Processes for recovering hydrocarbons from gas streams

Claim 1

THE PROCESS OF RECOVERING HYDROCARBON FRACTIONS FROM A MAIN GAS STREAM INCLUDING, FLOWING A MAIN GAS STREAM IN SERIES FLOW THROUGH A FIRST ADSORPTION ZONE TO REMOVE HEAVIER HYDROCARBON FRACTIONS AND THROUGH A SECOND ADSORPTION ZONE TO REMOVE LIGHTER HYDROCARBON FRACTIONS FROM SAID MAIN GAS STREAM, STOPPING THE FLOW OF THE MAIN GAS STREAM THROUGH BOTH ADSORPTION ZONES AT THE SAME TIME TO DISCONTINUE REMOVAL OF HYDROCARBON FRACTIONS FROM THE MAIN STREAM, ESTABLISHING A REGENERATION GAS CIRCUIT WHICH INCLUDES BOTH OF THE ADSORPTION ZONES, A HEATING ZONE UPSTREAM OF THE ADSORPTION ZONES AND A CONDENSING AND SEPARATING ZONE DOWNSTREAM OF SAID ADSORPTION ZONES, FLOWING, PRIOR TO THE REMOVAL OF ANY ADDITIONAL MAIN STREAM HYDROCARBON FRACTIONS BY EITHER THE FIRST OR SECOND ADSORPTION ZONES, THE HEATED REGENERATION GAS FROM THE HEATING ZONE AND SEPARATING SAID REGENERATION GAS INTO TWO STREAMS WHICH ARE SIMULTANEOUSLY DIRECTED IN PARALLEL FLOW THROUGH THE ADSORPTION ZONES TO EXTRACT THE HYDROCARBON FRACTIONS AND TO REGENERATE SAID ADSORPTION ZONES, AND THEREAFTER CONDUCTING THE REGENERATION GAS THROUGH THE CONDENSING AND SEPARATING ZONE TO CONDENSE AND RECOVER THE HYDROCARBON FRACTIONS.