| 摘要 |
A process for continuously polymerizing ethylene comprises continuously feeding ethylene, and a catalyst composition comprising a hydrocarbon-soluble aluminium trihalide, a hydrocarbon-soluble or halogen-substituted-hydrocarbon-soluble organo-metallic compound of a metal of Group IIb, IVa or Va of the Deming Periodic Table and a trace amount of a hydrocarbon-soluble or halogen-substituted hydrocarbon-soluble vanadium compound or a vanadium compound which can become hydrocarbonsoluble or halogen-substituted hydrocarbonsoluble by reaction with the other catalyst components, to an inert solvent to form a reaction mixture, continuously removing a portion of the reaction mixture, mechanically separating solids from the removed portion in an inert atmosphere and recycling the liquid phase of the removed portion, without purification thereof, to the reaction mixture through a mass of the organometallic compound in the solid state, whereby a sufficient molar concentration of the organo-metallic compound, which is significantly greater than the molar concentration of the aluminium halide and the vanadium compound, is maintained in the reaction mixture to promote the ethylene polymerization. The aluminium trihalide may be aluminium tribromide or trichloride. Specified organo-metallic compounds are dimethyl zinc, di-n-butyl zinc, di-o-tolyl zinc, dibutyl cadmium, diisoamyl cadmium, diphenyl mercury, dibenzyl mercury, diisoamyl mercury, di-n-hexyl mercury, ditolyl mercury, amyl triphenyl germane, hexabenzyl digermane, hexaphenyl digermane, tetraisoamyl germane, diethyldiisobutyl tin, diethyldiphenyl tin, dimethyldiethyl tin and triphenyl tin bromide. Specified vanadium compounds are vanadium oxytrichloride, tribromide, pentafluoride, tetrachloride, dichloride, dibromide, pentoxide and oxydichloride. The solvent may be cyclohexane. Examples describe the polymerization of ethylene in the presence of catalysts comprising tin tetraphenyl, aluminium trichloride and vanadium tetrachloride. Specification 873,498 is referred to. |
