Optimization of Sunflower Oil Transesterification Process Using Sodium Methoxide

Table 4

Comparison of the fuel properties of the biodiesel resulted from the optimal condition, with ASTM D 6751 standard.

Fuel properties	Unit	Value	Standard limits	Standard methods
Specific gravity at 15°C	—	0.87	0.86–0.90	ASTM D 287
Kinematic viscosity at 40°C	m^2/s	4.1×10^−6	3.5×10^−6−5×10^−6	ASTM D 445
Flash point	°C	150	≥100	ASTM D 93
Pour point	°C	0	—	ASTM D 97
Ash content	w/w%	0.008	≤ 0.01	ASTM D 482
Cloud point	°C	2	−1	ASTM D 2500

ASTM; American Standards for Testing of Materials [28–34].