Biodiesel washing

[WesleyB]

Part of it sounds like soap in the biodiesel . A dry wash with prepared wood chips might be the ticket . Testing small amounts , like 500 milliliters . Am expensive dry wash is technical grade magnesium silicate . Remove the glycerine layer , Demeth the product , dry wash , may produce an adequately pure product .

[Cookie]

Hi everyone,
I’ve been working on washing biodiesel and I’ve run into a few issues I’d love some insights on.

Issue 1: Gel-like Layer Formation
Some of my biodiesel samples separate instantly upon water washing, but after a while, a gel-like layer forms on top. When I heat it gently, it turns back to a liquid, but on cooling, it condenses back to a gel again.
➡️ Should I continue washing with warm water?
➡️ I’ve read that adding acid (like vinegar or phosphoric acid) or salt can help break this type of emulsion. Has anyone tried this effectively?

Issue 2: Milky Appearance on Washing
Another sample turns milky immediately when water is added. I tried heating it, and it did become almost clear after a while. But once the heat is removed, it turns milky again.
➡️ What might be causing this?
➡️ Is this a typical emulsion behavior, or could it be soap formation?

What’s the best approach to deal with stubborn emulsions?
I’d love to hear from those who’ve encountered similar challenges. Any advice or proven methods would be appreciated!