the pressure of 30 ata is maintained the absorbent flowrate is 1900 m 3 hour the purified gas which contains 0 1 vol of co 2 is extracted from the absorber top the saturated solvent which contains carbon dioxide is extracted at 3 u00b0 c from the absorber bottom and is delivered into the 1st stage expander where the pressure of 6 ata is maintained as a result of desorption of a part of dissolved gases from the solution on decreasing the pressure the temperature of the saturated solvent drops and attains 2 u00b0 c the gas released in the 1st stage expander 2800 nm 3 hour and containing the most absorbed hydrogen and nitrogen h 2 25 0 n 2 22 0 co 2 53 0 vol is delivered to the compressor suction and returns into the absorber the solvent enters then the 2nd stage expander where the pressure of 1 5 ata is maintained here the desorption of the main quantity of absorbed carbon dioxide takes place the composition of the outgoing fraction vol is co 2 98 8 h 2 0 5 n 2 0 7 the quantity is 25 000 nm 3 hour on desorption the solvent is cooled down to 1 u00b0 c and enters the desorber where the pressure of 1 2 ata is maintained into the desorber bottom 13 000 nm 3 of air is delivered at the ambient temperature.