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AssigneeThe United States of America as represented by the United States Energy Research and Development Administration
InventorWesley D. Arnold, Jr.
Estimating the term…
A method for separating mono-octylphenyl phosphoric acid ester and di-octylphenyl phosphoric acid ester from a mixture thereof comprises reacting the ester mixture with a source of lithium or sodium ions to form a mixture of the phosphate salts; contacting the salt mixture with an organic solvent which causes the dioctylphenyl phosphate salt to be dissolved in the organic solvent phase and the mono-octylphenyl phosphate salt to exist in a solid phase; separating the phases; recovering the phosphate salts from their respective phases; and acidifying the recovered salts to form the original phosphoric acid esters.
A method of separating a mono-octylphenyl phosphoric acid ester from a mixture containing mono- and di-octylphenyl phosphoric acid esters, said method comprising:
Dependencies are inferred from the claim text.
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No related US applications are recorded in the indexed filing history.
Phosphorus compounds: purification; Separation; Stabilisation; Desodorisation of organo-phosphorus compounds
Esters of phosphoric acids: with hydroxyaryl compounds
Acyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen
Term ended 27 Sep 1994 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
This invention was made in the course of, or under, a contract with the Energy Research and Development Administration. This invention relates to the art of separating mono-octylphenyl and di-octylphenyl esters of phosphoric acid and more particularly to a solid/liquid separation process where the mono-octylphenyl phosphoric acid ester is separated and recovered from the solid phase.
The separation process of this invention is particularly useful for providing a substantially pure mono-octylphenyl phosphoric acid ester for use as a make-up component for the extractant in a process for recovering uranium from wet-process phosphoric acid. Such a process is more fully described in commonly assigned U.S. Pat. No. 3,835,214 issued Sept. 10, 1974 to Hurst et al. for "Oxidative Stripping Process for the Recovery of Uranium from Wet-Process Phosphoric Acid" the disclosure of which is incorporated herein in its entirety by reference.
In the Hurst et al. process, uranium values present in the feed solution (5 to 6 M H.sub.3 PO.sub.4) are concentrated in a first cycle by a factor of 70 to 100 by extracting into an organic phase (typically a mixture of mono- and di-octylphenyl esters of orthophosphoric acid dissolved in an inert diluent) and stripping from the organic phase into an 8 to 12 M H.sub.3 PO.sub.4 solution containing an oxidizing agent. During the course of operation of the Hurst et al. process, the first cycle extractant which is continuously recycled becomes depleted in the mono-octylphenyl ester due to its slight solubility in the aqueous H.sub.3 PO.sub.4 solution.
Commercial grade octylphenyl phosphoric acid was obtained from Mobil Chemical Company; P.O. Box 26683; Richmond, Va. and identified as octylphenyl acid phosphate containing a mixture of mono-para-1,1,3,3, tetramethylbutylphenyl orthophosphoric acid represented by the formula
CH.sub.3 --C(CH.sub.3).sub.2 --CH.sub.2 --C(CH.sub.3).sub.2 --C.sub.6 H.sub.4 --O--PO--(OH).sub.2
and di-para 1,1,3,3 tetramethylbutylphenyl orthophosphoric acid, represented by the formula