Separation of high purity indole from coal tar by high pressure crystallization

High pressure crystallization has been applied to the separation and purification of indole from a model mixture of crude coal tar. Indole with 98.6 wt% purity was separated at 50 °C under a pressure of 2000 kgf cm −2 from the model mixture contaning 69.3 wt% indole. Successive ‘depressurization swe...

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Bibliographic Details
Published in:Fuel (Guildford) 1991-04, Vol.70 (4), p.565-566
Main Authors: Yamamoto, Yoshitaka, Sato, Yoshiki, Ebina, Takeo, Yokoyama, Chiaki, Takahasi, Sinji, Mito, Yutaka, Tanabe, Harumasa, Nishiguchi, Nobuhiko, Nagaoka, Kohichi
Format: Article
Language:English
Subjects:
coal tar
crystallization
separation
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Summary:High pressure crystallization has been applied to the separation and purification of indole from a model mixture of crude coal tar. Indole with 98.6 wt% purity was separated at 50 °C under a pressure of 2000 kgf cm −2 from the model mixture contaning 69.3 wt% indole. Successive ‘depressurization sweating’ increased the purity of indole up to 99.5 wt%. The equilibrium of the system under high pressure was also studied.
ISSN:0016-2361
1873-7153
DOI:10.1016/0016-2361(91)90039-D