2014
DOI: 10.1590/0104-6632.20140312s00002616
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Biodiesel production through non-catalytic supercritical transesterification: current state and perspectives

Abstract: -The inconveniences of the conventional method for biodiesel production by alkaline catalysis suggests research towards alternative methods, with the non-catalytic transesterification using an alcohol at supercritical conditions proposed as a promising technique for biodiesel production. The so-called supercritical method (SCM) has powerful advantages over conventional techniques, such as fast reaction rates, feedstock flexibility, production efficiency and environmentally friendly benefits. However, applicati… Show more

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Cited by 71 publications
(30 citation statements)
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“…Better operational conditions were found at 300 °C, 20 MPa, molar ratio 1:40, and 52 min reaction, reaching 74 % esters yield. In the literature is also found the production of acrolein, acetaldehyde, acetic acid, polyglycerol, and others …”
Section: Resultsmentioning
confidence: 96%
“…Better operational conditions were found at 300 °C, 20 MPa, molar ratio 1:40, and 52 min reaction, reaching 74 % esters yield. In the literature is also found the production of acrolein, acetaldehyde, acetic acid, polyglycerol, and others …”
Section: Resultsmentioning
confidence: 96%
“…However, longer residence time will have trade-off relations due to multiple processes causing a decrease in FAME or FAEE composition in the product. He et al [47] evaluated the results obtained for the transesterification of soybean by varying the content of supercritical methanol (SCM) and justified that the decrease in reaction yield is the decrease in the content of unsaturated esters caused by isomerization, hydrogenation and thermal decomposition that consume such esters, especially C18:2 (linoleic) and C18:3 (linolenate), which are more susceptible to thermal decomposition in contrast to mono-unsaturated and saturated esters [48]. So, optimum reaction condition is necessary to countenance the advantage of the supercritical transesterification process over catalytic transesterification.…”
Section: Resultsmentioning
confidence: 99%
“…The degradation of the fatty acid methyl ester (FAME) product typically occurs via radical chain scission with previous studies demonstrating that the degradation of methyl stearate and methyl oleate to shorter chain 1-alkenes and alkanes respectively will occur at reaction temperatures greater than 260 • C [6,15,16]. To circumvent the need for high energy input and the need for large masses of methanol chemical inputs, some studies have suggested the viability of the alternative utilisation of an integrated subcritical lipid hydrolysis and supercritical esterification (ISHSE) process.…”
Section: Introductionmentioning
confidence: 84%