Quote:
Originally Posted by rcounts
They don't have to. If you are collecting thousands of gallons a week and mixing it all together you'll arrive at an average quality for the oil and then you gear your process to that. The food particles and junk in the oil are all filtered out early in the process, and another trick is to use just a touch more lye than what the oil's ph actually requires. Most of the remaining impurities drop out of the bio with the glycerol in the settling phase of production, and when you are recovering the excess methanol the excess unreacted lye hooks up with the fatty acid molecules and drops out as soap. Using these kind of methods they only have to do periodic random sampling to make sure things stay on track.
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That's the point, you do need to demonstrate that every batch BD meets fuel standards if you plan on selling it to anyone with a vehicle under warrantee without being sued (assuming the BD producers can convince the engine manufacturers to endorse it's use beyond B5). If the BD produces do not do that, they will always be marginal. If they ever get to the point where they can sell high quality fuel that is approved for new vehicles, they will become relevant. Until then, it's just a sideshow.