibrium(VLE)data has been proved to give significant promoting in ***,further improvement of a van der Waals EOS,such as SRK,PT and DG modelsfor the asymmetric systems by adjusting the three pure component properties,T_c, p_c and ?

关键词： equation of state natural gas vapor-liquid equilibria asymmetric systems

vapor-liquid EQUILIBRIA FOR MIXTURES OF TOLUENE AND POLYSTYRENE WITH DIFFERENT MOLECULAR WEIGHTS

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Chinese Journal of Chemical Engineering 1993年第2期1卷 4-12页

作者：王琨陈一锋傅金彦胡英

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 *** activity coefficients are also independenton the molecular ***,for the Flory-Huggins interaction parameter x,not only a strongconcentration dependence is observed,but also the molecular weight of the polymer exerts ***,the parameter x slightly increases as the molecular weight of the polymer decreasesespecially when the molecular weight is *** dependence of the parameter x on the molecularweight can be neglected when the molecular weight of polymer is greater than 1.00×10~4.

关键词： vapor-liquid equilibria polymer solution Flory-Huggins parameter polystyrene toluene

vapor-liquid EQUILIBRIUM FOR TERNARY MIXTURES OF BENZENE,TOLUENE,AND p-XYLENE

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Chinese Journal of Chemical Engineering 1993年第1期1卷 49-53页

作者：金彰礼胡爱宝刘昆元

vapor-liquid equilibrium composition and temperature were measured for binary andternary mixtures of benzene,toluene and p-xylene at 101.33 kPa The equilibrium cell of *** modified for the present *** experimental vap... 详细信息

关键词： benzene toluene and p-xylene system vapor-liquid equilibrium equilibrium cell

vapor-liquid EQUILIBRIA BY EXTENDED SOAVE EQUATION OF STATE

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Chinese Journal of Chemical Engineering 1993年第2期1卷 62-65页

作者：王琦陈庚华韩世钧

The Soave[1]equation of state is extensively accepted because of its accuracy *** 1988,Tan et al.[2]suggested a modification by introducing atemperature-dependent factor to parameter"b"on the basis of statistical meaning,anda good accuracy was obtained for supercritical fluids as well as fluids approaching criti-cal conditions but not for *** the previous work,an extended Soave equa-tion of state[3]has been proposed to improve the prediction of liquid *** thispaper,the extended equation is used to calculate vapor-liquid equilibria of mixtures atsubcritical conditions.

关键词： equation of state vapor-liquid equilibria

The Isobaric vapor-liquid Equilibrium of Butanone-DMF and Toluene-DMF at Reduced Pressures

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Chinese Journal of Chemical Engineering 2006年第6X期14卷 825-828页

作者：刘畅王丽华何潮洪叶向群

The isobaric vapor-liquid equilibrium data of butanone(1)-N, N-dimethylformamide (DMF)(2) at 100.92kPa, 93.32kPa, and 79.99kPa and of toluene(1)-DMF(2) at 100.92kPa were measured using a modified Rose-Williams still. The above data met the thermodynamic consistency test and were correlated with the Wilson,NRTL, and UNIQUAC equations. These data can be used in the analysis and design of the process that involves separating DMF from butanone and toluene in the leather synthesis industry.

关键词： isobaric vapor-liquid equilibrium, N, N-dimethylformamide, DMF, butanone, toluene, Wilson equation, NRTL equation, UNIQUAC equation

Sensitivity Analysis of Computations of the vapor-liquid Equilibria of Methane + Methanol or Glycols at Gas Hydrate Formation Conditions

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Modeling and Numerical Simulation of Material Science 2019年第1期9卷 1-15页

作者： Christopher E. Ozigagu Anthony J. Duben Department of Chemistry and Biochemistry Stephen F. Austin State University Nacogdoches TX USA

The Soave-Redlich-Kwong (SRK-EOS) and Peng-Robinson (PR-EOS) equations of state are used often to describe the behavior of pure substances and mixtures despite difficulties in handling substances, like water, with high polarity and hydrogen bonding. They were employed in studying the binary vapor-liquid equilibria (VLE) of methane + methanol, monoethylene glycol (MEG), and triethylene glycol (TEG). These liquids are used to inhibit the formation of gas hydrates. The investigation focused on the conditions at which methane-water clathrates can form 283.89?K to 323.56?K and 5.01?MPa to 18.48?MPa. The pressure of methane in methanol is overestimated by a factor of two by either the SRK-EOS or the PR-EOS. In the methane + MEG system, the predicted pressures for both equations of state are generally less than experimental pressure except for the highest concentration of methane in MEG calculated by the SRK-EOS. In the methane + TEG system, the predictions of both models are close and trend similarly. Because of the comparative lack of extensive experimental methane + TEG data, the similarity of the methane + TEG computed results can be used as a basis for further study of this system experimentally.

关键词： vapor-liquid Equilibrium Cubic Equations of State Clathrate Glycols