Process for the selective separation of components of gaseous mixtures by regenerative cooling

Claim 1

A PROCESS FOR THE SELECTIVE SEPARATION OF AT LEAST TWO HIGH BOILING CONSTITUENTS HAVING DIFFERENT BOILING POINTS FROM GAS MIXTURES CONTAINING THE SAME AND A RESIDUAL GAS BY COOLING BY MEANS OF AT LEAST TWO GROUPS OF REVERSING HEAT EXCHANGERS BEING AT DIFFERENT TEMPERATURES EACH GROUP HAVING SUCH A TEMPERATURE AY ITS COLD END, THAT ONLY ONE HIGH BOILING COMPONENT IS COMPLETELY CONDENSED THEREIN AND THAT BY MEANS OF VALVES AND REVERSING HEAT-EXCHANGERS CYCLICALLY ARE CONNECTED IN SUCH A WAY ONE BEHIND THE OTHER, THAT THE GAS MIXTURE TO BE SEPARATED IS PASSED IN A FIRST PERIOD THROUGH ONE REGENERATOR OF EACH GROUP IN THE DIRECTION FROM HIGHER TEMPERATURE REVERSING HEAT-EXCHANGERS TO LOWER TEMPERATURE REVERSING HEAT-EXCHANGERS FOR CONDENSING THE HIGH BOILING CONSTITUENTS SEPARATELY RELATIVE TO THEIR BOILING POINTS IN SAID REVERSING HEAT-EXCHANGERS FROM THE RESIDUAL GAS; IN A SECOND PERIOD PASSING A SCAVENGING GAS THROUGH A CLEAN HEAT-EXCHANGER OF THE GROUP WHICH IS AT LOWEST TEMPERATURE AND THEN THROUGH A HEAT-EXCHANGER WHICH IS AT HIGHER TEMPERATURE AND IN WHICH HAS BEEN CONDENSED ONE HIGH BOILING CONSTITUENT IN A FOREGOING FIRST PERIOD FOR WITHDRAWING SAID CONDENSED HIGH BOILING CONSTITUENT; IN A THIRD PERIOD PASSING A SCAVENGING GAS THROUGH ONE OF THE REVERSING HEAT-EXCHANGERS OF THE GROUP WHICH IS AT LOWEST TEMPERATURE AND IN WHICH HAS BEEN CONDENSED ANOTHER HIGH BOILING CONSTITUENT IN A FOREGOING FIRST PERIOD; WITHDRAWING SAID FURTHER CONDENSED HIGH BOILING CONSTITUENT AND THEN PASSING IT THROUGH A CLEAN HEAT-EXCHANGER OF THE GROUP OF HEAT-EXCHANGERS WHICH ARE AT HIGHER TEMPERATURE.