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This chapter analyzes the hydrogen isotope separation by chemical isotope exchange method in gas-liquid systems. The two-temperature method is based on the temperature dependence of the separation factor. To improve the extraction degree, the columns of two-temperature plants must be provided with a depletion section. In this case, the feed flow can be delivered to a specific cross-section of column both of cold and of hot columns. It is found that while the cascading reduces capital and operation costs of separation—which are proportional to the columns' volume, the amount of changes in costs proportional to the flows depends on the design of the interstage flows. In the case of interconnection by both flows, the cascade aggregate flows remain identical to one of a single-stage plant, and the costs proportional to the flows do not increase. The extraction degree in separation by the two-temperature method, as well as by other methods, is determined by the ratio between the plant capacity and the amount of isotope arriving with feed flow. The additional flows resulting from the temperature influence on the gas solubility and on the pressure of saturated vapors of the liquid phase are also elaborated. |
