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Single Stage Base Processing is the method most often used recipe for biodiesel. There is no one single recipe for biodiesel that will fit everyone's needs. That's because, we make compromises when building our recipe. Quality and Cost are the two major influences the compromise.
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Two stage base processing is splitting processing into two steps with a draining of raw glycerine in between two mixing stages. We use these recipes to improve quality or reduce costs further than can be done with single stage recipes.
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Two stage acid/base recipes increase yeilds by converting FFA into biodiesel instead of converting it into soap. Acid Base processing is an advanced technique and is not for beginers.
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Beginners and Experts alike will sometimes take shortcuts that result in bad batches, like skipping the test batch, or not checking their oil for water. When we make a bad batch we want to fix it. After all, we have invested time and money in this oil and want to get it back in the form of biodiesel.
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The concept is that you add water after the reaction is complete, but before settling has started. This helps the settling process, giving a faster more complete settling. Testing has shown a 30% to 50% reduction in soaps in the unwashed biodiesel. I have seen 95% settling in as little as 30 minutes.
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You can lower the titration number of your WVO by using a technique I'm calling Glycerin Stripping. It's really simple, you add the raw glycerin from a previous batch to your WVO, heat, stir, settle, and decant. The treatment not only reduces the titration number, it also reduces the methanol needed for processing, lowers water content, and cleans the oil before processing.
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This method was posted on the infopop forum by uniquewater in September of 2006. It is a variant on caustic stripping with lye. The WVO in the pictures was lowered from a KOH titration of 10ml down to 1ml!
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Making Biodiesel for winter consumption calls for a little extra work since biodiesel made from WVO tends to have a higher gel point than petroleum diesel. This article covers some of the methods we use to suppress gel point in biodiesel.
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How to make your own biodiesel at home
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