The Caustic Side Solvent Extraction (CSSX) process used at the Savannah River Site for the selective cesium removal from high-level salt waste has been markedly improved leading to the Next Generation CSSX (NG-CSSX) process. The NG-CSSX solvent involves the new and more soluble mono-crown calixarene extractant, MaxCalix. The purpose of this study was to determine the effects of thermal degradation over time on NG-CSSX process. The NG-CSSX solvent prepared with N,N',N'-tris(3,7-dimethyloctyl)guanidine (TiDG) was left in contact with simulant waste over a period of four months at above-normal operating temperatures (35-37�C). The performance of the solvent was tested initially and then every 30 days after. Tests were carried out under standard operating conditions at 25�C with SRS-15 simulant waste, 25mM NaOH scrub solution, and 10mM H3BO3 strip solution.This research was sponsored by the Office of Technology Innovation and Development, the Office of Environmental Management, and the U.S. Department of Energy

Thermal stability study of the NG-CSSX solvent containing a new guanidine suppressor

245th National Meeting (2013)

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