Process for the manufacture of polybutenes

Claim 1

IN A PROCESS FOR PRODUCING BUTENE POLYMERS OF HIGH VISCOSITY BY CONTACTING IN LIQUID PHASE A BUTENE-CONTAINING HYDROCARBON FEED WITH ALUMINUM CHLORIDE IN A REACTION ZONE, PASSING THE EFFLUENT FROM THE REACTION ZONE COMPRISING BUTENE POLYMERS, UNREACTED HYDROCARBONS, AND ALUMINUM-CONTAINING TARS INTO A SETTLING ZONE TO SEPARATE A HYDROCARBON PHASE AND AN ALUMINUM CHLORIDE TAR PHASE, AND DISTILLING THE HYDROCARBON PHASE TO SEPARATE UNREACTED HYDROCARBONS OVERHEAD AND BUTENE POLYMERS AS A BOTTOMS PRODUCT, THE METHOD OF PRODUCING A BUTENE BOTTOMS PRODUCT HAVING A NARROW RANGE OF POLYMER MOLECULAR WEIGHTS WHICH COMPRISES INTRODUCING INTO EFFLUENT FROM THE REACTION ZONE PRIOR TO COMPLETION OF THE SEPARATION OF THE ALIMINUM CHLORIDE TAR PHASE FROM THE EFFLUENT AN ALKYL PRIMARY AMINE HAVING 1 TO 4 CARBON ATOMS IN AN AMOUNT OF 40 TO 400 PARTS BY VOLUME PER MILLION PARTS BY VOLUME OF THE EFFLUENT.