Thermodynamic and structural analyses and mechanisms of the crystallisation of multi-alkane model mixtures similar to petroleum cuts

Briard, Anne-Julie; Bouroukba, M.; Petitjean, D.; Hubert, Nathalie; Moïse, Jean-Charles; Dirand, M.

doi:10.1016/j.fuel.2005.07.020

Cited by 18 publications

(16 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In brief, the deviation occurs in the heavy Cn part near the WAT, and thus a possible explanation can be the neglect of the rotator phase’s existence. According to the experimental result of Briard et al, the rotator phase indeed exists near the WAT, so eq should have been used to calculate the fugacity ratio. However, for simplicity, the rotator phase is assumed to be passed during the crystallization process, and eq is used, adding an extra term, .…”

Section: Results and Discussionmentioning

confidence: 99%

“…The mathematical form of the correlation formula is essential, which determines whether the model has a good predictive performance and whether the parameters of the correlation formula can be computed by regression. In addition, most published nonideality models can only provide one or two solid solutions in the solid phase, which are incompatible with the experimental phenomenon observed by Briard et al, 23 in which C 19 −C 36 to C 15 −C 36 series are in the three-phase solid thermodynamic state and C 14 −C 36 , the four-phase state. We desire that the new parametrization possesses the capability to predict potential multiple solid solutions in the solid phase.…”

Section: Introductionmentioning

confidence: 89%

“…For multi-Cn mixtures, the orthorhombic (O p by Mondieig et al or β′ by Dirand et al) phase seems to be the only stable ordered phase in the wax at a low temperature independent of the number of Cn. The rotator phase exists on a narrow range of temperatures just below the wax appearance temperature (WAT) . The reason that the orthorhombic phase is the only ordered phase could be explained by its minimum Gibbs free energy, and a more detailed description will be shown in section .…”

Section: Thermodynamics Modelmentioning

confidence: 99%

“…The reason that the orthorhombic phase is the only ordered phase could be explained by its minimum Gibbs free energy, and a more detailed description will be shown in section . Two groups of multi-Cn mixtures, commonly known by the industries and commercial fields, can be identified by the distribution of the molar fraction: (i) a normal logarithmic type forming a single solid solution when wax appears and (ii) a decreasing exponential type forming more than one solid solution determined by the number of Cn in the feed. ,, In thermodynamic modeling, the solid phase of a multi-Cn mixture can be simplified as the orthorhombic phase, the nonideality description of which is available from the o-r transition in binary mixtures.…”

Section: Thermodynamics Modelmentioning

confidence: 99%

See 3 more Smart Citations

New Predictive Nonrandom Two Liquid Equation for Solid–Liquid Phase Equilibrium in n-Alkanes Mixture with Multiple Solid Solutions

Wang

Bai

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

In this work, a predictive nonrandom two-liquid (NRTL) equation analyzed from binary experimental data is proposed to model the solid–liquid equilibrium in the n-alkanes mixture. The predictive NRTL describes the nonideality of the ordered solid phase, whose binary interaction parameters are obtained from a correlation formula. The mathematical form of the correlation formula is summarized from the relationship between the excess Gibbs free energy and the carbon number mismatch parameter in binary mixtures. The coefficients of the correlation formula are regressed from binary experimental data. With this model, it is possible to provide ordered-rotator solid transition phase diagrams with complete or partial miscibility. The crystallization behaviors of nine mixtures are also used to test the model, indicating adequate accuracy. Furthermore, the predictive NRTL can predict potential multiple solid solutions, whose number is changeable with the n-alkanes range of the feed, and the concentration of each solid solution is a normal distribution.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

Section: Thermodynamics Modelmentioning

confidence: 99%

Section: Thermodynamics Modelmentioning

confidence: 99%

See 2 more Smart Citations

New Predictive Nonrandom Two Liquid Equation for Solid–Liquid Phase Equilibrium in n-Alkanes Mixture with Multiple Solid Solutions

Wang

Bai

et al. 2019

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Furthermore, Table comprises refractive indices of the thermotropic additives below (at 29°C) and above the phase transition temperature. Solid phase transitions and subsequent melting upon increasing temperature were detected for additives A1, A5, A6, A8, and A10. Melting of two polymorphs with recrystallization between these melting processes were evident for additive A4 .…”

Section: Resultsmentioning

confidence: 99%

Thermotropic glazings for overheating protection. I. Material preselection, formulation, and light‐shielding efficiency

Weber

Resch

2013

J of Applied Polymer Sci

View full text Add to dashboard Cite

This article presents a systematic strategy for formulation and optimization of thermotropic layers for overheating protection purposes. Specifically, thermotropic systems with fixed domains (TSFD) which consist of a thermotropic additive finely dispersed in a matrix material are considered. Based on systematic material (component) preselection regarding thermoanalytical characteristics and refractive indices, numerous thermotropic layers were formulated. TSFD with thermoplastic matrix were produced by compounding and compression molding. TSFD with resin matrix were produced by UV curing. The thermotropic layers were analyzed as to solar optical properties, threshold temperature, switching process and residual transmittance in the opaque state applying UV/Vis/ NIR spectrometry equipped with a heating stage. Best performing materials exhibited solar hemispheric transmittance in the range of 72.2-84.5% and between 59.6 and 83.7% in the clear and opaque state, respectively. Threshold temperatures between 45 and 75 C were realized. Refractive index difference between matrix and additive and solar hemispheric transmittance displayed a close correlation. Hence, refractometry was shown to be an appropriate tool for material preselection. Furthermore, investigations revealed a close correlation of thermal transitions of thermotropic additives recorded by differential scanning calorimetry and threshold temperatures of thermotropic layers formulated therewith. However, thermotropic layers formulated so far have to be optimized with respect to light-shielding performance for efficient overheating protection.

show abstract

Role of Paraffinic Hydrocarbons in the Formation of the Dispersed Structure of Petroleum Asphalt

Frolov

Firsin

2016

Chem Technol Fuels Oils

View full text Add to dashboard Cite

Thermodynamic and structural analyses and mechanisms of the crystallisation of multi-alkane model mixtures similar to petroleum cuts

Cited by 18 publications

References 35 publications

New Predictive Nonrandom Two Liquid Equation for Solid–Liquid Phase Equilibrium in n-Alkanes Mixture with Multiple Solid Solutions

New Predictive Nonrandom Two Liquid Equation for Solid–Liquid Phase Equilibrium in n-Alkanes Mixture with Multiple Solid Solutions

Thermotropic glazings for overheating protection. I. Material preselection, formulation, and light‐shielding efficiency

Role of Paraffinic Hydrocarbons in the Formation of the Dispersed Structure of Petroleum Asphalt

Contact Info

Product

Resources

About