Production of methylnaphthalenes and tar bases including indole

Details Production of methylnaphthalenes and tar bases including indole Production of methylnaphthalenes and tar bases including indole

C - Chemistry, Metallurgy

07

C

202/93, 260/281.

C07C 15/24 (2006.01) C07D 209/06 (2006.01) C07D 215/06 (2006.01) C10C 1/18 (2006.01)

Patent

CA 1173040

ABSTRACT Methylnaphthalenes, indole and other tar bases are recovered from a base-extracted coal tar distillation fraction. In one form, an aqueous salt solution of pH 0.5-3 extracts other tar bases from the starting material, and thereafter both products are recovered from the raffinate by several alternate methods including ethylene glycol extraction and extractive distillation. In other forms, the starting material is extracted with ethylene glycol and the extract is distilled to recover several products including indole. The raffinate of ethylene glycol extraction contains methylnaphthalenes and other hydrocarbons and can be purified to solvent-grade material.

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