Method for producing polymers of ethylene

Abstract

Abstract A PROCESS FOR THE PREPARATION OF ETHYLENE POLYMERS WHICH COMPRISES CONTACTING AT TEMPERATURES BETWEEN 50* AND 80*C. AND A PRESSURE RANGING FROM BELOW ATMOSPHERIC PRESSURE UP TO FIVE ATMOSPHERES, GASEOUS ETHYLENE WITH A CATALYTIC SOLUTION OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF A SATURATED ALIPHATIC HYDROCARBON SOLVENT, A CYCLO-ALIPHATIC HYDROCARBON SOLVENT, AND AN AROMATIC HYDROCARBON SOLVENT, AND A THREE-COMPONENT SYSTEM SELECTED FROM THE GROUP CONSISTING OF: (A) A MEMBER SELECTED FROM THE GROUP CONSISTING OF VANADIUM OXYCHLORIDE AND VANADIUM OXYACETYL ACETONATE; (B) TITANIUM TETRACHLORIDE; AND (C) A MEMBER SELECTED FROMTHE GROUP CONSISTING OF AN ALUMINUM DIALKYLCHLORIDE OF THE FORMULA AIR2CL, AN ALUMINUM ALKYL DICHLORIDE OF THE FORMULA AIRCL2, AND AN ALKYL ALUMINUM SESQUINCHLORIDE OF THE FORMULA AL2R3CL3; WHEREIN R REPRESENTS AN ALKYL RADICAL HAVING FROM 1 TO 10 CARBON ATOMS, SAID ATOMIC RATIO BETWEEN SAID VANADIUM AND SAID TITANIUM RANGING BETWEEN 0.075 AND 0.3, SAID ATOMIC RATIO BETWEEN SAID ALUMINUM AND SAID VANADIUM RANGING BETWEEN 4 AND 15, AND SAID CATALYTIC SOLUTIONS BEING PREPARED BY: (1) CONTACTING IN SAID HYDROCARBON SOLVENT, CATALYSTS (A) AND (B) WITH 20-80% BY WEIGHT OF THE OVERALL THREE-COMPONENT CATALYTIC SYSTEM OF CATALYST (C), AT A TEMPERATURE OF FROM-20*+20*C., (2) RIPENING SAID SOLUTION DURING A PERIOD OF FROM 1-25 HOURS AND AT A TEMPERATURE OF FROM-20* TO +20*C., AND (3) ADDING, AFTER THE REPINING PERIOD, THE REMAINING QUANTITY OF CATALYST (C) AT A TEMPERATURE OF FROM 50-120*C.

Inventors

• 👤 Benedetto Calcagno
• 👤 Paolo Colombo
• 👤 Giovanni Livraghi

Bibliographic Details