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

  • Yamamoto Y
  • Sato Y
  • Ebina T
 et al. 
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Abstract

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-2from 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. © 1991.

Author-supplied keywords

  • coal tar
  • crystallization
  • separation

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Authors

  • Yoshitaka Yamamoto

  • Yoshiki Sato

  • Takeo Ebina

  • Chiaki Yokoyama

  • Sinji Takahasi

  • Yutaka Mito

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