Advanced TALSPEAK Separations Using a Malonate Buffer System

Autor:	Joseph L. Lapka, Kenneth L. Nash
Rok vydání:	2015
Předmět:	chemistry.chemical_classification Aqueous solution Ion exchange General Chemical Engineering Carboxylic acid Extraction (chemistry) Inorganic chemistry General Chemistry Malonic acid chemistry.chemical_compound Malonate chemistry Buffering agent Reagent Nuclear chemistry
Zdroj:	Solvent Extraction and Ion Exchange. 33:346-361
ISSN:	1532-2262 0736-6299
DOI:	10.1080/07366299.2015.1012878
Popis:	The extraction behavior of lanthanides and americium has been evaluated under Advanced TALSPEAK (Trivalent Actinide Lanthanide Separation by Phosphorus-reagent Extraction from Aqueous Komplexes) conditions using malonic acid as the aqueous buffering agent. The extractant 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (HEH[EHP]) was used as an organic phase liquid cation exchanger in n-dodecane diluent, while N-(hydroxyethyl)-ethylenediaminetriacetic acid (HEDTA) served as a selective aqueous holdback reagent. Extractions conducted from malonate media exhibit a pH profile that flattens as the concentration of malonate is increased up to 1.0 M malonate. This relatively flat extraction behavior from pH 2.5–4.0 is reminiscent of previous studies on Advanced TALSPEAK in lactate media. The extraction kinetics with other carboxylic acid buffers as well as the effects of varying HEDTA, HEH[EHP], and malonate concentration are compared.
Databáze:	OpenAIRE
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