Titanium/zirconium/cerium oxide granular particulates/agglomerates
AssigneeRhone-Poulenc Chimie
InventorFrancois Parmentier
Life of this patent
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Abstract
Porous, granular particulates of titanium, zirconium or cerium oxide, preferably essentially spherical in shape, and having a specific volume of at least 0.1 cm.sup.3 /g and an apparent packed density of at least 0.2, are prepared by (a) intimately admixing a suspension or sol of titanium, zirconium or cerium oxide, at least one hydrophobic agent, and at least one organic solvent which is immiscible or only slightly miscible with water, thus producing a liquid phase essentially devoid of oxide values and granular solids based on titanium, zirconium or cerium oxide, (b) separating the liquid phase from the granular solids, and, optionally, (c) washing, drying and calcining the granular solids.
Claims32
A process for the preparation of agglomerates of titanium oxide, zirconium oxide or cerium oxide, comprising the steps of:
- (a) intimately admixing under agitation an aqueous suspension or sol of titanium oxide, zirconium oxide or cerium oxide, at least one hydrophobic agent comprising a cationic hydrophobic agent, amphoteric hydrophobic agent, or anionic hydrophobic agent, and at least one organic solvent which is immiscible or only slightly miscible with water in an amount sufficient to effectively agglomerate said titanium oxide, zirconium oxide or cerium oxide and less than an amount which causes the resulting oxide agglomerates to adhere to one another in a compact mass, said at least one organic solvent comprising an ester, ether or ketone;
- (b) maintaining the agitation of said admixture until a medium is obtained consisting essentially of agglomerates of titanium oxide, zirconium oxide or cerium oxide, and an aqueous liquid phase, said aqueous liquid phase being essentially devoid of titanium oxide, zirconium oxide or cerium oxide;
- and
- (c) separating said aqueous liquid phase from said agglomerates of titanium oxide, zirconium oxide or cerium oxide.
A process for the preparation of agglomerates of titanium oxide, zirconium oxide or cerium oxide, comprising the steps of:
- (a) intimately admixing under agitation an aqueous suspension or sol of titanium oxide, zirconium oxide or cerium oxide, at least one hydrophobic agent comprising a cationic hydrophobic agent, amphoteric hydrophobic agent, or anionic hydrophobic agent, and at least one organic solvent which is immiscible or only slightly miscible with water in an amount sufficient to effectively agglomerate said titanium oxide, zirconium oxide or cerium oxide and less than an amount which causes the resulting oxide agglomerates to adhere to one another in a compact mass, said at least one organic solvent comprising toluene or xylene;
- (b) maintaining the agitation of said admixture until a medium is obtained consisting essentially of agglomerates of titanium oxide, zirconium oxide or cerium oxide, and an aqueous liquid phase, said aqueous liquid phase being essentially devoid of titanium oxide, zirconium oxide or cerium oxide;
- and
- (c) separating said aqueous liquid phase from said agglomerates of titanium oxide, zirconium oxide or cerium oxide.
A process for the preparation of agglomerates of titanium oxide, zirconium oxide or cerium oxide, comprising the steps of:
- (a) intimately admixing under agitation an aqueous suspension or sol of titanium oxide, zirconium oxide or cerium oxide, at least one hydrophobic agent comprising a cationic hydrophobic agent, amphoteric hydrophobic agent, or anionic hydrophobic agent, and at least one organic solvent which is immiscible or only slightly miscible with water in an amount sufficient to effectively agglomerate said titanium oxide, zirconium oxide or cerium oxide and less than an amount which causes the resulting oxide agglomerates to adhere to one another in a compact mass, said at least one organic solvent comprising a halogenated aliphatic hydrocarbon or a halogenated alicyclic hydrocarbon;
- (b) maintaining the agitation of said admixture until a medium is obtained consisting essentially of agglomerates of titanium oxide, zirconium oxide or cerium oxide, and an aqueous liquid phase, said aqueous liquid phase being essentially devoid of titanium oxide, zirconium oxide or cerium oxide;
- and
- (c) separating said aqueous liquid phase from said agglomerates of titanium oxide, zirconium oxide or cerium oxide.
Dependencies are inferred from the claim text.