Kinetics of the biphasic liquid–liquid transesterification of vegetable oils into biodiesel

Silva, Suzana Pedroza; Sales, Deivson Cesar Silva; Abreu, Cesar A. Pimentel de; Schuler, Alexandre Ricardo Pereira; Abreu, César Augusto Moraes de

doi:10.1007/s11144-017-1322-8

Cited by 9 publications

(12 citation statements)

References 22 publications

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“…where the biodiesel production rate (r B ) was introduced according the formulation by Silva et al [5]:…”

Section: Application To the Reactive Processmentioning

confidence: 99%

“…Using the values of the reaction rate constants estimated from methanolysis and ethanolysis operations (Table 6), conducted under kinetic-chemical regime [5], simulations of kinetic behaviors were performed at temperatures of 25°C, 40°C and 60°C.…”

Section: Application To the Reactive Processmentioning

confidence: 99%

“…Reaction rate for alkaline transesterification of soybean (k). Conditions: A:OL/6:1, C NaOH = 0.50% wt., 600 rpm [5].…”

Section: Application To the Reactive Processmentioning

confidence: 99%

“…Thus, in-depth knowledge of the phenomena involved in its operations involves detailing the interactions between the different partially miscible or immiscible liquid phases present, including oil, alcohol, biodiesel and glycerin. The different approaches to assess liquid-liquid interactions in the production of biodiesel identified as a heterogeneous process have highlighted the contributions of mass transfer, although associated with reaction effects [3][4][5][6]. However, this type an approach in which the mass transfer is not considered independently as a relevant step, prevents accurate descriptions of the effects that directly influence the performance of the process.…”

Section: Introductionmentioning

confidence: 99%

“…Different investigations on the effects related to mass transfers between liquid phases in alkaline transesterification processes have indicated orders of magnitude of parameters representing these phenomena, although always combined with reaction effects, and for a fixed composition of each phase [21][22][23] During biodiesel production, variations in composition result from the reactive process in which concentrations continue to evolve [5,20].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Quantitative of Mass Transfer in Liquid-Liquid Operations of Oil-Alcohol-Glycerin Systems

Silva¹,

Abreu²

2022

Alternative Energies and Efficiency Evaluation

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The effects of mass transfer were quantified for the effective performance of mixtures between partially miscible phases, or for the promotion of their separations. To consolidate the analysis of heterogeneous liquid–liquid processes, variations in the composition of the liquid phases over the evolution of contact operations were considered, detailing the physical mechanisms involved in the mixtures of oil (soy, sunflower) and alcohol (methanol, ethanol), and in the separation between biodiesel and glycerin. Based on experimental evaluations, the average distribution coefficients for triglycerides (oil-alcohol) and glycerol (biodiesel-glycerin) were estimated at 1.31 and 1.46, and 3.42 × 10−2 and 4.06 × 10–2, for soybean and sunflower, respectively, while their mass transfer coefficients, depending on their concentration ranges in the phase, varied in orders of magnitude from 10−2 s−1 to 10–4 s−1. Including the values of the physical parameters, a heterogeneous model for the alkaline transesterification of soybean oil (methanol, ethanol, NaOH, 25°C, 40°C, 60°C, 600 rpm) was validated.

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“…where the biodiesel production rate (r B ) was introduced according the formulation by Silva et al [5]:…”

Section: Application To the Reactive Processmentioning

confidence: 99%

Section: Application To the Reactive Processmentioning

confidence: 99%

“…Reaction rate for alkaline transesterification of soybean (k). Conditions: A:OL/6:1, C NaOH = 0.50% wt., 600 rpm [5].…”

Section: Application To the Reactive Processmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Quantitative of Mass Transfer in Liquid-Liquid Operations of Oil-Alcohol-Glycerin Systems

Silva¹,

Abreu²

2022

Alternative Energies and Efficiency Evaluation

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Kinetics of the production of alkyl esters by transesterification of soybean oil

Silva

Gusmão²,

Silva

et al. 2021

J Americ Oil Chem Soc

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Biodiesel was produced by transesterification from soybean oil using methanol (methanolysis) and ethanol (ethanolysis) under conditions including NaOH/alcohol 0.50% wt, molar ratio alcohol:oil = 6:1, 600 rpm, 333 K. The evolution of biodiesel and glycerol esters concentrations were obtained by gas chromatography and liquid chromatography, respectively, as a basis for the evaluation of the kinetics of the process. A mathematical model was developed to represent the batch transesterification operations, referring to a mechanism including reactive acylglycerols and intermediates, esters, and glycerol. Considering the importance of the composition of fatty esters in biodiesel, their evolution during processing was quantified. The specific reaction rates for methanolysis and ethanolysis were 0.245 and 0.275 min−1, respectively. The concentration evolution of each fatty ester of the biodiesel was predicted by the solutions of the model equations, based on specific reaction rate constants quantified in the orders of magnitude k = 0.225–0.245 min−1 for methanolysis, and k = 0.225–0.275 min−1 for ethanolysis. Selectivity and yield values of the fatty esters were calculated: it was found Si = 23.5%–25.6% and Ri = 66.3%–89.1% for methanolysis and Si = 21.8%–26.7% and Ri = 74.1%–90.6% for ethanolysis. Based on the model, predictions of the kinetic behavior of acylglycerols reactants (triacylglycerois) and intermediates (monacylglycerois, diacylglycerois) were established.

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Catalytic synthesis of biodiesel from waste cooking oil and corn oil over zirconia-based metal oxide nanocatalysts

Afsharizadeh

Mohsen-Nia

2019

Reac Kinet Mech Cat

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Kinetics of the biphasic liquid–liquid transesterification of vegetable oils into biodiesel

Cited by 9 publications

References 22 publications

Quantitative of Mass Transfer in Liquid-Liquid Operations of Oil-Alcohol-Glycerin Systems

Quantitative of Mass Transfer in Liquid-Liquid Operations of Oil-Alcohol-Glycerin Systems

Kinetics of the production of alkyl esters by transesterification of soybean oil

Catalytic synthesis of biodiesel from waste cooking oil and corn oil over zirconia-based metal oxide nanocatalysts

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