Making Diester?

crude vegetable oil, diester, bio-ethanol or other biofuels, or fuel of vegetable origin ...
Christophe
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by Christophe » 07/12/04, 21:06

The diester is made by extracting an esther (methyl I believe) based on HBV and using methanol. A fairly large amount of glycerin is obtained as a by-product.

Main problem: methanol (thus destroyed during the synthesis of the esther) is expensive and contains a substantial energy ... the sum of energy contained in the HBV + methanol (the reagents) is greater than that contained in the Diester (the product) ...

Here is a very brief explanation, by typing different keyword of this text you should find your happiness for a more detailed explanation ...
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by Misterloxo » 08/12/04, 20:06

I found it on the internet. BE CAREFUL ALL THE SAME !!!

Most of the following step-by-step instructions come from the book: From the Fryer to the Fuel Tank, How to Make Clean, Cheap Fuel from Joshua Tickell's Free Vegetable Oil from Greanteach Publishing in Saratosa, Florida. If you take seriously all the details, you have for your 19,95 $ and it is very well explained. I highly recommend it.


   Step 1

       * 1000ml of vegetable oil in a beaker of 1500 ml
       * 200ml of methanol (also called methyl alcohol, carbinol, methynol, spirit of wood *)
       * 4 g caustic soda ** (or sodium hydroxide) in a graduated Petri dish (if using used oil, instead of 4 grams of caustic soda, see step 1.5)

   Step 1.5

       If you use used or dirty vegetable oil, you will need to do a "titration" to determine how much additional caustic soda will be needed to neutralize the free fatty acids.

          1. Measure 1 gram of caustic soda on the graduation of the petri dish.
          2. Measure 1000 ml distilled water into one of the 1500 ml beakers.
          3. Pour 1 gram of caustic soda into the 1000 ml of water.
          4. Mark the caustic soda / water solution: do not drink.
          5. Measure 10 ml of isopropyl alcohol in a beaker of 20 ml.
          6. Dissolve 1ml of used oil in isopropyl alcohol.
          7. Label this beaker with oil / alcohol solution.
          8. Use a pipette to introduce 1 ml of water / caustic solution into the oil / alcohol solution.
          9. Check the pH with a litmus paper.
         10. Repeat steps 8 and 9, counting the ml of caustic / water you add, until the alcohol / oil reaches a pH between 8 and 9.
         11. Use the following equation: the number of ml of caustic / water mixture poured into the oil / alcohol mixture = x. and (x + 3.5) = the number of grams of caustic soda needed to neutralize one liter of hydrogenated oil.

   Step 2

       Combine methanol with caustic soda to create sodium methoxide, an extremely strong base that can dissolve the skin if touched and kill nerve endings so that you do not feel anything, so do not put your skin in contact with it .

       Pour the methanol into a blender. Then take the caustic soda and put it in the blender then mix at the lowest speed for 30 seconds or until all the caustic soda is dissolved in the methanol. You now have sodium methoxide.

   Step 3

       Carefully pour the vegetable oil into the blender. Mix at medium or high speed for 15 minutes.

   Step 4

       Pour into another container of 1500ml, if possible with a tap to drain the bottom. Let stand 8 hours. 75% of the reaction will be done the first hour. Do not drink, it's not Margarita. Eight hours later, the upper layer will be clear while the bottom layer will be dark and there may be a middle layer that will be half translucent. Although the reaction takes place in the first hour, the glycerin soap should settle to the bottom and let the methyl esters, biodiesel, at the top.

   Step 5

       If there is a faucet, try to empty the glycerin, and it alone. If it comes a little bit of biodiesel, it does not matter. It is important to you that you have the remaining biodiesel. If there is no faucet, do not pour, you would mix glycerine with biodiesel. Instead, use a hand pump (such as a ketchup bottle pump or window washer) or a water pump (fountain or aquarium). If you are very careful, you can use a ladle, and bailing carefully, but be careful not to stir or re-mix in glycerine. It is done !

       If you make larger quantities, then use x + 3.5g of caustic soda times the number of liters of oil you rush. Large quantities should also be mixed for at least 1 hours.

       If you wish, you can use thick glycerin and fine as industrial grade soap. Otherwise, glycerine is a biodegradable product.

* Methanol or methyl alcohol is manufactured by sawdust fermentation and distillation of methyl alcohol. See my message on how to make alcohol for more details. You can also distil the product to wash the windows at 149F / 65C. Its main constituent is methyl alcohol.

** Caustic soda or sodium hydroxide (NaOH) is the active component in sewer products. Also by electrolysis, you can mix hot water and table salt (NaCl) and you put the electrodes of a battery of 12 volt on the other side of the solution to get oxygen and hydrochloric gas (very dangerous, do not inhale) and there is a solution of sodium hydroxide. I also heard about using white wood ash coming from a very hot fire (oak and apple wood are the best, whatever would go) and rainwater, any other undistilled water asking for some baking soda. Fill a barrel or container up to about 15 cm from the top. Add enough water for the ashes to make a coat but do not stay in suspension. Let stand 4 at least (all night). Collect brownish water in a container that will contain your homemade caustic soda. If an egg or potato floats to its middle or a chicken feather begins to dissolve in it, the caustic soda water is almost ready. If the egg does not float or you want a stronger solution, boil it.
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bob_isat
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by bob_isat » 23/09/05, 18:14

What is the use of caustic soda knowing that the alcohol to burn is enough to shorten the carbon chains of the oil and thus fluidify it?

http://short.petrol.free.fr
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by Former Oceano » 23/09/05, 21:13

Adding soda accelerates the reaction and ensures that all the fatty acids are esterified.
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by bob_isat » 27/09/05, 12:34

it's interesting.
The advantage of not using soda is that the waste product is biodegradable (glycerin). If we put soda I'm not sure that it's great ... Need to inquire
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