Producing carbon-14 isotope from spent resin waste

Details Producing carbon-14 isotope from spent resin waste Producing carbon-14 isotope from spent resin waste

C - Chemistry, Metallurgy

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C01B 31/20 (2006.01) B01D 3/32 (2006.01) C01F 11/18 (2006.01) F25J 1/00 (2006.01) F25J 1/02 (2006.01) F25J 3/02 (2006.01) G21F 9/02 (2006.01)

Patent

CA 2061307

A method for the recovery of carbon-14 (C-14) from a mixture of inert gas and carbon-12 (C-12), carbon-13 (C-13) and C-14 dioxides. The mixture is cooled to a temperature below the solidification point of carbon dioxide to obtain solid carbon dioxide. The solid carbon dioxide is volatilised to provide substantially pure carbon dioxide gas which is reduced to carbon monoxide gas by reaction with metal. The carbon monoxide gas is cooled to obtain liquefied carbon monoxide. A feed of the liquefied carbon monoxide is subjected to fractional distillation and a bottoms rich in C-14 monoxide and poor in C-12 monoxide is collected and a distillate poor in C-14 monoxide and rich in C-12 monoxide is removed. The bottoms are oxidized to carbon dioxide rich in C-14 dioxide which is absorbed in a metal hydroxide solution and a carbonate salt rich in C-14 is obtained.

Une méthode pour recouvrer le carbone-14 (C-14) d'un mélange de gaz inertes et de carbone-12 (C-12), de carbone-13 (C-13) et de dioxydes C-14. Le mélange est refroidi jusqu'à ce qu'il atteigne une température en deçà du point de solidification du dioxyde de carbone, permettant d'obtenir du dioxyde de carbone solide. Le dioxyde de carbone solide est volatilisé pour fournir un gaz de dioxyde de carbone très pur qui est réduit à un gaz monoxyde de carbone en réaction avec le métal. Le gaz de monoxyde de carbone est refroidi pour donner du monoxyde de carbone liquéfié. Une portion du monoxyde de carbone liquéfié est soumis à une distillation fractionnelle et un sédiment riche en monoxyde C-14 et pauvre en monoxyde C-12 est recueilli et un distillat pauvre en monoxyde C-14 et riche en monoxyde C-12 est enlevé. Les sédiments sont oxydés pour former du dioxyde qui est absorbé dans une solution d'hydroxyde de métal et on obtient un sel carbonaté riche en C-14.

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