Patent ID: 8598065

Claim:
A process for charging a longitudinal section of a catalyst tube with a uniform fixed catalyst bed section whose active composition is at least one multielement oxide which comprises a) the elements Mo, Fe and Bi, or b) the elements Mo and V, or c) the element V and additionally P and/or Sb, or whose active composition comprises elemental silver on an oxidic support body, and which consists of a single type S i or of a homogenized mixture of a plurality of mutually distinguishable types S i of geometric shaped catalyst bodies or of geometric shaped catalyst bodies and geometric shaped inert bodies, where the median of the longest dimensions L s i of the geometric shaped bodies of one type S i has a value D s i , wherein, at least within one type S i of geometric shaped bodies, the proviso M that from 40 of the total number of geometric shaped bodies belonging to to 70% S i has a longest dimension L S i for which 0.98 · D S i ≦ L S i ≦ 1.02 · D S i , at least 10% of the total number of the geometric shaped bodies belonging to S i has a longest dimension L S i for which 0.94 · D S i ≦ L S i < 0.98 · D S i , at least 10% of the total number of the geometric shaped bodies belonging to S i has a longest dimension L S i for which 1.02 · D S i < L S i ≦ 1.10 · D S i , less than 5% of the total number of geometric shaped bodies belonging to S i has a longest dimension L S i for which 0.94 · D S i > L S i , and less than 5% of the total number of the geometric shaped bodies belonging to S i has a longest dimension L S i for which 1.10 · D S i < L S i is satisfied.