Biodiesel production using supercritical methanol/carbon dioxide mixtures in a continuous reactor
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hdl:2117/14267
Document typeArticle
Defense date2011-03-01
PublisherElsevier Science Ltd.
Rights accessRestricted access - publisher's policy
Except where otherwise noted, content on this work
is licensed under a Creative Commons license
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Attribution-NonCommercial-NoDerivs 3.0 Spain
Abstract
Fatty acid methyl esters (biodiesel) were produced by the transesterification of triglycerides with compressed
methanol (critical point at 240 C and 81 bar) in the presence of solid acids as heterogeneous catalyst
(SAC-13). Addition of a co-solvent, supercritical carbon dioxide (critical point at 31 C and 73 bar),
increased the rate of the supercritical alcohols transesterification, making it possible to obtain high biodiesel
yields at mild temperature conditions. Experiments were carried out in a fixed bed reactor, and
reactions were studied at 150–205 C, mass flow rate 6–24 ml/min at a pressure of 250 bar. The molar
ratio of methanol to oil, and catalyst amount were kept constant (9 g). The reaction temperature and
space time were investigated to determine the best way for producing biodiesel. The results obtained
show that the observed reaction rate is 20 time faster than conventional biodiesel production processes.
The temperature of 200 C with a reaction time of 2 min were found to be optimal for the maximum
(88%) conversion to methyl ester and the free glycerol content was found below the specification limits.
CitationMaçaira, J. [et al.]. Biodiesel production using supercritical methanol/carbon dioxide mixtures in a continuous reactor. "Fuel", 01 Març 2011, vol. 90, núm. 6, p. 2280-2288.
ISSN0016-2361
Publisher versionhttp://www.sciencedirect.com/science/article/pii/S0016236111000871
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