AbstractThe following is a description of an investigation into the optimum conditions for the preparation of peroxides by incomplete oxidation of propane. Special attention has been paid to the optimum formation of hydrogen peroxide.In connection with the removal of heat, it is probably only possible to use a 90/10 propane‐oxygen mixture in a technical apparatus. With this mixture the optimum production of hydrogen peroxide was found at an average reaction temperature of 465°C and a contact time of 4 sec.Under these conditions 15 moles of peroxides (9 moles of which was free hydrogen peroxide) was formed per 100 moles of propane used. At the same time 83 moles of propene was formed, in addition to 87 moles of water, 34 moles of carbon oxides, 12 moles of aldehydes, 1 mole of alcohol and 1 mole of hydrog