Process for preparing hydrogen peroxide

Details Process for preparing hydrogen peroxide Process for preparing hydrogen peroxide

2007-01-02

2007-01-02

Langel, Wayne A. (Department: 1754)

Chemistry of inorganic compounds

Oxygen or compound thereof

Peroxide

Reexamination Certificate

active

10879501

ABSTRACT:
The present invention discloses a process for the production of hydrogen peroxide from hydrazine hydrate or hydrazine salt, represented by a general formula:in-line-formulae description="In-line Formulae" end="lead"?N2H4.nX,in-line-formulae description="In-line Formulae" end="tail"?wherein, X is H2O, H2SO4, HNO3, HCl, HBr, HI or CH3COOH; n is 0.5, 1 or 2; N is nitrogen; H is hydrogen; S is sulfur; Cl is chlorine; Br is bromine; and I is iodine, by its liquid phase oxidation with oxygen, using a solid catalyst comprising palladium but with or without halogen promoter, in an aqueous reaction medium with or without comprising a mineral acid and/or halide anions, which comprises:i) contacting the solid catalyst with a hydrazine hydrate or hydrazine salt and oxygen containing gas selected from oxygen, air and oxygen enriched air, in aqueous reaction medium at the following reaction conditions:the concentration of hydrazine hydrate or hydrazine salt in the reaction medium above 0.001 mol/dm3, the concentration of mineral acid in the reaction medium in the range from zero mol/dm3to 10 mol/dm3, the concentration of halide anions added to the reaction medium in the range from zero mmol/dm3to 100 mmol/dm3, the concentration of the solid catalyst in the reaction medium in the range from 0.01 g/dm3to 100 g/dm3, the space velocity of the oxygen containing gas in the range from 100 cm3/g catalyst/h to 100,000 cm3/g catalyst/h, the mass ratio of hydrazine hydrate or hydrazine salt to solid catalyst in the range from 0.01 to 100, the temperature below 100° C., the pressure at least 0.95 atm, and the reaction contact time above 0.02 h; andii) separating the H2O2from the reaction mixture.

REFERENCES:
jGrinberg et al, “Ozone oxidation of hydrazine salts, N2H4.HNO3 and N2H4.H2SO4, in aqueous solutions”, Zhurnal Neorganicheskoi Khimii (1968), 13 (8), 2039-42.

Affiliated with

Also associated with

Rating

Process for preparing hydrogen peroxide does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Process for preparing hydrogen peroxide, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for preparing hydrogen peroxide will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3780271