Presentation Information
[2A14]Establishment of decomposition method for TANNIX adsorbent by hydrothermal reaction(2)Observation of decomposition behavior using neutron beams
*Kohei Ohmori1, Toshihiro Iwamoto1, Yoichi Arai1, Tomomasa Funakoshi1, Sou Watanabe1, Masahiro Nakamura1, Jun Abe2, Yoshihiro Matsumoto2, Kazuki Mita2, Masaru Watanabe3 (1. JAEA, 2. CROSS, 3. Tohoku Univ)
Keywords:
TANNIX,hydrothermal reactions,neutron imaging
As a result of basic testing, it was confirmed that about 74% by weight of TANNIX can be decomposed by heating at 523 K for 24 hours. However, information on decomposition behavior in response to temperature changes was not obtained. Therefore, an attempt was made to analyze the decomposition behavior using a neutron imaging device (Raden) that allows visual observation of the decomposition behavior inside the reaction vessel. The results confirmed that TANNIX was seen to diffuse into the water medium over 473K. In 3–5 minutes, it is believed that the TANNIX was dissolved, and decomposed. After reaching 473 K, the decomposition products of TANNIX were observed to be uniformly distributed throughout the reaction vessel. These results clarified that 473 K is required for the hydrothermal decomposition of TANNIX at least, and revealed that the decomposition reaction progresses through the generation of hydrolyzed products.