Evaluation of optimal activity coefficient models for modeling and simulation of liquid–liquid equilibrium of biodiesel+glycerol+alcohol systems

Carmo, Frederico R. do; Evangelista, Nathan S.; Santiago-Aguiar, Rílvia Saraiva de; Fernandes, Fabiano A. N.; Sant’Ana, Hosiberto Batista de

doi:10.1016/j.fuel.2014.01.108

Cited by 32 publications

(19 citation statements)

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“…Differences in molecular weight for the systems containing biodiesel, glycerol and alcohol are large, so using mass fractions instead of molar fractions for the calculations of the LLE is recommended to obtain better results [15,18,21]The use of mass fractions was first proposed by Oishi and Prautnitz [17] to calculate the activity of solvents in polymers using the UNIQUAC and UNIFAC models. Previous works calculated the LLE for the systems with high differences between molecular weights of the compounds involved, obtaining accurate results [5,15,17e19].…”

Section: Liquid E Liquid Equilibrium Calculationmentioning

confidence: 99%

“…Vegetable oils and biodiesel are mixtures of triacylglycerols and alkyl esters, respectively, previous works suggested modeling biodiesel as an average molecule obtained from the fatty acid profile of the vegetable oil used for its production [15,18,21]. To introduce biodiesel in the UNIFAC model, a pseudo molecule with the structure (CH 3 ) 2 (CH 2 ) m (CH]CH) n (CH) p (OH) p CH 2 COO was used, where m, n and p can be non-integer numbers.…”

Section: Estimation Of the Group Interaction Parametersmentioning

confidence: 99%

“…CPA EoS) can successfully predict their experimental data with global average deviations up to 6%. Hakim et al[14] correlated LLE experimental data from canola and sunflower biodiesel, glycerol and methanol with the NRTL and the WilsonÀNRF Gibbs free energy models, Recently, Carmo et al[15] evaluated the LLE in systems composed by biodiesel, glycerol and alcohol using UNIFAC e Dortmund, UNIFAC, UNIQUAC, NRTL, ASOG…”

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confidence: 99%

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Liquid-liquid equilibrium for biodiesel-glycerol-methanol or ethanol systems using UNIFAC correlated parameters

Noriega

Narváez

Imbachi

et al. 2016

Energy

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Section: Liquid E Liquid Equilibrium Calculationmentioning

confidence: 99%

Section: Estimation Of the Group Interaction Parametersmentioning

confidence: 99%

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confidence: 99%

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Liquid-liquid equilibrium for biodiesel-glycerol-methanol or ethanol systems using UNIFAC correlated parameters

Noriega

Narváez

Imbachi

et al. 2016

Energy

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“…Hence, liquid-liquid equilibrium (LLE) data play a fundamental role in the kinetic studies of the transesterification reaction, as well as in research involving the optimization of the biodiesel purification steps in which the separation of glycerol, ethanol and ethyl esters is desired (Basso et al, 2012). Despite the importance of this information, there are few published studies about LLE data for model systems containing fatty acid ethyl esters (FAEE), ethanol and glycerol measured at temperatures ranging from 323.15 to 353.15 K (Rocha et al, 2014;Mesquita et al, 2012;Carmo et al, 2014;Basso et al, 2012;Follegatti-Romero et al, 2012a), as the results presented here. Besides, these systems, specially using ethyl linoleate/ oleate/ palmitate/ laurate, have been modeled using almost only the CPA EoS (Follegatti-Romero et al, 2012a, 2012bOliveira et al, 2010;Oliveira et al, 2009;Oliveira et al, 2008;Oliveira et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Liquid-Liquid Equilibria for Systems Containing Fatty Acid Ethyl Esters, Ethanol and Glycerol at 333.15 and 343.15 K: Experimental Data, Thermodynamic and Artificial Neural Network Modeling

Cavalcanti

Oliveira

Meirelles

2018

Braz. J. Chem. Eng.

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In this study, the liquid-liquid equilibrium (LLE) data of systems containing ethyl linoleate/oleate/ palmitate/laurate, ethanol and glycerol at temperatures ranging from 323.15 to 353.15 K were used to evaluate the performance of the NRTL, UNIFAC, Cubic-Plus-Association Equation of State (CPA EoS), and artificial neural network (ANN) models. The systems evaluated correspond to the most important components formed at the end of the ethanolysis reaction of soybean, palm and coconut oils. The temperature range selected is very important for heterogeneous catalysts, especially for high-pressure systems. The accuracy of the models was evaluated by average global deviation. UNIFAC, UNIFAC-LLE and CPA EoS models showed lower accuracy with deviations of 10.1, 8.01 and 5.95%, respectively. In spite of this predictive limitation, these models show high extrapolation capability for the description of LLE behavior when few experimental data are available in the literature. The ANN model shows the best agreement between experimental and predicted data with an average deviation of 1.12%. In this regard, ANN is offered in this work as an alternative to equations of state and activity coefficient models to be used in a more reliable and less cumbersome way for process simulators of biodiesel production and separation equipment design.

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“…During biofuel production, vegetable oils or animal fats react with an alcohol (methanol, ethanol, or a higher alcohol) to produce fatty acid esters and glycerol (G) as byproducts (CARMO et al, 2014). Refined glycerin has several industrial applications, but is mainly used in the production of cosmetics and medicines.…”

Section: Introductionmentioning

confidence: 99%

Comparison between biodegradable polymers from cassava starch and glycerol as additives to biogas production

Cremonez

Feiden

Teleken

et al. 2016

SCA

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In this study, we compared cassava starch-based biodegradable polymers (PBMs) and glycerol (G) as additives used to increase biogas production from the co-digestion of swine wastewater (ARS). We chose to work with an inoculum comprising 40% (v/v) of the total volume of the reactor; this inoculum was obtained from a Canadian model digester for treating swine waste. In the anaerobic digestion process, batch reactors were used on a laboratory scale with a total volume of approximately 4 L and a working volume of 3.2 L. Three treatments were conducted to compare the efficiency of solid removal, the chemical oxygen demand (COD), and the production of biogas. The first treatment contained only swine waste; the second included the addition of glycerol at 1, 3, and 5% (w/v); and the third treatment included the addition of 1, 3, and 5% (w/v) of PBM residue in relation to the swine wastewater. From the results, it can be concluded that higher yields were obtained for the treatment with 3% PBM and 1% glycerol. Most treatments showed high removal rates of total solids and total volatile solids. Reductions lower than 70% were obtained only for treatments with PBM and glycerol at a ratio of 5%. Key words: Additives. Alternative fuels. Biodegradable polymers. Glycerol. ResumoO presente trabalho tem por finalidade comparar o potencial aditivo no aumento da produção de biogás de polímeros biodegradáveis a base de fécula de mandioca (PBM) e do glicerol, já comumente empregado com essa finalidade, ambos em co-digestão com água residuária de suinocultura. Utilizouse como matéria-prima para produção de biogás, água residual de suinocultura, material plástico biodegradável produzido a partir de fécula de mandioca e glicerina bruta proveniente do processo de produção de biodiesel. Optou-se por trabalhar com 40% (v/v) de inóculo do volume total do reator. Para a condução do processo de digestão anaeróbia empregaram-se reatores com alimentação batelada de escala laboratorial de volume total de aproximadamente 4 litros e volume útil de 3,2 litros. Foram realizados 3 tratamentos visando comparar a eficiência da remoção de sólidos, demanda química de oxigênio e produção de biogás. O primeiro tratamento conteve apenas resíduo de suíno, o segundo a adição de glicerol em percentuais de 1, 3 e 5% (m/v) no mesmo resíduo e o terceiro a adição de 1, 3 e 5% (m/v) do polímero biodegradável a base de fécula de mandioca ao resíduo suíno. A partir dos resultados pode-se concluir que as maiores produções foram obtidas no tratamento de 3% de PBM e 1% de glicerol. A maioria dos tratamentos apresentou elevadas taxas de remoção de sólidos totais e sólidos totais voláteis. Apenas os tratamentos com PBM e glicerol na proporção de 5% obtiveram reduções inferiores a 70%. Palavras-chave: Aditivos. Glicerol. Polímeros biodegradáveis. Combustíveis alternativos.

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Evaluation of optimal activity coefficient models for modeling and simulation of liquid–liquid equilibrium of biodiesel+glycerol+alcohol systems

Cited by 32 publications

References 32 publications

Liquid-liquid equilibrium for biodiesel-glycerol-methanol or ethanol systems using UNIFAC correlated parameters

Liquid-liquid equilibrium for biodiesel-glycerol-methanol or ethanol systems using UNIFAC correlated parameters

Liquid-Liquid Equilibria for Systems Containing Fatty Acid Ethyl Esters, Ethanol and Glycerol at 333.15 and 343.15 K: Experimental Data, Thermodynamic and Artificial Neural Network Modeling

Comparison between biodegradable polymers from cassava starch and glycerol as additives to biogas production

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