Research Article
In Situ Transesterification of Spirulina Microalgae to Produce Biodiesel Using Microwave Irradiation
Table 3
Physicochemical properties of Spirulina microalgae oil.
| No. | Property | Test method | Limits ASTM D6751 | Values of algal oil |
| 1 | pH | — | 7-9 | 7 | 2 | Specific gravity | ASTM D 941 | 0.86-0.89 | 0.877 | 3 | Kinematic viscosity at 40°C mm2/s | ASTM D 445 | 1.9-6.0 | 5.76 | 4 | Acid value KOH/g | ASTM D 664 | — | 0.4 | 5 | Free fatty acid value | | — | 0.802 | 6 | Moisture content% | ASTM D 2709 | 0.050 max | 7.8 | 7 | Carbon residue % | ASTM D 524 | 0.050 max | < | 8 | Refractive index | | | 1.365 | 9 | Sulphur, wt% | ASTM D 5453 | 0.0-0.0024 | Nil |
|
|