A study on the adsorption characteristics of filtering materials

A convenient procedure for preparing mono alkyl iodides of TEDA and piperazine was eatablished, and their reactivities with methyl iodide in presence of alcoholic solvent systems showed a high reactivity suitable to be used as an impregnant of the activated carbon for nuclear applications. Impregnated active carbons with these chemicals were examined to confirm their adsorption capacities with gaseous methyl iodide at both 30 deg C and 80 deg C, which could reveal efficient adsorption capacities in the range of the impregnation weight percentage of more than 2.0 and less than 4.0. Penetration ratio of these impregnated cabon samples with radio active methyl iodide could show the resembled results as above. Impregnated carbon samples did not deteriorate upon the prolonged exposure in a humid air flow (RH > 90 %) at 80 deg C and therefore they were feasible to be used as the carbon filter media of the ESP system of a nuclear power plant. Especially, ethyl iodide of TEDA could show the best performances. (author)