Method for preparing high-abundance carbon-13 isotopes using carbon tetrafluoride as a medium

Abstract

The invention discloses a method for preparing high-abundance carbon-13 isotope by taking carbon tetrafluoride as a medium. The method comprises the following steps: taking gaseous carbon tetrafluoride as working medium to be introduced into a gas centrifuge, adopting a gas centrifugation method to carry out stand-alone centrifugal separation on the carbon tetrafluoride to obtain a concentrated / diluted carbon isotope; forming a first centrifugation cascade A by connecting a plurality of gas centrifuges in series and parallel, supplying the first centrifugation cascade A with carbon tetrafluoride raw materials of which the carbon-13 isotope abundance is about 30%, and obtaining the carbon tetrafluoride of which the carbon-13 isotope abundance is higher than 80% on the heavy fraction end ofthe first centrifugation cascade A; forming a second centrifugation cascade B by connecting the plurality of gas centrifuges in series and parallel, supplying the second centrifugation cascade B withthe carbon tetrafluoride raw material, which is obtained by the first centrifugation cascade A, of which the carbon-13 isotope abundance is higher than 80%, and obtaining the carbon tetrafluoride of which the carbon-13 isotope abundance is higher than 99% on the heavy fraction end of the second centrifugation cascade B. The method has the advantages of low energy consumption and large separation coefficient, and the effective proportion of the carbon-13 isotope a in the separation medium is high.

Description

technical field [0001] The invention belongs to the technical field of isotope separation, in particular to a carbon tetrafluoride (chemical formula CF 4 ) as a medium for the preparation of high-abundance carbon-13 isotopes. Background technique [0002] Carbon is an essential element in organic compounds and constitutes the carbon cycle of the biosphere. Its stable isotope has a wide range of applications and considerable potential demand capacity in the fields of medical diagnosis, agricultural ecology, and food safety. The main application of carbon stable isotopes is carbon-13 isotope-labeled compounds. Since carbon-13 isotopes do not have any radioactivity, they have unique advantages in today's era when living standards and safety awareness are greatly improved. Taking the diagnosis of Helicobacter pylori, the research object of the 2005 Nobel Prize in Physiology or Medicine, as an example, the diagnostic agent labeled with high-abundance carbon-13 isotope (>99%) ...

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Problems solved by technology

In addition, Japan has publicly produced carbon-13 isotopes by irradiating laser light on a fluorocarbon gas, which is still only in the laboratory stage and cannot be applied to industrial production.

The above technologies are all monopolized by relevant countries, and my country still does not have the mature technology for industrial production of high-abundance carbon-13 isotopes

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