Production de Biodiesel à partir d'Huile Végétale

Conversion de l'huile de cuisson en biodiesel par transestérification

Organic Synthesis Intermediate (High School) 60 min ~$12,00

Objectif

Convertir l'huile végétale en biodiesel (esters méthyliques d'acides gras) par transestérification catalysée en milieu basique avec du méthanol.

Contexte

Biodiesel is produced by reacting triglycerides (vegetable oil) with methanol in the presence of a base catalyst (NaOH or KOH). The process replaces the glycerol backbone with methanol, producing fatty acid methyl esters (FAME) that can fuel diesel engines. Glycerol is the byproduct.

Avertissements de sécurité

  • Methanol is toxic and flammable — work in fume hood
  • NaOH is corrosive
  • Do not heat methanol with open flames
  • Adequate ventilation is essential

EPI requis

goggles gloves lab_coat

Matériaux

  • Vegetable oil (100 mL)
    Clean cooking oil
  • Methanol (20 mL)
    Anhydrous
  • Sodium hydroxide (NaOH) (1 g)
    Catalyst
  • Distilled water (100 mL)
    For washing

Équipement

500 mL Erlenmeyer flask Hot plate with stirrer Separating funnel Thermometer Magnetic stir bar

Procédure

1

Dissolve 1 g NaOH in 20 mL methanol to create sodium methoxide. Stir until fully dissolved.

5 min Exothermic — methanol is flammable
2

Heat 100 mL of vegetable oil to 55°C in the Erlenmeyer flask on the hot plate.

5 min
3

Add the sodium methoxide/methanol solution to the warm oil. Stir vigorously.

2 min
4

Maintain temperature at 55-60°C and stir continuously for 30 minutes.

30 min Keep in fume hood
5

Transfer the mixture to a separating funnel and allow to settle for 15 minutes. Two layers should form.

15 min
6

Drain the lower glycerol layer (dark, viscous). The upper layer is crude biodiesel.

3 min
7

Wash the biodiesel layer gently with 50 mL warm distilled water. Allow to separate and drain the water.

5 min
8

Record the volume of biodiesel produced and calculate the conversion rate.

3 min

Résultats attendus

Two distinct layers: biodiesel (clear, amber upper layer) and glycerol (dark, viscous lower layer). The biodiesel should be less viscous than the original oil. Typical yield is 85-95% by volume.

Nettoyage

Glycerol can be disposed of down the drain (biodegradable). Dispose of methanol waste properly. Rinse glassware. The biodiesel should not be used as fuel without further purification.

Détails

Catégorie
Organic Synthesis
Difficulté
Intermediate (High School)
Durée
60 min
Coût estimé
$12,00
Étapes
8
Matériaux
4

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Frequently Asked Questions

What is the objective of Production de Biodiesel à partir d'Huile Végétale?
Convertir l'huile végétale en biodiesel (esters méthyliques d'acides gras) par transestérification catalysée en milieu basique avec du méthanol.
How difficult is Production de Biodiesel à partir d'Huile Végétale?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for Production de Biodiesel à partir d'Huile Végétale?
Key safety precautions include: Methanol is toxic and flammable — work in fume hood; NaOH is corrosive; Do not heat methanol with open flames.
What materials are needed for Production de Biodiesel à partir d'Huile Végétale?
The main materials required are: Vegetable oil, Methanol, Sodium hydroxide (NaOH), Distilled water.
What results should I expect from Production de Biodiesel à partir d'Huile Végétale?
Two distinct layers: biodiesel (clear, amber upper layer) and glycerol (dark, viscous lower layer). The biodiesel should be less viscous than the original oil. Typical yield is 85-95% by volume.