Results 81 to 90 of about 262 (112)

PVTx and Isochoric Heat Capacity Measurements for Aqueous Methanol Solutions

International Journal of Thermophysics, 2003
Isochoric heat capacity and PVTx properties of an aqueous methanol solution (0.50 mass fraction or 0.36 mole fraction of methanol) were measured in the liquid phase with a twin-cell adiabatic calorimeter. Temperatures ranged from 333 to 422 K, and pressures ranged to 20 MPa.
M. M. Aliev, J. W. Magee, I. M. Abdulagatov   +2 more
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Modeling the PVTx Behavior of the N-Methylpyrrolidinone/Water Mixed Solvent

Industrial & Engineering Chemistry Research, 2004
An experimental setup for the measurement of densities for the compressed liquid phase of the N-methylpyrrolidinone/water binary solvent from 278.15 to 358.15 K over the full composition range and for pressures up to 60 MPa is reported. Experimental measurements were performed with a recently developed high-pressure vibrating-tube densitometer; the ...
Begoña García, Santiago Aparicio, Rafael Alcalde, María J. Dávila, José M. Leal   +4 more
openaire   +1 more source

A small-volume PVTX system for broadband spectroscopic calibration of downhole optical sensors

Review of Scientific Instruments, 2017
An instrument is presented that is capable of measuring the optical spectrum (long-wave ultraviolet through short-wave mid-infrared) of fluids under a range of temperature and pressure conditions from ambient pressure up to 138 MPa (20 000 psi) and 422 K (300 °F) using ∼5 ml of fluid. Temperature, pressure, and density are measured in situ in real-time,
Christopher Michael, Jones, Michael T, Pelletier, Robert, Atkinson, Jing, Shen, Jeff, Moore, Jimmy, Anders, David L, Perkins, Michael L, Myrick   +7 more
openaire   +2 more sources

PVTx properties in the gas phase for binary R-125/143a system

Fluid Phase Equilibria, 1998
Abstract The mixture of pentafluoroethane (R-125) and 1,1,1-trifluoroethane (R-143a) is a promising alternative for the conventional refrigerant R-502. In this paper, we present 220 PVTx property measurements of this binary system along four isopleths in the gas phase which were performed by an established Burnett apparatus.
Heng-Liang Zhang, Satoru Tada, Haruki Sato, Koichi Watanabe   +3 more
openaire   +1 more source

Gaseous pVTx measurements for (HFC134a + HC290) by a compact single-sinker densimeter

The Journal of Chemical Thermodynamics, 2015
Abstract Comprehensive gaseous pVTx measurements for {1,1,1,2-tetrafluoroethane (HFC134a) + propane (HC290)} were carried out by a compact single-sinker densimeter, based on the Archimedes’ buoyancy principle, at temperatures from (258 to 294) K, pressures up to 0.86 MPa, and mole fractions of HFC134a from (0.2391 to 0.7989).
Haiyang Zhang, Maoqiong Gong, Huiya Li, Hao Guo, Xueqiang Dong, Jianfeng Wu   +5 more
openaire   +1 more source

PVTx Properties of Gaseous Mixtures of Difluoromethane and 1,1,1,2,3,3,3-Heptafluoropropane

Journal of Chemical & Engineering Data, 2007
Mixtures of difluoromethane (HFC-32) and 1,1,1,2,3,3,3-heptafluoropropane (HFC-227ea) are promising alternative refrigerants; however, there is currently no available published experimental PVTx data. The gaseous PVTx properties of HFC-32 (1) + HFC-227ea (2) mixtures were measured using the Burnett-isochoric method with 251 data sets obtained for ...
Xiao-Juan Feng, Yuan-Yuan Duan, Wei Dong
openaire   +1 more source

PVTx measurements for H2O+D2O mixtures in the near-critical and supercritical regions

The Journal of Supercritical Fluids, 2003
Abstract The PVTx relationships of H 2 O+D 2 O mixtures were measured in the near-critical and supercritical regions. Measurements were made using a constant-volume piezometer immersed in a precision thermostat. The volume of the piezometer V PT was corrected for both temperature and pressure expansions.
Akhmed R Bazaev, Ilmutdin M Abdulagatov, Joseph W Magee, Emil A Bazaev, Asbat E Ramazanova   +4 more
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Experimental Determination of PVTX Relations of Fluids in the Diamond-Anvil Cell

Mineralogical Magazine, 1994
PVTX relations of geological fluids are of primary importance to many geological applications. However, accurate experiments performed above 6 kbar and 800~ are scarce, and therefore, uncertainties arise when different versions of equation of state (EOS) are used to extrapolate.
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Liquid phase PVTx properties of carbon tetrachloride-octamethylcyclotetrasiloxane binary mixtures

Journal of Chemical & Engineering Data, 1976
Measurements are reported for the compressions of pure carbon tetrachloride, octamethylcyclotetrasiloxane, and three of their mixtures from atmospherlc to near freezing pressures at temperatures from 273 to 413 K. Nine isothermal equations of state were tested for precision in description of the data.
Montford S. Benson, Jack Winnick
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Synthetic fluid inclusions: IX. Critical PVTX properties of NaCl-H2O solutions

Geochimica et Cosmochimica Acta, 1989
Critical PVTX properties of NaCl-H2O fluids having compositions of 0–30 wt% NaCl have been determined using the synthetic fluid inclusion technique. Critical temperatures and pressures increase from 374.1°C and 220 bars for pure H2O, to 820°C and 1574 bars for 30.0 wt% NaCl.
C.L Knight, R.J Bodnar
openaire   +1 more source