Reducing meta content of isomeric mixtures of halo...

Details Reducing meta content of isomeric mixtures of halo... Reducing meta content of isomeric mixtures of halo...

C - Chemistry, Metallurgy

07

C

C07C 17/395 (2006.01) C07C 17/12 (2006.01) C07C 25/02 (2006.01)

Patent

CA 2351000

Disclosed is a method of separating the meta isomer of a halotoluene having general formula (I) from a mixture with at least one other isomer, where X is Cl or Br. About 0.0001 to about 5 wt% of a Friedel-Crafts catalyst is added to the mixture and the mixture is exposed to a brominating agent which preferentially brominates the meta isomer. The mixture is then heated at a temperature above the boiling point of the other isomers but below the boiling point of the brominated meta isomer.

L'invention concerne un procédé de séparation du méta-isomère d'un toluène à substitution halo représenté par la formule générale (I) dans un mélange avec au moins un autre isomère. Dans cette formule, X représente Cl ou Br. Entre environ 0,0001 et environ 5% en poids d'un catalyseur de Friedel-Crafts est ajouté au mélange. Ce dernier est exposé à un agent de bromation qui brome de préférence le méta-isomère. Le mélange est ensuite chauffé à une température supérieure au point d'ébullition des autres isomères mais inférieure au point d'ébullition du méta-isomère bromé.

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