Process for the production of H.sub.2 O.sub.2 from the elements

Details Process for the production of H.sub.2 O.sub.2 from the elements Process for the production of H.sub.2 O.sub.2 from the elements

1994-12-02

1996-04-09

Langel, Wayne

Chemistry of inorganic compounds

Oxygen or compound thereof

Peroxide

C01B 1501

Patent

active

055059210

DESCRIPTION:

BRIEF SUMMARY
DESCRIPTION

The invention concerns a process for the production of hydrogen peroxide by reacting hydrogen and oxygen in aqueous suspension in the presence of a catalyst.
Hydrogen peroxide is used in large amounts in industry e.g. to bleach wood, textiles, paper, oils, fats, to produce bleaching agents for the detergent industry and in particular sodium perborate, and for cleansing agents and cosmetics, to bleach hair, as starting product for epoxides, peroxide catalysts, glycerol, plasticizers, alkyl and acyl peroxide, peroxocarboxylic acids, for disinfection and to an increasing extent in the field of environmental protection to detoxify and deodorize water, waste water and waste air, to bleach pulp, deink waste papter, to desulphurize flue gas, to clean Si chips in the electronic industry etc.
Since it can be used in a great variety of ways and is important in industry, the production processes for hydrogen peroxide is therefore becoming increasingly important. The usual industrial processes for the production of hydrogen peroxide are based on oxidation processes using isopropanol and on autoxidation processes using anthraquinones.
Various methods for the direct synthesis of hydrogen peroxide from hydrogen and oxygen have also already been proposed.
EP-B 0 049 806 describes a process for the direct synthesis of hydrogen peroxide using a palladium supported catalyst in a liquid medium which is comprised of methanol and contains up to 1% by weight formaldehyde.
According to EP-B 0 117 306 an acidic aqueous solution which contains an oxygen-containing organic compound is used in the presence of a palladium catalyst.
A process for the direct synthesis from hydrogen and oxygen is known from U.S. Pat. No. 4,336,239 which is carried out in an acidic aqueous solution containing methanol or acetone in the presence of a supported catalyst with a platinum metal e.g. palladium as the catalytically active metal.
A process is known from EP-B 0 049 809 for the direct synthesis of hydrogen peroxide by contacting a gas mixture containing hydrogen and oxygen with an acidic aqueous liquid which contains up to 95% by volume of a ketone, aldehyde or alcohol in which the formation of hydrogen peroxide takes place on a supported catalyst and detached palladium salts are removed for example by an ion exchange resin in order to prolong the effective life-span of the catalyst and to inhibit the decomposition of the hydrogen peroxide formed.
A disadvantage of the aforementioned processes is the use of organic substances as a component of the liquid reaction medium.
When organic substances are present this is associated with the possibility that organic peroxides may be formed which can lead to a high inflammability of the solvents used and the formation of explosive mixtures with hydrogen peroxide (cf. e.g. Schumb et al., Hydrogen Peroxide, Reinhold Publishing Corporation, 179 (1955); Swern, Organic Peroxides, Wiley--Interscience New York, 26 (1970)2). By this means the possibility of danger considerably increases when direct syntheses are carried out in this manner.
With regard to carrying out the procedure more safely and the purification of the hydrogen peroxide which formed it is more advantageous to carry out the direct synthesis from hydrogen and oxygen in an aqueous medium which is as free as possible of organic components.
Such a process is described in EP-A 0 132 294 in which a commercially available or in situ generated palladium supported catalyst is used in an aqueous reaction medium which is essentially free of organic components and in which the hydrogen ion and chloride ion concentration is between 0.01 and 2 mol/l. The reaction is carried out at a total pressure of up to 100 bar.
A similar process is known from EP-A 0 274 830 in which the aqueous reaction medium contains sodium bromide and sulphuric acid whereby the use of bromide ions yields better results compared to the use of chloride ions at the same concentration with regard to selectivity and yield. Supported catalysts which are coated with palladium/platin

REFERENCES:
patent: 3361533 (1968-01-01), Hooper
patent: 3839192 (1974-10-01), Hayes
patent: 4009252 (1977-02-01), Izumi et al.
patent: 4048096 (1977-09-01), Bissot
patent: 4279883 (1981-07-01), Izumi et al.
patent: 4393038 (1983-07-01), Sun et al.

Affiliated with

Also associated with

Rating

Process for the production of H.sub.2 O.sub.2 from the elements 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 the production of H.sub.2 O.sub.2 from the elements, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for the production of H.sub.2 O.sub.2 from the elements will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-136957