Process for separating mixtures of 3- and 4- nitrophthalic acid

Details Process for separating mixtures of 3- and 4- nitrophthalic acid Process for separating mixtures of 3- and 4- nitrophthalic acid

C - Chemistry, Metallurgy

07

C

260/531.3

C07C 201/16 (2006.01)

Patent

CA 1101883

Abstract A novel improved process for separating mixtures of 3- and 4-nitrophthalic acid is described. The said process comprises treating a mixture of 3- and 4-nitro- phthalic acid, which mixture is free from inorganic acid residues, in an aqueous-organic medium containing 1-20 per cent by volume of water, at a temperature of between 20 and 100°C, stepwise with a base capable of forming salts of 3- and 4-nitrophthalic acid, which salts are essentially insoluble in the reaction medium, the treatment being carried out by adding base until a pH value of about 2.8 is obtained, separating the precipi- tating product consisting mainly of a 3-nitrophthalic acid mono-salt, subsequently precipitating, by the addition of further base, a product consisting principally of a 4- nitrophthalic acid salt, and finally converting the resulting nitrophthalic acid salts separately into the corresponding free acids, and optionally purifying these. The 3- and 4-nitrophthalic acid can be obtained by the process according to the invention in a simple manner in an isomer-free form and in good to very good yields.

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