T h e behavior of hydrogen in liquid sodium containing relatively large amounts of oxygen were investigated with the aid of the hydrogen sensor of niobium membrane. T h e partial pressure of the hydrogen in liquid sodium a t hot zone of a cold-trapped natural circulation sodium loop w a s measured a s functions of temperatures of the cold t r a p and the hot zone of the loop. It was observed that a t constant cold trap temperature the partial pressure of hydrogen in sodium increases with increasing the hot zone temperature. T h i s study also showed that, keeping the temperature of hot zone constant, a logarithmic plot of hydrogen concentration calculated from the equilibrium hydrogen partial pressure us. t h e reciprocal temperature of cold trap yields a straight line whose slope is nearly equal to that on the solubility of sodium hydroxide in sodium. Finally, it was observed that the permeation of hydrogen in sodium through a niobium membrane i s a process controlled by diffusion. But the permeability for hydrogen in niobium is a few-hundredths smaller than that in literature, owing to the oxide film on the membrane surface.
Some fundamental studies for removing hydrogen from liquid sodium by a molten salt extraction were carried out. Alkali chloride eutectics LiCI-KCI and LiCI-KCI-NaCI (chlinak) were chosen because of their relatively low melting points, and the properties of these eutectics related to reactivities and mutual solubilities between the salts and liquid sodium were examined experimentally. From the comparison of the solubility of sodium in molten eutectics it was decided to employ chlinak for extracting hydrogen from sodium. T h e difference in hydrogen concentration in sodium before mixing of the two liquid phases and after equilibrium indicated that the molar distribution ratio of hydrogen between molten chlinak and sodium was more than 10 a t 400°C and decreased with increasing temperature. From these results, it w a s found that hydrogen was preferentially extracted into the molten salt phase, and deduced that molten salt extraction with molten chlinak was a feasible process for removing hydrogen from liquid sodium.
T h e behavior of hydrogen in liquid sodium containing relatively large amounts of oxygen were investigated with the aid of the hydrogen sensor of niobium membrane. T h e partial pressure of the hydrogen in liquid sodium a t hot zone of a cold-trapped natural circulation sodium loop w a s measured a s functions of temperatures of the cold t r a p and the hot zone of the loop. It was observed that a t constant cold trap temperature the partial pressure of hydrogen in sodium increases with increasing the hot zone temperature. T h i s study also showed that, keeping the temperature of hot zone constant, a logarithmic plot of hydrogen concentration calculated from the equilibrium hydrogen partial pressure us. t h e reciprocal temperature of cold trap yields a straight line whose slope is nearly equal to that on the solubility of sodium hydroxide in sodium. Finally, it was observed that the permeation of hydrogen in sodium through a niobium membrane i s a process controlled by diffusion. But the permeability for hydrogen in niobium is a few-hundredths smaller than that in literature, owing to the oxide film on the membrane surface.
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