Research Article
Response Surface Methodology Process Optimization of Biodiesel Production from Castor Seed Oil
Table 2
Physicochemical properties of refined castor oil.
| Parameters | Unit | Refined castor oil | ASTM standard value |
| Moisture content | | 3.72 | | Specific gravity | | 0.961 | 0.957–0.968 | Viscosity (at 40°C) | mm2/sec | 12.4 | 6.3–8.8 | Acid number | mL·KOH/g oil | 2.4 | 0.4–4 | Saponification number | mg·KOH/g oil | 185.2 | 175–187 | Iodine number | — | 86 | 82–88 | Cetane number | min | 56.4 | 47 | Heating value | MJ/kg | 40.6 | 37.5–42.8 |
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