Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Plural component system comprising a - group i to iv metal...
Reexamination Certificate
2005-02-15
2005-02-15
Rabago, Roberto (Department: 1713)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Plural component system comprising a - group i to iv metal...
C502S104000, C502S113000, C502S115000, C502S117000, C502S119000, C502S120000, C502S125000, C502S129000, C526S114000, C526S119000
Reexamination Certificate
active
06855654
ABSTRACT:
The invention relates to a process for uniformly dispersing a transition metal metallocene complex on a carrier comprising(1) providing silica which is porous and has a particle size of 1 to 250 microns, having pores which have an average diameter of 50 to 500 Angstroms and having a pore volume of 0.5 to 5.0 cc/g;(2) slurrying the silica in an aliphatic solvent having a boiling point less than 110° C.;(3) providing a volume of a solution comprising the metallocene complex, alumoxane of formulas R—(Al(R)—O—)x—AlR2for oligomeric linear alumoxanes and (—Al(R)—O—)yfor cyclic alumoxanes wherein x is 1-40, y is 3-40, and R is a C1-C8alkyl group in an aromatic and a solvent wherein the volume of solution is less than that required to form a slurry of the silica, wherein the concentration of alumoxane, expressed as Al weight percent, is 5 to 20;(4) contacting the silica slurry (2) with said volume of said solution (3) and allowing the solution to impregnate the pores of silica and, to disperse the metallocene in and on the carrier;(5)evaporating the solvents from the contacted and impregnated silica to recover dry free-flowing catalyst particles.
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Kissin Yury V.
Mink Robert I.
Nowlin Thomas E.
Schregenberger Sandra D.
Shirodkar Pradeep P.
ExxonMobil Oil Corporation
Griffis Andrew B.
Milbank Mandi B.
Moreno Louis N.
Rabago Roberto
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