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US 6,271,269 B1Granted
Organic colloidal dispersions of acidic metal values
AssigneeRhodia Chimie
InventorsJean-Yves Chane-Ching, Frederic Fabre, Christian Herviou
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Abstract
Storage-stable sols are comprised of a colloidal dispersion of at least one compound of an acidic metal cation, Mn+, for example, cerium (IV) and/or iron (III), in an organic phase which comprises an organic liquid medium and an organic acid. The title sols are conveniently prepared via the phase transfer of colloidal particulates from a counterpart aqueous colloidal dispersion.
Claims20
A process for the preparation of a storage-stable organic sol comprising:
- (i) reacting (a) a base reactant with (b) at least one aqueous solution of a salt of an acidic metal cation Mn+ to form (c) an aqueous colloidal dispersion of Mn+ values, in respective amounts of (a) and (b) effective to provide in the aqueous colloidal dispersion (c) a degree of supersaturation r in OH− ions, wherein r is defined by the following equation,
- r=(n3=n2)/n1
- wherein n1 is the number of moles of Mn+ values present in the colloidal dispersion(s), n2 is the number of moles of OH− necessary to neutralize acidity introduced via the aqueous solution(s) of acidic metal cation(s) Mn+, and n3 is the total number of moles of OH− introduced by the base reactant;
- (ii) contacting the resulting aqueous colloidal dispersion of Mn+ values with (d) an organic phase comprising (d1) an organic liquid medium and (d2) an organic acid, to form (e) an aqueous/organic phase mixture;
- and
- (iii) separating mixture (e) into an aqueous phase and a product organic phase.
3 more elements
Dependencies are inferred from the claim text.