Biomedical Engineering Reference
In-Depth Information
Darnoko determined the reaction rate constants for the reaction mechanism, and the
results are shown in Table 2. The rate constant for triglyceride to diglyceride is the lowest and
is therefore the rate determining step, identifying k1 as the rate constant for the rate law.
According to Nourredini and Zhu [12], when using a 6:1 ratio of methanol to soybean oil, a
2
nd
ordermechanism with a 4th order shunt mechanism is the most appropriate kinetics.
Table 2. Reaction rate constant k for triglyceride, diglyceride, and monoglyceride
hydrolysis over a temperature range of 50 to 65
°
C
Reaction rate constant, k
(wt% min
-1
)
R
2
Glyceide
Temperatutr (
℃
)
50
0.018
0.9865
55
0.024
0.9966
TG→DG
60
0.036
0.9822
65
0.048
0.9903
50
0.036
0.9940
55
0.051
0.9974
DG→MG
60
0.070
0.9860
65
0.098
0.9678
50
0.112
0.9733
55
0.158
0.9619
MG→Glycerol
60
0.141
0.9862
65
0.191
0.9843
2.2. Reaction Temperature
As shown in Table 2, reaction rate constants increased with increasing temperature,
indicating a quicker reaction. In another work, the effect of temperature on conversion was
analyzed. Similarly, with increasing temperature, the overall conversion increased. In both
