Process for the separation of isomers of chloronitrobenzene

Details Process for the separation of isomers of chloronitrobenzene Process for the separation of isomers of chloronitrobenzene

1979-04-16

1980-11-18

Sebastian, Leland A.

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

Organic compounds

Oxygen containing

210670, C07C 7912

Patent

active

042345200

ABSTRACT:
An adsorptive separation process for separating the ortho, meta and para isomers of chloronitrobenzene from a feed mixture comprising said isomers, which process comprises contacting the feed mixture in a first adsorption stage with a certain selected adsorbent, selectively adsorbing therein substantially all of the ortho-chloronitrobenzene to the substantial exclusion of the other isomers and thereafter recovering high-purity orthochloronitrobenzene, passing the unadsorbed isomers to a second adsorption stage where they are contacted with another selected adsorbent, selectively adsorbing therein substantially all of one of the isomers and thereafter recovering in high purity that isomer as well as the isomer unadsorbed in the second stage. A desorption step may be used to desorb the adsorbed isomers in each stage.

REFERENCES:
patent: 2985589 (1961-05-01), Broughton et al.
patent: 3558732 (1971-01-01), Neuzil
patent: 3840610 (1974-10-01), Hedge
De Rossef et al., "Separation of Pinene Isomers", Chem. Abstracts, vol. 82 (1975) 73245m.
Chmielowiec et al., "Usefulness of Ion Exchange Resins . . . ", Chem. Abstracts. vol. 85 (1976) 85:136947h.
Suzuki et al., "Separation of Cresol Isomers", Chem. Abstracts, vol. 85 (1976), 85:77876c.

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