Dew and Frost Points Measurements and Estimation for Residual Gases in High-Pressure Hydrogen

2011 ◽  
Author(s):  
Kenji Ishida ◽  
Masataka Kosaka ◽  
Masanori Monde
Keyword(s):  
High Pressure ◽  
Measurement System ◽  
Estimation Procedure ◽  
Test Cell ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Visible Image ◽  
Present Measurement ◽  
Frost Point ◽  
Point Data

Dew and frost points estimation procedure for phase equilibrium systems with solid phases as condensed phases was developed utilizing Peng-Robinson equation of state (PR-EOS), and estimation for H2+H2O systems corresponding to actual hydrogen stations of pressure up to 70 MPa were carried out. It became clear that condensable components in hydrogen stations were only water. Dew and frost point measurement system with high pressure test cell utilizing cooled mirror technique with original visible image analysis were designed and produced. The system was designed available for frost point temperature below −50 °C, and total pressure of system up to 10 MPa. Pressure tight test cell with view port was installed separately from the optics, and had extensible design available for higher pressure experiments up to 40 MPa. Dew and frost points measurements with several compositions of H2+H2O standard gases were carried out. Frost point data obtained by the present measurement system with pressure tight test cell had good repeatability, and obtained binary interaction parameter kij was small value with the negative sign for about 5 MPa, 50 ppm conditions.

scholarly journals Modelling Sorption Thermodynamics and Mass Transport of n-Hexane in a Propylene-Ethylene Elastomer

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1157
Author(s):  
Daniele Tammaro ◽  
Lorenzo Lombardi ◽  
Giuseppe Scherillo ◽  
Ernesto Di Maio ◽  
Navanshu Ahuja ◽  
...  
Keyword(s):  
Mass Transport ◽  
Interaction Parameter ◽  
Sorption Isotherms ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Theoretical Interpretation ◽  
Sorption Behavior ◽  
Solvent Mixtures ◽  
Random Lattice ◽  
Hexane Vapor

Optimization of post polymerization processes of polyolefin elastomers (POE) involving solvents is of considerable industrial interest. To this aim, experimental determination and theoretical interpretation of the thermodynamics and mass transport properties of POE-solvent mixtures is relevant. Sorption behavior of n-hexane vapor in a commercial propylene-ethylene elastomer (V8880 VistamaxxTM from ExxonMobil, Machelen, Belgium) is addressed here, determining experimentally the sorption isotherms at temperatures ranging from 115 to 140 °C and pressure values of n-hexane vapor up to 1 atm. Sorption isotherms have been interpreted using a Non Random Lattice Fluid (NRLF) Equation of State model retrieving, from data fitting, the value of the binary interaction parameter for the n-hexane/V8880 system. Both the cases of temperature-independent and of temperature-dependent binary interaction parameter have been considered. Sorption kinetics was also investigated at different pressures and has been interpreted using a Fick’s model determining values of the mutual diffusivity as a function of temperature and of n-hexane/V8880 mixture composition. From these values, n-hexane intra-diffusion coefficient has been calculated interpreting its dependence on mixture concentration and temperature by a semi-empiric model based on free volume arguments.

scholarly journals High-pressure cloud point data for the system glycerol + olive oil + n-butane + AOT

2008 ◽  
Vol 25 (3) ◽  
pp. 563-570 ◽  
Author(s):  
J. P. Bender ◽  
A. Junges ◽  
E. Franceschi ◽  
F. C. Corazza ◽  
C. Dariva ◽  
...  
Keyword(s):  
High Pressure ◽  
Olive Oil ◽  
Cloud Point ◽  
Point Data

Development of Heat Capacity Measurement System under High Pressure

2007 ◽  
Vol 46 (5A) ◽  
pp. 3090-3095 ◽  
Author(s):  
Fumiaki Tomioka ◽  
Izuru Umehara ◽  
Takashi Ono ◽  
Masato Hedo ◽  
Yoshiya Uwatoko ◽  
...  
Keyword(s):  
Heat Capacity ◽  
High Pressure ◽  
Measurement System ◽  
Heat Capacity Measurement ◽  
Capacity Measurement

Influence of Equation-of-States on Supercritical CO2 Combustion

2020 ◽  
Author(s):  
K. R. V. (Raghu) Manikantachari ◽  
Scott M. Martin ◽  
Ramees K. Rahman ◽  
Carlos Velez ◽  
Subith S. Vasu
Keyword(s):  
Supercritical Co2 ◽  
Carbon Capture ◽  
Flame Structure ◽  
Compressibility Factor ◽  
Operating Conditions ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Combustion Modeling ◽  
Equation Of States ◽  
Supercritical Combustion

Abstract Fossil fuel based direct-fired supercritical CO2 (sCO2) cycles are gaining the attention of industry, academia and government due to their remarkable efficiency and carbon capture at high-source temperatures. Modeling plays an important role in the development of sCO2 combustors because experiments are very expensive at the designed operating conditions of these direct-fired cycles. Inaccurate density estimates are detrimental to the simulation output. Hence, this work focuses on comprehensive evaluation of the influence and applicability various equation-of-states (EOS) which are being used in the supercritical combustion modeling literature. A state-of-the-art supercritical combustion modeling methodology is used to simulate counter-flow supercritical CO2 flames by using various equation-of-states. The results show that, using the corresponding state principle to evaluate compressibility factor is not accurate. Also, van der Waal type EOSs predictions can be as accurate as complex Benedict-Webb-Rubin EOSs; hence van der Waal EOSs are more suitable to simulate sCO2 combustor simulations. Non-ideal effects are significant under the operating conditions considered in this work. The choice of EOS significantly influences the flame structure and heat release rate. Also, assuming the binary interaction parameter as zero is reasonable in sCO2 combustion simulations.

Phase Behavior and Physical Properties of Dimethyl Ether/Water/Heavy-Oil Systems Under Reservoir Conditions

SPE Journal ◽  
2021 ◽  
pp. 1-17
Author(s):  
Desheng Huang ◽  
Ruixue Li ◽  
Daoyong Yang
Keyword(s):  
Physical Properties ◽  
Phase Behavior ◽  
Dimethyl Ether ◽  
Heavy Oil ◽  
Partition Coefficients ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Translation Strategy ◽  
Wide Range ◽  
Oil Mixtures

Summary Phase behavior and physical properties including saturation pressures, swelling factors (SFs), phase volumes, dimethyl ether (DME) partition coefficients, and DME solubility for heavy-oil mixtures containing polar substances have been experimentally and theoretically determined. Experimentally, novel phase behavior experiments of DME/water/heavy-oil mixtures spanning a wide range of pressures and temperatures have been conducted. More specifically, a total of five pressure/volume/temperature (PVT) experiments consisting of two tests of DME/heavy-oil mixtures and three tests of DME/water/heavy-oil mixtures have been performed to measure saturation pressures, phase volumes, and SFs. Theoretically, the modified Peng-Robinson equation of state (EOS) (PR EOS) together with the Huron-Vidal mixing rule, as well as the Péneloux et al. (1982)volume-translation strategy, is adopted to perform phase-equilibrium calculations. The binary-interaction parameter (BIP) between the DME/heavy-oil pair, which is obtained by matching the measured saturation pressures of DME/heavy-oil mixtures, works well for DME/heavy-oil mixtures in the presence and absence of water. The new model developed in this work is capable of accurately reproducing the experimentally measured multiphase boundaries, phase volumes, and SFs for the aforementioned mixtures with the root-mean-squared relative error (RMSRE) of 3.92, 9.40, and 0.92%, respectively, while it can also be used to determine DME partition coefficients and DME solubility for DME/water/heavy-oil systems.

Influence of Equation-of-States on Supercritical CO2 Combustion Mixtures

2020 ◽  
Vol 143 (6) ◽  
Author(s):  
K.R.V. (Raghu) Manikantachari ◽  
Ramees K. Rahman ◽  
Scott M. Martin ◽  
Carlos Velez ◽  
Subith S. Vasu
Keyword(s):  
Supercritical Co2 ◽  
Carbon Capture ◽  
Flame Structure ◽  
Compressibility Factor ◽  
Operating Conditions ◽  
Binary Interaction ◽  
Binary Interaction Parameter ◽  
Combustion Modeling ◽  
Equation Of States ◽  
Supercritical Combustion

Abstract Fossil fuel based direct-fired supercritical CO2 (sCO2) cycles are gaining the attention of industry, academia, and government due to their remarkable efficiency and carbon capture at high-source temperatures. Modeling plays an important role in the development of sCO2 combustors because experiments are very expensive at the designed operating conditions of these direct-fired cycles. Inaccurate density estimates are detrimental to the simulation output. Hence, this work focuses on comprehensive evaluation of the influence and applicability of various equation-of-states (EOS) which are being used in the supercritical combustion modeling literature. A state-of-the-art supercritical combustion modeling methodology is used to simulate counter-flow supercritical CO2 flames by using various equation-of-states. The results show that using the corresponding state principle to evaluate compressibility factor is not accurate. Also, van der Waal type EOSs predictions can be as accurate as complex Benedict–Webb–Rubin EOSs; hence van der Waal EOSs are more suitable to simulate sCO2 combustor simulations. Non-ideal effects are significant under the operating conditions considered in this work. The choice of EOS significantly influences the flame structure and heat release rate. Also, assuming the binary interaction parameter as zero is reasonable in sCO2 combustion simulations.

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