where: r = reaction rate of transesterification; [TG] = oil concentration; [ML] = methanol
concentration; t = time; [TG]o = initial oil concentration; [ML]o = initial methanol
concentration; k = kinetic parameter; xTG = conversion of triglycerides.
The kinetic parameter (k) obtained by Cheng et al. (2004) at different experimental
conditions was used to construct the predictor curve of xTG vs. t as is drawn in Figure 1 like
dotted red line. Comparing the observed data and the predicted values of xTG by mean of
regression of minimum squares, the correlation coefficient (R2) resulted of about 0.96,
showing good quality of this theoretical kinetic model.
From data values of k tabulated by Cheng et al. (2004) at different temperatures and fixed
catalyst concentration and oil:methanol feed rate of 0.125 kg NaOH/kg oil and 1:10,
respectively, the activation energy (Ea) was determined and resulted 60737 J/mol with a
frequency factor (ko) of 9.153109 m3/(mol-s) for the condition of maximum velocity of
biodiesel production. Zapata et al. (2007) reported closely values Ea and ko (60701 J/mol and
9.1534106 L/(mol-s), respectively) also taken from for the transesterification reaction under
the preselected experimental conditions.
Moreover, palm oil can frequently content a level of free fat acids of about 3.8% p/p
(expressed in palmitic acid) which reacting with methanol to produce methyl palmitate and
water. This reaction of esterification can be described by the following rate expression of first
order (Eq. 3) proposed by Zapata et al. (2007).
where: r = reaction rate of transesterification; [TG] = oil concentration; [ML] = methanol
concentration; t = time; [TG]o = initial oil concentration; [ML]o = initial methanol
concentration; k = kinetic parameter; xTG = conversion of triglycerides.
The kinetic parameter (k) obtained by Cheng et al. (2004) at different experimental
conditions was used to construct the predictor curve of xTG vs. t as is drawn in Figure 1 like
dotted red line. Comparing the observed data and the predicted values of xTG by mean of
regression of minimum squares, the correlation coefficient (R2) resulted of about 0.96,
showing good quality of this theoretical kinetic model.
From data values of k tabulated by Cheng et al. (2004) at different temperatures and fixed
catalyst concentration and oil:methanol feed rate of 0.125 kg NaOH/kg oil and 1:10,
respectively, the activation energy (Ea) was determined and resulted 60737 J/mol with a
frequency factor (ko) of 9.153109 m3/(mol-s) for the condition of maximum velocity of
biodiesel production. Zapata et al. (2007) reported closely values Ea and ko (60701 J/mol and
9.1534106 L/(mol-s), respectively) also taken from for the transesterification reaction under
the preselected experimental conditions.
Moreover, palm oil can frequently content a level of free fat acids of about 3.8% p/p
(expressed in palmitic acid) which reacting with methanol to produce methyl palmitate and
water. This reaction of esterification can be described by the following rate expression of first
order (Eq. 3) proposed by Zapata et al. (2007).
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