Influence of Framework Silica-to-Alumina Ratio on the Tritiated Water Adsorption and Desorption Characteristics of NaX and NaY Zeolites
Influence of Framework Silica-to-Alumina Ratio on the Tritiated Water Adsorption and Desorption Characteristics of NaX and NaY Zeolites
复制标题
骨架硅铝比对NaX、NaY沸石氚水吸附和解吸特性的影响
DOI：
10.1080/18811248.2008.9711877
复制
发表时间：
2008
影响因子：
1.2
通讯作者：
T. Yamanishi
中科院分区：
文献类型：
--
作者：
Y. Iwai;T. Yamanishi
固定床吸附法是核聚变领域回收氚化水的一种很有前途的方法。以NaX和NaY分子筛为研究对象，系统研究了骨架SiO_2/Al_2O_3比在2.0 ~ 10.0范围内对H_2 O-HTO二元体系中氚水吸附和脱附特性的影响。通过改变SiO2/Al 2 O3比从7.0到10.0观察到等温线的大的差异。骨架SiO2-Al 2 O3的比例对同位素分离因子有轻微的影响。室温下NaY 10.0的可除去水的容量大约是NaA 2.0的四倍，即使两种沸石在接近P=P0= 1：0时具有几乎相同的可吸收H2O的容量。较弱的相互作用对解吸产生同位素效应。HTO脱水率与累积弛放气量有很强的相关性。脱水与吹扫气体的流速无关。在具有多吸收器系统的水吸附工艺的设计方面，水吸收器如干燥器或除湿器的尺寸可以用NaY10.0作为吸附剂按比例缩小，因为在NaY10.0塔中不需要考虑变温解吸工艺所需的加热和冷却时间。
The fixed-bed adsorption process has been studied as one of the promising processes for the recovery of tritiated water in the field of nuclear fusion. The influence of the framework SiO2/Al2O3 ratio ranging from 2.0 to 10.0 on the tritiated water adsorption and desorption characteristics in the H2O-HTO binary systems was systematically examined using NaX and NaY zeolites. A large difference in isotherm was observed by changing the SiO2/Al2O3 ratio from 7.0to 10.0. The framework SiO2-to-Al2O3 ratio has a slight effect on the isotope separation factor. The capacity of removable water from NaY10.0 around room temperature is approximately four times larger than that from NaA2.0 even though both zeolites have nearly the same capacity for absorbable H2O at nearly P=P0= 1:0. The weaker interaction generates the isotope effect on desorption. The HTO dehydration ratio has a strong interrelation with the accumulative amount of purge gas. Dehydration is independent of the flow rate of the purge gas. On the design side of the water adsorption process with multi-absorber systems, the size of the water absorber such as a dryer or dehumidifier can be downscaled with NaY10.0 as the adsorbent since the consideration of the heating and cooling periods necessary for the temperature swing desorption process is not required in the NaY10.0 column.