Improved method for preparing acrylic acid

A process for the manufacture of acrylic acid comprising reacting propylene and oxygen (preferably in the form of air) in a reaction zone having a catalyst characterized by that following formula: AaBbCcCadFeeBifMo12=Ox, where A=one or more of Li, Na, K, Rb and Cs; B=one or more of Mg, Sr, Mn, Ni, Co and Zn; C=one or more of Ce, Cr, Al, Sb, P, Ge, Sn, Cu, V and W and; a=0.01 to 1.0; b and e=1.0-10:c=0 to 5.0, preferably 0.05 to 5.0, especially preferred being 0.05 to 4.0, and x is a number determined by the valence requirements of the other elements present; at an elevated temperature to produce acrylic acid and acrolein. 一种制备丙烯酸的方法，该方法包括丙烯和氧(优选空气形式的氧)在反应区内、在高温下反应制备丙烯酸和丙烯醛，所述反应区具有以下式为特征的催化剂：A#-[a]B#-[b]C#-[c]Ca#-[d]Fe#-[e]Bi#-[f]Mo#-[12]O#-[x]，其中A＝Li、Na、K、Rb和Cs中的一种或多种；B＝Mg、Sr、Mn、Ni、Co和Zn中的一种或多种；C＝Ce、Cr、Al、Sb、P、Ge、Sn、Cu、V和W中的一种或多种；和a＝0.01-1.0；b和e＝1.0-10；c＝0-5.0，优选为0.05-5.0，特别优选为0.05-4.0，和x是通过存在的其它各元素的化合价要求所确定的数。