Attrition-resistant catalytic system and its use in the oxydehydrogenation of saturated carboxylic acids, particularly in fluid bed reactors.

摘要

This process for oxidative dehydrogenation of saturated carboxylic acids to form alpha , beta -unsaturated carboxylic acids consists in bringing the said unsaturated acids into contact with molecular oxygen or a gas containing oxygen and, if appropriate, an inert diluent gas, in vapour phase, at a reaction temperature of 250 to 600 DEG C, in the presence of a catalyst system comprising a catalyst of general formula FePxMeyOz, in which: Me denotes at least one of the following elements Li, Na, K, Rb, Cs, Mg, Ca, Sr and Ba; x has the value of 0.2 to 3.0; y has the value of 0.01 to 0.2; and z is the quantity of oxygen bonded to the other elements and corresponding to their oxidation state, in an entrained bed reactor and, if appropriate, in the presence of steam in a molar ratio to the saturated acid not exceeding 0.5. Such a catalyst system, which is in bulk form and in which the catalyst is associated with at least one zeolite, is advantageously employed.