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( Sung Bum Park ),( Huen Lee ) 한국화학공학회 1997 Korean Journal of Chemical Engineering Vol.14 No.2
Isobaric vapor-liquid equilibrium data for monoethanolamine (MEA)+water and monoethanolamine (MEA)+ethanol were measured in an equilibrium cell circulating both the vapor and liquid phases. The measurements of the boiling temperatures and corresponding equilibrium compositions for two binary mixtures were carried out at the atmospheric pressure. The results were checked for thermodynamic consistency by the point test method. The activity coefficients for nonideality of the liquid phase were calculated by using the Wilson, NRTL, and UNIQUAC equations. The fugacity coefficients for nonideality of the vapor phase were calculated from the virial equation of state with the second virial coefficient. The experimental data were verified to be thermodynamically consistent and showed a good agreement with the calculated values.
Kim, Hakmin,Hyeong, Seonghoon,Hong, Jung Hyun,Kim, Ah Reum,Shin, Moon Sam,Kim, Hwayong Elsevier 2015 The Journal of chemical thermodynamics Vol.86 No.-
<P><B>Abstract</B></P> <P>Isothermal (vapor+liquid) equilibrium data for the binary mixtures of (propylene oxide+ethanol) and (propylene oxide+1-propanol) were measured using a static apparatus at three different temperatures ranging from (303.15 to 333.15)K at an interval of 15K. The measured data were correlated using Peng–Robinson–Stryjek–Vera equation of state (PRSV EOS) combined with van der Waals one-fluid mixing rule for the vapor phase and with Wong-Sandler mixing rule involving a non-random two liquid (NRTL) model, universal quasi-chemical (UNIQUAC) model and Wilson model for the liquid phase. The experimental data are in good agreement with the correlation results.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Phase equilibrium data for propylene oxide with alcohols were investigated. </LI> <LI> The experimental data were correlated with PRSV EOS. </LI> <LI> Van der Waals one fluid and Wong–Sandler mixing rule were used. </LI> <LI> NRTL, UNIQUAC, Wilson models were chosen as <I>G</I> <SUP>E</SUP> models. </LI> <LI> The experimental data are fit well with all three models. </LI> </UL> </P>
VAPOR–LIQUID EQUILIBRIUM MODELING FOR MIXTURES OF HFC-32 + ISOBUTANE AND HFC-32 + HFO-1234ze(E)
RYO AKASAKA 대한설비공학회 2011 International Journal Of Air-Conditioning and Refr Vol.19 No.2
Vapor–liquid equilibrium (VLE) have been successfully modeled for the binary mixtures of difluoromethane (HFC-32) + isobutane and difluoromethane + trans-1,3,3,3-tetrafluoropropene (HFO-1234ze(E)). These mixtures are considered as possible replacements for conventional refrigerants far from negligible global warming potential (GWP). A multifluid approach explicit in the Helmholtz free energy forms the basis of the model. The independent variables are the temperature, density, and composition. Accurate published equations of state for pure HFC-32, isobutane, and HFO-1234ze(E) are incorporated to calculate the Helmholtz free energy of each component. Typical uncertainties of bubble- and dew-point pressures calculated using the model are within 2%. Although adjustable parameters of the model are determined only from experimental VLE data, it is highly probable that the model reasonably predicts other thermodynamic properties such as enthalpy and heat capacities. Therefore, the model allows practical design and simulation of refrigeration systems using the mixtures as a working fluid.
High pressure isothermal vapor-liquid equilibria of carbon dioxide+1,1-difluoroethane
임종성,강정원,Ah Ram Kim 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.1
Vapor-liquid equilibrium data for the binary mixture of carbon dioxide (CO2)+1,1-difluoroethane (HFC-152a) were measured at five evenly spaced temperatures of (273.15, 283.15, 293.15, 303.15 and 313.15) K by using a circulation-type equilibrium apparatus in which both vapor and liquid phases were recirculated. The experimental data were correlated with the Peng-Robinson equation of state (PR-EoS) using the Wong-Sandler mixing rules combined with the NRTL excess Gibbs free energy model and the Carnahan-Starling-DeSantis equation of state (CSD EoS). Almost all the calculated values with these two models showed good agreement with the experimental data.
Vapor-liquid equilibrium in low pressure water+congener mixtures
Claudio Alonso Faúndez,Felipe Andrés Urbina,José Omar Valderrama 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.5
Vapor-liquid equilibrium in binary water+congeners mixtures found in alcoholic distillation has been analyzed using the Peng-Robinson equation of state and one of the most popular modern mixing rules, the Wong-Sandler model. Accurate modeling of the concentration of congeners (substances different from ethanol and water) in the vapor phase is of special importance because these substances give some special characteristics of flavor and aroma to the final distilled spirit and also because their concentrations are regulated by law. In the Wong-Sandler mixing rules the van Laar model for the Gibbs excess energy has been used. The type of model used in this work is commonly used to correlate high pressure phase equilibrium and has not yet been used to treat complex low pressure water+congener mixtures as done in this work. Eight binary water+congeners mixtures have been considered for analysis. Comparison with available literature data is done and the accuracy of the model to correlate the pressure and the vapor phase concentration of the congeners is discussed. It is concluded that the model used is accurate enough for distillation analysis, modeling and simulation.
Breitholtz, A.,Lee, C.S.,Yoo, K.P.,Lim, J.S.,Kang, J.W. Korean Society of Industrial and Engineering Chemi 2010 Journal of industrial and engineering chemistry Vol.16 No.4
Vapor-liquid equilibrium calculations at ambient and elevated pressures were performed using the lattice fluid equation of state with hydrogen bonding (NLF-HB EoS) proposed by You et al. [7,8] and Lee et al. [17]. Vapor-liquid equilibrium calculations composed of typical pure components were compared with electronic experimental database (Dortmund Data Bank). Special attention has been paid to the correction of surface area parameters. Bulkiness factors can be used to modify theoretical surface area parameters for molecules with nonlinear shapes. Empirical bulkiness factors were obtained from liquid density data and VLE data sets with n-hexane chosen as a reference component. Using empirical bulkiness factors, overall prediction performances without binary interaction parameters have been significantly improved. It is shown that the NLF-HB EoS have comparable prediction capability with UNIQUAC method or Peng-Robinson Equation of State only with pure component parameters and component-type-dependent hydrogen-bonding energy parameters for most systems considered in this study.
Vapor-liquid equilibrium of ethanol/ethyl acetate mixture in ultrasonic intensified environment
Taha Mahdi,Arshad Ahmad,Adnan Ripin,Mohamed Mahmoud Nasef 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.5
A vapor-liquid equilibrium (VLE) study was conducted on ethanol/ethylacetate mixture as a preliminarystep towards developing an ultrasonic-assisted distillation process for separating azeotropic mixtures. The influenceof ultrasonic intensity and frequency on the vapor-liquid equilibrium (VLE) of the mixture was examined using a combinationof four ultrasonic intensities in range of 100-400W/cm2 and three frequencies ranging from 25-68 kHz. Thesonication was found to have significant impacts on the VLE of the system as it alters both the relative volatility andazeotrope point, with preference to lower frequency operation. A maximum relative volatility of 2.32 was obtainedat an intensity of 300 W/cm2 and a frequency of 25 kHz coupled with complete elimination of ethanol-ethyl acetateazeotrope. Results from this work were also congruent with some experimental and theoretical works presented in theliterature. These findings set a good beginning towards the development of an ultrasonic assisted distillation that iscurrently in progress.
김화용,Seonghoon Hyeong,Sunghyun Jang,이갑수 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.2
Isothermal vapor liquid equilibria for the binary system of ethylene glycol monopropyl ether with 2,2-dimehylbutane and 2,3-dimethylbutane were measured in a circulating water bath at 303.15, 318.15, and 333.15 K. The apparatus was in-house designed and manufactured. Consistency testing of the apparatus was done by comparing the measured vapor pressures to the calculated vapor pressures from the Antoine equation. The measured systems were correlated with a Peng-Robinson equation of state (PR) combined with Wong-Sandler mixing rule for the vapor phase,and NRTL, UNIQUAC, and Wilson activity coefficient models for the liquid phase. All the measured systems showed good agreement with the correlation results.
Alexander Breitholtz,Chul Soo Lee,유기풍,임종성,Jeong Won Kang 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.4
Vapor–liquid equilibrium calculations at ambient and elevated pressures were performed using the lattice fluid equation of state with hydrogen bonding (NLF-HB EoS) proposed by You et al. [7,8] and Lee et al. [17]. Vapor–liquid equilibrium calculations composed of typical pure components were compared with electronic experimental database (Dortmund Data Bank). Special attention has been paid to the correction of surface area parameters. Bulkiness factors can be used to modify theoretical surface area parameters for molecules with nonlinear shapes. Empirical bulkiness factors were obtained from liquid density data and VLE data sets with n-hexane chosen as a reference component. Using empirical bulkiness factors, overall prediction performances without binary interaction parameters have been significantly improved. It is shown that the NLF-HB EoS have comparable prediction capability with UNIQUAC method or Peng–Robinson Equation of State only with pure component parameters and component-type-dependent hydrogen-bonding energy parameters for most systems considered in this study.
Alireza Fazlali,Parvaneh Koranian,Reza Beigzadeh,Masoud Rahimi 한국화학공학회 2013 Korean Journal of Chemical Engineering Vol.30 No.9
A feed forward three-layer artificial neural network (ANN) model was developed for VLE prediction of ternary systems including ionic liquid (IL) (water+ethanol+1-butyl-3- methyl-imidazolium acetate), in a relatively wide range of IL mass fractions up to 0.8, with the mole fractions of ethanol on IL-free basis fixed separately at 0.1,0.2, 0.4, 0.6, 0.8, and 0.98. The output results of the ANN were the mole fraction of ethanol in vapor phase and the equilibrium temperature. The validity of the model was evaluated through a test data set, which were not employed in the training case of the network. The performance of the ANN model for estimating the mole fraction and temperature in the ternary system including IL was compared with the non-random-two-liquid (NRTL) and electrolyte non-randomtwo-liquid (eNRTL) models. The results of this comparison show that the ANN model has a superior performance in predicting the VLE of ternary systems including ionic liquid.