You will nevewr get 100% back, some is consumned in the reaction, the 80-100% you are probably confusing with the percentage of purity.
This is similar to what I am getting. I use my processor (40 Gal HWH appleseed) with a GL condenser on the side. I am using a base/base formula with a total of 16.5-19L methanol/100 liter batch so there is slightly less methanol in my glycerin then a typical single stage process using 20-22% methanol. Here is what I get:
30 gallons of glycerol, takes about 8 hours, recover 5 gal methanol
I also distill the methanol out of the biodiesel before it goes into the wash tank. I start with 100L of oil and end up with about 89-95L (about 25 Gal) of biodiesel. From this biodiesel I recover about 1 gallon of methanol - takes about 3.5-4 hours.
Still working on getting my purity up a little higher. Currently getting between 88-95%. Good ideas everyone...
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