(1,3)-Butadiene oxidn. to maleic anhydride in high yield - using a complex catalyst contg. several metals and oxygen

摘要

Oxidn. catalyst YaSbbMocVdZeOx (I) is used for the improved synthesis of maleic anhydride from 1,3-butadiene and molecular oxygen (II) at 250-600 degrees C. In (I), Y is Li and/or Ce; Z is W, Mg, Al or Ni as the metal or its oxide; a and d = 0.01-1.0; b and c = 1-9; e = 0-1; x = a number which satisfies the valence requirements of the other elements present. Improved yields of clean maleic anhydride and a decreased amt. of waste by-prods. are obtd. by using (I). In an example, 1,3-butadiene and air were passed over Lio.1sbMo3Vo.1Ox + W degrees 0.06 in a stainless steel tube. The heating jacket around the tube was at 360-371 degrees C and the contact time was 3.3 secs.