Optimization by Response Surface Methodology of Biodiesel Production from Podocarpus falcatus Oil as a Cameroonian Novel Nonedible Feedstock

Table 6

Physicochemical properties of PFO and biodiesel compared to ASTMD6751.

Properties	Units	PFO	Biodiesel	Diesel	ASTMD6751
Density (at 15°C)	kg/m^3	922	872	845	880
Viscosity (40°C)	mm^2/s	29.53	3.58	2.4	1.9-6
Pour point	°C	-8.6	-15.20	−17	-15 at -16
Calorific value	MJ/kg	39.47	39.87	42.54	35
Cetane number	-	42.06	51.03	50	48–60
Acid index	mg KOH/g	1.90	0.40	-	Max. 0.5
Iodine number	g I2/100 g	147.10	103.10	-	-
Saponification index	mg KOH/g	189.11	195.44	-	-