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US 2019/0375862 A1Published application
Off-line filter free ziegler-natta catalyst preparation
AssigneeNOVA Chemicals (International) S.A.
InventorsQinyan Wang, Holly Kalma, Marissa Clapson, Peter Zoricak, Lawrence VanAsseldonk, Stephen Brown
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Abstract
The various embodiments provide, a magnesium titanium polymerization procatalyst, and methods for making and using the same.
Claims15
A process to prepare an olefin polymerization procatalyst comprising a Ti3+ complex, said process comprising:
- a) forming a delta form MgCl2 species by combining
- i) a Mg compound chosen from butylethyl magnesium (BEM), dibutyl magnesium, and butyloctyl magnesium (BOM), a solvent chosen from C5-12 alkanes, or mixtures thereof,
- ii) reactive organic chloride or HCl;
- and wherein the mole ratio of added Cl and Mg is from 2.1 to 2.3;
- b) adding to said delta form MgCl2 species prepared in step a), an aluminum alkyl halide of the formula R1xAlX3−x first, a tetravalent titanium compound second, followed by an alkyl aluminum alkoxide of the formula R4yAlOR53−y, wherein the Al/Ti molar ratio when measuring Al supplied from R1xAlX3−x only is from about 0.7 to about 1 and the Al/Ti molar ratio when measuring Al supplied from R4yAlOR53−y is from about 1 to about 2;
- and further wherein
- the Mg/Ti molar ratio is from about 5 to about 10;
- x is 1 or 2;
- y is 1 or 2;
- each R1 is independently chosen from C1-8 alkyl radicals;
- the tetravalent titanium compound is chosen from TiR2X3, Ti(OR3)X3, TiX4, and mixtures thereof;
- each X is independently chosen from the halogen radicals;
- each R2 is independently chosen from C1-8 alkyl radicals and benzyl;
- and
- each R3, R4 and R5 are independently chosen from C1- 8 alkyl radicals wherein no filtration or washing steps are performed during or after the formation of the catalyst.
12 more elements
A solution olefin polymerization process comprising
- i) adding to one or more continuous stirred tank reactor (CSTR), optionally followed by a tubular reactor, either in series or parallel, a solvent chosen from C5-12 alkanes, or mixtures thereof, and a procatalyst for polymerization on a delta form MgCl2 support comprising a Ti3+ complex of the formula TiCl3*[[R4]a[R5O]bAlX3−c]d wherein
- a is 0 to 1;
- b is 0 to 1;
- c=a+b;
- d is from 0.33 to 1.0;
- each R4 and R5 is independently chosen from C1-8 alkyl radicals;
- each X is independently chosen from the halogen radicals;
- wherein at least 60% of the total Ti present is in the Ti3+ oxidation state;
- and further wherein no filtration or washing step is performed on the as formed procatalyst prior to the remaining steps;
- ii) adding ethylene, hydrogen and optionally one or more comonomers chosen from C3-8 comonomers to the reactor;
- and
- iii) adding an aluminum alkyl activator to the reactor in a molar ratio of about 1 to about 10, relative to the amount of procatalyst.
9 more elements
Dependencies are inferred from the claim text.