From: Esterification of glycerol from biodiesel production to glycerol carbonate in non-catalytic supercritical dimethyl carbonate
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.
Commercial glycerol
99