Table 2.
Compositions of refined glycerol and crude glycerol
| Analysis | Result | Analytical methods |
|---|---|---|
| Refined glycerol | ||
| Glycerol content | 99.5 wt % Min | A.O.C.S. Ea 7–50 |
| Specific gravity | 1.26 Min | A.O.C.S. Ea 7–50 |
| Color (APHA) | 10 Max | Lovibond |
| Heavy metal | 5 ppm Max | BS 5711: Part 15 |
| Water content | 0.5 wt % Max | Karl fisher |
| Combustibles | 0.01 wt % Max | USP-30 |
| Arsenic | 1.5 ppm Max | BS 5711: Part 10 |
| Diethylene glycol | 0.1 wt % Max | USP-30 |
| Sulfate | 0.002 wt % Max | USP-30 |
| Iron | 10 ppm Max | USP-31 |
| Crude glycerol | ||
| Total organic carbon | 300.9 g/L | Total organic carbon analyzer |
| Glycerol content | 50.2 wt % | HPLC |
| Methanol content | 12.0 wt % | GC |
| Organic fraction | 38.4 wt % | GC |
| Lauric acid (C12:0) | 1.0 wt % | GC |
| Palmitic acid (C16:0) | 5.4 wt % | GC |
| Stearic acid (C18:0) | 0.6 wt % | GC |
| Oleic acid (C18:1) | 11.9 wt % | GC |
| Linoleic acid (C18:2) | 17.7 wt % | GC |
| Linolenic acid (C18:3) | 1.8 wt % | GC |