Process for the concentration and purification of acetylene in gases formed in the pyrolysis of hydrocarbons

Claim 1

THE PROCESS FOR THE SEPARATION AND PURIFICATION OF ACETYLENE FROM A MIXTURE OF GASES CONTAINING ACETYLENE HOMOLOGUES AND POLYMERS THEREOF, AND CONDENSABLE GASES AND NON-CONDENSABLE GASES CONTAINING CARBON DIOXIDE, AND OBTAINED BY PYROLYSIS OF HYDROCARBONS, WHICH COMPRISES THE FIRST STEP OF CONTACTING SAID PYROLYSIS GAS MIXTURE WITH AN AQUEOUS AMMONIA SOLUTION, OBTAINED DURING THE FOURTH STEP WHEREBY SAID PYROLYSIS GAS MIXTURE IS DECARBONATED BY REMOVAL OF CO2 TAKEN UP BY SAID AQUEOUS AMMONIA SOLUTION; THE SECOND STEP OF SUBJECTING SAID DECARBONATED GAS MIXTURE TO INDIRECT HEAT EXCHANGE WITH RESIDUAL GASES FROM THE THIRD STEP TO REMOVE CONDESABLE GASES BY CONDENSATION; THE THIRD STEP OF SCRUBBING THE REMAINING GAS MIXTURE OF ACETYLENE GASES AND NON-CONDENSABLE GASES WITH LIQUID AMMONIA TO DISSOLVE THE ACETYLENIC GASES AND TO LEAVE A RESIDUE OF COOLED UNDISSOLVED NON-CONDESABLE GASES, AND EFFECTING SAID INDIRECT HEAT EXCHANGE COOLING OF THE SAID DECARBONATED GAS MIXTURE IN THE SECOND STEP WITH SAID RESIDUE; THE FOURTH STEP OF CONTACTING SAID RESIDUE OF COOLED NON-CONDENSABLE GASES WITH WATER FOR RECOVERY OF AMMONIA ENTRAINED IN SAID SCRUBBING STEP TO FORM AN AQUEOUS AMMONIA SOLUTION, AND RECYCLING SAID