or

ask mattrab Visit www.askmattrab.com for more academic resources.

Lab Preparation of Ethoxyethane

Principle
When excess ethyl alcohol (ethanol) is heated with conc. H2SO4 at 1400C, diethyl ether or ethoxyethane is obtained.

CH3CH2OH + conc.H2SO CH3CH2HSO4 + H2O
CH3CH2HSO4 + CH3CH2OH  CH3CH2-O-CH2CH3

Figure

Procedure
50 cc of conc. H2SO4 is gradually added with constant shaking to 100 cc of ethyl alcohol kept in the distillation flask. The mixture is heated on the water bath at 1400C. When ether begins to distill over, alcohol is added in the distillation flask from the dropping funnel at nearly the same rate as that of the distillation, the temperature being maintained at 1400C.

Purification
The distillate contains ether, ethyl alcohol, water, and sulphur dioxide. It is first washed with dil. NaOH solution and then with water. The upper layer is separated and dried over anhydrous CaCl2. It is then redistilled on a water bath pure ether passes over at 34-350C.