Purification of meta-chloronitrobenzene

Details Purification of meta-chloronitrobenzene Purification of meta-chloronitrobenzene

1978-12-04

1980-09-30

Sebastian, Leland A.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

260705, 260707, C07C 7912

Patent

active

042255180

ABSTRACT:
This invention relates to the treatment of an isomeric mixture of chloronitrobenzenes to provide a product higher in meta-chloronitrobenzene content, and lower in ortho-chloronitrobenzene and para-chloronitrobenzene content. In particular, a liquid mixtuure of ortho-, meta-, and para-chloronitrobenzene isomers containing a major amount of the meta isomer is solidified by dispersing the isomeric mixture in a partially miscible solvent at temperatures below the melting point of meta-chloronitrobenzene, the solvent and its temperature being selected so that the chloronitrobenzene isomers are sparingly soluble in the solvent. More particularly, a liquid isomeric mixture of ortho-, meta- and para-chloronitrobenzene containing a major amount of meta-chloronitrobenzene is dispersed in a lower alkylene glycol solvent that is at a temperature below the melting point of meta-chloronitrobenzene. A finely divided solid is collected, for example, by filtration, to provide a product enriched in meta-chloronitrobenzene.

REFERENCES:
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patent: 2795620 (1957-06-01), Bloom et al.
patent: 2795621 (1957-06-01), Bloom et al.
patent: 3051650 (1962-08-01), Pfennig
patent: 3311666 (1967-03-01), Dunn
patent: 3816551 (1974-06-01), Lee
patent: 4102753 (1978-07-01), Stephenson
Kryuger et al., vol. 28, p. 1593 (1934).
Urbanski, Chemistry and Technology of Explosives, vol. 1, The MacMillan Co., New York, 1964, pp. 456 to 458.

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