Empirical modeling the ultrasound-assisted base-catalyzed sunflower oil methanolysis kinetics

Abstract

The ultrasound-assisted sunflower oil methanolysis catalyzed by KOH was studied to define a simple empirical kinetic model useful for reactor design without complex computation. It was assumed that the neutralization of free fatty acids and the saponification reaction were negligible. The methanolysis process rate was observed to be controlled by the mass transfer limitation in the initial heterogeneous regime and by the chemical reaction in the later pseudo-homogeneous regime. The model involving the irreversible second-order kinetics was established and used for simulation of the triacylglycerol conversion and the fatty acid methyl esters formation in the latter regime. A good agreement between the proposed model and the experimental data in the chemically controlled regime was found

Kinetic Study on Ultrasound Assisted Biodiesel Production from Waste Cooking Oil

“…This also indicates that synthesis of biodiesel from waste cooking oil with a sonochemical reactor is a reversible reaction. This is in disagreement with Vyas, et al [19] and Avramovic, et al [27], who employed ultrasound but used a 1 st and 2 nd order irreversible kinetic model (Table 1). Figure 5 shows the effect of molar ratio of reactant at 4:1, 5:1, 6:1, and 7:1.…”

Biodiesel production by methanolysis of waste lard from piglet roasting over quicklime

“…After centrifugation (3500 rpm; about 700 Â g) for 15 min, the upper layer was withdrawn, dissolved in a solution of 2-propanol and n-hexane (5:4 v/v) in a ratio of 1:200, and filtered through a 0.45 lm Millipore filter. The filtrate was used for HPLC analysis, as described by Avramović et al [37]. The experiments were conducted twice at 40°C, 50°C and 60°C.…”

“…The chemical composition of the ester phase of the reaction mixture (MAG, DAG, TAG and FAME concentrations) was determined by the HPLC method described in details elsewhere [37].…”

Comparing Ultrasound and Mechanical Steering in a Biodiesel Production Process

“…Usually these reactions are done with commercial ultrasonic devices that operate on the central frequency in the kilohertz range (kHz), especially between 20 and 50 kHz (Rokhina et al, 2009). That reactions has even been empirically modelled (Avramovi et al, 2012). Data on the effect of ultrasound on higher frequencies are scarce, despite some concurrent high frequency technique (microwave) has been shown effective (Nogueira et al, 2010).…”