Ethanolysis of vegetable oils: A systematic study using homogeneous alkali catalysts

Karonis, D; Anastopoulos, G; Stournas, S

dc.contributor.author	Karonis, D	en
dc.contributor.author	Anastopoulos, G	en
dc.contributor.author	Stournas, S	en
dc.date.accessioned	2014-03-01T02:46:08Z
dc.date.available	2014-03-01T02:46:08Z
dc.date.issued	2009	en
dc.identifier.issn	0065-7727	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/32569
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-78649787936&partnerID=40&md5=5c966b4a2de4bb3c1dd079305e45900b	en
dc.subject.classification	Chemistry, Multidisciplinary	en
dc.title	Ethanolysis of vegetable oils: A systematic study using homogeneous alkali catalysts	en
heal.type	conferenceItem	en
heal.language	English	en
heal.publicationDate	2009	en
heal.abstract	The transesterification reaction of 4 different vegetable oils (sunflower, rapeseed, olive oil and used frying oil) by means of ethanol, using sodium hydroxide, potassium hydroxide, sodium methoxide, potassium methoxide and potassium tert-butoxide as catalysts was studied. The ester preparation involved a two-step transesterification reaction, followed by purification. The parameters studied were catalyst type, mass ratio of catalyst to oil, molar ratio of ethanol to oil, and reaction temperature in both stages. Potassium hydroxide gave the highest ester yield, although the yields with the other catalysts were acceptable. The optimal conditions for first stage transesterification were an ethanol/oil molar ratio of 12:1, KOH amount 1% m/m, and 80 °C temperature, with maximum ethyl esters yield of 81.4 % m/m. In the second stage, the yield increased by 16% more, under the following optimal conditions: Catalyst concentration 0.75% and ethanol/oil molar ratio 6:1. The fuel properties of the esters were measured according to EN test methods. The experimental results showed that the values of density, viscosity, and higher heating value of ethyl esters were similar to those of automotive diesel fuel. CFPP values were higher (undesirable). Flash points were higher than those of diesel fuel constituting a safety guarantee.	en
heal.publisher	AMER CHEMICAL SOC	en
heal.journalName	ACS National Meeting Book of Abstracts	en
dc.identifier.isi	ISI:000207861905175	en
dc.identifier.volume	238	en