Data di Pubblicazione:
2012
Citazione:
Scalable free fatty acid esterification for methyl esters production / A. Di Fronzo, D.C. Boffito, C. Pirola, C.L. Bianchi, S. Vitali, G. Carvoli. ((Intervento presentato al 18. convegno Congresso Nazionale della Divisione di Chimica Industriale della Società Chimica Italiana tenutosi a Firenze nel 2012.
Abstract:
Deacidification of raw oils is the first step towards a low-cost biodiesel (BD) production. The
authors propose a method of deacidification based on the esterification of free fatty acids
(FFA). Two acid resins, Amberlyst®46 (A46) and Purolite®D5081, and sulphated zirconias
(SO4=/ZrO2) were used as catalysts. The outcome of this study shows that the two resins do
not incur into chemical or mechanical deactivation giving a very stable performance over
time. Differently, inorganic catalysts incur in fast deactivation due to active groups leaching
[1]. The authors have moreover found that there is a linear correlation between the FFA
concentration and the number of active acid sites on the catalyst’s surface. This finding was
also possible thanks to the use of the software PROII (Simsci-Esscor’s) for the process
simulations. The pseudohomogeneous
model already reported in literature by the
authors and hereinafter displayed was used
[2]. Activities (a) are used instead of
concentrations. The adopted kinetic
parameters set is reported in Table 1. The
absolute values of the pre-exponential factors of the
Arrhenius equation (k0
i) were corrected so to take into
account the presence of both a second liquid phase and a
different type of catalyst. The adopted model resulted to be
in good correlation with the experimental data and to
estimate rather precisely the time needed for the complete
conversion of FFA for different oils (as way of example in
Fig. 1 the comparison is represented for a rapeseed oil with
an initial FFA concentration of 6%wt).
Tipologia IRIS:
14 - Intervento a convegno non pubblicato
Elenco autori:
A. Di Fronzo, D.C. Boffito, C. Pirola, C.L. Bianchi, S. Vitali, G. Carvoli
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