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Used Cooking Oil

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Satish Lele

Materials for Titration
    Laboratory Equipments
  1. conical beaker 100 ml
  2. measuring cylinder 1 liter
  3. burettes 30 ml
  4. pipettes 5 ml
  5. test tubes 5 ml
  6. test tube stand
  7. burette stand
  8. bottles 200 cc
  9. pH paper
  10. weigh scale 100 gm
  11. round bottom flask 2 liters
  12. heating mantle
  13. condenser
    Laboratory Chemicals
  1. methanol
  2. Potassium Hydroxide
  3. isopropyl alcohol
  4. distilled water
  5. phenolphthalein solution
  6. acetone
  7. laboratory chemicals

Reagent: Dissolve 10 gram of KOH in 1 liter of distilled or de-ionized water (1% KOH solution).

Basic titration : In a smaller beaker, dissolve 1 ml of used cooking oil in 10 ml of pure isopropyl alcohol. Warm the beaker gently by standing it in hot water, stir until all the oil dissolves in the alcohol and the mixture turns clear. Add 2 drops of phenolphthalein solution to get end point.

Using a burette, add 1% KOH solution, drop by drop to the oil, alcohol, phenolphthalein solution, stirring all the time, until the solution stays pink (magenta) for 10 seconds. Note the number of milliliters of 1% KOH solution you used. The reading in milliliters (ml) gives you percentage of Free Fatty Acid content of used cooking oil.

Likely chemical analysis of Used Cooking Oil with 25% Polar Compounds

Typical Fatty acid Profile of such oil

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