Polymerization of olefins employing granular catalyst

Claim 1

A PROCESS FOR THE POLYMERIZATION OF OLEFINS IN THE PRESENCE OF A GRANULAR POLYMERIZATION CATALYST AT A POLYMERIZATION TEMPERATURE AND PRESSURE WHICH COMPRISES PASSING THE FEED STREAM COMPRISING SAID OLEFINS AT A TEMPERATURE BELOW SAID REACTION TEMPERATURE INTO A REACTION ZONE INCLUDING A BED OF SAID CATALYST, WITHDRAWING AN EFFLUENT STREAM COMPRISING POLYMERIZED OLEFINS FROM SAID BED, RECYCLING A PORTION OF THE TOTAL EFFLUENT STREAM WITHOUT SUBSTANTIAL CHANGE IN TEMPERATURE THROUGH SAID BED IN ADMIXTURE WITH SAID FEED STREAM AND WITHDRAWING THE REMAINDER OF SAID EFFLUENT STREAM FROM SAID REACTION ZONE, THE REACTION TEMPERATURE AND PRESSURE BEING MAINTAINED AT A LEVEL SUCH THAT THE FLUIDS CONTENTS OF SAID ZONE ARE IN A SUBSTANTIALLY NON-GASEOUS PHASE, AND THE FEED STREAM TEMPERATURE BEING SUCH THAT ITS SENSIBLE HEAT UP TO THE REACTION TEMPERATURE WILL SUBSTANTIALLY EQUAL THE HEAT OF REACTION.