Continuous production of biofuel from refined and used palm olein oil with supercritical methanol at a low molar ratio

Sakdasri, Winatta; Sawangkeaw, Ruengwit; Ngamprasertsith, Somkiat

doi:10.1016/j.enconman.2015.07.027

Cited by 23 publications

(6 citation statements)

References 33 publications

(62 reference statements)

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“…The FAEEs content was observed to increase with increasing ethanol to oil molar ratio, and is consistent with the literature (Song et al, 2008;Varma and Madras, 2007). This finding is explained by the lowering of the critical point of the UPO-ethanol mixture with increasing alcohol content (Anitescu et al, 2008;Sakdasri et al, 2015). However, the FAEEs yield was observed in the highest values only of 71.76% at the molar ratio of 12:1.…”

Section: Effect Of Molar Ratiosupporting

confidence: 89%

An entirely renewable biofuel production from used palm oil with supercritical ethanol at low molar ratio

Sakdasri

Sawangkeaw

Ngamprasertsith

2017

Braz. J. Chem. Eng.

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-The biofuel production from used palm oil (UPO) using supercritical ethanol (SCE) at low molar ratio was investigated in order to produce an entirely renewable fuel. The effects of the reaction time and ethanol to oil molar ratio were considered from 0.5 to 10 min and 6:1 to 18:1, respectively. The optimal parameters were 10 min and a 12:1 molar ratio, representing a remarkable reduction from 42:1 for the conventional SCE process. Because of the high operating temperature, the triglycerides conversion rate reached 99%, and the glycerides content met the international specification for biodiesel. However, an ester content of 70% was obtained at optimal conditions. The side reaction between glycerol and ethanol demonstrated a positive effect in increasing fuel yield by 8.15%. The product can be considered an alternative biofuel instead of biodiesel.

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Section: Effect Of Molar Ratiosupporting

confidence: 89%

An entirely renewable biofuel production from used palm oil with supercritical ethanol at low molar ratio

Sakdasri

Sawangkeaw

Ngamprasertsith

2017

Braz. J. Chem. Eng.

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“…The presence of 3‐methoxy‐1, 2‐propanediol indicated the etherification reaction between glycerol and SCM . The ether isomers, i.e.…”

Section: Resultsmentioning

confidence: 99%

Response surface methodology for the optimization of biofuel production at a low molar ratio of supercritical methanol to used palm olein oil

Sakdasri

Sawangkeaw

Ngamprasertsith

2016

Asia-Pacific J Chem Eng

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A large energy input for preheating and recovering of high excess alcohols used are the main issue in the supercritical methanol (SCM) process. This work demonstrated the production of biofuel from used palm olein oil in SCM using a low methanol to oil molar ratio. The effects of the operating temperature (350–400 °C), methanol to oil molar ratio (9:1–12:1), and reaction time (2–10 min), and their reciprocal interactions were evaluated using a central composite design. The optimum process conditions were determined to be a temperature of 395 °C, methanol to oil molar ratio of 12:1, and reaction time of approximately 9 min through the use of response surface methodology. The modified quadratic regression model demonstrated that the triglyceride conversion (%XTG) and methyl ester content (%FAME) were sensitive to changes in the operating temperature and reaction time, while the effect of the methanol to oil molar ratio was minimal. Under the optimal operating conditions, the predicted values of %XTG and %FAME were 100% and 63.67%, respectively, which were in good agreement with the experimental values. The fuel properties of biofuel obtained from optimal conditions were examined and then compared to American and European standards for biodiesel. © 2016 Curtin University of Technology and John Wiley & Sons, Ltd.

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“…The requirement of lower molar ratios at higher temperatures for esterification/transesterification was noted by other investigators in the synthesis of biodiesel. 27,28 At 573 K, the mixture is supercritical for all molar ratios other than 5:1. Thus, at 5:1 molar ratio, a slight drop in yield is observed as compared to 10:1 and 20:1, but the yields were better than those at 40:1 molar ratio.…”

Section: Resultsmentioning

confidence: 99%

“…Thermal degradation of esters at higher temperatures and greater times is due to the onset of pyrolytic reactions. Several side reactions could occur leading to decarboxylation and formation of hydrocarbons, hydrolysis, etc. , The analysis of decomposed products may not be very useful in the synthesis of pure diesters that have specific applications. However, in the case of biodiesel synthesis under supercritical conditions, these products add to the calorific value and total yield of the final product, making such analysis more useful.…”

Section: Resultsmentioning

confidence: 99%

Esterification of Sebacic Acid in Near-Critical and Supercritical Methanol

Narayan

Madras

2017

Ind. Eng. Chem. Res.

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Diesters of sebacic acid find various applications as plasticizers, solvents, and lubricants. Noncatalytic esterification of dibasic acids under near-critical and supercritical alcohol conditions was conducted for the first time. Esterification of sebacic acid (decanedioic acid) and methanol was chosen as a candidate reaction. The effect of molar ratio of methanol to sebacic acid, temperature, addition of water, and pressure was studied on the yields of the diesters and monoesters. A maximum molar yield of 87% with a selectivity of 16 between monoester and diester was obtained at 623 K with a molar ratio of 5:1 within a reaction time of 25 min. A kinetic model was developed to correlate the experimental data, and activation energies were computed using the Arrhenius equation. The effects of addition of water and pressure on the yield and selectivity show that esterification is fairly water resistant and could be carried out at operating pressures much lower than the critical pressure of methanol.

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Continuous production of biofuel from refined and used palm olein oil with supercritical methanol at a low molar ratio

Cited by 23 publications

References 33 publications

An entirely renewable biofuel production from used palm oil with supercritical ethanol at low molar ratio

An entirely renewable biofuel production from used palm oil with supercritical ethanol at low molar ratio

Response surface methodology for the optimization of biofuel production at a low molar ratio of supercritical methanol to used palm olein oil

Esterification of Sebacic Acid in Near-Critical and Supercritical Methanol

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