Process for dry polymerization of olefins

Claim 1

A PROCESS OF PRODUCING POLYMERS HAVING A MOLECULAR WEIGHT GENERALLY ABOVE 50,000, BY POLYMERIZATION OF OLEFINS HAVING THE GENERAL FORMULA CH2=CHR IN WHICH R IS SELECTED FROM THE GROUP CONSISTING OF A HYDROGEN ATOM AND AN ALKYL RADICAL HAVING UP TO 8 CARBON ATOMS, IN THE PRESENCE OF A PREPOLYMER CONTAINING A CATALYST FORMED OF A CATALYTICALLY ACTIVE SOLID COMPOUND OF A TRANSITION METAL OF SUB-GROUPS IVA, VA OR VIA OF THE PERIODIC TABLE OF ELEMENTS, AND AT LEAST ONE CO-CATALYST FORMED OF AN ORGANO-METALLIC COMPOUND OF A METAL OF GROUPS II OR III OF THE PERIODIC TABLE IN WHICH THE PREPOLYMER IS PREPARED BY POLYMERIZATION OF ONE OR MORE OLEFINS IN AN INET LIQUID AND A SOLID COMPOUND OF A TRANSITION METAL OF SUB-GROUPS IVA, VA AND VIA OF THE PERIODIC TABLE OF ELEMENTS AND A CO-CATALYST, COMPRISING PRESEVERING THE CATALYST CONTAINING PREPOLYMER SOLID IN A HYDROGEN ATMOSPHERE, SEPARATELY INTRODUCING INTO A REACTION VESSEL THE OLEFIN OR OLEFINS TO BE POLYMERIZED AND THE CATALYST CONTAINING PREPOLYMER SOLID; CIRCULATING UPWARDLY IN THE REACTION VESSEL CONTAINING POLYMER IN THE COURSE OF BEINF FORMED, A STREAM OF A GASEOUS MIXTURE CONTAINING THE OLEFIN OR THE OLEFINS TO BE POLYMERIZED, AND HYDROGEN, IN WHICH THE POLYMER IN THE REACTION VESSEL IS FLUIDIZED BY THE ASEOUS MIXTURE CONTAINING HYDROGEN AND THE OLEFIN OR OLEFINS TO BE POLYMERIZED, RECYCLING TO THE REACTION VESSEL THE GASES ISSUING THEREFROM; AND REMOVING AT LEAST A PART OF THE POLYMER CONTAINED IN THE REACTION VESSEL.