Experimental measurements and thermodynamic modeling ofwax disappearance temperature for the binary systems n -C 14 H 30 + n -C 16 H 34 , n -C 16 H 34 + n -C 18 H 38 and n -C 11 H 24 + n -C 18 H 38

“…It can be seen clearly in Figures 10-12 that the weight percent of alkanes with different carbon numbers in the precipitated solid wax crystals increased as the carbon number increased. The higher the carbon number, the easier each alkane is to precipitate [26]. However, precipitation was also affected by temperature.…”

Section: Composition Distribution Of Solid Waxmentioning

confidence: 99%

Experimental Measurements of Wax Precipitation Using a Modified Method of Simultaneous Centrifugation and High-Temperature Gas Chromatography

Liu

Duan

et al. 2021

Energies

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Wax precipitation and deposition are serious flow assurance problems. Wax precipitation is investigated simultaneously using centrifugation and high-temperature gas chromatography (C-HTGC) to obtain the amount and component distribution of precipitated wax in artificial waxy oil and diesel at different temperatures. However, the conventional C-HTGC method gives upper measurements of the amount of precipitated wax, as it ignores wax dissolved in crude oil in the centrifugal cake. A modified C-HTGC method was developed to obtain the precipitated solid fraction of crude oil, based on the mass balances of the non-crystallized fraction of the centrifuged cake. The weight, percent and carbon number distribution of precipitated solid wax crystals at different temperatures of artificial oil and 0# diesel were obtained. It was found that wax precipitation characteristics are affected by many factors, including the carbon number distribution of the oil, the sensitivity of alkane crystallization to temperature and the temperature of the waxy oil solution. The average carbon number of alkanes in precipitated wax crystals decreases with the decrease in temperature. The distribution of alkanes in solid wax crystals is roughly the same as that in 0# diesel but slightly heavier than in diesel. Alkanes with high carbon numbers precipitate simultaneously with those with low carbon numbers.

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“…The modified UNIQUAC model consists of two parts: a combinatorial part and a residual part. 17 The former is attributed to entropic effects, the size difference, and free volume. The latter is due to the energetic interactions of dissimilar molecules, which lead to the enthalpy of mixing.…”

Section: Thermodynamic Modelmentioning

confidence: 99%

“…However, the differences were quite small, and the prediction results of these models were still in good agreement with each other. Parsa et al 17 investigated a combination of different models, including the ideal solution regular solution theory, Wilson model, predictive UNIQUAC, and UNIFAC models to describe the SLE of paraffin binary systems. The results showed that the wax disappearance temperatures were basically consistent upon using regular solution theory and the ideal model.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measurements and Thermodynamic Modeling of Melting Temperature of the Binary Systems n-C₁₁H₂₄–n-C₁₄H₃₀, n-C₁₂H₂₆–n-C₁₃H₂₈, n-C₁₂H₂₆–n-C₁₄H₃₀, and n-C₁₃H₂₈–n-C₁₅H₃₂ for Cryogenic Thermal Energy Storage

Shen

Peng

Ling

2019

Ind. Eng. Chem. Res.

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In this study, the phase diagrams for the binary systems of n-C11H24–n-C14H30, n-C12H26–n-C13H28, n-C12H26–n-C14H30, and n-C13H28–n-C15H32 were experimentally investigated to employ potential phase change materials (PCMs) for cryogenic applications. Besides, the phase diagrams were theoretically obtained on the basis of the ideal solubility and UNIFAC models, and the UNIQUAC, Wilson, and NRTL models were applied to build correlations between experimental and predicting values. The results show that the compositions of the eutectic points appear at 10 wt % C14 for the C11–C14 system, 17.8 wt % C13 for the C12–C13 system, 18 wt % C14 for the C12–C14 system, and 10 wt % C15 for the C13–C15 system with eutectic temperatures of 246.85, 257.75, 260.45, and 265.55 K, respectively. Moreover, the melting temperatures calculated using the theoretical models are in good agreement with the experimental results. The average relative deviations for the C11–C14 system and C13–C15 systems are merely 0.3814% and 0.3220%, respectively, by using the NRTL model. Simultaneously, the minimum relative deviations for the C12–C13 and C12–C14 binary systems are 0.3649% for the ideal solubility model and 0.4856% for the UNIFAC model. Finally, upon comparing the predicted results of the studied binary systems using the results of the five models, we find that the UNIFAC model provides the most accurate results for the melting temperatures.

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Experimental measurements and thermodynamic modeling ofwax disappearance temperature for the binary systems n -C 14 H 30 + n -C 16 H 34 , n -C 16 H 34 + n -C 18 H 38 and n -C 11 H 24 + n -C 18 H 38

Cited by 11 publications

References 54 publications

Experimental investigation and thermodynamic modeling of wax disappearance temperature for n-undecane+n-hexadecane+n-octadecane and n-tetradecane+n-hexadecane+n-octadecane ternary systems

Experimental investigation and thermodynamic modeling of wax disappearance temperature for n-undecane+n-hexadecane+n-octadecane and n-tetradecane+n-hexadecane+n-octadecane ternary systems

Experimental Measurements of Wax Precipitation Using a Modified Method of Simultaneous Centrifugation and High-Temperature Gas Chromatography

Experimental Measurements and Thermodynamic Modeling of Melting Temperature of the Binary Systems n-C₁₁H₂₄–n-C₁₄H₃₀, n-C₁₂H₂₆–n-C₁₃H₂₈, n-C₁₂H₂₆–n-C₁₄H₃₀, and n-C₁₃H₂₈–n-C₁₅H₃₂ for Cryogenic Thermal Energy Storage

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Experimental measurements and thermodynamic modeling ofwax disappearance temperature for the binary systems n -C 14 H 30 + n -C 16 H 34 , n -C 16 H 34 + n -C 18 H 38 and n -C 11 H 24 + n -C 18 H 38

Cited by 11 publications

References 54 publications

Experimental investigation and thermodynamic modeling of wax disappearance temperature for n-undecane+n-hexadecane+n-octadecane and n-tetradecane+n-hexadecane+n-octadecane ternary systems

Experimental investigation and thermodynamic modeling of wax disappearance temperature for n-undecane+n-hexadecane+n-octadecane and n-tetradecane+n-hexadecane+n-octadecane ternary systems

Experimental Measurements of Wax Precipitation Using a Modified Method of Simultaneous Centrifugation and High-Temperature Gas Chromatography

Experimental Measurements and Thermodynamic Modeling of Melting Temperature of the Binary Systems n-C11H24–n-C14H30, n-C12H26–n-C13H28, n-C12H26–n-C14H30, and n-C13H28–n-C15H32 for Cryogenic Thermal Energy Storage

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Experimental Measurements and Thermodynamic Modeling of Melting Temperature of the Binary Systems n-C₁₁H₂₄–n-C₁₄H₃₀, n-C₁₂H₂₆–n-C₁₃H₂₈, n-C₁₂H₂₆–n-C₁₄H₃₀, and n-C₁₃H₂₈–n-C₁₅H₃₂ for Cryogenic Thermal Energy Storage