Gas separation: processes – Solid sorption – Inorganic gas or liquid particle sorbed
Patent
1999-06-28
2000-05-30
Spitzer, Robert H.
Gas separation: processes
Solid sorption
Inorganic gas or liquid particle sorbed
95136, 95141, 96108, 96153, 96222, B01D 5304
Patent
active
060686812
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a filtration device for neutralizing the volatile unpleasant odors present in an atmosphere or conveyed by a stream of gas.
The invention also relates to a process using such a filtration.
The invention finds a particularly important, although not exclusive, application in the field of treating unpleasant odors such as body odors in bathrooms or in hairstyling salons, kitchen odors and tobacco odors, as well as particularly tenacious odors such as those of excrement or the odors of decomposing materials in public refuse sites.
The invention is also applicable to odors from factory chimneys, from purification plants and more generally to any malodorous gaseous effluent arising from industrial, commercial or residential sites.
Various methods and devices for treating unpleasant odors are already known.
A first technique consists in overcoming these odors by masking, either quantitatively by perfuming the atmosphere with a large amount of a more pleasant aromatic product, or by binding the malodorous molecules, in general by complexing them with other molecules, to give a product which has a different and more pleasant aroma.
However, this masking technique has drawbacks, since such a superposition does not completely eliminate the unpleasant odors, in particular given the very great sensitivity of human olfactory nerves.
For example, man remains sensitive to hydrogen sulfide even when its proportion in the atmosphere does not exceed 3 ppm.
Another technique envisaged is that of filtration.
This consists in reducing the unpleasant odors by filtering the odoriferous molecules during emission.
Thus, filters containing active charcoals which give acceptable results are known. However, since such filters cannot be absolute in practice, they allow malodorous molecules to pass through.
The present invention is directed toward providing a device and a process for treating unpleasant odors, which device and process are better than those previously known in terms of meeting the practical requirements, in particular as regards allowing better air purification in a simple, effective and inexpensive manner.
By using, in combination, mechanical filtration, with adsorption of the malodorous molecules, and release of perfuming molecules and/or of a composition of these pleasant-smelling molecules, the atmosphere or the stream of malodorous gas treated are thus purified and pleasantly perfumed.
With this aim, the invention proposes essentially a filtration device for neutralizing the volatile unpleasant odors present in an atmosphere or conveyed by a stream of gas, characterized in that it includes at least one layer of material made of natural zeolite of determined thickness, said layer being impregnated with an aqueous solution, with, per 100 parts by weight of zeolite, about 5 to about 20 parts by weight of said aqueous solution, said aqueous solution comprising, per 1000 parts by weight of water, between about 1 part and about 20 parts by weight of a composite mixture comprising, per one part of ammonium ions or equivalent, one part of at least one composition of perfuming and/or deodorizing nature.
The thickness of the layer is determined in a manner within the capability of those skilled in the art, as a function of the specific use of the filter depending on the characteristics of the filtered, gas, i.e. essentially the average flow rate of the malodorous molecules passing through the filter.
The adsorbing nature of the natural zeolite, the humidification of the atmosphere achieved by means of this filter appropriately impregnated with water and renewed over time, as well as the possibilities of release of perfuming and/or deodorizing molecules into the stream of filtered gas or into the filtered atmosphere, thus allow excellent physicochemical purification.
In advantageous embodiments, use is furthermore made of one and/or other of the following provisions: composite mixture; average particle size of between about 0.1 cm and about 5 cm; which is effective for neutralizing the unpleasa
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Deotech
Spitzer Robert H.
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