Excess thermodynamic properties of some binary solutions of ethylbenzene + n-alkanes

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

“…All these results 198,199,210 are in agreement with the research work of Chang et al, 206 Arenosa et al, 207 Doman-ska et al, 208,209 Ksiazczak et al, 101 Madsen et al, 211 and Ghogomu et al [202][203][204][205] The liquidus curve (Figure 16) can be calculated by models: the use of the ideal solution model is not appropriate to represent the experimental results, whereas the application of the expression of Buchowski et al, 213 for instance, gives good results for the binary systems C 23 , C 25 , C 26 , or C 28 in C 7 . 199 Moreover, Provost et al 198 have calculated the activity coefficients γ of C 26 and C 28 , in the liquid solution, for the binary systems C 26 /C 7 and C 28 /C 7 , using the standard thermodynamic relationship for equilibrium between a pure solid component and a liquid.…”

“…C n and Light Solvent. Solubility studies of the heavy pure C n 's in light solvents were described in the literature, for instance by Couthino et al, 197 Provost et al, 198,199 Ghogomu et al, [200][201][202][203][204][205] Chang et al, 206 Arenosa et al, 207 Domanska et al, [208][209][210] Ksiazczak et al, 108,121 Madsen and Boistelle, 211 Floter et al, 212 Buchowski et al, 213 and Mahmoud et al 214,215 These binary systems of C n 's, which have a high difference of chain length between the heavy solute and light solvent, respect Kravchenko's rules about their solubility for the solid state and display phase diagrams with no miscibility in the solid phase and eutectic solidification 198,199,208,211 (Figure 16):…”

“…As the crystallization of normal paraffin hydrocarbons in the middle distillate fuels and in petroleum cuts is of significant interest in petroleum technologies, studies have been carried out on the solubilities of pure C n 's and of their synthetic mixtures in organic solvents 121,168,[197][198][199][200][201][202][203][204][205][206][207][208][209][210][211][212][213][214][215][216] and on the structural and thermodynamic properties of model and real multicomponent paraffin waxes in order to seek adequate thermodynamic models to represent the behavior of petroleum cuts. 23,76,77, The aim of this review is to summarize current findings in the literature and to give complementary results obtained in recent years.…”

Variations of Dissolution Enthalpies of Pure n-Alkanes in Heptane as a Function of Carbon Chain Length

“…Indeed, we notice that the dissolution enthalpies of the even-numbered C 2 p 's are located on a straight line which is above that of the odd-numbered C 2 p +1 's, these two lines being parallel. This observation is close to that previously reported by Ghogomu, ,, who has already shown that odd-numbered C 2 p +1 's are more soluble than even-numbered ones. The explanation of that alternating effect lies in the difference of the structures of the low temperature ordered phases according to the carbon atom number parity.…”

Solubility of Some n-Alkanes (C23, C25, C26, C28) in Heptane, Methylcyclohexane, and Toluene

“…(ii) The solubility of heavy pure alkanes (Ghogomu et al, 1997a) and their binary mixtures in organic solvents (Ghogomu et al, 1989(Ghogomu et al, , 1997b. Their results have been recently confirmed by Flo ¨ter et al, 1997. The aim of this work is to determine the solubility of tricosane (denoted C 23 ), pentacosane (denoted C 25 ), hexacosane (denoted C 26 ), and octacosane (denoted C 28 ) in heptane, methylcyclohexane, and toluene.…”