Observation of Isotope Effect in Supercritical Fluid and Its Application to Isotope Separation Processes

超临界流体中同位素效应的观察及其在同位素分离过程中的应用

• 批准号: 13308026
• 负责人: YAMAMOTO Ichiro
• 金额: $ 18.97万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2001
• 资助国家: 日本
• 起止时间: 2001 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13308026/
• 关键词: supercritical fluid; isotopes; isotope separation; isotope effect; lithium; crown compounds; equilibrium separation factor; cryptand; 平衡分配係数

Applicability of supercritical carbon dioxide (SF-CO_2) was experimentally studied as an alternative for organic compound as mobile phases of chromatographic isotope separation. Lithium isotope separation was performed by a displacement chromatography with LiCl in methanol diluted by SFCO_2 in a breakthrough manner at 313 K and 10 MPa. As a stationary phase, commercially available cryptand (2s, 2, 1) polymer was employed to form a complex with LiCl and packed in a stainless steel column. Low solubility of LiCl in SF-CO_2 was dramatically improved by the addition of methanol ; the mixture of LiCl, methanol and SF-CO_2 formed a single phase and worked as a mobile phase under the given condition. LiCl was absorbed in a step wise at the front boundary, and, the equilibrium separation factor was evaluated to be 1.025. Use of SF-CO_2 enhanced effective capacity of the complexation of LiCl with cryptand polymer.

实验研究了超临界二氧化碳(SF-CO_2)作为有机化合物替代色谱同位素流动相的适用性。采用SFCO_2稀释的LiCl甲醇溶液在313 K、10 MPa条件下突破性地进行锂同位素分离。作为固定相，使用市售的穴状配体（2s,2,1）聚合物与LiCl形成络合物并填充在不锈钢柱中。甲醇的加入显着改善了LiCl在SF-CO_2中的低溶解度；在给定条件下，LiCl、甲醇和SF-CO_2的混合物形成单相并作为流动相。 LiCl在前边界处被逐步吸收，并且平衡分离因子被评估为1.025。 SF-CO_2的使用增强了LiCl与穴状配体聚合物络合的有效能力。

项目成果

渡辺武志, 榎田洋一, 山本一良: "クリプタンド(2B,2,1)樹脂を固定相として用いた置換クロマトグラフィーLi同位体分離における移動相の検討"日本原子力学会中部支部第33回研究発表会要旨集. 1. 27 (2001)

Takeshi Watanabe、Yoichi Enokida、Kazuyoshi Yamamoto：“使用穴状配体 (2B,2,1) 树脂作为固定相的置换色谱 Li 同位素分离中的流动相研究”第 33 次研究报告，日本原子能学会中部分会摘要 1。 27 (2001)

T.Watanabe, O.Tomioka, Y.Enokida, I.Yamamoto: "Effect of constituents on lithium isotope separation by supercritical fluid chromatography"Journal of Nuclear and Radiochemical Sciences. Suppl.3. 45 (2002)

T.Watanabe、O.Tomioka、Y.Enokida、I.Yamamoto：“成分对超临界流体色谱法锂同位素分离的影响”核与放射化学科学杂志。

H.Sugiyama, Y.Enokida, I.Yamamoto: "Nitrigen isotope separation with displacement chromatography using cryptand polymer"Journal of Nuclear Science and Technology. 39. 442-446 (2002)

H.Sugiyama、Y.Enokida、I.Yamamoto：“使用穴状配体聚合物通过置换色谱法分离氮同位素”核科学与技术杂志。

T.Watanabe, Y.Enokida, O.Tomioka, I.Yamamoto: "Use of Supercritical Carbon Dioxide for Chromatographic Separation of Lithium Isotopes"Proceedings of the 1st International Symposium on Supercritical Fluid Technology for Energy and Environment Applications.

T.Watanabe、Y.Enokida、O.Tomioka、I.Yamamoto：“使用超临界二氧化碳进行锂同位素色谱分离”第一届能源和环境应用超临界流体技术国际研讨会论文集。

Chien M.Wai: "Supercritical Fluid Extraction Technology for Nuclear Waste Management, Chapter 5.1 in Hazardous and Radioactive Waste Treatment Technologies Handbook"CRC Press. 20 (2001)

Chien M.Wai：“用于核废物管理的超临界流体萃取技术，《危险和放射性废物处理技术手册》第 5.1 章”CRC Press。