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Suzuki, Hideya; Sasaki, Yuji; Tsubata, Yasuhiro; Shibata, Mitsunobu; Kurosawa, Tatsuya; Kawasaki, Tomohiro; Sagawa, Hiroshi; Matsumura, Tatsuro
no journal, ,
Hexaalkyl-nitrilotriacetamide (NTAamide) was evaluated for the separation of MA(III) and RE(III). NTAamide is a multidentate ligand comprising one soft N-donor atom and three hard O-donor atoms as part of its central frame. This tetradentate set of donor atoms provide selective binding for Am(III) and Nd(III) and yield separation factors of up to 3.7. A continuous liquid liquid extraction and stripping process were performed using Hexaoctyl-NTAamide (HONTA) in n-dodecane as the extractant in a multistage countercurrent mixer-settler extractor. Separation of MA(III) and RE(III) in high yield was demonstrated.
Suzuki, Hideya; Tsubata, Yasuhiro; Matsumura, Tatsuro
no journal, ,
The Japan Atomic Energy Agency has been studying partitioning and transmutation systems. In this partitioning process, new extractants with highly practical and high extraction ability for minor actinoids was developed. New extractants, called NTAamide, were tested for mutual separation of trivalent minor actinoids and trivalent rare earth elements. Among the four NTAamides, hexaoctylnitrilotriacetamide (HONTA) provided the largest distribution ratio of trivalent americium, and was chosen. A continuous liquid-liquid extraction test was conducted using a multistage countercurrent mixer-settler extractor with HONTA. In this test, separation of MA(III) and RE(III) was achieved with very high yield.
Suzuki, Hideya*; Shimojo, Kojiro; Emori, Tatsuya; Tsutsui, Nao; Kurosawa, Tatsuya*; Shibata, Mitsunobu*; Kawasaki, Tomohiro*; Ban, Yasutoshi
no journal, ,
The Japan Atomic Energy Agency (JAEA) has been studying partitioning and transmutation (P&T) systems. In P&T, JAEA proposed a novel hydrometallurgical process called "SELECT (Solvent Extraction from Liquid waste using Extractants of CHON-type for Transmutation) process". In the process, the separation of minor actinide (MA) from the chemically similar Rare earth elements (RE) is the key step. New acidic amide-type extractants, called TONAADA (Tetraoctyl nitriloacetic acid diacetamide) have been developed by JAEA. In this study, solvent extraction tests were performed using TONAADA, THNAADA (hexyl-type), and B-TONAADA (branched side chain type). As a result, the separation of MA from the nitric acid solution was achieved with high separation factor.