| 摘要 |
<p>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.</p> |
