Chemistry of inorganic compounds – Modifying or removing component of normally gaseous mixture – Nitrogen or nitrogenous component
Patent
1989-01-24
1991-05-14
Straub, Gary P.
Chemistry of inorganic compounds
Modifying or removing component of normally gaseous mixture
Nitrogen or nitrogenous component
110345, 422 4, 422 28, 55 97, 55524, 55318, 261100, 34192, C01B 2100
Patent
active
050154516
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATIONS
This is a national phase application of PCT/EP No. 88/00469 filed 26 May 1988 and based on German National Applications Nos. P 37 18 021 of 27 May 1987, P 37 19 067 of 6 June 1987 and P 37 24 0.50 of 21 July 1987 under the International Convention.
1. Field of the Invention
The invention relates to a process, a filter, and a device for the elimination of bacteria and/or viruses and/or fungi and/or spores and/or germs and/or allergens and/or pollutants and/or odors and the like from breathing air using a filter consisting of one or several layers of a chemisorption mass.
2. Background of the Invention
It is known that biofilters and such in operation for longer periods of time release fungus spores and bacteria.
According to the invention, downstream of the biofiltermasses, chemisorption mass filters are arranged in individual layers.
These chemisorption mass layers are arranged in accordance with the invention by alternating strongly alkaline masses of an approx. pH value of 12.8 and strongly acid masses with a pH of 0.5-1.0.
Preferably the following masses are used:
The bulk material is coal coke of the type classified as crushed coke IV or crushed coke III; the coke is soaked in sodium potassium hydroxide potassium- or sodium carbonate or soda lime solution and is used as the alkaline mass with a pH of approx. 12.8.
For the preparation of acid masses with a pH 0.5-1.0, the soaking solutions used are acid FeII/FeIII salts brought with sulfuric acid to a pH-value of 05.-1.0. A pure coke charge of the above-mentioned types of crushed coke is used as the exit layer.
It has been found that the alternating effect of the chemisorption filter arranged downstream of the biofilter, with its alternating effect of strongly alkaline and strongly acid masses, kills the bacteria and fungus spores, which are retained by the bulk material.
After the depletion of the filter, the coke can be supplied as additional fuel to a garbage-incinerator installation.
In order to improve the killing of germs and the elimination of odors from the breathing air through the used chemisorption masses with various pH-values, in repeated alternations of alkaline to acid and/or neutral, or with the reverse alternating effect, the invention provides that dust-arresting substances, particularly in fiber form, be soaked with the specific masses, and in this way be used alternatingly, according to use and the bacteria, germs, fungi or viruses to be killed, either as acid, or as alkaline or vice versa, in hospital areas, residential areas or laboratories, or in case of allergies.
The hereby used humidity-absorbing felt-like mats, soaked with the corresponding alkaline and/or neutral and/or acid washing fluids are dried and then built into the chemisorption filter as a mat-like filtering material, according to the afore-described system.
According to the invention, its further proposed to insert, between the individual alkaline, acid and/or neutral layers, humidity-repellant hydrophobic fleece layers are inserted as intermediate layers, which has as a result that no humidity absorption from the space takes place, and thereby no contacts take place between the alkaline, acid and neutral, or neutral, alkaline and acid layers, and that no neutralizing transfer can result, particularly in acid or alkaline chemisorption layers.
Besides, in the case of allergy sufferers, it has been found appropriate to use as a last chemisorption filter stage, instead of the neutral active coal filter-stage, an alkaline or, corresponding to the allergy an acid acting chemisorption stage.
For this purpose, for instance carbonates and/or acid FeII-containing products are used.
It is known to produce filters for air filtration in car cabins, which filter out the dust.
Furthermore, in order to clean the air, it is known to produce filters which insure a germ-free environment, which are arranged in a bactericidal and fungicidal manner, and which also can be an absolute germ barrier.
It is further known to use chemisorption filters a
REFERENCES:
patent: 1789194 (1931-01-01), Rockwell
patent: 3017239 (1962-01-01), Rodman
patent: 3457040 (1969-07-01), Jennings
patent: 3804942 (1974-04-01), Kato et al.
Gresch Heinrich
Holter Heinz
Igelbuscher Heinrich
Burke A. Lester
Dubno Herbert
Holter Heinz
Straub Gary P.
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