Synthesis of stable solutions of rare earth tris...

Details Synthesis of stable solutions of rare earth tris... Synthesis of stable solutions of rare earth tris...

2000-04-25

2004-07-27

Anthony, Joseph D. (Department: 1714)

Colloid systems and wetting agents; subcombinations thereof; pro

Continuous liquid or supercritical phase: colloid systems;...

Primarily organic continuous liquid phase

C516S031000, C534S015000, C556S002000, C556S005000, C556S015000, C556S019000, C556S024000, C558S071000, C558S089000, C568S008000, C252S189000

Reexamination Certificate

active

06767927

ABSTRACT:

FIELD OF THE INVENTION
The invention relates to the production of stable solutions of rare earth tris (organophosphates) in a hydrocarbon solvent.
BACKGROUND INFORMATION
The production of rare earth tris (organophosphates), particularly rare earth alkylphosphates, in various solvents is generally a straightforward process. Due to their low solubility in water and common organic solvents, the rare earth tris (organophosphates) precipitate easily. The poor solubility of these compositions is noted in the article, “DEHP complexes of lanthanides (III) and actinides (III),” Suglobov et al., Journal of Alloys and Compounds, 213/214 (1994) 523-527. Suglobov et al. point out that “LnA
3
(A=dialkylphosphate) is very poorly soluble in alkanes as well as in donor solvents.,” See the Abstract page 523 of Suglobov et al. The lower solubility of the rare earth tris (organophosphates) in hydrocarbon solvents, compared to, for instance, rare earth neo acid complexes, is mainly due to the presence of the phosphorous atoms which considerably lowers the organic character of the molecule. Providing rare earth tris (organophosphates) in a hydrocarbon solvent is desirable for manufacturers utilizing the rare earth tris (organophosphates) for preparation of catalysts. If the rare earth tris (organophosphates) could be stable in the hydrocarbon solvent, i.e., not precipitate over an extended period of time, such a product would be very beneficial for the manufacturing formulator.
It is an aspect of the present invention to produce solutions comprising a rare earth tris (organophosphate) and a hydrocarbon solvent wherein said solutions are stable from precipitation of the rare earth tris (organophosphate) for at least about thirty days.
It is another aspect of the present invention to introduce a process, which by a combination of beneficial experimental conditions, allows the production of highly stable solutions of a rare earth tris (organophosphate) in a hydrocarbon solvent.
These and other aspects of the invention are discussed in detail below.
SUMMARY OF THE INVENTION
The stable rare earth tris (organophosphate) solutions comprise a rare earth tris (organophosphate) and a hydrocarbon solvent. Preferably, from about 2% to about 10% rare earth element, preferably from about 3% to about 8%, is present in the solutions. Unless otherwise stated, all parts, ratios or percents are by weight. The rare earth tris (organophosphate) solutions are stable from precipitation of the rare earth tris (organophosphate) for at least about fifteen (15) days, preferably for at least about twenty (20) days and most preferably at least about thirty (30) days. A process for preparing these solutions is described herein.
As used herein, “alkyl” means a carbon-containing chain which may be straight, branched or cyclic; substituted (mono- or poly-) or unsaturated; and saturated.
As used herein, “aryl” means an aromatic; substituted (mono- or poly-) or unsaturated.
As used herein, “free acid” means the H
+
concentration as measured by conventional methods.
As used herein, the terms “rare earth tris (organophosphate)”, “organophosphate”, “alkylphosphate”, “base”, “stabilizing additive” and “rare earth salt” shall encompass the singular and plural, as well as, to encompass mixtures of the respective compounds.
“Comprising” as used herein, means various components can be conjointly employed. Accordingly, the terms “consisting essentially of” and “consisting of” are embodied in the term comprising.


REFERENCES:
patent: 3047601 (1962-07-01), Oliver
patent: 3110556 (1963-11-01), Peppard et al.
patent: 3539941 (1970-11-01), Halverson
patent: 4749560 (1988-06-01), Elgavish
patent: 5057627 (1991-10-01), Edwards
patent: 5130052 (1992-07-01), Kreh et al.
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patent: 5674985 (1997-10-01), Hawkins et al.
D.M. Suglobov et al., “DEHP Complexes of Lanthanides (III) and actinides (III),”Journal of Alloys and Compounds, 213/214, pp. 523-527, 1994.

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