H-D体系的低温精馏分离实验研究

Separation of H-D mixtures by cryogenic distillation

在自制低温精馏氢同位素装置上进行了H-D分离的初步实验。结果表明,以D/H比为1.4×10-4的氢气为原料,进料流量5mol/h,运行120h后,再沸器的D/H比达1.27×10-2;增加原料气氘浓度,其浓集效果明显提高。随着再沸器中氘浓度增加,柱顶氘浓度增加,脱氘率降低。全回流实验下,再沸器加热功率增加,脱氘率增加,但造成柱压力明显增加。为控制精馏过程操作压力,选择适当的再沸器加热功率是必要的。

In this paper, separation of hydrogen-deuterium mixtures were performed on a cryogenic distillation apparatus. 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.