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US 10,077,322 B2Granted
Process for the polymerization of ethylene
AssigneeBasell Poliolefine Italia S.r.l.
InventorsPietro Baita, Tiziano Dall'Occo, Maria Di Diego, Dario Liguori, Lorella Marturano, Andreas Maus, Gabriele Mei, Gerhardus Meier, Giampiero Morini, Roberta Pica, Ulf Schueller
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Abstract
The present disclosure provides a gas-phase polymerization process for preparing polyethylene, wherein halogenated alcohols in combination with a Ti based catalyst component and aluminum alkyls as co-catalyst suppress ethane formation or increase polymerization activity.
Claims13
A method for reducing ethane generation in the preparation of an ethylene (co)polymer comprising:
- polymerizing a gaseous mixture comprising;
- (a) ethylene,
- (b) hydrogen,
- (c) an inert fluidizing gas, and
- (d) optionally one or more alpha olefins CH2═CHR where R is a C1-C10 hydrocarbon group,
- in the presence of
- (i) a catalyst system comprising
- (A) a pre-polymerized solid catalyst component comprising a titanium (Ti) compound supported on magnesium dichloride further comprising an internal donor (ID) selected from the group consisting of ethers, esters, amines and ketones, and
- (B) an aluminum alkyl compound, and
- (C) a halogenated alcohol of the general formula AOH,
- where A is a C1-C10 saturated or unsaturated hydrocarbon group wherein at least one of the hydrogen atoms is replaced by chlorine,
- wherein the molar ratio of AOH to Ti is about 0.5 to about 8.
9 more elements
Dependencies are inferred from the claim text.