In this paper

separation of hydrogen-deuterium mixtures were performed on a cryogenic distillation ap-paratus. The results show that the D/H ratio in the reboiler reduced to 1.27×10-2 at 120h with a flow flux of 5mol/h of the gas mixture in D/H ratio of 1.4×10-4. The enrichment effect increased apparently with D/H ratio of the feeding gas. However

the deuterium content in the top of distillation column increased with the deuterium content in the reboiler

and the de-deuterium efficiencies decreased. In the full reflux experiment

the de-deuterium efficiency increased with heating power of the reboiler

and the inside pressure in the distillation column increased

too. It was necessary that suitable heating power should be chosen in order to control operation pressure in the cryogenic distillation process.