RU2806435C2 - Method of combating unpleasant odour - Google Patents

Abstract

FIELD: odour control.

SUBSTANCE: inventions is related to combatting unpleasant odours in the outgoing air from containers, rooms or installations in which strong-smelling substances are stored or processed. A method for controlling unpleasant odours in the outgoing air from containers, rooms or installations in which strong-smelling substances, such as faeces, waste or strong-smelling food, are stored or processed, in which a fluid in finely divided form is introduced into the outgoing air, which neutralizes the odour of the substances contained in the outgoing air, the fluid being a concentrate of the active substance, which consists of 55-65 wt.% triethyl citrate, 17.5-22.5 wt.% 1,2-propanediol and 17.5- 22.5 wt.% from di-propylene glycol methyl ether. A method of controlling unpleasant odours in the air from premises in which strong-smelling substances, such as faeces, waste or strong-smelling food, are stored or processed, in which a fluid in a finely divided form is introduced into the indoor air, which neutralizes the odour of substances contained in the indoor air , wherein the fluid is a mixture of a mixture of propellant gas and a concentrate of the active substance, which is contained in the propellant gas mixture in an amount of 0.1-8 wt.%, and the propellant gas mixture consists of 55-80 wt.% butane , 15-40 wt.% from propane and 1-25 wt.% from isobutane, and the active substance concentrate consists of 55-65 wt.% triethyl citrate, 17.5-22.5 wt.% from 1, 2-propanediol and 17.5-22.5 wt.% from di-propylene glycol methyl ether. The use of a concentrate consisting of 55-65 wt.% triethyl citrate, 17.5-22.5 wt.% 1,2-propanediol, 17.5-22.5 wt.% di-propylene glycol methyl ether, to combat unpleasant odours in emanating or indoor air from containers, rooms or installations in which strong-smelling substances such as faeces, waste or strong-smelling food are stored or processed.

EFFECT: inventions make it possible to effectively and simultaneously significantly reduce the amount of required active substances.

3 cl, 3 dwg

Description

The invention relates to a method for combating unpleasant odors in the outgoing air from containers, rooms or installations in which strong-smelling substances, such as feces, waste or strong-smelling food, are stored or processed, in which a fluid in a finely divided form is introduced into the outgoing air, which physically and/or chemically neutralizes the odor of substances contained in the outgoing air.

This kind of method is known, for example, from DE 100 38 063 A1. In this known method, a fluid sprayed in finely dispersed form, here water, contains as an active substance additives in the form of tensides and/or mixtures of tensides, enzymes and/or mixtures of enzymes, hydrogen peroxide, solutions of oxidizing agents, solutions of reducing agents or amorphous substances, without more precise indication of which active substances are specifically used here.

According to the prior art (see WO 02/13776 A2; JP 2016/202575 A; FR 3019 048 A1 and US 2014/162932 A1) it is also generally known for the control of unpleasant odors on the human body or in occupied premises by the use of a fluid medium containing triethyl citrate, 1,5-propanediol and di-propylene glycol methyl ether. In the prior art, these substances are introduced, however, constantly in combination with other active substances, such as, for example, fragrances, in order not only to combat unpleasant odors, but also to create a pleasant odor by layering and masking.

The next method of the kind mentioned at the beginning, however, with a precise indication of the active substances individually, is known from the European patent EP 2 383 398 B1, which comes from the same inventors as this patent application. In this prior art method, the atomized fluid consists of an aqueous solution which contains active substances from 2.5 vol.% to 10 vol.% glycerol, 0-2.5 vol.% glycol and 0-2.5 vol. % n-butyl ester of acetic acid.

Despite the fact that the method working with this fluid medium has proven itself in practice, it still leaves much to be desired with regard to its efficiency and the relatively large minimum quantities of active substance (glycerol) in the fluid medium, in particular when it comes to to eliminate particularly strong-smelling unpleasant odors. This drawback is particularly important when extremely large quantities of outgoing air have to be processed, for example outgoing air from installations that are located in large workshops or even outdoors, such as, for example, waste sorting plants, asphalt mixing plants, biogas plants , open wastewater guides or settling basins.

Therefore, the object of the invention is to improve the method of the type indicated initially in terms of its effectiveness and at the same time to significantly reduce the amount of active substances required.

To solve this problem, the invention proposes, based on a method of the kind indicated at the outset, that the fluid is a 0.1% to 8% aqueous solution of an active substance concentrate, which consists of 55-65 wt.% triethyl citrate, 17. 5-22.5 wt.% from 1,2-propanediol and 17.5-22.5 wt.% from di-propylene glycol methyl ether.

Surprisingly, it has been found that by using such an active substance concentrate, the amount of active substance in the aqueous fluid can be significantly reduced without compromising the odor control effect and without the need for other active substances. The significantly stronger suppression or absorption of odor should be attributed to the interaction between the extractively and catalytically active main component triethyl citrate, the fogging and hygroscopic action of 1,2-propanediol and the solvent and also hygroscopic action of dipropylene glycol methyl ether. In particular, the catalytic action of triethyl citrate ensures that odors are not only covered or masked, but also destroyed by chemically transforming the odor-producing substances. These odor-producing substances are, in particular, polycyclic aromatic hydrocarbons (PAH) with condensed ring systems, which are destroyed by the above-mentioned actions of triethyl citrate and thus, for the most part, lose not only their olfactory effect, but are also made rapidly degradable by natural processes decomposition.

But the above-mentioned positive effects of the new combination of active substances are achieved not only by using a concentrate of the active substance diluted in an aqueous solution, but are also achieved when a concentrated active substance, otherwise distributed sufficiently finely, is introduced into bad-smelling air. In particular, it is possible to promote a sufficiently fine distribution of the active substances such that the concentrate is mixed in a measured amount with a suitable propellant gas and, with the help of this propellant, is sprayed out of a suitable aerosol can. This option is especially suitable when an unpleasant odor must be combated with small amounts of air.

Further, the subject of the invention is a method for combating unpleasant odors in the air of premises in which strong-smelling substances, such as feces, waste or strong-smelling food, are stored or processed, in which a fluid in a finely divided form is introduced into the indoor air, which physically or chemically neutralizes the smell of substances contained in the air of the room, while this method is characterized in that the fluid medium is a mixture of a mixture of propellant gas and a concentrate of the active substance, which is contained by 0.1-8 wt.% in the mixture of propellant gas, while the propellant gas mixture consists of 55-80 wt.% butane, 15-40 wt.% propane and 1-25 wt.% isobutane, and the active substance concentrate consists of 55-65 wt.% triethyl citrate, 17.5-22.5 wt.% from 1,2-propanediol and 17.5-25.5 wt.% from di-propylene glycol methyl ether.

The following experiments to combat unpleasant odors using the method according to the invention were extremely successful.

Example 1.

In the light packaging waste sorting plant (LVP sorting plant), a fine mist consisting of 2.5 wt.% triethyl citrate, 1.25 wt.% propanediol, 1.25 wt.% di-propylene glycol methyl ether and 95 wt.% water. Thanks to this measure, unpleasant odors could be eliminated down to the limit of audibility. In this case, the irrigation devices were specifically located in the area of the workshop gates, which, due to constant movement, had to remain constantly open. Thanks to this targeted placement of the odor control device in the area of the workshop gate, effective odor blocking was achieved, so that neighboring property owners were no longer bothered by unpleasant odors from this LVP sorting plant.

Example 2.

In the area of the largely open area of the asphalt loading and unloading plant at the asphalt mixing plant, sprinkler devices were installed in the area of the loading gates, with the help of which a fine mist consisting of 1 wt.% triethyl citrate, 0 .5 wt.% propanediol, 0.5 wt.% di-propylene glycol methyl ether and 98 wt.% water. Despite the very low content of active substance in the fluid here, thanks to this measure it was possible to achieve almost complete elimination of the odor of asphalt.

Example 3.

In a household with pets, aerosol cans were used to eliminate unpleasant odors, from which a mixture of a propellant gas and an active substance concentrate according to the invention was sprayed in fine form into the air of rooms with odors. Also here, almost complete elimination of the unpleasant odor was achieved.

Claims (11)

1. A method of controlling unpleasant odors in the outgoing air from containers, rooms or installations in which strong-smelling substances, such as feces, waste or strong-smelling food, are stored or processed, in which a fluid in finely divided form is introduced into the outgoing air, which neutralizes the smell of substances contained in the outgoing air, characterized by that the fluid is a 0.1% - 8% aqueous solution of the active substance concentrate, which consists of 55-65 wt.% triethyl citrate, 17.5-22.5 wt.% 1,2-propanediol and 17 .5-22.5 wt.% from di-propylene glycol methyl ether. 2. A method of controlling unpleasant odors in the air from premises in which strong-smelling substances, such as feces, waste or strong-smelling food, are stored or processed, in which a fluid in a finely divided form is introduced into the room air, which neutralizes the odor of the substances contained in indoor air, characterized by that the fluid medium is a mixture of a mixture of propellant gas and a concentrate of the active substance, which is contained in an amount of 0.1-8 wt.% in the propellant gas mixture, and the propellant mixture consists of 55-80 wt.% butane, 15-40 wt.% from propane and 1-25 wt.% from isobutane, and the active substance concentrate consists of 55-65 wt.% triethyl citrate, 17.5-22.5 wt.% from 1.2 -propanediol and 17.5-22.5 wt.% from di-propylene glycol methyl ether. 3. Application of a concentrate consisting of - 55-65 wt.% triethyl citrate, - 17.5-22.5 wt.% 1,2-propanediol, - 17.5-22.5 wt.% di-propylene glycol methyl ether, to control unpleasant odors in emanating or indoor air from containers, rooms or installations in which strong-smelling substances such as feces, waste or strong-smelling food are stored or processed.