FIELD: chemistry.
SUBSTANCE: method of producing water enriched in oxygen-18 from natural water by rectifying water in a vacuum includes water pre-enrichment in oxygen-18 in parallel columns operating in an open circuit with the selection of the first kind of intermediate oxygen concentrate-18 and the final enrichment of the intermediate concentrate in the cascade of columns, consisting of columns concentrating in oxygen-18 and exhausting in oxygen-16. At the same time, water circulating in the pre-enrichment columns is used to power the device, the natural oxygen content of 18 is maintained by chemical isotope exchange with carbon dioxide, which in turn maintains the natural content of oxygen-18 by chemical isotope exchange with natural water. The device for producing water enriched in oxygen-18 from natural water includes a preconcentration unit, which is designed in the form of parallel operation in an open circuit without exhaustion with the selection of the first kind of preconcentration rectification columns, a final concentration unit made in the form of oxygen concentrating-18 columns and oxygen-depleted-16 columns, and a preconcentration unit located on the supply line and consisting of columns of chemical isotope exchange in the system water - carbon dioxide.
EFFECT: producing water enriched in oxygen-18, with enrichment of 95 percent and normalized isotope composition by deuterium, with high efficiency and low level of technological losses.
2 cl, 2 dwg, 2 tbl
