LPCE法同位素分离制备低氘水的工艺研究

Study on the Preparation of Depleted Deuterium Water by LPCE Isotope Separation

液相催化交换(LPCE)法是一种操作方便高效的氢同位素分离方法。本文对LPCE法同位素分离制备低氘水的工艺进行了深入的实验研究。通过研究发现,在液相催化交换方法(LPCE)生产低氘水过程中,如果气液比达到1.5,随着温度的递增,总体积传质的系数Kya值会先升高后降低。而当反应温度一旦超过60℃,这一系数会持续地下降,因此,60℃被认为是最佳的反应温度。此外,LPCE方法在制备低氘水时候,最优气液比会因交换反应温度的不同而有所变化。气液比的增大会导致总体积传质系数Kya值上升,但是过高的气液比可能会导致气液带动,可能进一步引发液泛,从而使交换反应效率反而下降。

The liquid phase catalytic exchange(LPCE)method is a convenient and efficient hydrogen isotope separation method.In this paper,an experimental study on the preparation of low deuterium water by LPCE isotope separation was carried out.The results show that when the gas-liquid ratio is 1.5,as the temperature increases,the total volume mass transfer coefficient Kya value of the LPCE process for preparing low deuterium water will first increase and then decrease.When the temperature is higher than 60℃,The total volume mass transfer coefficient Kya value gradually becomes smaller,and the optimal reaction temperature is 60℃.For different exchange reaction temperatures,there are different optimal gas-liquid ratios for the preparation of low deuterium water by the LPCE method.As the gas-liquid ratio increases,The larger the total volume mass transfer coefficient Kya value is,but an excessively large gas-liquid ratio will cause gas-liquid entrainment or even flooding,reducing the exchange reaction efficiency.