Binary systems of even-numbered n-alkanes (C2p H4p+2 - C2p+2 H4p+6’ 10 ≤ P ≤ 12)

Achour, Z.; Bourdet, J.B.; Bouroukba, M.; Dirand, M.

doi:10.1051/jcp/1993900325

Cited by 19 publications

(3 citation statements)

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“…Then Hasnaoui et al also highlighted three orthorhombic intermediate phases in the (C 22 /C 24 ) system; Achour et al ,, showed the similarity between the (C 20 /C 22 ) phase diagram of Lüth et al and those of both of the (C 22 /C 24 ) 149,150,152 and (C 24 /C 26 ) systems determined by Achour-Boudjema et al , At the same time, Gerson and Nyburg 24 determined the structure of one of these intermediate phases of the C 24 /C 26 system: orthorhombic space group Bb 2 1 m…”

Section: Model N-alkane Mixturesmentioning

confidence: 92%

“…(1) Binary Mixtures of Consecutive C n 's ( Δ n c ≤ 2). The binary mixtures of C n 's have been the subject of numerous articles. ,,,,− ,,, Many phase diagrams have been presented with an orthorhombic continuous solid solution at room temperature even if the two pure C n 's displayed a ( n c − n c ‘ )/ n c relative gap between the chain lengths of molecules which was too high, according to Kravchenko's rule (Table ), and/or a triclinic or monoclinic phase not compatible with Palatnik and Landau's rule: for instance, (C 18 /C 20 ; C 19 /C 21 ; C 21 /C 23 ; C 22 /C 23 ; C 22 /C 24 ; C 24 /C 26 ; C 30 /C 35 ; C 35 /C 36 ), (C 21 /C 23 ), (C 19 /C 21 ), (C 24 /C 28 ) …”

Section: Model N-alkane Mixturesmentioning

confidence: 99%

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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

209

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: Model N-alkane Mixturesmentioning

confidence: 92%

Section: Model N-alkane Mixturesmentioning

confidence: 99%

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

209

335

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“…The terminal solid solutions, denoted 3'1 and T2, are isostructural with n-tetracosane and n-hexacosane [1,2]. The intermediate phases, denoted I]l', [3" and [$~, are identical to those found in the system n-eieosane (n-CzoH42-n-docosane (n-CzzH46) [3], and n-docosane (n-Cz2H46)-n-tetracosane (n-C24Hs0) [2,4,5]. They are isomorphic with the structure of n-tricosane (n-Cz3H48) and n-pentacosane (n-C25Hs2) […”

Section: Introductionmentioning

confidence: 99%

Variation in enthalpy of the systemn-tetracosane-n-hexacosane as functions of temperature and composition

Achour-Boudjema¹,

Bouroukba²,

Balesdent³

et al. 1997

Journal of Thermal Analysis

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Differential enthalpy analyses were performed on the binary n-alkane system n-C24Hs0-n-C26H54 with a Setaram DSC 111 calorimeter of Tian Calvet type.The measurements provided enthalpy data from 260 to 260 K on n-tetracosane, n-hexacosane and 19 binary mixtures.An analytical expression, derived from the Einstein model, is proposed for every pure phase in its temperature domain, to represent the variation in the enthalpy with temperature.A general expression for the enthalpy as a function of temperature and composition is also given.

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Structural behaviour of n-tetracosane and n-hexacosane mixtures

Achour-Boudjema¹,

Bourdet²,

Petitjean³

et al. 1995

Journal of Molecular Structure

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Binary systems of even-numbered n-alkanes (C_2p H_4p+2 - C_2p+2 H_4p+6’ 10 ≤ P ≤ 12)

Cited by 19 publications

References 0 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

Variation in enthalpy of the systemn-tetracosane-n-hexacosane as functions of temperature and composition

Structural behaviour of n-tetracosane and n-hexacosane mixtures

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