Optimization of hydrolysis in subcritical water as a pretreatment step for biodiesel production by esterification in supercritical methanol

Mićić, Radoslav; Tomić, Milan D.; Kiss, Ferenc; Nikolic-Djoric, Emilija; Simikić, Mirko

doi:10.1016/j.supflu.2015.04.026

Cited by 24 publications

(11 citation statements)

References 56 publications

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“…The main advantages of transesterification in subcritical condition for biodiesel production was high conversion and reaction rates [26]. The operating temperature under subcritical methanol ranges from 150 to 250 • C [26,27]. Subcritical methanol at 220 • C achieved the highest FAME yield.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Winoto

Yoswathana

2019

Energies

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The molar ratio of methanol to rubber seed oil (RSO), catalyst loading, and the reaction time of RSO biodiesel production were optimized in this work. The response surface methodology, using the Box–Behnken design, was analyzed to determine the optimum fatty acid methyl ester (FAME) yield. The performance of various nanomagnetic CaO-based catalysts—KF/CaO-Fe3O4, KF/CaO-Fe3O4-Li (Li additives), and KF/CaO-Fe3O4-Al (Al additives)—were compared. Rubber seed biodiesel was produced via the transesterification process under subcritical methanol conditions with nanomagnetic catalysts. The experimental results indicated that the KF/CaO-Fe3O4-Al nanomagnetic catalyst produced the highest FAME yield of 86.79%. The optimum conditions were a 28:1 molar ratio of methanol to RSO, 1.5 wt % catalyst, and 49 min reaction time. Al additives of KF/CaO-Fe3O4 nanomagnetic catalyst enhanced FAME yield without Al up to 18.17% and shortened the reaction time by up to 11 min.

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Section: Introductionmentioning

confidence: 99%

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Winoto

Yoswathana

2019

Energies

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“…In all experiments, the pressure was autogeneous and a water/oil ratio of 1:1 (wt/wt) was used. Variables were chosen based on previous works [16,27,32,34,35,75]. To ensure the reliability of the results, some reaction conditions were studied in triplicate and the standard deviation as a function of the reaction time ranged from 0.7 to 5 %, which is within the acceptable range for hydrolysis reactions where many factors influence the intermediate conversion and the final product.…”

Section: Hydrolysis Reactionmentioning

confidence: 99%

Kinetics of Soybean Oil Hydrolysis on Niobium Catalysts

et al. 2020

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The catalytic hydrolysis of soybean oil was used as an alternative for the production of monoglycerides (MG) and diglycerides (DG). The reactions were conducted in a stainless-steel tubular reactor in the temperature range of 240-290°C, on niobium phosphate (NBP) and niobium oxide (NBO) as catalysts. In the hydrolysis reactions at 270°C, the maximum selectivities of the products of interest were obtained at 22 % MG and 48 % DG for the reaction with NBP, and 7 % MG and 33 % DG with NBO, for 59 % and 36 % of triglyceride conversion in 10 min, respectively. The proposed kinetic model presented a good fit of the theoretical model with the experimental data, showing that the previous hypotheses considered for the mechanism development are suitable for describing the kinetics of soybean oil hydrolysis.

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“…As water and oil have weak interactions temperature below 200 C, the reaction starts at the phase boundary, causing the conversion to be slow [34]. High temperature decreased the dielectric constant of water from 80 to 25 at 250 C, increasing the interactions of oil in water and the speed of the reaction [35]. Alenezi at al [36].…”

Section: Effect Of Temperature Molar Ratio Time and Stirrer On Ffasmentioning

confidence: 99%

Experimental factorial design on hydroesterification of waste cooking oil by subcritical conditions for biodiesel production

et al. 2017

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Hydroesterification is innovation biodiesel production using low cost feedstock by two-step: hydrolysis of waste cooking oil to FFAs in subcritical water and chemical esterification of FFAs into FAME (biodiesel) with methanol. The purpose was to apply the experimental factorial design to evaluate the influence of reaction variables on the effectiveness of hydrolysis and determine the relationship of FFAs and FAMEs yields. Experiments were conducted in a batch reactor under diverse reaction conditions to determine the optimal parameters for hydrolysis. This analyses indicated that high FFAs yields (95 wt%) are achieved using 250 C; 120 min; 100:1 water-to-oil molar ratio and 700 rpm. Research results revealed a conversion the FFAs in 98.5 wt% of FAMEs with high quality by esterification in biodiesel production. This study shows that the biodiesel produced by subcritical/chemical hydroesterification process has similar qualities to the biodiesel obtained by traditional alkaline transesterification, which suggests a promising alternative for biodiesel production.

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Optimization of hydrolysis in subcritical water as a pretreatment step for biodiesel production by esterification in supercritical methanol

Cited by 24 publications

References 56 publications

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Optimization of Biodiesel Production Using Nanomagnetic CaO-Based Catalysts with Subcritical Methanol Transesterification of Rubber Seed Oil

Kinetics of Soybean Oil Hydrolysis on Niobium Catalysts

Experimental factorial design on hydroesterification of waste cooking oil by subcritical conditions for biodiesel production

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