Purification of monomers

Claim 1

IN A PROCESS IN WHICH A MIXTURE OF A FIRST MONOMER SELECTED FROM THE GROUP CONSISTING OF ALIPHATIC HYDROCARBON CONJUGATED DIENES AND HALOGEN SUBSTITUTED CONJUGATED DIENES AND A SECOND MONOMER COPOLYMERIZABLE THEREWITH CONTAINING AN ACTIVE CH2=C< AND SELECTED FROM THE GROUP CONSISTING OF ARYL OLEFINS, ACRYLIC ACID, HYDROCARBON SUBSTITUTED ACRYLIC ACIDS, AND HALOGEN SUBSITUTED ACRYLIC ACIDS IS POLYMERIZED IN AN EMULSION POYMERIZATION ZONE AND A LATEX CONTAINING UNREATED FIRST MONOMER AND SECOND MONOMER IS RECOVERED FROM SAID POLYMERIZATION ZONE, SAID SECOND MONOMER HAVING A NORMAL BOILING POINT AT LEAST 50*F. HIGHER THAN THE NORMAL BOILING POINT OF SAID FIRST MONOMER AND SAID FIRST MONOMER BEING SOLUBLE IN SAID SECOND MONOMER; THE IMPROVEMENT WHICH COMPRISES INTRODICUNG SAID LATEX INTO A FLASH ZONE MAINTAINED AT SUB-ATMOPSHERIC PRESSURE, RECOVERING FROM SAID FLASH ZONE A VAPOROUS STREAM CONTAINING FIRST MONOMER AND A FIXED GAS IMPURITY, AT LEAST PARTIALLY CONDENSING SAID VAPOROUS STREAM, INTRODUCING THE THUS AT LEAST PARTIALLY CONDENSED STREAM INTO A MIXING ZONE, PASSING A VAPOROUS STREAM CONTAINING FIRST MONOMER AND FIXED GAS IMPURITY OVERHEAD FROM SAID MIXING ZONE INTO AN ABSORPTION ZONE, INTRODUCING INTO SAID ABSORPTION ZONE AN AMOUNT OF SAID SECOND MONOMER SUFFICIENT TO SELECTIVELY ABSORB SUBSTANTIALLY ALL OF THE FIRST MONOMER FROM SAID VAPORUS STREAM PASSING THROUGH SAID ABSORPTION ZONE, REMOVING UNABSORBED GASES OVERHEAD FROM SAID ABSORPTION ZONE, AND FLOWING THE RESULTING STREAM OF SECOND MONOMER ENRICHED WITH ABSORBED FIRST MONOMER INTO SAID MIXING ZONE.