Glycerine is used in thousands of applications from cosmetics to explosives. You can even eat it...Yum! Unfortunately, glycerine from biodiesel is very crude and needs refining. Commercially it is steam distilled or fished out with resins, the problem is you need a huge amount of energy to purify it. Glycerine boils at about 280c but also decomposes at around this temp too....
However, it's possible to get a ~ 90% purity by cracking with acid (separating the FFA's/NaOH/Glycerol). So the aim is to make some high content glycerine soap....Watch this space.
However, it's possible to get a ~ 90% purity by cracking with acid (separating the FFA's/NaOH/Glycerol). So the aim is to make some high content glycerine soap....Watch this space.