I use adsorbances to wash biodiesel instead of water washing. So I need to determine soap in my biodiesel after adsorbed. But when I was titrating for base catalyst, one of my adsorbance didn't change the color of phenophthalein at all. Then I tested biodiesel with universal indicator paper, it showed that my biodiesel is an acidic (pH~5 or 6) and when I dissolved my adsorbance with deionized water, it is an acidic too (pH~3 or 4). It means my adsorbance turns biodiesel to be an acidic. If I want to compare their efficiency for soap adsorption, How can I do with my acidic biodiesel??
Pls.help me find out the answer T_T!!
First, how are you washing your biodiesel? If you are using ion exchange, your soaps are being converted back into their constituent free fatty acids (which raises total acid number).
Check this link out for how to do the soap test
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