Table 1 Properties of glycerol as by-product from different biodiesel production methods
Glycerol from different methods | Purity | Water (wt%) | Salt (wt%) | Soap (ppm) |
|---|---|---|---|---|
Alkali-catalyzed glycerol | 70 | 9.82 | 20.18 | 35,100 |
Supercritical methanol glycerol | >98 | n.d. | n.d. | n.d. |
Commercial glycerol | 99 | n.d. | n.d. | n.d. |