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US 2017/0320747 A1Published application
Methods for processing fumed metallic oxides
AssigneeSaudi Arabian Oil Company
InventorMichele Louisa Ostraat
Life of this patent
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Abstract
Novel methods for processing fumed metallic oxides into globular metallic oxide agglomerates are provided. The methodology may allow for fumed metallic oxide particles, such as fumed silica and fumed alumina particles, to be processed into a globular morphology to improve handling while retaining a desirable surface area. The processes may include providing fumed metallic oxide particles, combining the particles with a liquid carrier to form a suspension, atomizing the solution of suspended particles, and subjecting the atomized droplets to a temperature range sufficient to remove the liquid carrier from the droplets, to produce metallic oxide-containing agglomerations.
Claims28
A method for processing fumed silica into silica agglomerations comprising:
- providing fumed silica particles, wherein the fumed silica particles have a first Brunauer Emmett Teller (BET) surface area of greater than about 50 meters squared per gram (m2/g), and are characterized by a dominant branched morphology comprising from 5 nanometer (nm) to 50 nm primary particles, with an average bulk density of less than 64 kilograms per cubic meter (kg/m3);
- combining the fumed silica particles with a liquid carrier to form a solution of suspended fumed silica particles, wherein the solution of suspended fumed silica particles comprises from about 2 weight percent (wt %) to about 8 wt % of the fumed silica particles;
- atomizing the solution of suspended fumed silica particles to produce silica-containing droplets, wherein at least a majority of the silica-containing droplets are characterized by a droplet diameter of about 250 nm to about 100 micrometers (μm) and a fumed silica particle weight percentage of from about 2 wt % to about 8 wt %;
- and
- subjecting the silica-containing droplets to a temperature of from about 50° C. to about 1500° C. for a period of time of at least about 0.5 seconds to substantially remove the liquid carrier from the silica-containing droplets to produce the silica agglomerations, wherein substantially all of the produced silica agglomerations exhibit a second BET surface area that is at least about 75% of the first BET surface area, and a dominant globular morphology characterized by an average bulk density of greater than 64 kg/m3.
2 more elements
A method for processing fumed metallic oxides comprising:
- providing fumed metallic oxide particles, wherein the fumed metallic oxide is selected from the group consisting of SiO2, Al2O3, TiO2, CeO2, B2O3, ZrO2, GeO2, WO3, Nb2O5, and combinations thereof, wherein the fumed metallic oxide particles have a first Brunauer Emmett Teller (BET) surface area of greater than about 50 m2/g, and a dominant branched morphology comprising from 5 nm to 50 nm primary particles;
- combining the fumed metallic oxide particles with a liquid carrier to form a solution of suspended fumed metallic oxide particles, wherein the solution of suspended fumed metallic oxide particles comprises from about 2 wt % to about 8 wt % of the fumed metallic oxide particles;
- atomizing the solution of suspended fumed metallic oxide particles to produce metallic oxide-containing droplets, wherein at least a majority of the metallic oxide-containing droplets are characterized by a droplet diameter of about 250 nm to about 100 μm and a fumed metallic oxide particle weight percentage of from about 2 wt % to about 8 wt %;
- and
- subjecting the metallic oxide-containing droplets to a temperature of from about 50° C. to about 1500° C. for a period of time of at least about 0.5 seconds to substantially remove the liquid carrier from the metallic oxide-containing droplets to produce metallic oxide agglomerations, wherein substantially all of the produced metallic oxide agglomerations exhibit a dominant globular morphology and a second BET surface area that is at least about 75% of the first BET surface area.
2 more elements
A method for processing fumed silica into silica agglomerations comprising:
- providing fumed silica particles, wherein the fumed silica particles have a first Brunauer Emmett Teller (BET) surface area of from about 200 m2/g to about 600 m2/g, and are characterized by a dominant branched morphology comprising from 5 nm to 50 nm primary particles, with an average bulk density of less than 64 kilograms per cubic meter (kg/m3);
- combining the fumed silica particles with a liquid carrier to form a solution of suspended fumed silica particles, wherein the solution of suspended fumed silica particles comprises from about 2 weight percent (wt %) to about 8 wt % of the fumed silica particles;
- atomizing the solution of suspended fumed silica particles to produce silica-containing droplets, wherein at least a majority of the silica-containing droplets are characterized by a droplet diameter of about 250 nm to about 100 micrometers (μm) and a fumed silica particle weight percentage of from about 2 wt % to about 8 wt %;
- and
- subjecting the silica-containing droplets to a temperature of from about 850° C. to about 1500° C. for a period of time of at least about 0.5 seconds to substantially remove the liquid carrier from the silica-containing droplets to produce the silica agglomerations, wherein substantially all of the produced silica agglomerations exhibit a second BET surface area that is at least about 85% of the first BET surface area, and a dominant globular morphology characterized by an average bulk density of greater than 64 kg/m3.
2 more elements
Dependencies are inferred from the claim text.