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Fundamental investigation of the nex...

Hill, Talon G.

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Fundamental investigation of the next-generation caustic-side solvent extraction process.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Fundamental investigation of the next-generation caustic-side solvent extraction process./
作者:	Hill, Talon G.
面頁冊數:	145 p.
附註:	Source: Masters Abstracts International, Volume: 52-01.
Contained By:	Masters Abstracts International52-01(E).
標題:	Chemistry, General. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=1539736
ISBN:	9781303156809

Fundamental investigation of the next-generation caustic-side solvent extraction process.
Hill, Talon G.

Fundamental investigation of the next-generation caustic-side solvent extraction process. - 145 p.

Source: Masters Abstracts International, Volume: 52-01.

Thesis (M.S.)--Tennessee Technological University, 2013.

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 by development of the Next Generation CSSX (NG-CSSX) process. The NG-CSSX solvent involves the new, more soluble mono-crown calixarene extractant, MaxCalix. The solvent system has a greater capacity to extract cesium and yields the required decontamination factor of ≥40,000. An empirical equation has been developed that predicts the distribution ratio of cesium with <5% error based on the initial concentrations of MaxCalix, potassium, hydroxide, and nitrate. The thermodynamic equilibrium modeling program SXFIT has been applied to start creating a chemically plausible model for the NG-CSSX process.

ISBN: 9781303156809Subjects--Topical Terms:

1021807
Chemistry, General.

Fundamental investigation of the next-generation caustic-side solvent extraction process.
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245 1 0 $a Fundamental investigation of the next-generation caustic-side solvent extraction process.
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500 $a Source: Masters Abstracts International, Volume: 52-01.
500 $a Adviser: Dale D. Ensor.
502 $a Thesis (M.S.)--Tennessee Technological University, 2013.
520 $a 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 by development of the Next Generation CSSX (NG-CSSX) process. The NG-CSSX solvent involves the new, more soluble mono-crown calixarene extractant, MaxCalix. The solvent system has a greater capacity to extract cesium and yields the required decontamination factor of ≥40,000. An empirical equation has been developed that predicts the distribution ratio of cesium with <5% error based on the initial concentrations of MaxCalix, potassium, hydroxide, and nitrate. The thermodynamic equilibrium modeling program SXFIT has been applied to start creating a chemically plausible model for the NG-CSSX process.
520 $a The NG-CSSX employs a new more lipophilic guanidine analog to enhance the stripping of cesium from the solvent. The thermal degradation of this new guanidine was studied over time to evaluate its stability. The NG-CSSX solvent prepared with N,N',N"-tris(3,7-dimethyloctyl)guanidine (TiDG) was studied both in-contact and not-in-contact with highly alkaline salt-waste simulant SRS-15 over a period of three months at abnormal operating temperatures (36°C and 3°C). An extraction, scrub, strip, and extraction (ESSE) procedure was carried out every 30 days at 25°C which included an initial extraction of cesium from SRS-15, two scrubs of the solvent system with 25 mM NaOH to replace nitrate with hydroxide and remove potassium, three strips using 10mM H3BO3 to titrate the hydroxide and remove cesium from the solvent, and a final extraction of cesium from SRS-15 to determine the robustness of the system. The stability of the guanidine was critical to the stripping process as it suppresses the effects of competition anions that can not be removed by the strip solution. The results show that prolonged exposure to highly alkaline material, abnormal operating temperatures, and both at the same time decrease guanidine performance and reduces the efficiency of stripping cesium from the solvent.
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