Isotopenaustausch-Untersuchungen an Silicat-Ionenaustauschern

Open Access
Publisher Website
Google Scholar
Abstract
A method has been developed to measure the rate of rapid heterogeneous ion exchange reactions between powdered solids and an aqueous solution within the temperature range from 100 to 180 °C. The principle of this method is the following: Both the preheated solid and the preheated aqueous solution are brought into contact by breaking a container. After an exchange period of ≧ 10 sec the process is interrupted within a time intervall of 0.2 sec by splashing cold alkohol ( — 115 °C) into the reaction vessel. By means of this “temperature-jump”-method the isotopic exchange in Ba-zeolite A has been investigated. The diffusion process was found to be not uniform at temperatures up to 100 °C just as already had been shown for Cs difussion in Zeolith A. Above 100 °C, however, it appears to become an ideal diffusion process exactly obeying the solution of the diffusion-equation for the relevant case over the entire range of the process.

This publication has 0 references indexed in Scilit: