Separation of m-xylene from o-xylene by extractive distillation

Details Separation of m-xylene from o-xylene by extractive distillation Separation of m-xylene from o-xylene by extractive distillation

1986-04-21

1987-06-30

Bascomb, Wilbur

Distillation: apparatus

Apparatus

Systems

203 56, 203 57, 203 60, 203 63, 203 64, 203 65, B01D 340, C07C 708

Patent

active

046768726

ABSTRACT:
m-Xylene is difficult to separate from o-xylene by conventional distillation or rectification because of the close proximity of their boiling points. m-Xylene can be readily separated from o-xylene by using extractive distillation in which the extractive agent is adiponitrile or a mixture of it with certain high boiling organic compounds. Typical examples of effective agents are: adiponitrile; adiponitrile and 1,4-butanediol; adiponitrile, ethylene carbonate and benzyl alcohol.

REFERENCES:
patent: 2763604 (1956-09-01), Dorsey et al.
patent: 3116224 (1963-12-01), Bailey
patent: 4292142 (1981-09-01), Berg
patent: 4488937 (1984-12-01), Berg et al.

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