Separation of ethylbenzene from para- and meta-xylenes by extrac

Details Separation of ethylbenzene from para- and meta-xylenes by extrac Separation of ethylbenzene from para- and meta-xylenes by extrac

1981-01-12

1981-09-29

Sever, Frank

Distillation: processes, separatory

Adding material to distilland except water or steam per se

At least two materials

585805, F01D 340

Patent

active

042921422

ABSTRACT:
Ethylbenzene and para-xylene and/or meta-xylene are difficult to separate by distillation because they boil only 2.3 C..degree. and 3.1 C..degree. apart. Ethylbenzene can be readily separated from the xylenes by using extractive distillation in which the extractive distillation agent is a mixture of oxygen-containing organic compounds boiling higher than the xylenes. The mixture typically includes phthalic anhydride and maleic anhydride with or without a solvent.

REFERENCES:
patent: 2431655 (1947-11-01), Amos et al.
patent: 2945902 (1960-07-01), Romans

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