Di-2-ethylhexyl phosphoric acid

Solvent Extraction. Liquid—hquid extractioa, well known ia the chemical iadustry, was first used ia extractive metallurgy for the processiag of uranium. When a dilute solution of uranium is contacted with an extractant such as di(2-ethylhexyl) phosphoric acid (D2EHPA) or R2HPO4, dissolved ia... [Pg.171]

Ryon, Daley, and Lowrie [Chem. Eng. Ftog., 55(10), 70, (1959), U.S. AFC ORNL-2951, I960]. Continuous extraction of uranium from sulfate-ore-leach liquors and kerosine -t- trihiityl phosphate and di(2-ethylhexyl)-phosphoric acid baffled vessels, turbine agitated. There is strong evidence of the influence of a slow chemical reaction. [Pg.1467]

MEMBRANE EXTRACTION AND SEPARATION OF COPPER(II) FROM PLATINUM(IV) BY DI(2-ETHYLHEXYL)PHOSPHORIC ACID DURING ELECTRODIALYSIS... [Pg.283]

The extractant is di(2-ethylhexyl) phosphoric acid (DEHPA) in conjuction with trioctyl phosphine oxide (TOPO). Stripping is by ammonium carbonate, and uranium precipitates as ammonium uranyl tricarbonate. The mixture shows a synergistic effect. The mixture is stable, and extracts uranium in hexavalent state. [Pg.552]

KL-HDEHP = 50% di(2-ethylhexyl) phosphoric acid, 60-100 mesh resin PERALS = Photon/electron rejecting alpha liquid scintillation TNOA = tri-n-octylamine TRU = transuranic... [Pg.212]

Suyama, T. Awakura, Y. Hirato, T. Konto, M. Majima, H. Extraction and stripping characteristics of Ni(II) with di(2-ethylhexyl)phosphoric acid under a high electrostatic field. Mater. Trans. JIM 1993, 34, 37 12. [Pg.803]

Dapex [Di-alkylphosphoric acid extraction] A process for the solvent extraction of uranium from sulfuric acid solutions using di-(2-ethylhexyl) phosphoric acid (HDEHP). The HDEHP is dissolved in kerosene containing 4 percent of tributyl phosphate. The uranium is stripped from the organic phase by aqueous sodium carbonate and precipitated as uranyl peroxide (yellow cake). The process was no longer in use in 1988. See also Amex. [Pg.79]

DEPA-TOPO [di (2-ethylhexyl) phosphoric acid and trioctylphosphine oxide] A process for recovering uranium from wet-process phosphoric acid, by solvent extraction with a mixture of the two named reagents. Developed at Oak Ridge National Laboratory and first commercialized in 1978 by Freeport Minerals Corporation and Wyoming Mineral Corporation. [Pg.84]

Zincex [Zinc extraction] A process for extracting zinc from pyrite cinder leachate, using organic solvents. The chloride leachate is first extracted with a secondary amine, and then with di(2-ethylhexyl)phosphoric acid to remove iron Developed by Tecnicas Reunidas, first commercialized in 1976, and now used in Spain and Portugal. [Pg.296]

Acidic alkyl esters of phosphoric acid, of which dibutyl-phosphoric acid (HDBP) and di(2-ethylhexyl) phosphoric acid (HDEHP) are typical,... [Pg.63]

During development of the Truex process, various monofunctional organophosphorus reagents [e.g., TBP DBBP (dibutylbutylphosphonate) HDEHP (di-(2-ethylhexyl)phosphoric acid)] were considered for removal of alpha-emitters from HNO3 waste solutions. Two typical flow sheets for the use of HDEHP and TBP are shown in Fig. 12.14. Because of the poor performance of these two extractants, the processes were complicated. Distribution ratios... [Pg.537]

DCTA 1,2-diaminocyclohexane tetraacetic acid DBP dibutyl phosphoric acid DTP A diethylenetriamine pentaacetic acid DEHPA di-2-ethylhexyl phosphoric acid... [Pg.716]

L-Phenyl- alanine Di-2-ethylhexyl phosphoric acid (D2EHPA) H2SO4 Counter-trans-port of H+ ELM Concentration as cation [47]... [Pg.225]

Di-(2-Ethylhexyl) Phosphoric Acid Di-(2-Ethylhexyl) Phosphoric Acid Dioctyl Phthalate Dioctyl Sodium Sulfosuccinate Tetraethylene Glycol... [Pg.26]

Di-(2-ethylhexyl)phosphoric acid ( diisooctyl phosphate) [272I5-I0-7] [298-07-7] M 322.4. Contaminants of commercial samples include the monoester, polyphosphates, pyrophosphate, 2-ethylhexanol and metal impurities. Dissolved in n-hexane to give an 0.8M soln. Washed with an equal volume of M HNO3, then with saturated (NH4)2CO3 soln, with 3M HNO3, and twice with water [Petrow and Allen AC 33 1303 1961], Similarly, the impure sodium salt, after scrubbing with pet ether, has been acidified with HCl and the free organic acid has been extracted into pet ether and purified as above. For purification via the copper salt see McDowell et al. [JINC 38 2127 1976]. [Pg.383]

The use of organophosphorus acids, such as di(2-ethylhexyl)phosphoric acid (D2EHPA di(2-ethylhexyl) monohydrogen phosphate 2 R = C4H9CH(Et)CH2), is now well established in the recovery of base metals. This reagent has found commercial application in the separation of cobalt from nickel,67 68 the separation of zinc from impurities such as copper and cadmium,69 the recovery of uranium,68 beryllium70 and vanadium,71 and in separations involving yttrium and the rare-earth metals.72 73... [Pg.792]

The extraction of some metal ions by di(2-ethylhexyl)phosphoric acid is shown in Figure 9.7 The order of extraction of the divalent metals of the first transition series, viz. Zn > Cr > M > Cu > Fe > Co > Ni > V, shows important differences from that observed with carboxyli acid extractants, particularly with respect to the relative positions of zinc and copper and of coba... [Pg.792]

U(VI) Solid(PVC) di(2-ethylhexyl) phosphoric acid Diamylamyl phosphonate... [Pg.148]

Note TBPO, tributylphosphine oxide. TOPO, trioctylphosphine oxide. TPPO, triphenylphosphine oxide, acac, acetyl acetone. HDEHP, di(2-ethylhexyl)phosphoric acid. MIBK, methylisobutyl ketone. DMDOHEMA, N,iV-diniethyl-iV,iV-dioctylhexylethoxymalonamide. [Pg.99]

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