scholarly journals A Fundamental Equation of State for Chloroethene for Temperatures from the Triple Point to 430 K and Pressures to 100 MPa

2022 ◽  
Vol 43 (3) ◽  
Author(s):  
Monika Thol ◽  
Florian Fenkl ◽  
Eric W. Lemmon
Keyword(s):  
Experimental Data ◽  
Equation Of State ◽  
Vinyl Chloride ◽  
Triple Point ◽  
Fundamental Equation ◽  
Maximum Pressure ◽  
Experimental Database ◽  
Point Temperature ◽  
Fundamental Equation Of State ◽  
Triple Point Temperature

AbstractA fundamental equation of state in terms of the Helmholtz energy is presented for chloroethene (vinyl chloride). Due to its fundamental nature, it can be used to consistently calculate all thermodynamic state properties in the fluid region. Based on the underlying experimental database, it is valid from the triple-point temperature 119.31 K to 430 K with a maximum pressure of 100 MPa. In addition to the accurate reproduction of experimental data, correct extrapolation behavior during the development of the equation was attained. This enables the equation to be applied in modern mixture frameworks.

scholarly journals Thermodynamic Properties of Methyl Diethanolamine

2021 ◽  
Vol 43 (1) ◽  
Author(s):  
Tobias Neumann ◽  
Elmar Baumhögger ◽  
Roland Span ◽  
Jadran Vrabec ◽  
Monika Thol
Keyword(s):  
Experimental Data ◽  
Liquid Phase ◽  
Equation Of State ◽  
Thermodynamic Properties ◽  
Speed Of Sound ◽  
Fundamental Equation ◽  
Helmholtz Energy ◽  
Maximum Pressure ◽  
Temperature Range ◽  
Fundamental Equation Of State

AbstractThe homogeneous density of the liquid phase is experimentally investigated for methyl diethanolamine. Data are obtained along five isotherms in a temperature range between 300 K and 360 K for pressures up to 95 MPa. Two different apparatuses are used to measure the speed of sound for the temperatures between 322 K and 450 K with a maximum pressure of 95 MPa. These measurements and literature data are used to develop a fundamental equation of state for methyl diethanolamine. The model is formulated in terms of the Helmholtz energy and allows for the calculation of all thermodynamic properties in gaseous, liquid, supercritical, and saturation states. The experimental data are represented within their uncertainties. The physical and extrapolation behavior is validated qualitatively to ensure reasonable calculations outside of the range of validity. Based on the experimental datasets, the equation of state is valid for temperatures from 250 K to 750 K and pressures up to 100 MPa.

scholarly journals Equation of state to predict the solid-liquid-vapor phase coexistances of pure substances.

2020 ◽  
Vol 66 (5 Sept-Oct) ◽  
pp. 656
Author(s):  
J. M. Marín-García ◽  
A. Romero-Martínez ◽  
F. De J. Guevara-Rodríguez
Keyword(s):  
Equation Of State ◽  
Triple Point ◽  
Input Data ◽  
Acentric Factor ◽  
Point Temperature ◽  
Cubic Equation ◽  
Pure Substances ◽  
Solid Liquid ◽  
Triple Point Temperature ◽  
Liquid Vapor

A non-cubic equation of state is used to predict the solid-liquid, solid-vapor and liquid-vapor coexistences of pure substances. The equation of state is obtained using as input data the critical point, the boiling temperature, the triple point temperature and the acentric factor of the substance. In this work, some examples of phase diagrams predicted with the equation of state are reported in order to show its capabilities. Finally, a database with the parameters for different pure substances is presented.

Speed-of-Sound Measurements and a Fundamental Equation of State for Propylene Glycol

2021 ◽  
Vol 50 (2) ◽  
pp. 023105
Author(s):  
Tim Eisenbach ◽  
Christian Scholz ◽  
Roland Span ◽  
Diego Cristancho ◽  
Eric W. Lemmon ◽  
...  
Keyword(s):  
Equation Of State ◽  
Propylene Glycol ◽  
Speed Of Sound ◽  
Fundamental Equation ◽  
Fundamental Equation Of State

scholarly journals The succinonitrile triple-point standard: a fixed point to improve the accuracy of temperature measurements in the clinical laboratory.

1983 ◽  
Vol 29 (7) ◽  
pp. 1380-1384 ◽  
Author(s):  
B W Mangum
Keyword(s):  
Fixed Point ◽  
Triple Point ◽  
Temperature Scale ◽  
Clinical Laboratory ◽  
Freezing Behavior ◽  
Temperature Measurements ◽  
Point Temperature ◽  
Practical Temperature ◽  
Practical Temperature Scale ◽  
Triple Point Temperature

Abstract In an investigation of the melting and freezing behavior of succinonitrile, the triple-point temperature was determined to be 58.0805 degrees C, with an estimated uncertainty of +/- 0.0015 degrees C relative to the International Practical Temperature Scale of 1968 (IPTS-68). The triple-point temperature of this material is evaluated as a temperature-fixed point, and some clinical laboratory applications of this fixed point are proposed. In conjunction with the gallium and ice points, the availability of succinonitrile permits thermistor thermometers to be calibrated accurately and easily on the IPTS-68.

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