Distillation: processes – separatory – Adding material to distilland except water or steam per se – Organic compound
Patent
1981-11-20
1982-12-14
Sever, Frank
Distillation: processes, separatory
Adding material to distilland except water or steam per se
Organic compound
203 59, 203 60, 203 61, 203 62, 203 64, 203 65, 203 67, 585866, B01D 340
Patent
active
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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