Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Silicon containing or process of making
Reexamination Certificate
2007-08-13
2010-12-14
Choi, Ling-Siu (Department: 1796)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Silicon containing or process of making
C502S103000, C502S107000, C502S132000, C526S104000, C526S352000
Reexamination Certificate
active
07851400
ABSTRACT:
The present invention concerns a catalyst for the production of high density polyethylene, by homopolymerising ethylene or copolymerising ethylene and an alpha-olefinic comonomer comprising 3 to 10 carbon atoms, prepared by the steps of:a) selecting a silica support with a specific surface area larger than 300 m2/g;b) treating the silica support with a titanium compound, in order to introduce titanium into the support, or with an aluminium compound, in order to introduce aluminum into the support;c) either treating the titanated silica support with an aluminum compound, in order to introduce aluminum into the titanated silica support, or treating the aluminated silica support with a titanium compound, in order to introduce titanium into the aluminated silica support;d) depositing a chromium compound on the titanated and aluminated silica support to form a catalyst;e) activating the catalyst of step d) under air in a fluidised bed at a temperature of from 600 to 800° C.
REFERENCES:
patent: 5885924 (1999-03-01), Ward
patent: 0 905 148 (1999-03-01), None
patent: 0 962 469 (1999-12-01), None
Bodart Philippe
Debras Guy
Lonfils Nicodeme
Choi Ling-Siu
Krueger Tenley R.
Total Petrochemicals Research Feluy
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