Produção de Biodiesel a partir de Óleo Vegetal

Conversão de óleo de cozinha em biodiesel por transesterificação

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

Objetivo

Converter óleo vegetal em biodiesel (ésteres metílicos de ácidos graxos) por transesterificação catalisada por base com metanol.

Contexto

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.

Avisos de segurança

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

EPI necessário

goggles gloves lab_coat

Materiais

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

Equipamentos

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

Procedimento

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

Resultados esperados

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.

Limpeza

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.

Detalhes

Categoria
Organic Synthesis
Dificuldade
Intermediate (High School)
Duração
60 min
Custo estimado
$12,00
Passos
8
Materiais
4

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Frequently Asked Questions

What is the objective of Produção de Biodiesel a partir de Óleo Vegetal?
Converter óleo vegetal em biodiesel (ésteres metílicos de ácidos graxos) por transesterificação catalisada por base com metanol.
How difficult is Produção de Biodiesel a partir de Óleo Vegetal?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for Produção de Biodiesel a partir de Óleo Vegetal?
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 Produção de Biodiesel a partir de Óleo Vegetal?
The main materials required are: Vegetable oil, Methanol, Sodium hydroxide (NaOH), Distilled water.
What results should I expect from Produção de Biodiesel a partir de Óleo Vegetal?
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.