Review

  • Journal of Nuclear Fuel Cycle and Waste Technology
  • Volume 1(1); 2003
  • Article

Journal of Nuclear Fuel Cycle and Waste Technology 2003;1(1):65-72. Published online: Mar, 30, 2003

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Removal Efficiency of Organic Iodide on Silver Ion-Exchanged Yeolite and TEDA-AC at High Temperature Process

  • Byung-Seon Choi ; Geun-Il Park ; Seong-Hoon Kim ; Juhyeon Yoon ; Yoon-Yeong Bae ; Sung_Kyun Zee ; Ho-Yeon Yang ; Seung-Kon Ryu
Abstract

Adsorption and desorption characteristics of methyl iodide at high temperature conditions up to 250℃ by TEDA-impregnated activated carbon and silver-ion exchanged zeolite(AgX-10), which are used for radioiodine retention in nuclear facility, were experimentally evaluated. In the range of temperature from 30℃ to 250℃, the adsorption capacity of base activated carbon decreased sharply with increasing temperature but that of TEDA-impregnated activated carbon showed higher value even at high temperature ranges. Especially, the residual amount of methyl iodide after desorption on TEDA-AC represented 30% lower value than that on AgX-10. However, it can be used as an adsorbent for the removal of methyl iodide up to 150℃ if it is preventing explosion by ignition. The breakthrough curves of methyl iodide in the fixed bed packed with AgX-10 up to 400℃ were compared upon the effects of bed temperatures, bed depth and input concentration of methyl iodide. Removal mechanism of methyl iodide on AgX-10 was proposed, based on the analysis of by-product gas generated from adsorption reaction.

Keywords

methyl iodide,zeolite,activated carbon,AgX,TEDA-AC,adsorption,desorption