Abstract
Abstract The nitrogen isotope exchange system for 15N-fractionation consisting of liquid mixtures of N2O3 and N2O4 and the vapor phase in equilibrium with the liquid (NO/N2O3 system) has been studied at temperatures between −9 and 20°C under various pressures below 4 atm. A countercurrent isotope exchange apparatus and an associated product refluxer system are described. At 15°C the effective separation factor, αeff, increases from 1.006 at 1 atm to 1.030 at 2.7 atm and levels off thereafter. The observed αeff values are in good agreement with recent spectroscopic data. The height equivalent of theoretical plate (HETP) correlates well with the linear flow rate of gas phase, showing a dominant diffusion-control of the overall exchange rate. At 15°C the HETP of the NO/N2O3 system under 3∼4 atm can be smaller by factors of 7 to 10 than that of the Nitrox (NO/HNO3 exchange) system having the same product rate, rendering the former system a possibility for significantly smaller plant volume.
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