I make biodiesel using ethanol. There is no problem after heating and washing, but after drying, gelation occurs. Why?
You've got soap. Meaning water in your reaction.
How much water does your ethanol have in it?
water: ≤ 0.1 %
Super dry ethanol (99.9%) ? I didn't know anyone sells that. Anyway the catalyst has water in it and possibly your oil has water in it. I made ethyl biodiesel with 99.5% ethanol, 199 proof. I used potassium hydroxide with no problems. The only possible cause of your gelling is probably soap. I expect you should not wash your ethyl biodiesel with water, dry wash. I read a formula for making super dry ethanol for use in making barbituric acid and its derivatives. I didn't know anybody sells anhydrous industrial ethanol like that. . I was able to buy 99.5% ethanol, but not 99.9% anhydrous ethanol.
I thought about sources of water in the starting materials. I heated 157.3 grams of technical grade sodium hydroxide hot, to maybe 200 degrees centigrade under 100 millimeters atmospheric pressure in a vacuum still. I obtained a 3.9 gram loss of mass from the sodium hydroxide. So the sodium hydroxide that I used was at least 2.479% water. That's another source of water in the reaction. Your oil may have been wet. When I made biodiesel using new corn oil + potassium hydroxide + 99.5% ethanol + heat + mixing , I got a regular reaction with glycerine drop out as usual. It seems to me the only possible cause of your gelling is water in one of the starting materials.
Where do I find the "like" button?
Thank you, Tilly, and a beautiful "like" button it is.
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