Isothermal Sections of Ternary Mixtures: n-docosane + n-tricosane + n-tetracosane

Nouar, H.; Petitjean, D.; Bouroukba, M.; Dirand, M.

doi:10.1080/10587259908025427

Cited by 18 publications

(18 citation statements)

References 55 publications

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“…53 (2) Ternary, Quaternary, and Quinary Systems. Nouar et al 193,258 showed that the same intermediate solid solutions β′ n and β′′ n are also present in ternary molecular alloys of consecutive C n 's (C 22 /C 23 /C 24 , Figure 15). As a function of the composition at room temperature, singlephase domains are adjacent to two-phase or three-phase regions (Figure 15).…”

Section: ) Binary Mixtures Of Consecutive C N 'S (∆N C E 2)mentioning

confidence: 98%

Normal Alkanes, Multialkane Synthetic Model Mixtures, and Real Petroleum Waxes: Crystallographic Structures, Thermodynamic Properties, and Crystallization

Dirand¹,

Bouroukba²,

Chevallier³

et al. 2002

J. Chem. Eng. Data

212

335

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A general review is presented concerning jointly the crystallographic structures and the solid-solid and solid-liquid transition temperatures and enthalpies in the pure normal alkanes, as well as the structural and thermodynamic behavior of their synthetic binary, ternary, and multinary model mixtures and of real petroleum waxes. A major part of the structural and thermodynamic data of the literature, relative to the pure n-alkanes, are listed from methane up to the alkane with carbon atom number equal to 390. Variation relationships of the crystallographic long c-parameter that corresponds to the periodicity of the molecule layer packing along their axis, melting temperatures, and transition enthalpies are given as a function of the carbon atom number. The study of the literature on the n-alkane mixtures highlights the existence of isostructural binary, ternary, and multinary intermediate solid solutions which can be likened to a single pseudocomponent. This intermediate solid solution is equivalent to a hypothetical pure n-alkane whose carbon atom number is equal to the average carbon atom number of the mixtures. As a result, the solubility of these multinary solid solutions or real multiparaffinic waxes in linear, cyclic, or aromatic light solvents is identical to that of the pure n-alkanes: pseudobinary eutectic crystallization of the model or real wax as a single pseudocomponent on one hand and the light solvent on the other hand.

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Section: ) Binary Mixtures Of Consecutive C N 'S (∆N C E 2)mentioning

confidence: 98%

Normal Alkanes, Multialkane Synthetic Model Mixtures, and Real Petroleum Waxes: Crystallographic Structures, Thermodynamic Properties, and Crystallization

Dirand¹,

Bouroukba²,

Chevallier³

et al. 2002

J. Chem. Eng. Data

212

335

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“…Mixing of n-alkanes generally has a dramatic influence on the polymorphic relationships, in particular, when even (n in Cn is even) alkanes are mixed with odd alkanes. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] In previous papers we have reported on the phase behavior of a number of individual binary systems. [16][17][18][19][20] For these systems all mixed phases were characterized as to their crystallographic properties.…”

Section: Introductionmentioning

confidence: 99%

n-Alkane Binary Molecular Alloys

et al. 2004

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The experimental systems considered in this paper are normal alkanes, in the range from octane to octacosane; and their binary mixtures {(1-x) mol of CnH2n+2 + x mol of Cn′H2n′+2}, with n′ > n, and ∆n ) n′ -n taking the values 1 and 2. The alkanes and their mixtures have a rich, complex polymorphic nature, for the description of which a distinction is made between a high-temperature and a low-temperature domain. The high-temperature domain is occupied by rotator phases, and the low-temperature domain by a variety of mixed crystalline phases, referred to as the "ordered" phases. Experimental phase diagram data for 19 binariessincluding 11 binaries for which original data are presentedsare used to give a uniform and coherent description of the phase relationships for the ensemble of alkane alloys.

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“…The structural analyses carried out by X-ray diffraction at ambient temperature ( T = 294.15 K) 4-8 reveal that all of these commercial and synthetic mixtures form a single solid solution, isostructural to the β‘ ordered intermediate phase of binary and ternary C n alloys. − …”

Section: Synthetic and Commercial Multi-c N Mixtures With C N Mole ...mentioning

confidence: 99%

“…(i) The mixtures of groups 1 and 2 with N ≤ 11 form a single solid phase whose orthorhombic structure is isostructural to the β‘ or β‘ ‘ ordered intermediate phase of binary and ternary C n alloys. − A single periodicity of the molecular layer stacking along the long crystallographic c axis is observed; it corresponds to the mean chain length of a hypothetical orthorhombic odd-numbered C n with a n̄ c number of carbon atoms equal to the n̄ real mean number of carbon atoms of multi-C n mixtures with an excess value close to one carbon atom 5,6 ( n̄ c ≈ n̄ + 1). Thus, all C n 's combine into a single molecular layer: the longer molecules bend to insert themselves between the stacking planes and associate with shorter molecules to obtain a single solid solution with a dense structure.…”

Section: Synthetic Mixtures With C N Mole Fraction Distributions Of ...mentioning

confidence: 99%

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Thermodynamic Properties of Multialkane Synthetic and Real Petroleum Mixtures

Briard¹,

Bouroukba²,

Petitjean³

et al. 2004

J. Chem. Eng. Data

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Measurements of enthalpy increments from the temperature of the ordered phases of low temperatures at 293.4 K up to the liquid phase above the melting point were carried out by differential scanning calorimetry using discontinuous mode temperature programming on 18 multiparaffinic mixtures, prepared by melting pure alkanes, and 4 commercial petroleum waxes. Temperatures and enthalpies of the solid/ solid transitions and melting were determined, as well as the total enthalpy variations from the order/ disorder transition onset temperature up to the melting end temperature and the heat capacity variations in the ordered solid solution and the liquid phase, as a function of temperature. The comparison of the experimental results with the values, calculated for equivalent ideal mixtures from the thermodynamic data of pure n-alkanes, allows us to highlight a deviation in relation to the ideality in the solid state for all of these mixtures: the ordered solid phase reveals a significant gap in relation to ideality, whereas the liquid mixtures show athermal behavior. The composition characteristic parameters of the mixtures (shape of the n-alkane mole fraction distribution, number of n-alkanes, and percentage of the other nonlinear hydrocarbons in the petroleum mixtures) are closely related to the degree of internal disorder in the solid solutions and thus to the deviation in relation to the ideality in the solid state.

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Isothermal Sections of Ternary Mixtures: n-docosane + n-tricosane + n-tetracosane

Cited by 18 publications

References 55 publications

Normal Alkanes, Multialkane Synthetic Model Mixtures, and Real Petroleum Waxes: Crystallographic Structures, Thermodynamic Properties, and Crystallization

Normal Alkanes, Multialkane Synthetic Model Mixtures, and Real Petroleum Waxes: Crystallographic Structures, Thermodynamic Properties, and Crystallization

n-Alkane Binary Molecular Alloys

Thermodynamic Properties of Multialkane Synthetic and Real Petroleum Mixtures

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