Vapor Pressure of Tiracetin, Triethylene Glycol Dinitrate, and Metriol Trinitrate.

Woodman, Alan L.; Adicoff, Arnold

doi:10.1021/je60017a033

Cited by 21 publications

(9 citation statements)

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“…Calorimetric values have recently been determined (11). Enthalpies of vaporization of the remaining esters in Table 1 have been calculated from more recent vapor pressure measurements (4,(12)(13)(14)(15) or estimated (4). Two values of AH, originally reported at higher temperatures have been corrected to 298.15 K using calculated values of Cp(l) and C,(g) (9, 10): glyceryl triacetate (12) ((94.40 f 0.21) kJ mol-I at 301.1 K) and methyl g-octadecenoate (13) (methyl oleate) ((84.5 f 4.2) kJ mol-I at 427 K).…”

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confidence: 99%

Heats of vaporization of esters by the gas chromatography–calorimetry method

Fuchs¹,

Peacock²

1980

Can. J. Chem.

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A recently developed gc–calorimetry procedure involving a combination of gas chromatography and heat of solution measurements has been used to measure heats of vaporization of 17 esters, including methyl 2,2-dimethylpropanoate, butyl acetate, glyceryl triacetate, diethyl phthalate, methyl 9-octadecenoate, and 12 methyl esters of C3- to C15-fatty acids. Comparison with measurements of ΔHv reported in the literature indicates that the gc–calorimetry method often has smaller uncertainties in measurements (0.25 to 1.00 kJ mol−1) and more consistent methylene increments for the series of fatty acid methyl esters. Two of the experimental ΔHv measurements which differ appreciably from recent literature values have been verified by vaporization calorimetry.

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confidence: 99%

Heats of vaporization of esters by the gas chromatography–calorimetry method

Fuchs¹,

Peacock²

1980

Can. J. Chem.

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“…The vapor pressure of triacetin at ambient temperature has been determined in several works. − To complete these data, the triacetin boiling temperature was measured for different pressures between 5 and 70 mmHg. The results are shown in Figure , and as can be observed, the new data followed the trend set by the previous works.…”

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confidence: 99%

“…In the literature, data for compounds such as methyl esters , and glycerol , can be found. In the case of triacetin, the data fall in the usual range of pressures used in the oleochemical industry (10–100 mmHg), − so it is necessary to supplement this information with experimental data obtained in the laboratory. Compounds such as diacetinmonoglycerides, diacetin, and monoacetin have not yet been well studied and are not commercially available as pure mixtures.…”

Section: Introductionmentioning

confidence: 99%

Product Separation after Chemical Interesterification of Vegetable Oils with Methyl Acetate. Part I: Vapor–Liquid Equilibrium

Casas

Ramos

Pérez

2012

Ind. Eng. Chem. Res.

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Chemical interesterification of triglycerides with methyl acetate yields biodiesel and triacetin. This reaction is highly reversible, which implies the presence of intermediate compounds such as diacetinmonoglycerides. In addition, the use of methanolic potassium methoxide as the catalyst causes the appearance of diacetin, monoacetin, and glycerol. Vacuum distillation becomes an interesting alternative for the separation of biodiesel and triacetin. Vapor−liquid equilibrium (VLE) determination requires information related to the vapor pressures of the different compounds and the nonideality of the liquid phase (activity coefficients). The lack of literature information for some compounds was supplemented with experimental data and predictive models for vapor pressure and activity coefficients (UNIFAC and UNIFAC Dortmund). The suitability of using vacuum distillation was evaluated using the Fenske equation and experimental results from a structured packed distillation column. According to the results, removal of diacetinmonoglycerides can be easily accomplished, unlike the elimination of diacetin, monoacetin, and glycerol, which form azeotropes with triacetin.

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“…The vaporization enthalpies reported in the literature are not always adjusted to the reference temperature (298 K). That is why we treated the primary experimental results from refs , , and , using eqs and , and we calculated Δ l g H m (298 K) for the sake of comparison with our results (see Table ). Vaporization enthalpies Δ l g H m (298 K) for 1,2-ethanediol diacetate and 1,2,3-propanetrol triacetate measured in this work are in close agreement with those values from the literature (see Table ).…”

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confidence: 99%

Thermochemical and Ab Initio Studies of Biodiesel Fuel Surrogates: 1,2,3-Propanetriol Triacetate, 1,2-Ethanediol Diacetate, and 1,2-Ethanediol Monoacetate

Verevkin¹,

Emel′yanenko²,

Toktonov³

et al. 2009

Ind. Eng. Chem. Res.

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This work has been undertaken to obtain new thermochemical data for ethanediol and propanetriol acetates and to improve the group contribution methodology for the prediction of the thermodynamic properties of compounds relevant to biodiesel. Standard molar enthalpies of formation in the gaseous state of a series of 1,2-ethanediol monoacetate, 1,2-ethanediol diacetate, and 1,2,3-propanetriol triacetate have been obtained from combustion calorimetry and results from the temperature dependence of the vapor pressure measured by the transpiration method. To verify the experimental data, ab initio calculations of all compounds have been performed. Enthalpies of formation derived from the Gaussian 03 second-order Møller−Plesset (G3MP2) method are in good agreement with the experimental results. The strength of the hydrogen bond in 1,2-ethanediol monoacetate and in 1,2-ethanediol have been obtained using ab initio calculations and the group additivity method.

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Vapor Pressure of Tiracetin, Triethylene Glycol Dinitrate, and Metriol Trinitrate.

Cited by 21 publications

References 0 publications

Heats of vaporization of esters by the gas chromatography–calorimetry method

Heats of vaporization of esters by the gas chromatography–calorimetry method

Product Separation after Chemical Interesterification of Vegetable Oils with Methyl Acetate. Part I: Vapor–Liquid Equilibrium

Thermochemical and Ab Initio Studies of Biodiesel Fuel Surrogates: 1,2,3-Propanetriol Triacetate, 1,2-Ethanediol Diacetate, and 1,2-Ethanediol Monoacetate

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