Working with low temperature and high catalyst levels MG, DG
and TG content varied from (0.74–0.79%), from (0.005–0.008%) and
from (0–0.01%) respectively.
The T–C interaction is negative with significant influence on the
biodiesel purity (Fig. 8(a)), thus at high level of temperature and
catalyst concentration the purity decrease slightly from (99.25–
99.10%) (Fig. 8(b)), this is may be due to that the sample was with
very low free fatty acids content. At high levels of temperature and
catalyst the purity decreases.
So from an economic point of view and to produce a biodiesel
with acceptable purity (>99%) (Fig. 8(b)) we should work at a low
temperature and catalyst levels.