Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Motokawa, Ryuhei; Kobayashi, Toru; Endo, Hitoshi; Mu, J.*; Williams, C. D.*; Masters, A. J.*; Antonio, M. R.*; Heller, W. T.*; Nagao, Michihiro*
ACS Central Science, 5(1), p.85 - 96, 2019/01
Times Cited Count：47 Percentile：86.08(Chemistry, Multidisciplinary)Mu, J.*; Motokawa, Ryuhei; Akutsu, Kazuhiro*; Nishitsuji, Shotaro*; Masters, A. J.*
Journal of Physical Chemistry B, 122(4), p.1439 - 1452, 2018/02
Times Cited Count：36 Percentile：72.75(Chemistry, Physical)Sogo, Yumi; Yamagishi, Isao; Kubota, Masumitsu
JAERI-Research 97-091, 24 Pages, 1997/12
JAERI-Research-97-091.pdf:0.67MB
no abstracts in English
Sogo, Yumi; Yamagishi, Isao; Kubota, Masumitsu
JAERI-Research 97-090, 16 Pages, 1997/12
JAERI-Research-97-090.pdf:0.6MB
no abstracts in English
; ; ; ; *
PNC TN8410 93-046, 46 Pages, 1993/03
The TRUEX process has been developed to recover transuranium elements from high level liquid waste. This process uses octyl(phenyl)-N,N-diisobutylcarbamoylmethylphosphine oxide (CMPO) which is able to extract tri-valent actinides. It is already well known that a third phase appears at the interface when rare earths and other metal ions are extracted from a concentrated solution into TRUEX solvent which consists of CMPO with TBP - dodecane mixture. The basic researches concerning behavior of third phase formation and elimination were done in previous experiments. Succseively, dependency of temperature on organic phase composition, behavior of U extraction, applicability to high level liquid waste and diluent effect were investigated in these experiments. Consequently, these results were made obviously. By composition analysis of solvent which extracted nitric acid, it was found that not only concentration of extracted species, but temperature also influences on the composition of split phase. Extraction of high uranium concentration caused yellow precipitation. Critical concentration for precipitation were constant in each system and not dependent on temperature significantly. This precipitation was considered to affect extraction procedure, so that the condition should be selected carefully. In experiment using simulated waste, it's found that with appropriate condition of TBP concentration and temperature, dilution of concentrated liquid waste would not be necessary. From this work, 1.4 M for TBP concentration and 40 
C are promisible and that are typical values for concentrated waste. However, to determine the practical conditon for real waste treatment, further experiments should be done. From comparison of hydrocarbon composed of 12 carbons with n-dodecane as diluent, carbon chain length and banching influence on critical concentration of third phase formation.
; Nomura, Kazunori; ; ; Kuno, Yusuke
PNC TN8410 92-172, 112 Pages, 1992/06
Basic distribution studies and counter-current flowsheet experiments employing a mixture of CMPO with TBP as a reference solvent were conducted to evaluate the applicability of the TRUEX process to high level liquid wastes(HLLW) generated from the PUREX reprocessing process. Real highly active raffinate (HAR) solutions were used for these experiments. Concerning the major nuclide components of HLLW, various effecting factors on D values such as acidity, temperature, the ratios of CMPO/TBP and components concentration were investigated, respectively. Earlier (the first and second) counter-current flowsheet runs with laboratory scale mixer-settlers have shown excellent capability of the TRUEX process for actinides separation from real HAR solution. However, these tests showed unexpected significant retention of ruthenium and plutonium in the solvent. In the successive third run, some improvements to increase separation factor of these two nuclides and neptunium were demonstrated. This annual report summarizes results derived from the counter-current runs and basic study that treat the distribution of Np (IV, V, VI), other actinides and fission products, and the solubilities of extracted complexes to clarify the third phase split conditions. The results from supporting study which will cover solvent degradation and cleanup, and innovating new extractant, etc. are also included.
; Shirahashi, Koichi; Morita, Yasuji; Kubota, Masumitsu
JAERI-M 90-178, 18 Pages, 1990/10
no abstracts in English
Morita, Yasuji; Kubota, Masumitsu
JAERI-M 89-139, 19 Pages, 1989/10
no abstracts in English
Motokawa, Ryuhei
no journal, ,
no abstracts in English
Motokawa, Ryuhei
no journal, ,
Motokawa, Ryuhei
no journal, ,
Motokawa, Ryuhei; Kobayashi, Toru; Endo, Hitoshi
no journal, ,
no abstracts in English
