Experimental Study of Liquid–Liquid Equilibrium and Thermodynamic Modeling for Systems Containing Alcohols + Biodiesel + Diesel

Bezerra, Jéssyca K. A.; Duarte, Lindemberg J. N.; Oliveira, Humberto Neves Maia de; Medeiros, Gilson Gomes de; Neto, Eduardo Lins de Barros

doi:10.1021/acs.jced.3c00261

Cited by 2 publications

(3 citation statements)

References 53 publications

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“…Machado et al, [30] assessed the estimated parameters of the UNIFAC subgroup for ethanol in predicting the LLE of the biodiesel systems, exhibiting an RMSD of 1.2%. Bezerra et al [15], assessed the stimated parameters of UNIQUAC and NRTL for ternary phase diagrams for LLE of (a) methanol (1) + biodiesel (2) + diesel (3) (system 1) and (b) ethanol (1) + biodiesel (2) + diesel (3) (system 2) at 300.15 K and the results corroborated the data obtained in the present study.…”

Section: Nrtl and Uniquac Modelssupporting

confidence: 89%

“…In the LLE, were used biodiesel produced according to the methodology of Bezerra et al [15]. pure diesel (Nordeste Logística from Guamaré, Brazil) and ethyl alcohol (Dinâmica Química Contemporânea, 99.5%) were diluted at concentrations of 98.5, 97.5, 96.5 and 95.5%.…”

Section: Raw Materialsmentioning

confidence: 99%

“…Bezerra et al [16], obtained distribution coefficient values less than 1 and selectivity greater than 1 for systems containing biodiesel + glycerol + methanol and methyl palmitate + glycerol + methanol. Bezerra et al [15] assessed the use of biodiesel as an additive to stabilize alcohol mixtures in diesel, proposing new formulations based on LLE studies between methanol/ethanol/butanol + biodiesel + diesel, obtaining distribution coefficient values less than 1 and selectivity greater than 1.…”

Section: Distribution Coefficients and Selectivitymentioning

confidence: 99%

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Evaluation Of The Effect Of Ethyl Alcohol Content In A Ternary Ethanol/Biodiesel/Diesel System

Nogueira Duarte,

Medeiros,

De Oliveira

et al. 2024

International Journal of Thermodynamics

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Increasing concern about climate change and the need to reduce dependence on fossil fuels have driven the search for more sustainable energy alternatives. One way to reduce emissions is by adding oxygenated compounds such as biodiesel and alcohols to diesel fuel. However, this can lead to phase separation between the fuels and have serious consequences for engine performance. In this context, the present study aimed to evaluate the effect of ethanol content on the miscibility of components in mixtures containing ethanol + biodiesel + diesel through the study of liquid-liquid equilibrium. The results from ternary phase diagrams revealed that the amount of water present in ethanol has a significant effect on the miscibility of the mixture components, with larger biphasic regions observed in systems with lower ethanol content. For the 95% ethanol diagram, the reliability of experimental data on equilibrium lines was assessed through the Othmer-Tobias and Hand correlations, which showed correlation coefficients (R²) of 0.996 and 0.995, respectively. The results obtained from the NRTL and UNIQUAC thermodynamic models demonstrated excellent agreement with the experimental data, with a deviation of only 1.78 and 0.78% for the NRTL and UNIQUAC models.

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Section: Nrtl and Uniquac Modelssupporting

confidence: 89%

Section: Raw Materialsmentioning

confidence: 99%

Section: Distribution Coefficients and Selectivitymentioning

confidence: 99%

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Evaluation Of The Effect Of Ethyl Alcohol Content In A Ternary Ethanol/Biodiesel/Diesel System

Nogueira Duarte,

Medeiros,

De Oliveira

et al. 2024

International Journal of Thermodynamics

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Measurement and thermodynamic correlation of liquid–liquid equilibria of water + n-propanol + toluene at 20°C and atmospheric pressure

Hamamah,

Grützner

2024

Discov Chem Eng

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Although the system water + n-propanol + toluene is important for research and industry, its liquid–liquid equilibria LLE are scarcely covered in literature, with no thermodynamic modeling reported using typical equations of state or activity coefficient models. The current work addresses this gap by presenting the equilibria of the system at 20°C and atmospheric pressure. That includes the binodal curve and twelve tie lines covering the entire miscibility gap, whereby the compositions of the conjugate phases are determined using high-precision refractive index measurements. The quality of the data is verified by applying the techniques of conjugate lines and mass balances, whereas it is shown that empirical correlations cannot be used for that purpose. Three different methods to extrapolate the critical point are then employed and, using the more reliable one, that point is located and added to the dataset. Further thermodynamic correlation of the data is conducted using the activity coefficient models, UNIQUAC and NRTL. While the former did not perform well, the latter was able to model the LLE and adapt to temperature changes.

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Experimental Study of Liquid–Liquid Equilibrium and Thermodynamic Modeling for Systems Containing Alcohols + Biodiesel + Diesel

Cited by 2 publications

References 53 publications

Evaluation Of The Effect Of Ethyl Alcohol Content In A Ternary Ethanol/Biodiesel/Diesel System

Evaluation Of The Effect Of Ethyl Alcohol Content In A Ternary Ethanol/Biodiesel/Diesel System

Measurement and thermodynamic correlation of liquid–liquid equilibria of water + n-propanol + toluene at 20°C and atmospheric pressure

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