In Situ Transesterification of Spirulina Microalgae to Produce Biodiesel Using Microwave Irradiation

Table 7

Physicochemical characteristics of Spirulina microalgae biodiesel.

No.	Property	Test method	Limits ASTM D6751	Values of algae biodiesel
1	pH		7-9	7
2	Specific gravity	ASTM D-941	0.86-0.89	0.868
3	Flash point (°C)	ASTM D 93	100-170	164
4	Kinematic viscosity at	ASTM D 445	1.9-6.0	4.45
5	Acid value (KOH/g)	ASTM D 664	—	0.475
6	Free fatty acid value		—	0.95
7	Calorific value	ASTM D 240	—	32911.34
8	Moisture content	ASTM D 2709	0.050 max	0.001
9	Carbon residue	ASTM D 524	0.050 max	0.045
10	Ash content mass	ASTM D 482	0.0001	Nil
11	Sulphur	ASTM D 5453	0.0-0.0024	Nil