Preparation of supported auxiliary catalysts at elevated temperature and pressure in a closed vessel
AssigneeAlbemarle Corporation
InventorsNiomi L. Krzystowczyk, Steven P. Diefenbach, John Y. Lee
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Abstract
A slurry is formed from an auxiliary catalyst (e.g., an aluminoxane or organoboron compound), a porous inorganic oxide carrier, and an inert organic solvent. The slurry is enclosed in a closed vessel and the temperature and pressure of the enclosed slurry are increased to a temperature of from about 80.degree. C. to 250.degree. C. and a pressure of from about 5 to 500 psig such that a supported composition is produced in the vessel. After opening the closed vessel, the supported composition and the solvent are separated from each other.
Claims11
A process for supporting an auxiliary catalyst on a carrier, said process comprising:
- a) forming a slurry consisting of said auxiliary catalyst, a porous inorganic oxide carrier, and an inert organic solvent;
- b) enclosing said slurry in a closed vessel and increasing the temperature and pressure of said slurry while so enclosed to a temperature of from about 80.degree. C. to 250.degree. C. and a superatmospheric pressure of from about 5 to 500 psig such that a supported composition is produced;
- and
- c) opening said closed vessel after said supported composition has been formed therein, and separating said solvent and said supported composition from each other.
A process for supporting a polymethylaluminoxane on a silica carrier, said process comprising:
- a) forming a slurry consisting of porous silica in toluene, the slurry being at a higher temperature than about -10.degree. C.;
- b) cooling the slurry to about -10.degree. C. and adding thereto a solution of a polymethylaluminoxane in toluene while keeping the temperature below 40.degree. C., to thereby form a mixture consisting of the silica, the polymethylaluminoxane, and toluene;
- c) enclosing the mixture formed in b) inside a sealed vessel and raising the temperature of the sealed vessel to about 130.degree. C. with an internal pressure of about 30 psig such that a supported composition is produced;
- and
- d) opening said sealed vessel after the supported composition has been formed therein, and separating the toluene and the supported composition from each other.
Dependencies are inferred from the claim text.