Extraction Chromatography Experiments on Repeated Operation using Engineering Scale Column System

The extraction chromatography separation experiments with the engineering scale column were carried out on a simulated waste solution. Ten times repeated separation experiments with two steps flow sheet using the CMPO/SiO2-P and the HDEHP/SiO2-P adsorbents provided durability of the adsorbents. The chromatograms obtained from the CMPO/SiO2-P column showed reproduced profiles through the multi-cycle operations. On the other hand, the time of development and peak shapes of the representative elements for HDEHP/SiO2-P column became slower and broader with the number of repeating the procedure due to leaching of HDEHP from the adsorbents.