On the origin of haze in extraction solvents: Dilution-Induced supersaturation of water

Bruce A. Moyer; Faith I. Case

doi:10.1080/07366299108918055

On the origin of haze in extraction solvents: Dilution-Induced supersaturation of water

Bruce A. Moyer, Faith I. Case

Chemical Separations Group

Research output: Contribution to journal › Article › peer-review

Abstract

The precipitation of fine aqueous droplets as “haze” or entrainment in dodecane solutions of di-2-ethylhexylsulfoxide (DEHSO) is demonstrated in experiments in which water-saturated dodecane solutions of DEHSO are diluted with water-saturated dodecane at 25 °C. The resulting turbidity correlates with the concentration of excess water predicted from an analysis of the water extraction behavior of DEHSO. Underlying the dilution-induced turbidity is the destabilization of dimer hydrates (DEHSO)2(H2O)n. causing the release of water to the solvent. Other neutral oxygen-donor extractants are expected to exhibit this effect, which may provide additional insight into the appearance of turbidity and associated problems in certain solvent extraction systems.

Original language	English
Pages (from-to)	277-288
Number of pages	12
Journal	Solvent Extraction and Ion Exchange
Volume	9
Issue number	2
DOIs	https://doi.org/10.1080/07366299108918055
State	Published - Apr 1 1991

Funding

This research was supponed by the Division of Chemical Sciences, Office of Basic Energy Sciences. U. S. Department of Energy under contract DE-AC05-840R21400 with Manin Marietta Energy Systems. Inc. We would also like to thank C. F. Coleman and T. C. Scott for helpful suggestions both in carrying out the work and in the preparation of the manuscript and R. A. Sachleben for assistance with purification of DEHSO. *This research was supported by the Division of Chemical Sciences. Officc of Basic Encrgy Sciences. U. S. Dcpanment of Encrgy under contract DE-AC05-840R21400 with Manin Marietta Encrgy Systems. Inc.

Funders	Funder number
Division of Chemical Sciences
U.S. Department of Energy	DE-AC05-840R21400

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abstract = "The precipitation of fine aqueous droplets as “haze” or entrainment in dodecane solutions of di-2-ethylhexylsulfoxide (DEHSO) is demonstrated in experiments in which water-saturated dodecane solutions of DEHSO are diluted with water-saturated dodecane at 25 °C. The resulting turbidity correlates with the concentration of excess water predicted from an analysis of the water extraction behavior of DEHSO. Underlying the dilution-induced turbidity is the destabilization of dimer hydrates (DEHSO)2(H2O)n. causing the release of water to the solvent. Other neutral oxygen-donor extractants are expected to exhibit this effect, which may provide additional insight into the appearance of turbidity and associated problems in certain solvent extraction systems.",

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AB - The precipitation of fine aqueous droplets as “haze” or entrainment in dodecane solutions of di-2-ethylhexylsulfoxide (DEHSO) is demonstrated in experiments in which water-saturated dodecane solutions of DEHSO are diluted with water-saturated dodecane at 25 °C. The resulting turbidity correlates with the concentration of excess water predicted from an analysis of the water extraction behavior of DEHSO. Underlying the dilution-induced turbidity is the destabilization of dimer hydrates (DEHSO)2(H2O)n. causing the release of water to the solvent. Other neutral oxygen-donor extractants are expected to exhibit this effect, which may provide additional insight into the appearance of turbidity and associated problems in certain solvent extraction systems.

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On the origin of haze in extraction solvents: Dilution-Induced supersaturation of water

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