There are several solutions that can be applied to overcome this azeotropic problem.
One of them is:
1) Pressure-swing: Some of the azeotropes change their composition when operating pressure is changed. For example the azeotropic composition of an ethanol-water mixture at 1 bar is different compared to that of the same mixture at 8 bar.
The first column is operated at 1 bar. The column is able to separate pure A1 and azeotropic composition B1 as a top product. The distillate is then fed into the second column which is operated at a higher pressure, 8 bar. It is able to separate pure A2 and the second azeotropic composition B2. From this diagram we can clearly see that by changing the pressure the azeotropic composition shifts to the right.
This method of overcoming azeotropic composition is known as 'pressure-swing distillation'. It is however only applicable to those azeotropes that change their composition with pressure.
One of them is:
1) Pressure-swing: Some of the azeotropes change their composition when operating pressure is changed. For example the azeotropic composition of an ethanol-water mixture at 1 bar is different compared to that of the same mixture at 8 bar.
The first column is operated at 1 bar. The column is able to separate pure A1 and azeotropic composition B1 as a top product. The distillate is then fed into the second column which is operated at a higher pressure, 8 bar. It is able to separate pure A2 and the second azeotropic composition B2. From this diagram we can clearly see that by changing the pressure the azeotropic composition shifts to the right.
This method of overcoming azeotropic composition is known as 'pressure-swing distillation'. It is however only applicable to those azeotropes that change their composition with pressure.
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