HOW CAN WE OBTAIN DIFFERENT GASES FROM AIR ?
Air is a homogeneous mixture and can be separated into its components by fractional distillation. The flow diagram (Fig. 2.11) shows the steps of the process.
Step 1:
The air is first compressed and cooled by increasing pressure and decreasing temperature.
Due to this the air which is in the gaseous form is transformed to liquid form as liquid air.Step 2:
The transformed liquid air is then allowed to warm up slowly in fractional distillation column.
where gases get separated at different heights depending upon their boiling points as shown below.
