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Separation and Recovery of Indole from Model Coal Tar Fraction by Batch Cocurrent 5 Stages Equilibrium Extraction  

Kim, Su Jin (Department of Materials Science and Applied Chemistry, Chungwoon University)
Chun, Yong Jin (Department of Materials Science and Applied Chemistry, Chungwoon University)
Jeong, Hwa Jin (Department of Fashion & Textile Engineering, Chungwoon University)
Publication Information
Applied Chemistry for Engineering / v.18, no.2, 2007 , pp. 168-172 More about this Journal
Abstract
The separation of indole from a model mixture comprising four kinds of nitrogen heterocyclic compounds [indole (In), quinoline (Q), iso-quinoline (iQ), quinaldine (Qu)], three kinds of bicyclic aromatic compounds [1-methylnaphthalene (1MN), 2-methylnaphthalene (2MN), dimethylnaphthalene (DMN)], biphenyl (Bp) and phenyl ether (Pe) was examined by batch cocurrent 4 stages equilibrium extraction. The model mixture used as a raw material in this work was prepared according to the components and compositions contained in coal tar fraction (the temperature ranges of fraction: $240{\sim}265^{\circ}C$). An aqueous solution of formamide was used as a solvent. Indole was recovered more than 99% through 4 stages of the equilibrium extraction. The range of selectivity of indole in reference to DMN obtained through the 5 stages equilibrium extraction was found to be 63~118. The process for separation and recovery of indole contained in coal tar was studied by using the experimental results obtained from this work and the previous work.
Keywords
coal tar; nitrogen heterocyclic compounds; indole; solvent extraction; batch cocurrent multistage equilibrium extraction;
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