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

1987-03-10

1988-04-19

Bascomb, Wilbur

Distillation: processes, separatory

Adding material to distilland except water or steam per se

At least two materials

203 56, 203 57, 203 60, 203 61, 203 64, 203 65, 585805, 585866, B01D 340, C07C 708

Patent

active

047387556

ABSTRACT:
m-Xylene is difficult to separate from o-xylene by conventional rectification or distillation 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 ethyl-2-hydroxybenzoate; methyl benzoate plus benzophenone; methyl benzoate, butyl benzoate and dimethylsulfoxide.

REFERENCES:
patent: 2494274 (1950-01-01), Woerner
patent: 2721170 (1955-10-01), Johnson
patent: 2763604 (1956-09-01), Dorsey et al.
patent: 3116224 (1963-12-01), Bailey
patent: 4488937 (1984-12-01), Berg et al.

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