Qualitative Analysis of Transesterification of Waste Pig Fat in Supercritical Alcohols

Poudel, Jeeban; Shah, Malesh; Karki, Sujeeta; Oh, Sea Cheon

doi:10.3390/en10030265

Cited by 12 publications

(3 citation statements)

References 41 publications

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“…The similarity, with some exceptions, is due to the resemblance between the two alcohols in terms of chemical characteristics. The trend of the products obtained is similar to that of the results obtained for transesterification of waste pig fat in supercritical alcohols by Jeeban et al [40]. The results obtained in Tables 2-5 demonstrate that no significant variation was obtained on ester composition on increasing the transesterification temperature and retention time.…”

Section: Resultssupporting

confidence: 86%

Supercritical Transesterification of Waste Vegetable Oil: Characteristic Comparison of Ethanol and Methanol as Solvents

et al. 2017

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Transesterification of waste vegetable oil is one of the promising partial substitutes for fossil fuels. The degradation characteristics of waste vegetable oil using supercritical alcohols (ethanol and methanol) have been studied in this research. The elementary target was to conduct comparative analysis of the effect of supercritical methanol and supercritical ethanol as solvents on the transesterification along with the analysis of product obtained in terms of carbon number. The experiments were carried out at transesterification temperatures of 250, 270 and 290 • C, retention time of 0 to 60 min at an interval of 15 min and oil to alcohol molar ratios of 1:6, 1:12 and 1:18 for both alcohols. The conversion increased with increase in transesterification temperature and retention time. At 290 • C, almost 99% conversion was achieved for 60-min holding time for both alcohols. Increase in conversion of waste vegetable oil was observed as the molar ratio increased. Supercritical transesterification resulted into ester yield higher than 95% with non-ester composition and glycerol collectively less than 5%.

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Section: Resultssupporting

confidence: 86%

Supercritical Transesterification of Waste Vegetable Oil: Characteristic Comparison of Ethanol and Methanol as Solvents

et al. 2017

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“…Biodiesel is commonly produced from edible feedstocks such as soybean, sunflower, and rapeseed oils [5][6][7][8]; however, the use of these feedstocks for biodiesel production is restricted because of their high cost (which accounts for 75% of the production cost) and competition with demand for the food supply [9][10][11]. Therefore, inedible and waste oils have been developed as potential feedstocks for biodiesel production [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Liquid Lipase-Catalyzed Esterification of Oleic Acid with Methanol for Biodiesel Production in the Presence of Superabsorbent Polymer: Optimization by Using Response Surface Methodology

et al. 2018

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Liquid lipase-catalyzed esterification of fatty acids with methanol is a promising process for biodiesel production. However, water by-product from this process favors the reverse reaction, thus reducing the reaction yield. To address this, superabsorbent polymer (SAP) was used as a water-removal agent in the esterification in this study. SAP significantly enhanced the conversion yield compared with the reaction without SAP. The lipase-catalyzed esterification in the presence of SAP was then optimized by response surface methodology to maximize the reaction conversion. A maximum conversion of 96.73% was obtained at a temperature of 35.25 • C, methanol to oleic acid molar ratio of 3.44:1, SAP loading of 10.55%, and enzyme loading of 11.98%. Under these conditions, the Eversa Transform lipase could only be reused once. This study suggests that the liquid lipase-catalyzed esterification of fatty acids using SAP as a water-removal agent is an efficient process for producing biodiesel.

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“…For instance, Kusdiana and Saka [33] obtained a conversion in methyl esters as high as 95 wt % in about 240 s in a batch reactor, while Minami and Saka [49] reported conversions of around 90 wt % in 30 min reaction for methyl esterification of oleic acid in continuous mode. Conversion of 99.8% was obtained for SCM and SCE at holding time of 60 min by Jeeban et al [22] for transesterification of pig fat. Analogous conversion can be obtained at lower holding time by increasing the transesterification temperature or by increasing the voltage of the electrical heater.…”

Section: Resultsmentioning

confidence: 99%

Comparison of Biodiesel Obtained from Virgin Cooking Oil and Waste Cooking Oil Using Supercritical and Catalytic Transesterification

et al. 2017

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Abstract:Comparative analysis of transesterification of virgin cooking oil (VCO) and waste cooking oil (WCO) in catalyzed and supercritical transesterification process using methanol and ethanol as solvents has been conducted in this study. The luminous point of this research was the direct comparison of catalytic and supercritical process using the ester composition obtained from virgin cooking oil and waste cooking oil transesterification. Oil to alcohol molar ratio of 1:6 and reaction condition of 65 • C and 1 bar pressure were considered for the catalytic process, while 260 • C and high pressure (65 and 75 bar for methanol and ethanol, respectively) were accounted for the supercritical process. Distinct layer separation was observed for both processes. Ester, fatty acid and glycerol composition was studied for both the upper and lower layers separately, from which 100% ester composition in the upper layer and a mixture of ester and other composition in the lower layer was obtained for the catalytic process owing to succeeding filtration and washing. However, mixture of ester (>75%) and other composition was obtained in both layers for the supercritical process where purification process was not implemented. The similarity in the result obtained demonstrates the superiority of waste cooking oil compared to virgin cooking oil, taking cost into consideration.

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Qualitative Analysis of Transesterification of Waste Pig Fat in Supercritical Alcohols

Cited by 12 publications

References 41 publications

Supercritical Transesterification of Waste Vegetable Oil: Characteristic Comparison of Ethanol and Methanol as Solvents

Supercritical Transesterification of Waste Vegetable Oil: Characteristic Comparison of Ethanol and Methanol as Solvents

Liquid Lipase-Catalyzed Esterification of Oleic Acid with Methanol for Biodiesel Production in the Presence of Superabsorbent Polymer: Optimization by Using Response Surface Methodology

Comparison of Biodiesel Obtained from Virgin Cooking Oil and Waste Cooking Oil Using Supercritical and Catalytic Transesterification

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