Polymerization of olefins in a gravitating bed

Claim 1

A PROCESS FOR POLYMERIZING A GASEOUS 1-OLEFIN TO SOLID POLY-1-OLEFIN, WHICH COMPRISES FEEDING, TO THE TOP OF A GRAVITATING BED OF SOLID POLYOLEFIN, DERIVED FROM SAID 1-OLEFIN AND SOLID POLYMERIZATION CATALYST, SOLID POLYMERIZATION CATALYST, AND SAID GASEOUS 1-OLEFIN; PASSING SAID GASEOUS 1-OLEFIN DOWNWARDLY THROUGH SAID GRAVITATING BED, AT AN INLET TEMPERATURE THAT IS ABOVE ABOUT 100*F. BUT BELOW THE FUSION TEMPERATURE OF SAID POLY-1-OLEFIN, AT A PRESSURE AT LEAST SUFFICIENT TO OVERCOME THE PRESSURE DROP THROUGH SAID GRAVITATING BED AND AT A FLOW RATE SUFFICIENT TO REMOVE EXOTHERMIC HEAT OF POLYMERIZATION; REMOVING UNREACTED GASEOUS 1-OLEFIN AT A POINT NAR THE BOTTOM OF SAID GRAVITATING BED, COOLING THE GASEOUS 1-OLEFIN SO REMOVED TO SAID INLET TEMPERATURE, AND RECYCLING IT; AND REMOVING POLY-1-OLEFIN PRODUCT AND SOLID POLYMERIZATION CATALYST FROM THE BOTTOM OF SAID GRAVITATING BED.