Производство биодизеля из растительного масла

Превращение кулинарного масла в биодизель путём переэтерификации

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

Цель

Перевести растительное масло в биодизель (метиловые эфиры жирных кислот) основно-катализируемой переэтерификацией с метанолом.

Предпосылки

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.

Предупреждения по безопасности

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

Требуемые СИЗ

goggles gloves lab_coat

Материалы

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

Оборудование

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

Процедура

1

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

5 мин Exothermic — methanol is flammable
2

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

5 мин
3

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

2 мин
4

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

30 мин Keep in fume hood
5

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

15 мин
6

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

3 мин
7

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

5 мин
8

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

3 мин

Ожидаемые результаты

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.

Уборка

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.

Frequently Asked Questions

What is the objective of Производство биодизеля из растительного масла?
Перевести растительное масло в биодизель (метиловые эфиры жирных кислот) основно-катализируемой переэтерификацией с метанолом.
How difficult is Производство биодизеля из растительного масла?
This experiment is rated as Intermediate (High School). It takes approximately 60 minutes to complete.
What safety precautions are needed for Производство биодизеля из растительного масла?
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 Производство биодизеля из растительного масла?
The main materials required are: Vegetable oil, Methanol, Sodium hydroxide (NaOH), Distilled water.
What results should I expect from Производство биодизеля из растительного масла?
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.