Table 3.
Physicochemical properties of biodiesel with methanol: oil of 6:1, reaction time of 3 h, catalyst load (3%wt.), and temperature at 65 °C.
| Physicochemical properties | Result (Mean ± SD) | Standard [ASTM D6751] |
|---|---|---|
| Moisture (%) | 0.03 ± 0.50 | 0.050 |
| RI (at 25 °C (nD) | 1.46 ± 0.01 | 1.45 |
| pH | 5.40 ± 0.21 | 6.99 |
| Density (g/cm3 at 25 °C) | 0.88 ± 1.03 | 0.82–0.90 |
| Cloud point (°C) | 1.10 ± 0.40 | -3-12 |
| Pour point (°C) | 2.10 ± 1.09 | -5-10 |
| Flash point (°C) | 160.00 ± 2.01 | 130 |
| Acid value (mg KOH/g) | 0.62 ± 0.23 | ≤0.8 |
| %FFA (mg KOH/g) | 0.30 ± 0.56 | 2.5 |
| Iodine value (g I2/100 g) | 60.00 ± 0.30 | 80–106 |
| Saponification value (mg KOH/g) | 162.35 ± 0.47 | 150.1 |
| PV(meq O2/kg) | 3.00 ± 0.59 | 8 |
| Cetane number | 89.06 ± 1.70 | ≥50 |
Key: BPWCO = Biodiesel from purified waste cooking oil, PV = peroxide value.