Process for preparing terephthalic acid 2,5-di- (phenylamino) and dialkyl esters thereof with high purity.

The invention relates to a method for the production of terephthalic acid dialkyl esters 2,5-di- (phenylamino) of formula (I) wherein R is a hydrogen atom or a group methyl and R '' A GROUP METHYL ETHYL or group, by dehydrogenation (oxidation) of the corresponding ester dialkyl terephthalic acid 2,5-di (phenylamino) -dihydro (3.6) OXYGEN, characterized in that superimposes a solution or suspension of terephthalic acid dialkyl eSTER 2,5-di- (phenylamino) -dihydro (3.6) IN AROMATIC HYDROCARBONS IN AN OXYGEN stirred tank reactor, this reaction mixture is transported CIRCUIT THROUGH A spraying device, so that DISTRIBUTE THE MIX REACTION sprayed on the reaction mixture EXISTS IN STIRRING ,, BOILER WITH WHICH THE REACTION MIXTURE OF SPRAY WITH GAS MIXING CIRCUIT. The method has the advantage of a short response time KINGDOM A FAVORABLE SPACETIME YIELDS AND SIMPLICITY OF APPLIANCES.