Separation of nitrobenzaldehyde isomers

Details Separation of nitrobenzaldehyde isomers Separation of nitrobenzaldehyde isomers

1986-05-12

1987-12-22

Lone, Werren B.

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

Organic compounds

Oxygen containing

568438, C07C 7606

Patent

active

047147830

ABSTRACT:
A process for separating ortho- or meta-nitrobenzaldehyde from a feed mixture comprising ortho-nitrobenzaldehyde or metal-nitrobenzaldehyde and at least one other isomer from which the ortho- or metal-isomer is to be separated. The feed mixture is contacted at adsorption conditions with meta-selective adsorbent comprising a type X zeolite having sodium or lithium cations at exchangeable cationic sites or with an ortho-selective adsorbent comprising a type Y zeolite having alkali metal or alkaline earth metal cations at exchangeable cationic sites or a phosphate-substituted crystalline, aluminum silicate zeolite. Preferred desorbents are lower alkyl acetates and formates, acetonitrile and benzaldehyde.

REFERENCES:
patent: 2985589 (1961-05-01), Broughton et al.
patent: 3706812 (1972-12-01), Derosset et al.
patent: 4310440 (1982-01-01), Wilson et al.
patent: 4402832 (1983-09-01), Gerhold
patent: 4450297 (1984-05-01), Preiss et al.
Davey and Gwilt, J. Chem. Soc. 1950, 208.
"Continuous Adsorptive Processing--A New Separation Technique" by D. B. Broughton presented at the 34th Annual Meeting of the Society of Chemical Engineers at Tokyo, Japan on Apr. 2, 1969.
Abstract of Mourey et al., Anal. Chem., 51(6), 763-7 (1979).
Abstract of Pastuska et al., Chemiker Ztg. 88(9), 311-14 (1964).

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