Этерификация по Фишеру с получением этилацетата

Синтез сложного эфира с фруктовым ароматом

Organic Synthesis Advanced (University) 90 мин ~$20,00

Цель

Синтезировать этилацетат (аромат жидкости для снятия лака) реакцией Фишера между уксусной кислотой и этанолом в присутствии серной кислоты.

Предпосылки

Fischer esterification is the acid-catalyzed condensation of a carboxylic acid with an alcohol to form an ester and water. The reaction is reversible, and excess alcohol is used to drive the equilibrium toward product formation. Ethyl acetate has a characteristic sweet, fruity smell and is widely used as an industrial solvent.

Предупреждения по безопасности

  • Concentrated sulfuric acid is extremely corrosive
  • Glacial acetic acid causes burns
  • Ethanol and ethyl acetate are flammable — no open flames
  • Work in a fume hood
  • Add sulfuric acid slowly to the mixture

Требуемые СИЗ

goggles gloves lab_coat

Материалы

  • Glacial acetic acid (10 mL)
    Corrosive
  • Ethanol (absolute) (15 mL)
    Excess to drive equilibrium
  • Sulfuric acid (H₂SO₄) (2 mL)
    Concentrated, catalyst
  • Sodium bicarbonate solution (50 mL)
    5% for washing
  • Anhydrous sodium sulfate (5 g)
    Drying agent

Оборудование

Round-bottom flask (100 mL) Reflux condenser Heating mantle Separating funnel Boiling chips Thermometer

Процедура

1

Add 15 mL ethanol and 10 mL glacial acetic acid to the round-bottom flask with boiling chips.

3 мин Handle acetic acid in fume hood
2

Slowly add 2 mL concentrated H₂SO₄ as catalyst. Swirl gently to mix.

3 мин Add acid slowly — exothermic
3

Attach the reflux condenser and heat gently at reflux for 45 minutes.

45 мин Ensure water is flowing through condenser
4

Cool the flask. Pour the contents into a separating funnel with 30 mL water.

5 мин
5

Wash the organic layer with 25 mL of 5% NaHCO₃ to remove excess acid. Vent the funnel frequently.

5 мин CO₂ gas released — vent carefully
6

Separate the organic layer (top) and dry over anhydrous Na₂SO₄ for 10 minutes.

12 мин
7

Filter off the drying agent. Carefully smell the product by wafting — note the fruity aroma of ethyl acetate.

3 мин Never sniff directly — waft vapors toward nose
8

Calculate the yield based on the volume collected and the theoretical yield.

5 мин

Ожидаемые результаты

A clear, colorless liquid with a sweet, fruity smell characteristic of ethyl acetate. Typical yield is 60-70% due to the equilibrium nature of the reaction.

Уборка

Dispose of organic waste in the designated container. Neutralize acid waste before disposal. Rinse all glassware with acetone then water.

Frequently Asked Questions

What is the objective of Этерификация по Фишеру с получением этилацетата?
Синтезировать этилацетат (аромат жидкости для снятия лака) реакцией Фишера между уксусной кислотой и этанолом в присутствии серной кислоты.
How difficult is Этерификация по Фишеру с получением этилацетата?
This experiment is rated as Advanced (University). It takes approximately 90 minutes to complete.
What safety precautions are needed for Этерификация по Фишеру с получением этилацетата?
Key safety precautions include: Concentrated sulfuric acid is extremely corrosive; Glacial acetic acid causes burns; Ethanol and ethyl acetate are flammable — no open flames.
What materials are needed for Этерификация по Фишеру с получением этилацетата?
The main materials required are: Glacial acetic acid, Ethanol (absolute), Sulfuric acid (H₂SO₄), Sodium bicarbonate solution, Anhydrous sodium sulfate.
What results should I expect from Этерификация по Фишеру с получением этилацетата?
A clear, colorless liquid with a sweet, fruity smell characteristic of ethyl acetate. Typical yield is 60-70% due to the equilibrium nature of the reaction.