Question

how H2O2 is prepared by auto oxidation method

Answer 1

Hydrogen peroxide is a bleaching compoundthat can be soluble in water. It is largely used in mining and in manufacturing of organic peroxides and also as additive in cosmeticsand disinfectants. Important hydrogen peroxide manufacturing technology processes:

Autoxidation of 2-alkylanthrahydroquinonesAutoxidation of isopropyl alcoholAutoxidation of hydrazobenzeneReaction between water and oxygenCombination reaction of hydrogen and oxygenReaction of sodium peroxide or bariumperoxide with acidsHuron-Dow process (electrolytic methods)Process flow sheet of Hydrogen peroxide manufacturing

Hydrogen peroxide production in large scale by autoxidation method

Anthrahydroquinone autoxidation is known as Riedl Pfleiderer process and it is 70 years old. In the first reactor show in the process flowsheet below, hydrogen is feed with recycling anthrahydroquinone and reactor is called as hydrogenator it operates with 75 oC temperature and 200-350 KPa pressure. On the surface of Raney nickel hydrogen is reacted to the outer oxygen bond of anthrahydroquinone and passed to oxidizer where air is fed in counter direction to form hydrogen peroxide. Outlet from oxidiser is fed to extractor to separate the anthrahydroquinone for recycling process. Bottom stream of the extractor is fed to still to concentrate the hydrogen peroxide