Process for preparing mixed derivatives hydroxyl aromatic hydrocarbons with proportions governed mixtures these components.

The invention relates to a process for the hydroxylation of aromatic hydrocarbons by hydrogen peroxide, which process comprises reacting the substrate concerned with hdyrogene peroxide in the presence of synthetic zeolite containing heteroatoms as well as substituents crystal lattice that as exchanged components. Said process allows to obtain a mixture of hydroxylated derivatives (e.g., catechol and hydroquinone) in controlled proportions, when the reaction is performed for a charge ratio of High reagents and in the presence of a zeolite wherein the amount of titanium, calculated TiO2 is strictly in the range of from 0.1% to 7% by weight (preferably, in the range of 2% to 4%). The hydroxylation reaction is further carried out at a temperature in the range of from 60 degrees to 150 degrees C, in the sole presence of the hydrocarbon substrate or in the presence of an auxiliary solvent which allows the hydrocarbon to aromtique mixing, at least partially, with hydrogen peroxide.