Patents Examined by Oscar R. Wertz
  • Apparatus for producing SO.sub.3 and sulphuric acid by a catalytic of gases which contain SO.sub.2
    Patent number: 4008316
    Abstract: Process for production of SO.sub.3 by catalytic oxidation of SO.sub.2 which comprises carrying out the oxidation in two stages with intermediate absorption. The conversion of SO.sub.2 in the first stage is about 70-80% for a starting gas which is a cooled and cleaned roaster gas and 70-90% for a starting gas which is a sulfur combustion gas. The second stage comprises two catalyst beds, and the gas is cooled intermediate the beds. High overall conversion is obtained with low catalyst requirement.
    Type: Grant
    Filed: July 10, 1972
    Date of Patent: February 15, 1977
    Assignee: Metallgesellschaft Aktiengesellschaft
    Inventors: Herbert Drechsel, Karl-Heinz Dorr, Hugo Grimm