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Negative BDG SAP value
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Recently I have had several questions regarding determining a SAP value. Some of these related to the BDG already having a pH greater than 10.5. This is an indication that there is excess caustic left in the BDG.

If the pH of your BDG is much greater than 10.5 you have a -SAP value. You will need to either neutralize the BDG with a weak acid such as citric acid or add enough of a whole oil or fatty acid to use up the extra caustic.

I have added instructions on how to determine a negative SAP for your BDG to the KNC SAP Test on my blog.

To quickly and easily work out a recipe for your -SAP (or +SAP) BDG you can use the KNC Soap Calculator.


-Rick

http://www.knicenclean.com your single-most largest free BDG soaping content on the internet.
SAP Testing, Ingredient Properties, Soap Glossary and Recipes just to name a few.

Making Biodiesel Byproduct Soap Learn how to use your biodiesel byproducts to make great bar and liquid soap!!!

"Closing the loop on biodiesel production one bar at a time!"

Beware of the Dunning–Kruger effect.
 
Location: S.E. Michigan | Registered: April 15, 2007Reply With QuoteReport This Post
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quote:
If the pH of your BDG is much greater than 10.5 you have a -SAP value.

That's something I wasn't aware of. I'd dissolve BDG in equal amount of distilled water (by volume) to check ph. Dilution would effect the ph results I would think.
 
Location: western new york | Registered: November 19, 2008Reply With QuoteReport This Post
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I usually just check the BDG by dripping some water on it and making a slurry.
That works well for pH paper to get a "ball park".
But if you are going to be using your meter, dissolving the BDG into distilled water would work really well.


-Rick

http://www.knicenclean.com your single-most largest free BDG soaping content on the internet.
SAP Testing, Ingredient Properties, Soap Glossary and Recipes just to name a few.

Making Biodiesel Byproduct Soap Learn how to use your biodiesel byproducts to make great bar and liquid soap!!!

"Closing the loop on biodiesel production one bar at a time!"

Beware of the Dunning–Kruger effect.
 
Location: S.E. Michigan | Registered: April 15, 2007Reply With QuoteReport This Post
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