| Summary: | For the purpose of determining the high-purity purification of indole (<i>IN</i>) contained in wash oil in concentrations of 5.75%, this study, first of all, investigated the concentration of <i>IN</i> contained in wash oil using a combination of methanol extraction to recover <i>IN</i> in the wash oil, and n-hexane re-extraction to concentrate <i>IN</i> present in the extract phase, recovered through methanol extraction. In order to examine the effect of each operation on the recovery and concentration of <i>IN</i> contained in the wash oil, batch 1-stage and batch co-current 5-stage distribution equilibrium was performed simultaneously. As 5-stage equilibrium extraction and re-extraction progressed, the recovery rate of <i>IN</i> decreased to about 79.1%, while <i>IN</i> composition in the raffinate phase recovered by re-extraction was highly concentrated to about 73.3%. From the high recovery rate and composition of <i>IN</i> obtained through this study, we confirmed that the combination examined by this study was one of the very useful combinations for the concentration of <i>IN</i> present in the wash oil. Furthermore, we reviewed the recovery and concentration process of <i>IN</i> contained in the wash oil using the experiment results of the extraction and the re-extraction obtained from this study.
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