scholarly journals BACKONE equation of state for Cis-1, 3, 3, 3-tetrafluoropropene (R1234ze(Z))

2018 ◽  
Vol 40 (4) ◽  
pp. 387-395
Author(s):  
Phan Thi Thu Huong ◽  
Lai Ngoc Anh
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Thermodynamic Properties ◽  
Vapor Pressure ◽  
Characteristic Temperature ◽  
Liquid Density ◽  
Saturated Liquid ◽  
Density Data ◽  
Factor Α ◽  
Saturated Liquid Density

This paper presents the study on the determination of the thermodynamic properties of Cis-1,3,3,3-tetrafluoropropene (R1234ze(Z)) with the BACKONE equation of state. The BACKONE's characteristic temperature T0, characteristic density ρ0, anisotropy factor α, and reduce quarupole moment Q*2 were found by fitting the BACKONE EOS to experimental data of vapor pressure and saturated liquid density. All thermodynamic properties such as vapor pressure, pressure in gaseous phase, saturated liquid density, and liquid density can be determined easily from the found molecular characteristic properties. Thermodynamic properties of the R1234ze(Z) were evaluated with available experimental data. Average absolute deviations between calculated vapor pressure data and experimental data were 0.43%. Average absolute deviations between calculated saturated liquid density data and experimental data were 0.43%. In the prediction of the thermodynamic properties, average absolute deviations between calculated liquid density data and experimental data were 0.68% and average absolute deviations between calculated gas density data and experimental data were 1.6%.

scholarly journals A New Four-Parameter Cubic Equation of State for Predicting Fluid Phase Behavior

2019 ◽  
Author(s):  
zhiren he
Keyword(s):  
Heat Capacity ◽  
Equation Of State ◽  
Vapor Pressure ◽  
Saturated Vapor ◽  
Liquid Density ◽  
Saturated Liquid ◽  
Cubic Equation ◽  
Liquid Heat ◽  
Entropy Of Vaporization ◽  
Saturated Liquid Density

<p>A new four-parameter cubic equation of state (EoS) is generated by incorporating the critical compressibility factor (Z<sub>c</sub>) apart from the critical pressure (P<sub>c</sub>) and temperature (T<sub>c</sub>). One free parameter in the denominator of the attractive term and two parameters in the alpha function are adjusted using the experimental data of saturated liquid density, vapor pressure, and isobaric liquid heat capacity of 48 components including hydrocarbons and non-hydrocarbons. Applying this equation of state, saturated liquid density, saturated vapor density, and vapor pressure of pure components are accurately reproduced compared with experimental values. Furthermore, the predicted properties including derivatives of alpha function, such as enthalpy of vaporization, entropy of vaporization and isobaric heat capacity of liquid, also have decent accuracy. The global average absolute relative deviation (AAD) of saturated liquid density, saturated vapor density, saturated vapor pressure, enthalpy of vaporization, entropy of vaporization, and isobaric heat capacity of liquid in a wide reduced temperature (Tr) range of subcritical region reproduced by this work are 4.33%, 4.18%, 3.19%, 2.26%, 2.27%, and 5.82%, respectively. Substantial improvement has been achieved for the isobaric liquid heat capacity calculation.</p>

scholarly journals A New Four-Parameter Cubic Equation of State for Predicting Fluid Phase Behavior

2019 ◽  
Author(s):  
zhiren he
Keyword(s):  
Heat Capacity ◽  
Equation Of State ◽  
Vapor Pressure ◽  
Saturated Vapor ◽  
Liquid Density ◽  
Saturated Liquid ◽  
Cubic Equation ◽  
Liquid Heat ◽  
Entropy Of Vaporization ◽  
Saturated Liquid Density

<p>A new four-parameter cubic equation of state (EoS) is generated by incorporating the critical compressibility factor (Z<sub>c</sub>) apart from the critical pressure (P<sub>c</sub>) and temperature (T<sub>c</sub>). One free parameter in the denominator of the attractive term and two parameters in the alpha function are adjusted using the experimental data of saturated liquid density, vapor pressure, and isobaric liquid heat capacity of 48 components including hydrocarbons and non-hydrocarbons. Applying this equation of state, saturated liquid density, saturated vapor density, and vapor pressure of pure components are accurately reproduced compared with experimental values. Furthermore, the predicted properties including derivatives of alpha function, such as enthalpy of vaporization, entropy of vaporization and isobaric heat capacity of liquid, also have decent accuracy. The global average absolute relative deviation (AAD) of saturated liquid density, saturated vapor density, saturated vapor pressure, enthalpy of vaporization, entropy of vaporization, and isobaric heat capacity of liquid in a wide reduced temperature (Tr) range of subcritical region reproduced by this work are 4.33%, 4.18%, 3.19%, 2.26%, 2.27%, and 5.82%, respectively. Substantial improvement has been achieved for the isobaric liquid heat capacity calculation.</p>

scholarly journals Modeling the properties of Kukersite shale gasoline

2021 ◽  
Author(s):  
Parsa Mozaffari ◽  
zachariah Steven baird ◽  
oliver järvik
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Vapor Pressure ◽  
Prediction Model ◽  
Boiling Point ◽  
Gasoline Fraction ◽  
Shale Oil ◽  
Property Prediction ◽  
Density Data ◽  
Do So

Based on new experimental data for Kukersite shale oil, it is now possible to develop a property prediction model for the gasoline fraction of shale oil. Such a model was created based on estimation of the composition along with experimental boiling point and density data. First, correlations were developed to estimate the composition of a Kukersite shale gasoline sample based on the boiling point and density of narrow fractions. The estimated composition was then used with the PC-SAFT equation of state to calculate the properties of shale gasoline. To do so, correlations were developed to predict the PC-SAFT parameters of the various classes of compounds present in Kukersite shale gasoline. The utility of this model was shown by predicting the vapor pressure of various portions of the shale gasoline.

scholarly journals Optimization of the quintic equation of the state based model for the calculations of different thermodynamic properties

2008 ◽  
Vol 10 (1) ◽  
pp. 6-10 ◽  
Author(s):  
Antoni Kozioł ◽  
Radosław Wiśniewski
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Thermodynamic Properties ◽  
Saturation Pressure ◽  
The State ◽  
New Method ◽  
Original Form ◽  
Liquid Density ◽  
Temperature Dependent ◽  
Quintic Equation

Optimization of the quintic equation of the state based model for the calculations of different thermodynamic properties Different thermodynamic properties (the vapour density, the liquid density and the saturation pressure) were calculated by the model based on the Nakamura-Breedveld-Prausnitz equation of state (NBP EOS). Since the original form of the NBP EOS often generates inaccurate results for liquids, it was modified to describe this phase better. The calculations were realized in the subcritical region. So far, the temperature-dependent NBP EOS parameters have been obtained by special correlations. Their constants were fitted to a lot of experimental data. In this paper the equation of state temperature-dependent parameters were obtained by a new method which was based at piecewise cubic Hermite interpolating polynomials (PCHIPs). In the proposed method some experimental data (called the key ones) were used, thus reducing the experimental effort. Seven substances were chosen for the test calculations. Each of them is common in industry. The calculation results were compared with the experimental data. The new method has made an accurate description of vapour-liquid equilibrium for the considered pure substances over a wide temperature range possible.

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