Solvent recovery

Claim 1

THE PROCESS FOR THE POLYMERIZATION OF AN OLEFIN WHICH COMPRISES CONTACTING AN ALIPHATIC OLEFIN, A SOLID CATALYST FOR POLYMERIZING SAID OLEFIN INTO A NORMALLY SOLID POLYMER AND A SOLVENT AT A PRESSURE SUFFICIENT TO MAINTAIN SAID SOLVENT IN LIQUID STATE, THEREBY TO FORM A SLURRY OF SAID CATALYST IN SAID SOLVENT HAVING A POLYMER OF SAID OLEFIN DISSOLVED THEREIN, SEPARATING SAID SLURRY INTO A LIQUID STREAM SUBSTANTIALLY FREE FROM CATALYST AND COMPRISING A SOLUTION OF POLYMER IN SOLVENT AND A SOLIDS STREAM COMPRISING WASTE CATALYST ASSOCIATED WITH SAID SOLUTION, DISCHARGING SAID SOLIDS STREAM INTO A MOVING BODY OF WATER UNDER CONDITIONS OF TEMPERATURE AND PRESSURE THAT MAINTAIN THE SOLVENT IN LIQUID PHASE AND PRECIPITATING THE POLYMER DISSOLVED IN THE ASSOCIATED SOLUTION TO FORM A MIXTURE OF WASTE CATALYST AND POLYMER SOLIDS SLURRIED IN WATER AND LIQUID SOLVENT, AND THEN DISTILLING OFF THE SOLVENT FROM SAID MIXTURE, SAID PRECIPITATION BEING EFFECTED PRIOR TO SAID DISTILLATION, SAID MOVING BODY OF WATER BEING COOLER THAN SAID SOLIDS STREAM, SAID PRECIPITATION BEING EFFECTED IN A ZONE MAINTAINED UNDER A PRESSURE SUFFICIENT TO PREVENT VOLATILIZATION OF SAID SOLVENT, AND SAID DISTILLATION BEING EFFECTED IN ANOTHER ZONE MAINTAINED UNDER A LOWER PRESSURE THAN THE FIRST-NAMED ZONE.