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Procedure By: Samuel (Reuben) Gurupatham |
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Procedure
- Water Content
Determine the mass of an empty beaker
using an electronic scale. Then, add 10mL of Jatropha Oil to the beaker and
record the mass again. Calculate the mass of the oil by subtracting the empty
beaker mass from the oil and beaker mass. Next, separately weigh 1g of calcium
chloride and add it to the beaker containing the Jatropha oil. Place the beaker
on a hotplate at a temperature of 1000C for one hour. After the
heating of the oil, record the mass of the jatropha oil again and calculate the
difference in weights. Use the following formula to calculate the water content
(%) of Jatropha Oil. Water Content = (d / t) x 100 Where: d, represents the difference in oil
weights in g.
t, represents the mass of the oil before heating in g. Procedure
– Iodine Value Pour
2.5mL of Jatropha Oil into an Erlenmeyer flask. Add 20mL of cyclohexane and 25mL
of Wijs reagent into the same flask. Mix the flask contents thoroughly and store
the solution at a temperature of 200C for thirty minutes. After
thirty minutes, add 10mL of ‘15% Potassium Iodide Solution’ and 100mL of
water to the solution. Record the mass of the solution using an electronic
scale. Mix the contents thoroughly and titrate the solution with 0.1N of sodium
thiosulfate until the yellow colour has disappeared. Then add 1mL of starch
indicator to the flask and mix the contents while titrating the solution with
0.1N of sodium thiosulfate until the blue colour has disappeared. Calculate the
iodine value (mg of iodine/g of oil) using the following formula. Iodine value = (S) (0.01269) (100) / W Where: S, represents the volume of sodium
thiosulfate required to titrate the solution in mL.
W, represents the weight of the sample
titre in g. Procedure
– Acid Value In
an Erlenmeyer flask, dissolve 1mL of Jatropha Oil into 10mL of isopropyl
alcohol. Then add two drops of phenolphthalein solution and mix the flask
contents thoroughly. Titrate the solution with 0.1mol/L of sodium hydroxide
until the solution stays pink for 10 seconds. Use the following formula to
calculate the acid value. Acid Value = (A x M x 40) / W Where: A, represents amount of sodium
hydroxide used to titrate the solution.
M, represents the morality of the
sodium hydroxide
W,
the weight of the Jatropha oil Oxidation
Stability Procedures Experiment
1 – Jatropha Oil Determine
the moisture content, acid value and the iodine value of Jatropha Oil. Next, use
a hot plate to subject some more oil to 700C for 45 minutes in the
presence of oxygen. After the oxidation period, determine the acid value and the
iodine value again. Repeat this process two more times to determine mean values.
Experiment
2 – Jatropha Oil and TBHQ solutions Measure
9.5mL of Jatropha Oil into a beaker. Measure 0.5mL of TBHQ into a separate
beaker. Combine the two substances and mix until the TBHQ is dissolved. Next,
use a hot plate to subject some more oil to 700C for 45 minutes in
the presence of oxygen. Determine the acid value and the iodine value of the
solution. Repeat the process two more times and determine the mean values.
Repeat the entire process three more times using a solution containing 9.0mL of
Jatropha Oil and 1.0mL of TBHQ. Experiment
3 – Jatropha Oil and IRGASTAB BD 100 solutions Measure
9.5mL of Jatropha Oil into a beaker. Measure 0.5mL of IRGASTAB BD 100 into a
separate beaker. Combine the two substances and mix thoroughly. Next, use a hot
plate to subject some more oil to 700C for 45 minutes in the presence
of oxygen. Determine the acid value and the iodine value of the solution. Repeat
the process two more times and determine the mean values. Repeat the entire
process three more times using a solution containing 9.0mL of Jatropha Oil and
1.0mL of IRGASTAB BD 100. |