Research Article
In Situ Transesterification of Spirulina Microalgae to Produce Biodiesel Using Microwave Irradiation
Table 5
Experimental matrix and results from RSM central composite design.
| Variables (actual) | Yield (%) | STD | Run | Catalyst Conc. () | Volume of CH3OH () | Reaction time () () | Experimental | Predicted |
| 3 | 1. | 1 | 12 | 3 | 37.56 | 38.5363 | 2 | 2. | 3 | 6 | 3 | 42 | 42.8006 | 11 | 3. | 2 | 4 | 6 | 38.32 | 37.6164 | 13 | 4. | 2 | 9 | 1 | 46.56 | 46.9381 | 6 | 5. | 3 | 6 | 9 | 63.76 | 63.9538 | 16 | 6. | 2 | 9 | 6 | 79.4 | 80.294 | 7 | 7. | 1 | 12 | 9 | 44.4 | 44.7695 | 17 | 8. | 2 | 9 | 6 | 80.66 | 80.294 | 9 | 9. | 0.32 | 9 | 6 | 49 | 48.0875 | 14 | 10. | 2 | 9 | 11 | 72 | 69.9672 | 20 | 11. | 2 | 9 | 6 | 83.43 | 80.294 | 8 | 12. | 3 | 12 | 9 | 69.96 | 71.8784 | 12 | 13. | 2 | 14 | 6 | 42.62 | 41.6688 | 19 | 14. | 2 | 9 | 6 | 78.12 | 80.294 | 5 | 15. | 1 | 6 | 9 | 48.958 | 50.8439 | 4 | 16. | 3 | 12 | 3 | 54.41 | 53.6942 | 18 | 17. | 2 | 9 | 6 | 78.75 | 80.294 | 1 | 18. | 1 | 6 | 3 | 42.39 | 41.6417 | 10 | 19. | 3.682 | 9 | 6 | 72.6 | 71.8578 | 15 | 20 | 2 | 9 | 6 | 81.12 | 80.294 |
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