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

1987-06-16

Bascomb, Wilbur

Distillation: processes, separatory

Adding material to distilland except water or steam per se

At least two materials

203 57, 203 60, 203 61, 203 65, 203 67, 585805, 585864, B01D 340, C07C 708

Patent

active

046734651

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 a mixture polychloro aromatic compounds. Typical examples of effective agents are 2,3,4,6-tetrachlorophenol and p-dichlorobenzene; dimethyltetrachloroterephthalate, 2,3,4,6-tetrachlorophenol and 1,2,4,5-tetrachlorobenzene; 2,4,5-trichlorophenol, benzene hexachloride, o-dichlorobenzene and dioctyl phthalate.

REFERENCES:
patent: 2582197 (1952-01-01), Egan
patent: 2721170 (1955-10-01), Johnson
patent: 3105017 (1963-09-01), Amir et al.
patent: 4299668 (1981-11-01), Berg
patent: 4488937 (1984-12-01), Berg et al.

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