Production of high-enriched carbon-13 by two-stage laser method. (December 2020) - Laptev, V B
Abstract: A variant of a two-stage laser process for production highly enriched carbon-13 ( 13 C) with a concentration of more than 99% is being investigated. The first laser stage provides effective enrichment of 13 C up to 30-50% based on the isotopically selective multiphoton dissociation of freon-22 (CF2 HCl) by pulsed radiation of a CO2 laser. Then the product of the first stage tetrafluoroethylene, enriched in 13 C, is converted into the working substance of the second stage, freon-12B2 (CF2 Br2 ). At the second stage of enrichment, a component with an undesirable isotope 12 C undergoes to selective dissociation, until its concentration in the residual gas decreases to 1% and the concentration of the 13 C isotope is increased to 99%. In preliminary experiments, high parameters of the elementary act of separation were achieved - the dissociation yield of the 12 CF2 Br2 up to 20% and selectivity (for 12 C) up to 100. A productivity of the second enrichment stage for a reactor of ideal displacement is estimated, that is 0.6 and 1.2 g 13 C/h for initial concentrations of 13 CF2 Br2 30 and 50%, respectively.