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    Re: Full volume of a 20L cubie?

    3DB I heated a round bottom boiling flask in a pan of hot vegetable oil. During the experiment the oil overflowed on the hot heating element. Vegetable oil expands in volume as it gets hotter. ...
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    Re: Using the tote?

    I didn't express what I meant to write simply. It's likely that with elevated temperature the plastic in a tote would be more vulnerable to chemical attack. I made methyl salicylate once, putting...
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    Re: Using the tote?

    I made biodiesel from new corn oil , potassium hydroxide , calcium oxide and methanol in a 1 liter glass bottle at room temperature. It's not all that slow. A problem was keeping the methoxide...
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    Re: Can I reprocess if failed 27/3 test?

    Under reacted biodiesel would have mono and di glycerides in it. Not titrating may cause soap excessive due to possible high titrating oil. I would experiment with 1/2-1 litre product in washing to...
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    Re: My first wash. AARGGHH

    I was interrupted while typing a reply. To continue, I made potassium or sodium soap from sodium or potassium hydroxide, on purpose. So I made normal soap. I put maybe 1/4 gram of the known...
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    Re: My first wash. AARGGHH

    Acetic acid is a stronger acid than free fatty acids. The sodium or potassium salt of free fatty acids (soaps) switch the sodium or potassium to acetic acid giving sodium acetate salt and the free...
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    Re: My first wash. AARGGHH

    With my purified biodiesel distilled water poured right through it to form two layers (phases) quickly. So there maybe another issue. If soap content is an issue sodium chloride, table salt, might...
  8. Re: Practicalities of measuring liquids on a larger scale

    Vegetable oil expands when it is heated. I had a hot vegetable oil bath overflow due to expansion of the hot oil. I don't know how to calculate that mathmatically. It might be measured...
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    Re: Foolproof Room Temperature (FRT) Biodiesel

    Dr Mark Are you still drying your methoxide solution prior to the transesterification reaction? Maybe drying with cement? Le Chatlier's principle would indicate one advantage to that in the...
  10. Re: The chemistry of the glycerol (and soap) phase

    smithy: The equilibrium Dr Mark refers to is calculated mathmatically by multiplying the concentration of the products of a reaction divided by the concentration of the reactants of a reaction. This...
  11. Re: The chemistry of the glycerol (and soap) phase

    Tony from West Oz; The molecular mass is calculated by adding the atomic mass of the elements present in the molecule. Hydrogen 1.00794 oxygen 15.9994 carbon 12.011 potassium 39.0983 the units used...
  12. Re: The chemistry of the glycerol (and soap) phase

    What information do I get from the graph? It looks like as the methoxide concentration at 25 degrees centigrade increases so does the water. I don't know the units used in the graph, under...
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    Re: Foolproof Room Temperature (FRT) Biodiesel

    Dr Mark You asked for my reference on drying alcohol, but I can't find where the question was. My reference is Textbook of Practical Organic Chemistry , Longman (publishers) , by Arthur Vogel , 3rd...
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    Re: Foolproof Room Temperature (FRT) Biodiesel

    I used the regular D.P method with new vegetable oil , potassium hydroxide , strong mixing , new dryish methanol to react at room temperature. I mixed it for maybe six hours with strong mixing. ...
  15. Re: The chemistry of the glycerol (and soap) phase

    My reference to drying ethanol is from "A Text-Book of Practical Organic Chemistry" author Arthur I. Vogel , publisher Longman Group Limited , Third Edition, pages 166-167 in the article titled...
  16. Re: The chemistry of the glycerol (and soap) phase

    Dr. Mark; The constant of acidity of methanol is given as 2.9 times ten to the minus 16 power. That's a pH measurement. Methanol is a weak acid as is ethanol. That's the equilibrium constant at...
  17. Thread: Fat fail

    by WesleyB
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    Re: Fat fail

    If by "fat" you mean tallow or lard, then it might be wet. A formula for sodium soap is fatty acid triglyceride plus sodium hyroxide in the presence of water yields soap plus regenerated water via...
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    Re: Confusing problem with my biodiesel

    Purity of sodium hydroxide can be an issue. When exposed to air carbon dioxide gas reacts with sodium hydroxide solid to form a carbonate. So sodium hydroxide can degrade also. I distilled water...
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    Re: Confusing problem with my biodiesel

    Biodiesel is a methyl fatty acid ester. It is usually made by transesterification, which is described in an organic chemistry book I have. Biodiesel is made from a glyceride tri-fatty acid ester....
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    Re: Foolproof Room Temperature (FRT) Biodiesel

    I re did calculations for lard using an old organic chemistry book for free fatty acid lard composition. The internet gave density of lliquid lard as 917 grams per litre. So, The average molecular...
  21. Re: Formation of soap during biodiesel manufacture

    I calculated the pH of ethyl alcohol years ago. I don't remember what it was rather that it was a very weak acid. Similarly glycerol is probably a very weak acid, being a polyol / poly alcohol. ...
  22. Re: The chemistry of the glycerol (and soap) phase

    Dr Mark; I believe in the formulas you have not accounted for wetness in waste vegetable oil. You described the neutralization reaction (acid+base--> salt + water) but you did not describe...
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    Re: Foolproof Room Temperature (FRT) Biodiesel

    You're right Tilly about the 1/3 2/3 proportion in Biodiesel-glycerine excess methanol distribution. Sorry about that error. I try to be accurate. I have demethed crude biodiesel in a vaccum...
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    Re: Foolproof Room Temperature (FRT) Biodiesel

    Tilly you wrote the glycerine produced in making biodiesel is about 7.9% of glycerol per litre of oil used. I calculated it myself but my calculation is 69 1/3 milliliters of glycerine produced per...
  25. Re: The chemistry of the glycerol (and soap) phase

    "it will obviously react first with the Free Fatty Acids" . There is reaction rate to consider. I made soap from fairly pure hot/soft octadecanoic acid (present in vegetable oils and animal fats)....
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