METHOD FOR PRODUCTION HIGH-CONCENTRATION 13C ISOTOPE (OPTIONS) Russian patent published in 2002 - IPC

FIELD: isotope production. SUBSTANCE: Freon-22/nitrogen mixture at (1-7):(3-5) ratio is irradiated by IR laser in interaction chamber, which is part of separation unit placed in the region of optical resonator of pulse-periodic CO₂ laser. Prepared mixture of Freon- 22, tetrafluoroethylene, and HCl is accumulated in adsorber at temperature between -70 and 0 C. Adsorber inlet is connected to bearing block outlet. Accumulation is continued until sorbent is saturated with tetrafluoroethylene, after which adsorber is disconnected from bearing block and evacuated by means of vacuum pump at accumulation temperature to remove the rest of nitrogen. Accumulated mix is desorbed by heating adsorbent to 50-100 C. A part of non-adsorbed gases is transferred into bearing block. Two or more adsorbers can be used alternatively. Adsorbents can be activated carbon, active alumina, alumogel, or zeolites. According to one embodiment of invention, desorbed mix is fried of HCl and then rectified. According to another option, tetrafluoroethylene and HCl are first separated from Freon- 22 and then tetrafluoroethylene is fried of HCl. Tetrafluoroethylene enriched by 10 to 40% with respect to 13C isotope after laser concentration step is oxidized into carbon dioxide, which is subjected to the second concentration step, for instance on gas centrifuges' chain. Resulting carbon dioxide more than 99,0% 13C isotope. EFFECT: reduced cost price of product. 8 cl, 2 dwg