Verfahren zur Gasphasenpartialoxidation von aromatischen Kohlenwasserstoffen

摘要

The invention relates to a method for the catalytic vapour-phase partial oxidation of aromatic hydrocarbons to form carboxylic acids or carboxylic acid anhydrides at an increased temperature. According to said method, a vapour stream charged with the educt is guided through a multi-tube flow reactor, said reactor being maintained at the correct temperature by means of one or more separate thermostatic baths, which have a counter-current circulation in relation to the educt vapour stream. The difference between the temperature of the thermostatic bath in the vicinity of the reactor outlet and the temperature of the product vapour stream that leaves the reactor is used to control the selectivity of the vapour-phase oxidation.