HYDROGEN PEROXIDE PRODUCTION PROCESS Russian patent published in 2004 - IPC

FIELD: industrial inorganic synthesis.

SUBSTANCE: concentrated hydrogen peroxide aqueous solutions are obtained by direct synthesis from H₁ and O₂ using feeding liquid and gas streams as well as heterogeneous catalyst into reactor and removing liquid stream containing hydrogen peroxide and water and gas stream. Starting liquid stream contains alcohol (at least 50 wt %), e.g. methanol, C₁-C₄-alcohol mixture without or with water, and acid and halogenated promoters. Acid promoter can be H₂SO₄ or H₃PO₄ in amounts 20 to 1000 mg per 1 kg liquid. Heterogeneous contains 0.1 to 3 wt % Pd and 0.01 to 1 wt % Pt at Pt/Pd atomic ratio between 1:500 to 100:100, the metals being supported by activated carbon. Gas stream at the entry of reactor contains below 4.5 vol % H₂ and below 21 vol % O₂ with balancing amount of N₂. Liquid stream at the outlet of reactor contains 2-10 wt % H₂O₂. Gas stream at the reactor outlet contains unreacted H₂ and O₂ and also N₂. Reaction is effected and temperature from -10 to +60^оС, pressure 0.102 to 30.51 MPa for 0.05 to 5 h. Liquid leaving reactor is supplemented by water in a manner as to provide its amount the same as in finished product, after which liquid is sent to distillation system operated at atmospheric pressure or below. Distillation system is composed of one or more evaporators or in series connected columns. Alcohol or water-alcohol solutions obtained from top sections of columns are recycled into reactor and H₂O₂ solutions with gradually rising concentrations are obtained from bottom sections. Water can be added when pressure is dropped to atmospheric and after inert gas purge before and evaporator or column. Invention enables production of concentrated solution containing 15 to 60 wt % H₂O₂, which can be supplied to consumers without further purification.

EFFECT: enhanced process efficiency, avoided environmental damage, and reduced industrial production investments.

28 cl, 5 ex