Table 1.
Physicochemical properties of recycled vegetable oil.
| Property | Refined soybean oil | Recycled vegetable oil from SBE (soybean oil) | Oil extracted from SBE (soybean oil)12* |
|---|---|---|---|
| Density (kg/m3) | 0.912 | 0.889 | 0.88 |
| Color | Pale yellow | Yellow | Dark brown |
| Viscosity (cP at 25 °C) | 39.5 | 65.5 | 84–96 |
| Saponification value (mg/g) | 198.95 | 209.3 | 185 |
| Free fatty acid (FFA) % | 0.32 | 53.67 | 24.1 |
| Total acid value (mg/g) | 0.64 | 89.9 | 87.6 |
| Iodine value (g/100g) | 122.6 | 64.7 | – |
| Peroxide value (meg O2/kg) | 50.76 | 76.44 | – |
| Flash point | 262.2 | 289.7 | – |
| Molecular weight (g/mol) | 829.61 | 858.45 | – |
| Fatty acid composition (%) | |||
| Palmitic acid (C16:0) | 10.44 | 34.79 | 57.9 |
| Stearic acid (C18:0) | 4.67 | 15.69 | 22.6 |
| Oleic acid (C18:1) | 24.79 | 41.45 | 19.5 |
| Linoleic acid (C18:2) | 57.8 | 8.08 | 0 |
| Linolenic acid (C18:3) | 2.3 | 0 | 0 |
| Reference | This work | This work | 12 |