Pressure-swing Azeaotropic Dstillation
it is used for separation of homogeneous azeotropic mixtures in a mass- and heat- integrated column system.
Published on: Mar 4, 2016
Transcripts - Pressure-swing Azeaotropic Dstillation
An advanced method of distillation in chemical
Azeotropic distillation is carried with the addition of
the entrainer in the solution. Entrainer addition leads
to the formation of the ternary azeotrope in the
solution which facilitates the distillation of the
compound. Entrainer works by affecting the volatility
of one of the components of the solution.
The best known example of entrainer is benzene and
cyclohexane added to water/ethanol azeotropic
mixture in order to form a azeotrope that will facilities
the distillation process.
The most common example of this type of distillation column is the
separation of ethanol.
The distillation of ethanol takes place with the concentration of eth
ethanol and water solution to 90% concentrated solution of ethanol
The entrainer, n-pentane is added to the feed column to form a ternary
azeotrope in the column which enhances the separation of the ethanol
from the solution. The formation of ternary azeotrope forms a two
phase in the solution.
The two separate phase present in the solution comprises of an organic
phase which remains at the top of the column and the lower heavy
phase which is expelled out of the column as crude ethanol.
The entire process is carried at a temperature of 32°C and pressure of 1
Azeotriopic distillation is commonly employed in
three different forms
Matrial Separating Agent : Agent used in the
distillation process is entrainer.
Pressure-swing distillation: It is based on the varying
pressure and activity coefficient of the solvent.
Molecular sieves: It is commonly used to remove water
form eth given sample.