Sản Xuất Biodiesel Từ Dầu Thực Vật
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Chuyển đổi dầu ăn thành biodiesel qua este chuyển hóa
Mục tiêu
Chuyển đổi dầu thực vật thành biodiesel (este metyl của axit béo) bằng este chuyển hóa xúc tác bazơ với metanol.
Bối cảnh
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.
Cảnh báo an toàn
- Methanol is toxic and flammable — work in fume hood
- NaOH is corrosive
- Do not heat methanol with open flames
- Adequate ventilation is essential
PPE cần thiết
Vật liệu
-
Vegetable oil (100 mL)Clean cooking oil
-
Methanol (20 mL)Anhydrous
-
Sodium hydroxide (NaOH) (1 g)Catalyst
-
Distilled water (100 mL)For washing
Thiết bị
Quy trình
Dissolve 1 g NaOH in 20 mL methanol to create sodium methoxide. Stir until fully dissolved.
Heat 100 mL of vegetable oil to 55°C in the Erlenmeyer flask on the hot plate.
Add the sodium methoxide/methanol solution to the warm oil. Stir vigorously.
Maintain temperature at 55-60°C and stir continuously for 30 minutes.
Transfer the mixture to a separating funnel and allow to settle for 15 minutes. Two layers should form.
Drain the lower glycerol layer (dark, viscous). The upper layer is crude biodiesel.
Wash the biodiesel layer gently with 50 mL warm distilled water. Allow to separate and drain the water.
Record the volume of biodiesel produced and calculate the conversion rate.
Kết quả dự kiến
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.
Dọn dẹp
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.
Chi tiết
- Danh mục
- Organic Synthesis
- Độ khó
- Intermediate (High School)
- Thời gian
- 60 phút
- Chi phí ước tính
- $12,00
- Số bước
- 8
- Vật liệu
- 4