Patent ID: 7777082
Filing Date: 2010-08-17
Classification: B01J,C07C

Abstract:
1. A process for preparing an annular unsupported catalyst having at least one member selected from the group consisting of a curved and uncurved top surface thereof, whose active composition has a stoichiometry of the general formula I where X X X X a=from 0.2 to 5, b=from 0.01 to 5, c=from 0 to 10, d=from 0 to 2, e=from 0 to 8, f=from 0 to 10 and n=a number which is determined by the valency and frequency of the elements in I other than oxygen, or a stoichiometry of the general formula II where Y Y Y Y Y Y Y a′=from 0.01 to 8, b′=from 0.1 to 30, c′=from 0 to 4, d′=from 0 to 20, e′ is from >0 to 20, f′=from 0 to 6, g′=from 0 to 15, h′=from 8 to 16, x′, y′=numbers which are determined by the valency and frequency of the elements in II other than oxygen and p, q=numbers whose p/q ratio is from 0.1 to 10, and whose annular geometry, without taking into account any existing curvature of the top surface, has a length L of from 2 to 11 mm, an external diameter E of from 2 to 11 mm and a wall thickness W of from 0.75 mm to 1.75 mm, comprising generating a finely divided shapeable mixture from sources of the elemental constituents of the active composition and, optionally after adding at least one member selected from the group consisting of shaping and reinforcing assistants, compressing this mixture to form annular shaped unsupported catalyst precursor bodies whose top surfaces are at least one member selected from the group consisting of curved and uncurved, and converting these to the annular unsupported catalysts by thermally treating at elevated temperature, wherein the side crushing strength of the annular shaped unsupported catalyst precursor bodies is ≧12 N and ≦23 N, and wherein the annular geometry additionally fulfills the condition L/E=from 0.3 to 0.7.