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

1981-07-28

1982-09-14

Sever, Frank

Distillation: processes, separatory

With disparate physical separation

Utilizing liquid-liquid extracting of distillation product

203 46, 208 42, 208 45, 546353, G01D 314, G01D 1104

Patent

active

043494188

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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J. F. Weiler, "High Temperature Tar" in H. H. Lowry.
"Chemistry of Coal Utilization," pp. 621-625, esp. 625, (1963).

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