METHOD OF OBTAINING ETHYL TERT-BUTYL ETHER Russian patent published in 2008 - IPC C07C43/04 C07C41/06 

FIELD: chemistry; obtaining of ethyl tert-butyl ether.

SUBSTANCE: ethyl tert-butyl ether is a high-octane component of engine fuel, made from hydrocarbon raw materials, containing isobutylene, and ethanol, containing more than 1% mass of water, including a column of heteroazeotrope fractional drying of ethanol using the obtained ethyl tert-butyl ether as the selective heteroazeotrope agent with output of dry ethanol, directed for obtaining ethyl tert-butyl ether in the lower heteroazeotrope distillation column and a mixture of ether, water and ethanol in the upper heteroazeotrope distillation column, with subsequent condensation of this mixture and splitting into two layers, with return of the upper layer into the heteroazeotrope distillation column and directing the water layer for separation of ethanol through distillation. The mixture of ether, water and ethanol is output from the upper heteroazeotrope distillation column in a quantity, determined from the formula G₁=G₂·X_e ²·n, where G₁ is the quantity of the mixture of ether, water and ethanol, from the upper heteroazeotrope distillation column, in kg/hour, G₂ is the quantity of ethanol, taken for drying in kg/hour, X_e is the concentration of water in ethanol, taken for drying in % mass and n is a coefficient, assuming values from 0.1 to 0.2. After condensation, of the mixture directed for splitting is cooled down to 10-40°C.

EFFECT: increased selectivity of the process.

5 cl, 5 ex