Viscosity and molecular association. Part VI. Association of dihydric alcohols and phenols

Thomas, Leo H.; Meatyard, R.

doi:10.1039/j19660000092

Cited by 29 publications

(8 citation statements)

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“…On the other hand, our data are in a good agreement with the latter authors at higher temperatures; over 380 K up to 460 K (mean average deviation less than 3 %). Above 400 K, the vapor pressures of 1,3-propanediol obtained in this work are in quite good agreement with Thomas and Meatyard values and in excellent agreement with Olson's data . In addition, the enthalpy of vaporization deduced from the experimental results is in a very good agreement with Knauth and Sabbah value determined using a calorimeter (within 1.2 kJ·mol –1 ), as in Table .…”

Section: Resultssupporting

confidence: 88%

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Vapor–Liquid Equilibria of Glycerol, 1,3-Propanediol, Glycerol + Water, and Glycerol + 1,3-Propanediol

et al. 2012

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Vapor−liquid equilibria of two compounds, glycerol (or 1,2,3-propanetriol) and 1,3-propanediol, and two mixtures, glycerol + water and glycerol + 1,3-propanediol, were determined using a static apparatus. The obtained pressure values range from 6 Pa to 45 kPa for the compounds and from (32 to 163) kPa for the mixtures. From the temperature dependence of the vapor pressures, the molar enthalpies of vaporization at the mean temperature of the experimental range were derived from the Clausius−Clapeyron equation. From these results the standard enthalpies of vaporization at T = 298.15 K were calculated. The experimental data of the mixtures were correlated using the nonrandom two-liquid (NRTL) model. ■ INTRODUCTIONPetroleum reserves reduction and the increase of environmentally friendly comportment promote the development of new green energy research. Fatty acid methyl ester, commonly known as biodiesel, is derived from the triglyceride transesterification. The reaction generates glycerol as a byproduct in high quantities (1 mole of glycerol for every 3 moles of methyl esters synthesized, about 10 wt % of the total product). Glycerol valorization is crucial for the viability of biodiesel plant. One way for glycerol valorization could be its transformation in 1,3-propanediol which is a valuable chemical used in polyethylene and polyurethane production. 1−4 The development of the chemical processes (design and optimization) requires knowledge of physicochemical properties such as vapor pressures, the boiling point, and the vaporization enthalpy for all of the compounds and mixtures involved in the process. These data are often scarce or not available. So, predictive models such as the universal functional activity coefficient (UNIFAC) are largely used. 5,6 But when the systems present a weak nonideality the obtained results are not reliable. In this work, we were interested in the vapor pressures of two compounds and two mixtures, respectively: glycerol, 1,3-propanediol, water + glycerol, and 1,3-propanediol + glycerol. Experimental results were fitted by the Antoine and Clapeyron equations and compared with the available literature data. The two mixtures were correlated using the nonrandom two-liquid (NRTL) equation. ■ EXPERIMENTAL SECTIONMaterials. Glycerol (or 1,2,3-propanetriol) and 1,3-propanediol were purchased from Aldrich. Their purity was 99 %. Ultrapure water with a resistivity of 18 MΩ·cm, obtained with a Milli-Q system, was used.Apparatus and Procedure. Vapor pressure measurements were carried out using two static apparatuses: "low pressure" and "middle pressure" measurement apparatuses. The low pressure apparatus has been described in several articles, and the details of the experimental procedure can be found elsewhere. 7,8 Shortly, the apparatus is equipped with a differential manometer from MKS, type 670 model 616A, and a Rosemount pressure sensor (model 1151 DPE 22S2). The measurement range of the apparatus is comprised between 0.5 Pa and 200 kPa for the pressure and between 233 K and 463 K for the tem...

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Section: Resultssupporting

confidence: 88%

“…Relative deviation of the experimental vapor pressures of 1,3-propanediol from values obtained with the Antoine equation as a function of temperature T /K: ○, this work; △, ref ; +, ref ; ∗, ref ; □, ref ; ⧫, ref .…”

Section: Resultsmentioning

confidence: 93%

Vapor–Liquid Equilibria of Glycerol, 1,3-Propanediol, Glycerol + Water, and Glycerol + 1,3-Propanediol

et al. 2012

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“…Except for the six hexanols and ethylene glycol, we have the present values therefore serve to extend the previous data previously recorded (14,15) the viscosities, at room temperature to lower temperatures. Although repeat measurements at and upward, of all the materials considered in the present work; overlap temperatures have not been conducted, numerical differentiation (see below) showed that in no case was there any discontinuity between our two sets of data.…”

Section: Methodssupporting

confidence: 85%

“…The physical properties of five (of the six) dihydric alcohol samples have also been previously recorded (15). In general, dihydric alcohols have not been as extensively studied as have the lower monohydric alcohols, but when comparisons can be made, agreement is again satisfactory; thus for propan-1,2-diol, propan-1,3-diol, and 2-methylpentan-2,4-diol, refractive indices at 20 °C agree with literature values to an average 0.0003.…”

Section: Methodsmentioning

confidence: 99%

Viscosity behavior of associated liquids at lower temperatures and vapor pressures

Thomas¹,

Meatyard²,

Smith³

et al. 1979

J. Chem. Eng. Data

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“…The vapor pressures of (±)-1,2-propanediol (see table 1) were studied earlier [19][20][21][22][23][24][25][26], but no enthalpies of vaporization were derived from those literature data in the original works with the exception of Steele et al [24]. Equations (4) and (5) were applied in this work to each available experimental data set in order to obtain enthalpy of vaporization values and to provide a consistent comparison between literature results and the present work (table 1).…”

Section: Vapour Pressure and Vaporization Enthalpies Of 12-propanediolsmentioning

confidence: 99%

1,2-Propanediol. Comprehensive experimental and theoretical study

Verevkin

Emel′yanenko

Nell³

2009

The Journal of Chemical Thermodynamics

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Viscosity and molecular association. Part VI. Association of dihydric alcohols and phenols

Cited by 29 publications

References 0 publications

Vapor–Liquid Equilibria of Glycerol, 1,3-Propanediol, Glycerol + Water, and Glycerol + 1,3-Propanediol

Vapor–Liquid Equilibria of Glycerol, 1,3-Propanediol, Glycerol + Water, and Glycerol + 1,3-Propanediol

Viscosity behavior of associated liquids at lower temperatures and vapor pressures

1,2-Propanediol. Comprehensive experimental and theoretical study

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