Try it with fresh cooking oil from your kitchen too, it should need much less lye to reach pH 8-9. The calculation The next step is to determine the amount of lye needed for the reaction. Take the number of milliliters derived from the titration and multiply by the number of liters of wvo to be transesterified. There is one more thing to be included in the calculation. Every liter of neat vegetable oil (fresh - never been cooked) needs.5 grams of lye for the reaction. So for every liter of wvo to be transesterified add an additional.5 grams of lye.
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Important : Phenolphthalein has a shelf life of about a year, it is very sensitive to degradation by light so after a while it will start giving erroneous readings. Using a graduated eye dropper (with increments marked in tenths of milliliters) or some other calibrated instrument (from medical supply outlets while carefully keeping track of the amounts, drop measured amounts of the lye/water solution a couple of tenths of milliliters at a time into. Follow each drop with vigorous stirring of the solution. In cold weather the wvo might congeal and not work so you might need to do the titration in a heated room. If conditions are right eventually the solution turns pink (magenta and stays pink for 10 seconds. This is the indicator color for a pH range of 8-9 (see the photograph in the left column of this page, "Color of titrated liquid sample when at the correct. It's important to find the exact amount, to just reach this pH without dropping in too much! It's a good idea to do this entire process more than once to ensure that your number is correct. I've found that depending on the type of wvo, how hot it got in the fryer, what was cooked in it and how long it was used, the amount of lye/water solution needed to titrate it is usually.5 to 3 milliliters. You can also use litmus paper or a digital pH tester instead of the phenolphthalein.
Important : The lye must be dry - keep it away from water, store it in an airtight container. Make up a solution of one gram of lye to one liter of distilled water. Make sure it dissolves completely. This sample is then used as a reference tester for the titration process. It's important not to let the sample get contaminated, it can be used for many titrations. Mix 10 milliliters of isopropyl alcohol in a small container with a 1 milliliter sample of wvo - make sure it's exactly 1 milliliter. Take the wvo titration sample from the reaction vessel (Figure 5 1) after it's been warmed up and stirred. Add to this solution 2 drops of phenolphthalein, an acid-base indicator engelsk that's colorless in acid and red in base.
Or drain water puddles out from the bottom as they form - you can save any oil that comes out with the water later. When boiling slows, raise the temperature to 265 deg F (130 deg C) for 10 minutes. Remove heat and allow to cool. You may be lucky and find a regular source of wvo that doesn't need to have the water boiled off, in which case don't do it - boiling means extra energy and time. Personally i don't boil off the water first, i'd rather avoid the extra step in the process and save the energy it uses. But unless you're sure, it may be better to be on the safe side. Titration to determine the correct amount of lye required, a titration must be performed on the oil being transesterified. This is the most difficult step in the process, and the most critical - make your titration as accurate as possible.
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At both ends of each line segment is a carbon atom. Figure 1 In Figures 2 and 3 these zigzags are shorthanded as R1, 2 and. Figure 2 Figure. Filtering Filter the wvo to remove food particles. You may have to warm it up a bit first to get it to run freely, 95 deg F (35 deg C) should be enough. Use a double layer of cheesecloth in a funnel, or day a restaurant or canteen-type coffee filter. Removing the water Many people heat the wvo first to remove any water content.
Waste oil will probably contain water, which can slow down the reaction and cause saponification (soap formation). The less water in the wvo the better. Mike and joe, an organic farmer who makes 40 gallons of biodiesel a week for the farm truck and tractor. This is how they. Raise the temperature to 212 page deg F (100 deg c hold it there and allow any water to boil off. Use the mixer to avoid steam pockets forming below the oil and exploding, splashing hot oil out of the container.
Saponification is soap making. To make soap you take a transfatty acid or triglyceride (oil or kitchen grease) and blend it with a solution of sodium hydroxide (naoh, caustic soda or lye) and water. This reaction causes the ester chains to separate from the glycerine. These ester chains are what becomes the soap. They're also called lipids. Their unique characteristic of being attracted to polar molecules such as water on one end and to non-polar molecules like oil on the other end is what makes them effective as soap.
In transesterification, lye and methanol are mixed to create sodium methoxide (na ch3O-). When mixed in with the wvo this strong polar-bonded chemical breaks the transfatty acid into glycerine and also ester chains (biodiesel along with some soap if you're not careful (more on that later). The esters become methyl esters. They would be ethyl esters if reacted with booze (ethanol) instead of methanol. Figures 1-3 show these two reactions. The zigzag lines in the triglyceride diagram (Figure 1) are shorthand for carbon chains.
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Washing : Vinegar, water "make fuel from used kitchen grease" by mike pelly in the jan/Feb 2001 issue. Procedure, filter, wVO to remove any food scraps or solid particles. Heat wvo to remove any water content (optional). Perform titration biography to determine how much catalyst is needed. Heat wvo, mix in the sodium methoxide while stirring. Allow to settle, remove the glycerine. This procedure is called transesterification, similar to saponification.
Always have a maken hose running when working with them. The workspace must be thoroughly ventilated. No children or pets allowed. Safety for further information. Making biodiesel, ingredients, mixture : Waste vegetable oil (WVO) - used cooking oil, fryer grease, animal fats, lard. Methanol (CH3OH) - 99 pure, sodium hydroxide (naoh - caustic soda, lye) - must be dry. Titration : Isopropyl alcohol (rubbing alcohol) - 99 pure. Distilled water, phenolphthalein solution (not more than a year old, kept protected from strong light) - "Phenol" or "Phenol Red" from swimming pool or hot tub supply stores may not be the same as phenolphthalein; it can be used but the directions for use may.
: wear proper protective gloves, apron, and eye protection and do not inhale any vapors. Methanol can cause blindness and death, and you don't even have to drink it, it's absorbed through the skin. Sodium hydroxide can cause severe burns and death. Together these two chemicals form sodium methoxide. This is an extremely caustic chemical. These are dangerous chemicals - treat them as such! Mike makes front-page news in The seattle times, september 30, 2002: "cooking oil can fuel the car after it helps feed the driver".
Mike pelly lives in the us north West. "I live for renewable energy projects he says. Mike's been making his own biodiesel fuel from waste cooking oil for the last five years, short using it in several different cars. He finds it "far superior" to fossil-based diesel fuel. Mike sent us a full report on how he makes biodiesel. "It's a result of my work over the past five years along with contributions from other experimenters he said. "Pass it along to anyone you please." Here. Mike's new biodiesel processor, biodiesel From Used Kitchen Grease or Waste vegetable oil by mike pelly, this is how to make your own biodiesel fuel from used cooking oil. The oil - waste vegetable oil (wvo used fryer grease, animal fats, lard - is often free for the taking.
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Spanish version - versión en español. Getting ready for the fair. Mike promotes biodiesel wherever he can. Mike pelly is a true renewable energy hero. From the mid-1990s, mike's biodiesel recipe pioneered the revolutionary idea that ordinary people could make their own fuel and it's better than the stuff Big Oil makes, as well as cheaper, and better for the planet too. Where mike led the way, others followed, and now there are better, more efficient ways of doing it, along with simple and accurate quality checks that ensure that your home-brewed fuel is safe to use in any diesel including the high-tech common-rail and tdi diesels. Mike's method is kept here permanently as a reference and a tribute it's an important part of our heritage. To make your own biodiesel, start.