| 摘要 |
FIELD: chemical industry; metallurgy industry; medical equipment; lighting engineering and nuclear physics; methods and the devices for the deep purification of xenon isotopes from the gaseous impurities. ^ SUBSTANCE: the invention is pertaining to the method and the device for the deep purification of xenon isotopes from the gaseous impurities. The invention may be used in chemical industry, metallurgy, in production of medical equipment, in lighting engineering and nuclear physics for determination of mass of a neutrino. The initial mixture of xenon isotopes with impurities is fed into one of the freezing devices 2 or 3 of the stage of the gaseous centrifuges 1 through one of the branch-pipes 19 or 20 at the open gate units 7, 8 or 9, 10. Isotopes of xenon and the part of the gaseous impurities are settling on the walls of the one of the freezing devices 2 or 3. The non-settled gaseous impurities having the pressure of the saturated steam exceeding the pressure of the isotopes of are removed by the vacuum system 6. Then terminate feeding of the initial mixture by closing gates 7, 8 on the branch-pipe 19 or gates 9, 10 on the branch-pipe 20. For keeping the process continuity the device contains of no less than two freezing devices 2 or 3, each of which is connected in parallel to the stage of the centrifuges 1 and in series - to the accumulating balloon 4 or 5, which is in advance frozen refrigerated in the Dewar flask 16. At first the freezing device 2 or 3 works in the mode of freezing, and then - in the mode of warming-up and taking the isotopes off. The modes switching is exercised by opening gates 8, 26 and 13 of the pipeline 24 or gates 10, 27 and 14 of the pipeline 25. The heating-up of the freezing device 2 or 3 up to the temperature of (-70°C)-(-80°C) is exercised by removing the Dewar flask 15 or 23. The withdrawal of the purified xenon isotopes is conducted at the residual pressure of(3-10).10-3 mmHg. Operation of the freezing device 2 or 3 with the accumulating balloon 4 or 5 in pairs is interleaved in the indicated modes of operation. The invention ensures a continuity of the process of deep purification of xenon isotopes from the various gaseous impurities, does not require the complex installations, allows to reduce expenditures. The contents of the gaseous impurities in the final product does not exceed 4.4 ppm. ^ EFFECT: the invention ensures a continuity of the process of deep purification of xenon isotopes from the various gaseous impurities, absence of the need in the complex installations, reduced expenditures. ^ 5 cl, 5 dwg, 1 tbl |
