Third phase formation in TBP solvent extraction systems as a result of interaction between reverse micelles

R. Chiarizia; P. Thiyagarajan; M. P. Jensen; M. Borkowski; K. C. Littrell

Third phase formation in TBP solvent extraction systems as a result of interaction between reverse micelles

R. Chiarizia, P. Thiyagarajan, M. P. Jensen, M. Borkowski, K. C. Littrell

Research output: Contribution to conference › Paper › peer-review

11 Scopus citations

Abstract

Third phase formation, i.e., the splitting of the organic phase in two layers, is a common feature observed, under conditions of high loading, for many solvent extraction systems of both analytical and industrial interest. Although this phenomenon has been investigated in a large number of works, a structural and physico-chemical description is still lacking. In this work, small-angle neutron scattering (SANS) data for the tri-n-butylphosphate (TBP)-n-octane, Th(NO₃)₄-HNO₃ solvent extraction system have been interpreted using the Baxter model for hard-spheres with surface adhesion. The increase in scattering intensity in the low Q range, observed when increasing amounts of HNO₃ and/or Th(NO ₃)₄ are introduced into the organic phase, has been interpreted as arising from interactions between small reverse micelles containing three TBP molecules plus solutes in their polar core. This intermicellar attraction, under appropriate conditions, leads to third phase formation.

Original language	English
Pages	917-928
Number of pages	12
State	Published - 2003
Externally published	Yes
Event	Hydrometallurgy 2003: Proceedings of the 5th International Symposium - Vancouver, BC, Canada Duration: Aug 24 2003 → Aug 27 2003

Conference

Conference	Hydrometallurgy 2003: Proceedings of the 5th International Symposium
Country/Territory	Canada
City	Vancouver, BC
Period	08/24/03 → 08/27/03

Cite this

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title = "Third phase formation in TBP solvent extraction systems as a result of interaction between reverse micelles",

abstract = "Third phase formation, i.e., the splitting of the organic phase in two layers, is a common feature observed, under conditions of high loading, for many solvent extraction systems of both analytical and industrial interest. Although this phenomenon has been investigated in a large number of works, a structural and physico-chemical description is still lacking. In this work, small-angle neutron scattering (SANS) data for the tri-n-butylphosphate (TBP)-n-octane, Th(NO3)4-HNO3 solvent extraction system have been interpreted using the Baxter model for hard-spheres with surface adhesion. The increase in scattering intensity in the low Q range, observed when increasing amounts of HNO3 and/or Th(NO 3)4 are introduced into the organic phase, has been interpreted as arising from interactions between small reverse micelles containing three TBP molecules plus solutes in their polar core. This intermicellar attraction, under appropriate conditions, leads to third phase formation.",

author = "R. Chiarizia and P. Thiyagarajan and Jensen, {M. P.} and M. Borkowski and Littrell, {K. C.}",

year = "2003",

language = "English",

pages = "917--928",

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T1 - Third phase formation in TBP solvent extraction systems as a result of interaction between reverse micelles

AU - Chiarizia, R.

AU - Thiyagarajan, P.

AU - Jensen, M. P.

AU - Borkowski, M.

AU - Littrell, K. C.

PY - 2003

Y1 - 2003

N2 - Third phase formation, i.e., the splitting of the organic phase in two layers, is a common feature observed, under conditions of high loading, for many solvent extraction systems of both analytical and industrial interest. Although this phenomenon has been investigated in a large number of works, a structural and physico-chemical description is still lacking. In this work, small-angle neutron scattering (SANS) data for the tri-n-butylphosphate (TBP)-n-octane, Th(NO3)4-HNO3 solvent extraction system have been interpreted using the Baxter model for hard-spheres with surface adhesion. The increase in scattering intensity in the low Q range, observed when increasing amounts of HNO3 and/or Th(NO 3)4 are introduced into the organic phase, has been interpreted as arising from interactions between small reverse micelles containing three TBP molecules plus solutes in their polar core. This intermicellar attraction, under appropriate conditions, leads to third phase formation.

AB - Third phase formation, i.e., the splitting of the organic phase in two layers, is a common feature observed, under conditions of high loading, for many solvent extraction systems of both analytical and industrial interest. Although this phenomenon has been investigated in a large number of works, a structural and physico-chemical description is still lacking. In this work, small-angle neutron scattering (SANS) data for the tri-n-butylphosphate (TBP)-n-octane, Th(NO3)4-HNO3 solvent extraction system have been interpreted using the Baxter model for hard-spheres with surface adhesion. The increase in scattering intensity in the low Q range, observed when increasing amounts of HNO3 and/or Th(NO 3)4 are introduced into the organic phase, has been interpreted as arising from interactions between small reverse micelles containing three TBP molecules plus solutes in their polar core. This intermicellar attraction, under appropriate conditions, leads to third phase formation.

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M3 - Paper

AN - SCOPUS:1642365634

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T2 - Hydrometallurgy 2003: Proceedings of the 5th International Symposium

Y2 - 24 August 2003 through 27 August 2003

ER -

Third phase formation in TBP solvent extraction systems as a result of interaction between reverse micelles

Abstract

Conference

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