Vapor−Liquid Critical Properties of Elements and Compounds. 7. Oxygen Compounds Other Than Alkanols and Cycloalkanols

Kudchadker, Arvind P.; Ambrose, D.; Tsonopoulos, Constantine

doi:10.1021/je0001680

Cited by 74 publications

(70 citation statements)

References 98 publications

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“…As Fig. 6 (left) shows, liquid and vapor thermal-pressure coefficients, γ V and γ V , and first temperature derivatives of the vapor pressure, γ S , intersect (γ V = γ V = γ S ) at the critical density, ρ C = 265.5 kg · m −3 , which is in excellent agreement with the IUPAC [37] recommended value of (264 ± 3) kg · m −3 and with the most reliable reported data (see Table 2). This is a very reliable technique to accurately determine the value of the critical density where γ V = γ V = γ S .…”

Section: Resultssupporting

confidence: 77%

“…The value of the critical pressure (3605 kPa) is Between TDE [28] and DIPPR [21] 0 .37 2.03 10.03 Table 6 Values of the vapor-pressure correlation Eq. 22 parameters, T C = 466.845 K also in acceptable agreement with the reported data and IUPAC recommendation [37], deviation within 1.0 %.…”

Section: Vapor-pressure Equation Of Dee From Isochoric Heat-capacity supporting

confidence: 88%

“…These critical parameters are very close to the values (T C = (466.7±0.1) K, P C = (3644±10) kPa, and ρ C = (264 ± 3) kg · m −3 ) accepted by IUPAC Commission I.2 on Thermodynamics, Subcommittee on Thermodynamic Data by the critical properties group [37]. The hole model group-contribution EOS by Hofman et al [38] predicts the following values of the critical parameters of DEE: T C = 492.4 K, P C = 3040 kPa, and ρ C = 246 kg · m −3 which are considerably different from experimental results.…”

Section: 6supporting

confidence: 78%

“…Usually, the value of the critical density determined from the singular diameter law differs from the value that is obtained from linear extrapolation (from the rectilinear law) by 3 % to 5 %. Thus, the critical density derived in the present work from calorimetric and saturated-density measurements, ρ C = 265.1 kg · m −3 deviates from the IUPAC recommended value [37] by 0.42 %, while the critical temperature (466.845 K) differs by 0.145 K.…”

Section: Critical Parameterscontrasting

confidence: 53%

“…Both γ V and γ S intersect at the critical density of 265.5 kg · m −3 (see detailed view in Fig. 6 (left)) which shows excellent agreement within 0.5 % with IUPAC [37] recommended values, 0.29 % with DIPPR [21] recommendation, and 0.19 % with the value reported by Timmermans [23]. The temperature dependence of γ V and γ S for liquid and vapor branches of the coexistence curve is depicted in Fig.…”

Section: Thermal-pressure Measurementsmentioning

confidence: 53%

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Experimental Study of the Thermodynamic Properties of Diethyl Ether (DEE) at Saturation

et al. 2011

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The isochoric heat capacities C V 1 , C V 1 , C V 2 , C V 2 , saturation densities (ρ S and ρ S ), vapor pressures (P S ), thermal-pressure coefficients γ V = (∂ P/∂ T ) V , and first temperature derivatives of the vapor pressure γ S = (dP S /dT ) of diethyl ether (DEE) on the liquid-gas coexistence curve near the critical point have been measured with a high-temperature and high-pressure nearly constant-volume adiabatic piezocalorimeter. The measurements of (C V 1 , C V 1 , C V 2 , C V 2 ) were made in the liquid and vapor one-and two-phase regions along the coexistence curve. The calorimeter was additionally supplied with a calibrated extensometer to accurately and simultaneously measure the PVT , C V VT , and thermal-pressure coefficient, γ V , along the saturation curve. The measurements were carried out in the temperature range from 416 K to 466.845 K (the critical temperature) for 17 liquid and vapor densities from 212.6 kg · m −3 to 534.6 kg · m −3 . The quasi-static thermo-(reading of PRT, T − τ 123 560 Int J Thermophys (2011) 32:559-595 plot) and baro-gram (readings of the tensotransducer, P − τ plot) techniques were used to accurately measure the phase-transition parameters (P S , ρ S , T S ) and γ V . The total experimental uncertainty of density (ρ S ), pressure (P S ), temperature (T S ), isochoric heat capacities (C V 1 , C V 1 , C V 2 , C V 2 ), and thermal-pressure coefficient, γ V , were estimated to be 0.02 % to 0.05 %, 0.05 %, 15 mK, 2 % to 3 %, and 0.12 % to 1.5 %, respectively. The measured values of saturated caloric C V 1 , C V 1 , C V 2 , C V 2 and saturated thermal (P S , ρ S , T S ) properties were used to calculate other derived thermodynamic properties C P , C S , W, K T , P int , H vap , and (∂ V /∂ T ) P of DEE near the critical point. The second temperature derivatives of the vapor pressure, d 2 P S /dT 2 , and chemical potential, d 2 μ/dT 2 , were also calculated directly from the measured one-and two-phase liquid and vapor isochoric heat capacities (C V 1 , C V 1 , C V 2 , C V 2 ) near the critical point. The derived values of d 2 P S /dT 2 from calorimetric measurements were compared with values calculated from vapor-pressure equations. The measured and derived thermodynamic properties of DEE near the critical point were interpreted in terms of the "complete scaling" theory of critical phenomena. In particular, the effect of a Yang-Yang anomaly of strength R μ on the coexistence-curve diameter behavior near the critical point was studied. Extended scaling-type equations for the measured properties P S (T ), ρ S (T ), and (C V 1 , C V 1 , C V 2 , C V 2 ) as a function of temperature were developed.

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Section: Resultssupporting

confidence: 77%

Section: Vapor-pressure Equation Of Dee From Isochoric Heat-capacity supporting

confidence: 88%

Section: 6supporting

confidence: 78%

Section: Critical Parameterscontrasting

confidence: 53%

Section: Thermal-pressure Measurementsmentioning

confidence: 53%

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Experimental Study of the Thermodynamic Properties of Diethyl Ether (DEE) at Saturation

et al. 2011

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Adjustable QSPRs for prediction of properties of long‐chain substances

2011

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The development of quantitative structure property relationships (QSPRs) with good extrapolation capabilities for high carbon number (n C ) substances in homologous series is considered. Based on the available experimental data, molecular descriptors collinear with a particular property are identified. Among these, the ones whose behavior at the limit n C ! 1 is similar to the properties behavior, are eventually used for prediction. A linear QSPR in terms of the selected descriptor with an optional additional correction term which exponentially decays with n C can be developed. The confidence level in the property prediction can be adjusted to the quantity, precision, and reliability of the available data. The proposed method has been tested by developing QSPRs for predicting T C and P C for several homologous series and T m for the nalkane series. In all cases, the QSPRs developed represent the available experimental data satisfactorily and converge to theoretically accepted values for n C ! 1. V V C 2010 American Institute of Chemical Engineers AIChE J, 57: [423][424][425][426][427][428][429][430][431][432][433] 2011

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