M. "Ohta

M. Takami

T." Kawano

Y. Sakuma

National Institute for Fusion Science (NIFS-Repository)

Fig.2 Arrhenius plot of water adsorption.3.2---6, : 383o : 393o : 373... :363• : 353... : 343Temperature / K• : 32310382.8I2.6'\\0\\ 6.61kcatmor1\0\\\O.62kcatmor10----90----& -0... _I I20.80.60.4,.S0.2 I-0-0.22.44 6Time / hFigl. Isotherm of water adsorption using Vycor glass tubeexhausted with heating at 453K.investigated at various temperatures on theseparation cell used with the porous Vycor glasstube in which residual water was eliminated byheat treatment at 453K (Fig. 1). The maximumamount of water vapor adsorbed decreased and theinterval reaching the maximum value was shorterwith rising of adsorbing temperature. Theadsorption of water vapor at 323 -3 93K proceedsaccording to the formula of the first-order. Watervapor adsorbed hardly at 453K. These resultswere applied to Arrhenius' equation (Fig.2). Theactivation energy was estimated O.62kca1.mor 1and 6.6 kca1.mor 1 at J23-373K and at 373-393K,respectively. These facts suggest that theseparation cell operated at 453K is able to inhibitpermeation of HTO.0.4OJ)CCl-Q;I Q;I OJ00,.0Q;I"""l-< 0000 0.2l:l..... -.....,OJ)...c:l-<OJ) 00.1.....Q;I:;;.,s:>§ 11. Study on Separation of HydrogenIsotopes Using Vycor Glass Tube2. ExperimentalThe separation cell consists of the porousVycor glass tube (Corning Glass #7930, length:155mm, internal diameter: 7.6mm and thickness:1.2mm) and jacket tube (Pyrex glass). The porousVycor glass tube is set up in the center of jackettube (Pyrex glass) by using with silicon rubberand seal tapes. The micropore distribution andBET specific area of the porous Vycor glass tubewas of approximately 2nm of maximum value and220m2g-1 , respectively. The temperature inside ofthe porous Vycor glass tube was controlled at453K by used with nichrome wire heater and airflowing (0.7 L/min). The amount of water vaporadsorbed on the porous Vycor glass tube wasmeasured at various temperatures in air flowcontaining water vapor (Relative humidity: 60% at298K).3. Results and DiscussionThe adsorption of water vapor was1. IntroductionTritium compounds that is a fuel for nuclearfusion and is slightly produced at nuclear powergeneration contains main tritium gas (HT) andminor tritiated water vapor (HTO). Thedangerousness of HTO on human body is muchhigher than that of HT. Therefore, it is necessaryto separate tritium compounds to each chemicalform to maintain reasonably the safety andenvironment in a nuclear power plant. In thisstudy, the separation cell used with the porousVycor glass tube was proposed as the separationcell of tritium compounds. The adsorption ofwater vapor was investigated at varioustemperatures on the separation cell used with theporous Vycor glass tube in which residual waterwas eliminated by heat treatment at 453K.Ohta, M. (Niigata Univ. Eng.)Takami, M. (Niigata Univ. Graduate School Sci. Tech.)Sakuma, Y., Kawano, T.418

Study on Separation of Hydrogen Isotopes Using Vycor Glass Tube

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