Separation of toluene from non-aromatic hydrocarbons by extracti

Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound

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203 59, 203 60, 203 61, 203 62, 203 64, 203 65, 203 67, 585866, B01D 340

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043637043

ABSTRACT:
Toluene is virtually impossible to separate from similar boiling non-aromatic hydrocarbons by conventional rectification or distillation. Toluene can be readily separated from similar boiling non-aromatic hydrocarbons by using extractive distillation in which the extractive agent is a mixture of phthalic anhydride and/or maleic anhydride plus a suitable solvent. A typical mixture comprises phthalic anhydride, maleic anhydride and glycerol triacetate.

REFERENCES:
patent: 2431655 (1947-11-01), Amos et al.
patent: 2655467 (1953-10-01), Cooper et al.
patent: 3114783 (1963-12-01), Butler et al.

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