AO (Autoxidation, or Air Oxidation, or Anthraquinone Oxidation)


AO (Autoxidation, or Air Oxidation, or Anthraquinone Oxidation) :

A process for making hydrogen peroxide from hydrogen and oxygen (air) by cyclic oxidation/reduction of an alkyl anthraquinone solution (the working solution). Invented by H.-J. Riedl and G. Pfleiderer in Germany in the mid-1930s; piloted by IG Farbenindustrie in Ludwigshaven during World War II, and commercialized in the UK and United States during the 1950s. Now virtually the sole manufacturing process. Anthraquinone + H2  (heterogeneous catalyst). Anthraquinone + H2O2 and Anthraquinol + O2 Anthraquinone + H2O2. The Anthraquinol derivative is usually 2-ethyl- or 2-pentyl-anthraquinone. The solvent is usually a mixture of two solvents, one for the quinone and one for the quinol. The hydrogenation catalyst is usually nickel or palladium on a support. The hydrogen peroxide is produced at a concentration of 20 to 40 percent and is concentrated by distillation. (Check source for accuracy of chemical formula)

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