JPS61247604A - Oxygen generator - Google Patents

Abstract

PURPOSE:To provide the titled device capable of effectively removing H2O2 contained in gaseous O2 generated from H2O2 (or H2O2-adduct) by decomposing with a decomposing catalyst by passing the gaseous O2 through a filter supporting a decomposing catalyst or a reducing material and being built-in in the O2 generator. CONSTITUTION:In the device for generating O2 from H2O2 or a H2O2-adduct using the decomposing catalyst (e.g. heavy metal powder such as Pt, metal oxide powder such as MnO2), the filter supporting said decomposing catalyst or the reducing material (e.g. active carbon, ascorbic acid, sodium thiosulfate) is built-in. H2O2 is contained in O2 generated by the effect of the decomposing catalyst, which is effectively removed by passing the H2O2-contg. gaseous O2 through the above-described filter.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to an oxygen generator that generates oxygen gas from hydrogen peroxide or a hydrogen peroxide adduct using a decomposition catalyst.

(Prior art) Conventional oxygen generation methods include HFe HCu +Ni
, Co, Mn, Cr, Pb, V, W, or a compound thereof, a suspension or a water bath liquid of one or more catalysts is brought into contact with sodium percarbonate to generate oxygen gas. (Japanese Patent Application Laid-open No. IJ@54-26990), an addition compound of charcoal soda and sensitizing hydrogen, and manganese dioxide or iron or steel used as a catalyst.

Water is added to a mixture of metal salts such as lead solidified with gum arabic at different concentrations and multiple types of water-soluble solids with different solubility to continuously generate a certain amount of oxygen over a long period of time. Oxygen generation method (% Kaisho 58-1
90804), and further sodium percarbonate (2NazCO
When adding water to r3H*Ot) to generate all oxygen,
Powders of manganese dioxide or metal salts such as iron, steel, and lead used as catalysts are mixed with polyvinyl alcohol to form solids with different disintegration times in water, and this is mixed with sodium percarbonate. Mix it with
An oxygen generation method (Japanese Unexamined Patent Publication No. 1983-1992) in which sodium percarbonate constantly generates oxygen within a certain period of time by adding an appropriate amount of water, without rapidly generating oxygen.
7-160902) and the like are known.

It is also proposed that acidic peroxo acid salts such as alkali peroxo carbonate (basic) and peroxoni sulfate are brought into contact with water to generate dust, and the residue after oxygen generation is mixed to neutralize the waste liquid. has been done.

However, in the method of obtaining oxygen gas from hydrogen peroxide solution or hydrogen peroxide adduct using a decomposition catalyst, most of the gas generated is oxygen, but some hydrogen peroxide is not decomposed into oxygen and water. May evaporate as hydrogen peroxide.

Depending on the purpose of the obtained oxygen gas, it may be possible to use it as a mixed gas, but due to the strong oxidizing power of hydrogen peroxide, it is often necessary to store it properly. Although the atmosphere may contain vaporized hydrogen peroxide, it is said that if hydrogen peroxide gas is contained in the atmosphere at 1 ppm or more, it will have an adverse effect on the human body.

As a method for removing trace amounts of hydrogen peroxide gas from the air, there is, for example, a method of passing this gas mixture into water and absorbing it into the water. This method is safe for devices that use large amounts of water. Therefore, a simple filter type is desirable for purifying the atmospheric air.

(Object of the Invention) The present invention was proposed based on the above-mentioned needs, and an object of the present invention is to provide an oxygen generation device using a set of filters for removing hydrogen peroxide gas.

(Disclosure of the Invention) Hydrogen peroxide has a boiling point of 151°C (extrapolated to 1 atm), but even at room temperature it has a boiling point of several mm Hg (1.3 g at 2g°C).
It has a vapor pressure of mm Hg). Therefore, in a saturated state, there is a possibility that the concentration of O11% by volume or more. The permissible concentration for the human body is said to be 1.-2 ppm. In general, 100 □ is required to reduce the peroxide concentration in the atmosphere that comes into contact with the human body to below the permissible concentration. . . must be reduced to a concentration of

Hydrogen peroxide is a strong oxidizing agent and is relatively chemically unstable. In the present invention, all purification methods for a set of filters have been investigated by utilizing these properties.

One method is to promote the decomposition reaction catalytically, although hydrogen peroxide is easily decomposed by itself.

Catalysts used for this purpose include metal powders with a large specific surface area, such as colloids of heavy metals such as platinum, palladium, gold, and silver, or cobalt oxide.

Examples include metal oxides such as manganese oxide and alkaline water.

Another method is to decompose and eliminate a reducing substance by bringing it into contact with a gas mixture containing hydrogen peroxide, since hydrogen peroxide has a strong oxidizing power. Suitable reducing substances include activated carbon powder, ascorbic acid, sodium thiosulfate, etc., but are not particularly limited to these.

(Example) (1) The oxygen gas generated by adding one amount of manganese dioxide powder to a 5% hydrogen peroxide solution contains 0.15 volumes of hydrogen peroxide gas.

This gas mixture was filtered into a 2m thick filter (0.05t/c, rA
) The concentration of hydrogen peroxide gas in the shitacus that passed through the roller was less than 1 pI)m.

(2) To remove hydrogen peroxide from the oxygen gas containing hydrogen peroxide generated in the same way as in (1),
When large-sized activated carbon particles were packed in a bag made of non-woven polyester fiber to form a 1 cIn thick filter, and the above mixed gas tm was poured into the bag, the hydrogen peroxide concentration was 2 ppm.

(3) In the experiment in (2), when activated carbon granules were mixed with ascorbic acid for 1 m, the hydrogen peroxide concentration in the passing gas was 1 ppm or less. As above, it is used to generate oxygen gas from hydrogen peroxide or hydrogen peroxide adducts using a decomposition catalyst, and heavy metal powder.

Decomposition catalyst such as metal oxide powder and/or activated carbon,
A device that has a built-in filter that retains reducing substances such as ascorbic acid and sodium thiosulfate, and has the effect of extremely efficiently removing hydrogen peroxide from the oxygen gas by passing the generated oxygen gas through the filter. It is.

Claims (1)

[Claims] Used to generate oxygen gas from hydrogen peroxide or hydrogen peroxide adducts using decomposition catalysts, such as heavy metal powders, metal oxide powders, etc., and/or reduction of activated carbon, ascorbic acid, sodium thiosulfate, etc. An oxygen generator with a built-in filter that retains harmful substances.