Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.21/2840
Título: Biodiesel production from waste frying oils over lime catalysts
Autor: Puna, Jaime Filipe
Correia, Maria Joana Neiva
Dias, Ana Paula Soares
Gomes, Joao
Bordado, Joao
Palavras-chave: Biodiesel
Waste frying oils
CaO catalyst
Oil acidity
S-shape kinetics
Near-Infrared Spectroscopy
Heterogeneous Catalysts
Soybean Oil
Calcium-Oxide
Cooking Oil
Solid Base
Transesterification
Hydrotalcites
Quality
Models
Data: Ago-2013
Editora: Springer
Citação: PUNA, Jaime Filipe; CORREIA, Maria Joana Neiva; DIAS, Ana Paula Soares; GOMES, Joao; BORDADO, Joao - Biodiesel production from waste frying oils over lime catalysts. Reaction Kinetics Mechanisms and Catalysis. ISSN 1878-5190. Vol. 109, nr. 2 (2013), p. 405-415.
Resumo: Biodiesel production from semi-refined oils (SRO) and waste frying oils (WFO) was studied using commercial CaO as heterogeneous catalyst. The methanolysis tests were carried out in mild reaction conditions (62 A degrees C, atmospheric pressure). With such conditions, SRO (soybean and rapeseed) allowed to produce a biodiesel containing 97-98 % of methyl esters (FAME), whereas WFO only provided 86-87 % of FAME. The lower FAME yield for WFO oil is ascribable to the partial neutralization of the catalyst by free fatty acids. Also, soaps formation from the WFO oil reduced the weight yield of the oil phase (containing FAME) obtained and increased the MONG content of the glycerin phase. The catalysts stability tests showed high stability even when WFO oil was processed. Catalytic tests performed with blends of WFO/semi-refined oils showed blending as a good strategy to process low value raw oils with minor decay of the catalyst performance. Both WFO and semi-refined oils showed S-shape kinetics curves thus discarding significant differences of the reaction mechanisms.
Peer review: yes
URI: http://hdl.handle.net/10400.21/2840
ISSN: 1878-5190
Aparece nas colecções:ISEL - Eng. Quim. Biol. - Artigos



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