Adsorptive separation of nitrobenzaldehyde isomers.

摘要

Ortho- or meta-nitrobenzaldehyde can be separated from a feed mixture comprising ortho-nitrobenzaldehyde or meta-nitrobenzaldehyde and at least one other isomer from which the ortho- or meta-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 crystalline aluminium phosphate zeolite.