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US 4,248,735 AGranted
Treatment of silica
AssigneePhillips Petroleum Company
InventorsMax P. McDaniel, Melvin B. Welch
Life of this patent
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AssigneePhillips Petroleum Company
InventorsMax P. McDaniel, Melvin B. Welch
Estimating the term…
A silica-containing composition suitable for supporting chromium to produce a catalyst capable of giving high melt flow olefin polymers for such applications as injection molding and the like requiring a narrow molecular weight distribution, is produced by treating a silica-containing material at an elevated temperature with either (1) CO, (2) a bromine or iodine component, or (3) an oxygen-containing sulfur component, more specifically a carbon, oxygen and sulfur-containing component. Thereafter, anhydrous chromium can be added, for instance, by means of a hydrocarbon solution of a soluble chromium compound, and the resulting composition activated in air to produce a catalyst. The bromine or iodine treated silica contains bound bromine or iodine if the treating agent is HBr, HI, an organic halide of Br or I or elemental Br or I used in conjunction with a reducing agent. This material is a novel composition of matter and is suitable for use as a reinforcing agent in rubber or plastics and as a support for a chromatographic column in addition to being suitable for supporting a chromium compound to produce a catalyst.
A method for producing a catalyst comprising subjecting a silica-containing support at an elevated temperature to a treating ambient selected from (1) carbon monoxide, (2) a halogen-containing component selected from bromine, iodine, HBr, HI, organic bromides, and organic iodides, which halogen-containing component also either contains air or is followed by air or (3) a carbon, oxygen and sulfur-containing composition, thereafter incorporating a chromium compound under anhydrous conditions to thus form said catalyst and thereafter activating said catalyst in an oxygen ambient.
A method for producing an iodinated or brominated silica comprising subjecting a silica-containing composition at a temperature within the range of 500.degree.-1000.degree. C. under reducing conditions to a treating ambient selected from at least one of (a) elemental iodine or elemental bromine plus a reducing agent;
A composition comprising silica containing 0.01-20 weight percent of a halogen selected from bromine and iodine based on the weight of said silica, said composition being further characterized by said halogen being bound directly to silicon atoms.
A composition comprising silica containing 0.001 to 1 millimoles of a halogen selected from bromine and iodine per 100 square meters of surface area of said silica, said composition being further characterized by said halogen being bound directly to silicon atoms.
A composition comprising silica containing 0.01-20 weight percent of a halogen selected from bromine and iodine based on the weight of said silica, said composition being further characterized by said halogen not coming off at 871.degree. C. in CO or N.sub.2.
A method of making a free radical containing silica composition comprising subjecting a silica-containing composition at a temperature within the range of 500.degree.-1000.degree. C. under reducing conditions to a treating ambient selected from (a) elemental iodine plus a reducing agent;
Dependencies are inferred from the claim text.