Purified catalyst support
AssigneeStauffer Chemical Company
InventorCarl C. Greco
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Abstract
This invention relates to pretreating the support material for a polymerization catalyst comprising magnesium chloride with an active hydrogen compound such as an organic acid phosphate or a phenol in order to transform substantially elemental magnesium and other impurities. The impure magnesium chloride originates as a by-product from the manufacture of magnesium alkyls by the reaction of alkyl chlorides with elemental magnesium. Succeeding steps are activating the support material with an electron donor and treating the activated product with a titanium halide. The invention also includes the novel catalytic component containing titanium halide, itself, the process for making that component, use of this catalytic system for polymerizing olefins such as propylene, and the purification step for magnesium chloride, itself.
Claims32
A process for refining magnesium halides containing about 5 percent or more magnesium metal which includes the step of treating the magnesium halide with an active hydrogen compound in order to transform substantially the elemental magnesium to the magnesium salt of the active hydrogen compound.
In a process for preparing a catalytic system for polymerizing olefins comprising:
- (a) a component containing titanium halide obtained by:
- (i) activating a support material comprising magnesium chloride with an electron donor to make an activated product, and
- (ii) treating the activated product with a titanium halide to form the titanium halide component, and
- (b) a component containing an organoaluminum compound, the improvement comprising pretreating the support material comprising magnesium chloride containing about 5 percent or more magnesium metal with an active hydrogen compound in order to transform substantially the elemental magnesium to the magnesium salt of the active hydrogen compound.
In a process for preparing a component containing titanium halide for a catalytic system for polymerizing olefins comprising:
- (a) a component containing titanium halide obtained by:
- (i) activating a support material comprising magnesium chloride with an electron donor to make an activated product, and
- (ii) treating the activated product with a titanium halide to form the titanium halide component,
- the improvement comprising pretreating the support material comprising magnesium chloride containing about 5 percent or more magnesium metal with an active hydrogen compound in order to transform substantially the elemental magnesium to the magnesium salt of the active hydrogen compound.
Dependencies are inferred from the claim text.