Is there a restriction on triglyceride content in biodiesel, in particular B20 ? My group have to make B20 (20%biodiesel and 80% fossil fuel-derived diesel).
For example, for B100, my group found that there is a standard that says you can only have .02 mass% free glycerine and .24 mass% total glycerine (which I would guess to include mono-, di- and tri-glycerides).
We decided to purchase soybean oil (no fatty acid) from a suplier so we don't have to deal with water.
I chose to run the reaction conditioned like figure #4, the middle one, on page 78 (at 150 C, 60 minutes).
So, after the reaction, we will have triglycerides, methanol, methyl esters, and glycerol. The biodiesel is the TG, so how could we separate TG from other compounds?
Since I was given liquid-liquid equilibrium table (distribution of MeOH between methyl esters and gylcerol), I assume that when we do separation, we'll get 2 streams, #1 contains TG, methyl esters, and MeOH, #2 contains glycerol and MeOH. Is this correct? How will this separation work?
I think I should recycle MeOH. My prof said I might need a distillation column. I don't understand why.