Temperature and flow rate effects on the ion-exchange separation of erbium and thulium

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1960-05-01
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Sellers, Irvin
Powell, J.
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Ames National Laboratory

Ames National Laboratory is a government-owned, contractor-operated national laboratory of the U.S. Department of Energy (DOE), operated by and located on the campus of Iowa State University in Ames, Iowa.

For more than 70 years, the Ames National Laboratory has successfully partnered with Iowa State University, and is unique among the 17 DOE laboratories in that it is physically located on the campus of a major research university. Many of the scientists and administrators at the Laboratory also hold faculty positions at the University and the Laboratory has access to both undergraduate and graduate student talent.

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Abstract

The concept of a theoretical plate has been applied as a column operation parameter to evaluate the effects of flow rate and temperature on the separation of erbium and thulium with HEDTA using an ion-exchange technique. It has been shown that for separations made at constant temperatures the overlap between the pure forms is directly proportional to the flow rate at all practical flow rates and temperatures. The changes in the HETP were easily explained in terms of the ion-exchange kinetic theory. We would expect a decrease in the HETP for any other change in the system which would facilitate the diffusion of ions through the resin particle, i.e., resin of small particle size or a resin of low cross-linkage.

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