This paper presents an analysis of the effect of two synthetic antioxidants on
the vaporization processes of coconut and linseed oils for fuel use. Several
studies agree on the effectiveness of synthetic or natural antioxidants against
the polymerization of vegetable oils. The principle of action of the latter is to
increase the rate of vaporization, to the detriment of polymer formation. The
droplet suspension technique where a fiber is used to hold a stationary droplet
has been used. The vaporization was conducted within a closed chamber un
der ambient pressure conditions in an inert and oxidizing environment at
temperatures of 703 K. The method involves monitoring the projected surface
area of vegetable oil droplet blended with antioxidants. The projected area
(mm2) of the droplet during the vaporization process as a function of time (s)
has been used to determine the vaporization coefficient, or the residue for
mation rate. The main findings are that the two antioxidants used at 200 ppm
and 500 ppm have no influence on the vaporization of saturated oils like co
conut, while on unsaturated oils like linseed the two antioxidants appear to
reduce slightly the deposition of residues which are identified as polymers and
increase slightly vaporization rate. In practice, antioxidants could be used as
additives in vegetable oils to facilitate their combustion in diesel engines, rep
resenting a potential solution for improving combustion efficiency. To en
hance the reliability of the findings, it would be advisable to increase the num
ber of antioxidants and extend the study to encompass a wider range of vege
table oils.

Synthetic Antioxidant, Linseed Oil, Coconut Oil, Polymerization, Vaporization, Diesel Engine, Deposits