Solid component of catalyst for the (co)polymerization of ethylene
First Claim
1. A proccess for the preparation of a solid component of a catalyst for the polymerization of ethylene and the copolymerization of ethylene with alfa-olefins, composed of 50-90% by wt. of a carrier of silica particles and 50-10% by wt. of a catalytically active part comprising titanium, magnesium, chlorine and alkoxy groups, comprising the following steps:
- (a) a solution of magnesium chloride in ethanol is prepared;
(b) activated silica particles are impregnated with the solution prepared under (a) by suspending the silica particles in the solution;
(c) at least one titanium compound chosen from alkoxides and halogen alkoxides of titanium and a silicon halide are added to the suspension prepared in (b), with an atomic ratio between the magnesium, in the magnesium chloride, and the titanium ranging from 2.0/1 to 12.1/1 and the ratio between the silicon atoms and alkoxy groups in the alkoxide or halogen alkoxide of titanium ranging from 01./1 to 4.0/1;
(d) the ethanol is eliminated from the suspension obtained in (c) by evaporation to recover a solid;
(e) the solid obtained in (d) is reacted with an alkyl aluminum chloride, with an atomic ratio between the chlorine atoms in the alkyl aluminum chloride and the alkoxy groups in the alkoxide or halogen alkoxide of titanium, ranging from 0.5/1 to 7.0/1; and
(f) the solid component of the catalyst is recovered.
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Abstract
A solid component of a catalyst for the (co)polymerization of ethylene is composed of a silica carrier and a catalytically active part which includes titanium, magnesium, chlorine and also alkoxy groups, and is obtained: by suspending an activated silica in an ethanolic solution of magnesium chloride; by contact of the suspension with an alkoxy or halogen alkoxyde of titanium and with a silicon halide; by eliminating the ethanol from the resulting suspension in order to recover a solid matter; and by making this solid react with an aluminum alkyl chloride.
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Citations
23 Claims
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1. A proccess for the preparation of a solid component of a catalyst for the polymerization of ethylene and the copolymerization of ethylene with alfa-olefins, composed of 50-90% by wt. of a carrier of silica particles and 50-10% by wt. of a catalytically active part comprising titanium, magnesium, chlorine and alkoxy groups, comprising the following steps:
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(a) a solution of magnesium chloride in ethanol is prepared; (b) activated silica particles are impregnated with the solution prepared under (a) by suspending the silica particles in the solution; (c) at least one titanium compound chosen from alkoxides and halogen alkoxides of titanium and a silicon halide are added to the suspension prepared in (b), with an atomic ratio between the magnesium, in the magnesium chloride, and the titanium ranging from 2.0/1 to 12.1/1 and the ratio between the silicon atoms and alkoxy groups in the alkoxide or halogen alkoxide of titanium ranging from 01./1 to 4.0/1; (d) the ethanol is eliminated from the suspension obtained in (c) by evaporation to recover a solid; (e) the solid obtained in (d) is reacted with an alkyl aluminum chloride, with an atomic ratio between the chlorine atoms in the alkyl aluminum chloride and the alkoxy groups in the alkoxide or halogen alkoxide of titanium, ranging from 0.5/1 to 7.0/1; and (f) the solid component of the catalyst is recovered. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification