Isothermal VLE Measurements for Difluoromethane + Dimethyl Ether and an Evaluation of Hydrogen Bonding

Fedele, Laura; Bobbo, Sergio; Stefani, Vania De; Camporese, Roberto; Stryjek, Roman

doi:10.1021/je049789+

Cited by 17 publications

(9 citation statements)

References 21 publications

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“…Comparison of published vapor pressures [dev = p σ – p σ,cal ] with values calculated with eq (this work), derived from experimental U (2) increments: purple ▲, Wu and Yin; red ■, Corvaro et al; blue ◀, Ihmels and Lemmon; green ▶, Valtz et al; purple ★, Kennedy et al; green ◆, Fedele et al; green ∗, Bobbo et al; + , Daiguji and Hihara; maroon , Wu and Yin; aqua ---, Ihmels and Lemmon …”

Section: Resultsmentioning

confidence: 99%

Heat Capacity of Saturated and Compressed Liquid Dimethyl Ether at Temperatures from (132 to 345) K and at Pressures to 35 MPa

Magee

2018

J. Chem. Eng. Data

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Molar heat capacities at constant volume (C v ) of dimethyl ether have been measured with an adiabatic calorimeter. Temperatures range from the triple point to 345 K, and pressures up to 35 MPa. Measurements were conducted on liquid in equilibrium with its vapor and on compressed liquid samples. The samples are of high purity, as verified by chemical analysis. Calorimetric quantities are reported for the two-phase (C v (2) ), saturatedliquid (C σ or C x ′), and single-phase (C v ) molar heat capacities. Low temperature C v(2) data were employed to estimate vapor pressures for values less than 340 kPa by applying a thermodynamic relationship between the two-phase internal energy U (2) and the temperature derivatives of the vapor pressure. Vapor pressures were calculated at temperatures as low as the triple-point temperature. The principal sources of uncertainty are the temperature rise measurement and the change-of-volume work adjustment. The expanded relative uncertainty (with a coverage factor k = 2 and thus a two-standard deviation estimate) is estimated to be 0.7% for C v , 0.5% for C v (2) , and 0.7% for C σ .

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Section: Resultsmentioning

confidence: 99%

Heat Capacity of Saturated and Compressed Liquid Dimethyl Ether at Temperatures from (132 to 345) K and at Pressures to 35 MPa

Magee

2018

J. Chem. Eng. Data

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“…In the fitting procedure, the critical pressure was fixed to be P c =5370.2 kPa [9]. The analysis of the recent literature showed that a total of 11 data sources are available [10][11][12][13][14][15][16][17][18][19][20]. The experimental results were also compared with the published data in the literature.…”

Section: Resultsmentioning

confidence: 99%

PVT properties of an alternative biofuel: dimethyl ether

Arteconi

Nicola

Moglie

et al. 2009

J Therm Anal Calorim

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Dimethyl ether is an important chemical material and it has many engineering applications. It is a clean and economical alternative fuel and an ozone-friendly refrigerant. In this work, its PVT properties have been object of study. In particular, the experimental work was performed both in the two-phase region and in the superheated vapor region phase by means of the isochoric method. The isochoric measurements were carried out at temperatures from 219 K to 363 K and at pressures from 22 kPa up to 1,740 kPa. A total of 159 points, both in the two phase (71 points) and in the superheated vapor region (88 points) were obtained. The present experimental PVT data contribute to the deeper knowledge of the behaviour of the fluid both in the superheated vapour and in the saturation pressure region and to the development of a new equation of state

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“…The reliability test is needed for the experimental data because of the errors caused by many reasons. , According to the chemical thermodynamics, the variables of T , P , x , y of any system are restricted by the phase rule and the activity coefficient can be linked to them. Therefore, the reliability of experimental data can be checked by the general formula of thermodynamics and the basic formula is activity coefficient form of the Gibbs–Duhem equation .…”

Section: Experimental Data and Discussionmentioning

confidence: 99%

Experimental Isobaric Vapor Liquid Equilibrium for Binary Systems Diethylene Glycol Dibenzoate + Diethylene Glycol, Diethylene Glycol Dibenzoate + Octyl Benzoate, and Ternary System Diethylene Glycol Dibenzoate + Diethylene Glycol + Octyl Benzoate at 1.0152 kPa

Qiu-jie

et al. 2018

J. Chem. Eng. Data

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Diethylene glycol dibenzoate (DEDB) is nowadays considered as one of the most promising environment-friendly plasticizers. Isobaric vapor–liquid equilibrium (VLE) data were measured for the binary systems diethylene glycol dibenzoate (DEDB) (1) + diethylene glycol (2), DEDB (1) + octyl benzoate (2) and ternary system DEDB (1) + diethylene glycol (2) + octyl benzoate (3) at 1.0152 kPa using a modified Othmer still, which enriched the basic data for DEDB. The UNIFAC model, Wilson model, and NRTL model were used to predict the VLE data of the binary and ternary systems. The comparison reveals that on average the most accurate VLE predictions are obtained with the NRTL model.

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Isothermal VLE Measurements for Difluoromethane + Dimethyl Ether and an Evaluation of Hydrogen Bonding

Cited by 17 publications

References 21 publications

Heat Capacity of Saturated and Compressed Liquid Dimethyl Ether at Temperatures from (132 to 345) K and at Pressures to 35 MPa

Heat Capacity of Saturated and Compressed Liquid Dimethyl Ether at Temperatures from (132 to 345) K and at Pressures to 35 MPa

PVT properties of an alternative biofuel: dimethyl ether

Experimental Isobaric Vapor Liquid Equilibrium for Binary Systems Diethylene Glycol Dibenzoate + Diethylene Glycol, Diethylene Glycol Dibenzoate + Octyl Benzoate, and Ternary System Diethylene Glycol Dibenzoate + Diethylene Glycol + Octyl Benzoate at 1.0152 kPa

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