Separation of ortho-, meta- and para-tolunitrile from ternary mi

Details Separation of ortho-, meta- and para-tolunitrile from ternary mi Separation of ortho-, meta- and para-tolunitrile from ternary mi

1990-08-13

1991-03-26

Bascomb, Wilbur

Distillation: processes, separatory

With disparate physical separation

Utilizing removing solid from liquid

203 80, 558327, 558328, 558329, 558355, 558356, B01D 314, C07C25334

Patent

active

050026399

ABSTRACT:
A process for the separation of ortho-, meta- and para-tolunitrile from ternary mixtures of isomers entails removing ortho-tolunitrile from these mixtures by distillation under pressures of from 10.sup.2 and 10.sup.5 Pa and with a reflux ratio of from 1:1 to 200:1, and distilling the remaining binary mixture of meta- and para-tolunitrile to concentrate to more than 75 mol-% para-tolunitrile, and freezing out the paratolunitrile at below 26.degree. C., and a process for the preparation of suitable ternary mixtures of isomers entails isomerization of pure ortho-, meta- or para-tolunitrile or mixtures thereof at from 380.degree. to 580.degree. C. on zeolite catalysts.

REFERENCES:
patent: 1918997 (1933-07-01), Weiland
patent: 2499055 (1950-02-01), Cosby et al.
patent: 2783266 (1957-02-01), Toland
patent: 2838558 (1958-06-01), Hadley et al.
patent: 3362982 (1968-01-01), Oga et al.
patent: 3709979 (1973-01-01), Chu

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