Maomi Seko

Uranium isotope enrichment by chemical method

Through basic research on the separation of uranium isotopes by the isotopic equilibrium reaction of uranus and uranyl ions, a novel redox chromatography in adsorption columns has been discovered, which is most efficient for the enrichment of /sup 235/U. Further studies of kinetics and multicomplexes have led to the formation of two very important equations that satisfactorily predict the degree of separation of uranium isotopes. Some results from extensive single- and multicolumn experiments and a model plant currently under design for recovery of 3% enriched uranium are also described. 8 refs.

Separation of Uranium Isotopes by the Chemical Exchange Method

Abstract The basic chemical process and technology for producing 3-5% enriched uranium has been established, through advances which allowed increases in the electron-exchange and adsorption-desorption reaction rates, effective uranium adsorption band formation and maintenance, reduction of the mobile-phase dispersion, and reduction in the height of the separation unit, which is largely determined by the diffusion coefficient, the electron exchange reaction rate of uranium ions, and the non-uniform flow pattern in the adsorption band. Physical theory and experimental results show the attainment of a specific separation power of approximately 500 SWU/m3·yr for the process, and the possibility of an enrichment cost of

Electrolysis Cell Design For Ion Exchange Membrane Chlor-Alkali Process

41/SWU in its commercial-scale application as calculated with depreciation terms of 15 years for equipment and 45 years for buildings and interest payments at 8% on investment capital. Inherent advantages of the process, in addition to low enrichment cost, are simple, stable operation and faci...

Fluorinated ion exchange membrane as diaphragm for electrolysis.

Asahi Chemical began the world’s first commercial operation of the ion exchange membrane chlor-alkali process in 1975 (1,2) and has with continuous development and improvement since then expanded its technology to establish a complete range of equipment and processes, including the manufacture of membranes, cells, anodes, activated cathodes, and heat recovery evaporators (3–6). It has recently begun independent sale of the ion exchange membrane, in addition to the sale of its ion exchange membrane process.

Cation exchange membrane and use thereof in the electrolysis of sodium chloride

フッ素化アルカンスルポニルクロリドを還元すると反応条件によりフッ素化アルカンスルフイン酸ないしフッ素化アル力ンカルボン酸に転化する。モノマーとポリマーでは反応の選択性が大きく異なり,モノマーでは選択性が低いがポリマーではきわめて大きな選択性を有する。ポリマーにおける反応の選択性の高さは反応部位の立体規則性や反応の場としての環境,たとえば濃度比や反応生成物の反応への関与などがモノマー反応と大きく異なることによると思われる。この反応を利用すれば,電流効率が高く電解電圧の低い食塩電解用の陽イオン交換膜としてスルホン酸基とカルボン酸基を有する二層構造の膜の作成が可能である。カルボン酸の層の厚みにより電解性能は変化し,該厚みの増加は電流効率の増大,電解電圧の増大,透水量の低減をもたらす。実用性能上,カルボン酸の厚みは7μ以上あればよく電解諸性能を勘案してカルボン酸の厚みを最適化する必要がある。