Originally Posted by Gun-Driver
Murph,
Does mixing in the old glycerol with the new oil also lower the amount of methanol used to make the next batch, if so by how much?
The technique is basically making biodiesel by using the excess chemicals left over in the glycerin.
Part of your waste vegetable oil will be well on its way to becoming biodiesel..
So basically, your 100% waste veg oil starts to become 95% waste oil with 5% biodiesel mixed in (in laymans terms).. When you throw that into the reactor, since some of it is already biodiesel, you require less everything to convert the rest of it.
The numbers I quoted all above are for example only and I have no exact figures to give you.. But, it has been confirmed that it will lower your titration levesl and require less chemicals for the next batch.