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http://dx.doi.org/10.14478/ace.2022.1008

Indole Crystallization in Coal Tar Absorption Oil using Methanol Solvent Extraction  

Ryu, Heeyong (Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology)
Lee, Sangheon (Department of Chemical and Biomolecular Engineering, Seoul National University of Science and Technology)
Shin, Sungsoon (Omega Energy Environmental Technology Co. Ltd.)
Publication Information
Applied Chemistry for Engineering / v.33, no.2, 2022 , pp. 166-172 More about this Journal
Abstract
A method of efficiently purifying high value-added indole among components of coal tar absorption oil was studied using a step-by-step process of extraction-distillation-crystallization. The coal tar absorption oil used in this study contains 1.2% naphthalene, 0.1% quinoline, 0.4% isoquinoline, 6.4% indole, 21.0% 1-methylnaphthalene, 48.8% 2-methylnaphthalene, and 11.7% biphenyl as main components. For the separation and purification of indole, methanol was first used as a solvent to separate indole species in the coal tar absorption oil into an extract phase. And then methanol was recovered by distillation. Subsequently, an extraction solution where methanol was removed was mixed with normal hexane, and then crystallized to recover indole having a purity of 99.3%. Based on the experiments of this study, a purification process scheme for indole in coal tar absorption oil was proposed.
Keywords
Coal tar absorption oil; Indole; High-purity purification; Extraction; Crystallization;
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