my children are making BD for a school project using the dr.pepper method.we used 1L of virgin oil+200ml methanol+6g lye.my son shook it as i put away the methoxide mix.he shook it a very long time like 10 min.he said it turned dark then went kinda milky yellow.it has been 20 min and all we see is milky yellow with globs of what looks like clearish snot.should we start over or will it still seperate with time?
Was the lye KOH or NaOH?
it is sodium hydroxide lye.weve had just a little bit of seperation.with the dr pepper bottle holding one ltr.we have what appears to be about 1 inch of BD on top the rest is thick creamy gel.
we tried a second bottle and shook it for about 10-15 sec. this one left us with a nice seperation which left about 1 1/2 inch of clear amber colored liquid on bottomn and cloudy amber for the rest.we dont understand why the different results and are looking for any help since we are wanting to make BD for our farm use.
your oil must have a high water content? have you done a hot pan test on the oil before adding any chemicals?
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Do a search for messages by member Fuelfarmer, like this:
If you have not tested the VO for water, then it's like 'shooting craps' when wet oil is used.
Learn how to test for wet oil.
If you are using new, unused vege oil you are over-dosing on the NaOH. Cut back to 3.5gm or 5gm/liter.
You must never use less than 6 grams to convert any new cooking oil to biodiesel. Its not uncommon for commercial plants to use as much as 8 grams. IF you use less than 6 grams your biodiesel will not pass the astm quality test.
I know its all over the internet to use 3.5 grams for new OIL but this got posted a long time ago and spread around. Most of it probably originates from the same source. I been around biodiesel for more than 10 years and do biodiesel consultant work from time to time.
Biodiesel for cleaner air and fuel independence!
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