Dynamic Surface Tension and Diffusivity Measurements of NG-CSSX Next Generation Solvent.

Fondeur, F. F. ; Peters, T. B.

Technical Information Center Oak Ridge Tennessee

关键词: Radioactive waste processing;    Solvent extraction;    Aqueous solutions;    Cesium;    Chemical components;   

RP-ID  :  DE141135785

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

Since 2008, the Savannah River Site has processed more than four million gallons of radioactive supernatant. To continue compliance with downstream processes, MCU is switching to the improved solvent called Next Generation Solvent (NG-CSSX). The new solvent formulation promises higher cesium removal efficiency and laboratory testing suggests the potential of higher processing rates. Similarly, laboratory testing demonstrated improvements in separation of the solvent from the effluent aqueous streams. To complete implementation at MCU, additional work was needed to develop methods that can measure physical properties relevant to the performance of the new solvent. This work measures two relevant physical properties: static interfacial tension and diffusvity. Both properties play a relevant role in mixing and separating immiscible liquids. This work evaluated the impact of changes in composition or aqueous phase on these physical properties to gauge the sensitivity of the system to the losses of chemical components. This work found that the suppressor, TiDG, when it contacts 10 mM boric acid ionizes and lowers the interfacial tension between NGS-CSSX and boric acid. The interfacial tension lowering is not sufficient to stop NGS-CSSX droplet coalescing.