Abstract
In previous papers, the relation between the decontamination factor and the boiling condition in evaporation was discussed. For industrial use, however, the apparent decontamination factor by evaporation has been considered more important than the actual decontamination factor.In this paper, the actual and the apparent decontamination factors are given by Eqs. 1 and 2, respectively. The relation between the actual and the apparent decontamination factors by various evaporation processes has been studied, too. The equations obtained are as follows:-I. Single stage evaporation (Cf. Fig. 1)II. Multi-stage evaporation (Cf. Figs. 5 and 7)Comparison of various operations in a single evaporator is given in Table 1. In an extreme case, it is found that the exponent of the apparent decontamination factor is reduced by nearly 2.
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