Treating recycle gas

Claim 1

AN IMPROVED CONTINUOUS PROCESS FOR PREPARING BUTYL RUBBER WHICH COMPRISES POLYMERIZING A MIXTURE OF A MAJOR AMOUNT OF C4 TO C7 ISOOLEFIN AND A MINOR AMOUNT C4 TO C10 CONJUGATED DIOLEFIN, AND POLYMERIZATION BEING CARRIED OUT IN THE PRESENCE OF A FRIEDEL-CRAFTS CATALYST AT TEMPERATURES BETWEEN ABOUT -130*C. AND -60*C. IN A METHYL CHLORIDE DILUENT SO AS TO FORM A SLURRY OF THE POLYMERIZED PRODUCT IN SAID DILUENT TOGETHER WITH UNREACTED MONOMERS AND OXYGEN-CONTAINING ORGANIC POLYMERIZATION POISONS, ADMIXING SAID SLURRY WITH WATER OF SUFFICIENTLY HIGH TEMPERATURE TO PRODUCE AS VAPORIZED FIRST STREAM COMPRISING WATER, DILUENT, UNREACTED MONOMERS AND OXYGEN-CONTAINING ORGANIC POLYMERIZATION POISONS, TRANSPORTING SAID FIRST STREAM THROUGH A SERIES OF COOLING, KNOCKOUT AND COMPRESSING ZONES SO AS TO REMOVE GROSS AMOUNT OF WATER CONTENT THEREFROM, INTIMATELY CONTACTING THE RESULTANT FIRST STREAM IN AN ABSORPTION ZONE WITH A SOLUTION OF AN ALKYLENE GLYCOL HAVING FROM 2 TO 6 CARBON ATOMS, WITHDRAWING FROM SAID ABSORPTION ZONE A SECOND RAFFINATE STREAM CONTAINING LESS WATER AND POLYMERIZATION POISONS THAN SAID FIRST STREAM, DRYING SAID SECOND STREAM IN THE PRESENCE OF ALUMINA, AND FRACTIONATING SAID DRY STREAM TO FORM A RECYCLE STREAM FROM THE POLYMERIZATION REACTION.