Photocatalytic composition
Abstract
Photocatalytic composition comprising at least one photocatalytic agent and at least one inorganic binder, characterized in that said inorganic binder comprises an aqueous colloidal dispersion of silica (SiO2), in which the SiO2 particles represent from 20 to 50% in weight of the colloidal aqueous dispersion and have a diameter between 10 and 40 nanometers, said silica particles being able to bind to each other after having coated the photocatalyst agent.

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23 claims: 2 independent, 21 dependent
- 1ES 2 167 114 T3 REIVINDICACIONES 1. Composición fotocatalítica que comprende por lo menos un agente fotocatalizador y por lo menos un ligante inorganico, caracterizada porque dicho ligante inorganico comprende una dispersión coloidal acuosa de dióxido de sílice (SiO 2 ), en la cual las partículas de SiO 2 representan de 20 a 50% en peso de la dispersion acuosa coloidal y tienen un diómetro comprendido entre 10 y 40 nanometros, siendo dichas partículas de sílice aptas para ligarse entre sí despuós de haber recubierto el agente fotocatalizador.
- 2Composición fotocatalítica segón la reivindicación 1, caracterizada porque el agente ligante estó exclusivamente constituido por una dispersion coloidal acuosa de dióxido de sílice (SiO 2 ).
- 3Composicióon fotocatalótica seguón una de las reivindicaciones 1 a 2, caracterizada porque el agente fotocatalizador es el TiO2 anatasa.
- 4Composicióon fotocatalótica seguón la reivindicacióon 3, caracterizada porque el dióametro de las partóculas de TiO2 estóa comprendido entre 10 y 30 nanóometros.
- 5Composición fotocatalítica segun una de las reivindicaciones 1 a 4, caracterizada porque comprende de 10 a 60 partes (en seco) de la dispersióon coloidal acuosa de dioóxido de sólice, estando el complemento a 100 partes constituido por TiO2.
- 6Composicioón fotocatalótica seguón la reivindicacióon 5, caracterizada porque comprende 50 partes de dióoxido de titanio y 50 partes de las dispersioón coloidal acuosa de dióoxido de sólice.
- 7Composicioón fotocatalótica seguón una de las reivindicaciones 1 a 6, caracterizada porque comprende ademas unas zeolitas modificadas con unos iones metalicos aptas para impedir el desarrollo de microorganismos y de mohos perjudiciales.
- 8Composicion fotocatalítica segun una de las reivindicaciones 1 a 7, caracterizada porque comprende ademóas carbóon activo.
- 9Procedimiento para la fabricacion de una composicion fotocatalítica segun una de las reivindicaciones 1 a 6, caracterizado porque bajo agitación, se mezcla el agente fotocatalizador en el ligante inorgaónico hasta la obtencioón de una suspensióon homogóenea.
- 10Procedimiento para la fabricacióon de una composicioón fotocatalótica seguón la reivindicacióon 7, caracterizado porque bajo agitacioón, se mezclan el agente fotocatalizador y las zeolitas modificadas con unos iones metóalicos en el ligante inorgóanico hasta la obtencioón de una suspensioón homogóenea.
- 11Procedimiento para la fabricacioón de una composicioón fotocatalótica seguón la reivindicacióon 8, caracterizado porque bajo agitacioón, se mezclan el agente fotocatalizador y el carboón activo hasta obtencioón de una suspensióon homogóenea.
- 12Utilización de la composición fotocatalítica objeto de una de las reivindicaciones 1 a 8 en forma de pintura.
- 13Medio filtrante que comprende un soporte recubierto, por lo menos en una de sus caras, por una capa de la composicióon fotocatalótica seguón una de las reivindicaciones 1 a 8.
- 14Medio filtrante seguón la reivindicacióon 13, caracterizado porque el soporte es un soporte fibroso.
- 15Medio filtrante seguón la reivindicacioón 13, caracterizado porque el soporte es un panel acuóstico.
- 16Medio filtrante seguón una de las reivindicaciones 13 a 15, caracterizado porque cuando una de las caras del soporte estaó recubierta por dicha composicióon fotocatalótica, la otra cara del soporte estaó recubierta por una segunda composicióon apta para destruir los olores que comprende un derivado del óacido undecilóenico.
- 17Medio filtrante seguón la reivindicacióon 16, caracterizado porque dicha segunda composicioón comprende ademóas dioctilsulfosuccinato apto para destruir los insectos de tipo aócaros.
- 18Medio filtrante seguón una de las reivindicaciones 13 a 17, caracterizado porque comprende ademaós un prefiltro en forma de un soporte recubierto por dicha segunda composicioón apta para destruir ES 2 167 114 T3 los olores que comprende un derivado de ácido undecilénico.
- 19Medio filtrante segán la reivindicacián 18, caracterizado porque dicha segunda composicián comprende ademas dioctilsulfosuccinato apto para destruir los insectos de tipo ácaros.
- 20Procedimiento para la fabricación de un medio filtrante segun una de las reivindicaciones 13 a 19, caracterizado porque se recubre el soporte de la composicion fotocatalítica segun una de las reivindicaciones 1 a 8 a razon de 5 a 40 g/m 2 de Tiü 2 .
- 21Procedimiento para la fabricacioán de un medio filtrante seguán una de las reivindicaciones 13 a 19, caracterizado porque dicha segunda composicioán se aplica a razoán de 2 g/m 2 sobre el soporte.
- 22Utilizacion de un medio filtrante segun una de las reivindicaciones 13 a 19, para el tratamiento del aire.
- 23Utilizacioán de un medio filtrante seguán una de las reivindicaciones 13 a 19, para el tratamiento de efluentes hquidos. NOTA INFORMATIVA:Conforme a la reserva del art. 167.2 del Convenio de Patentes Europeas (CPE) y a la Disposición Transitoria del RD 2424/1986, de 10 de octubre, relativo a la aplicación del Convenio de Patente Europea, las patentes europeas que designen a Espana y solicitadas antes del 7-10-1992, no producirán ningun efecto en Espana en la medida en que confieran proteccion a productos químicos y farmacéuticos como tales. Esta informacion no prejuzga que la patente esté o no incluida en la mencionada reserva.
Independent claims23
147 paragraphs in 10 sections, as filed
IS 2 167 114 T3
DESCRIPTION
Photocatalytic composition.
The present invention relates to a new photocatalytic composition, its manufacturing process and its use.
It also refers to a filter medium coated with this photocatalytic composition, as well as its manufacturing process and its use.
In the continuation of the description and in the claims, by "photocatalyst agent" is designated an agent capable of destroying the different orgone pollutants present in air or water and this, by photochemical reaction caused by the irradiation of ultraviolet rays. (UV). This chemical reaction is widely known by the term photocatalysis and is used for the treatment of air or water.
Schematically, the photocatalytic reaction begins by activating a solid semiconductor by UV radiation with a wavelength of less than 380 nanometers, which causes electronic changes within the semiconductor and leads, in the presence of air or water, to the creation of oxygenated radicals on the surface of the semiconductor. These radicals attack the organic compounds adsorbed on the semiconductor, and, by a succession of chemical reactions involving oxygen from the air or water, they degrade the organic compounds until the carbon in the carbon chains is completely transformed into carbon dioxide (CO<sub>2</sub>).
The photocatalytic reaction is capable of transforming, by the process described above, a large number of air pollutants, in particular NO<sub>X</sub>, NH<sub>3</sub>, H<sub>2</sub>S, CO, O<sub>3</sub>, moose with C<sub>2</sub>-C<sub>4</sub> chlorinated or not, chloromethane, iso-octane, benzene, toluene, xylene, isopropylbenzene, aliphatic alcohols saturated with C<sub>4</sub>-C<sub>4</sub>, methyl mercaptan, chlorophenol, nitrophenol, methylterthiobutyl ether, dimethoxymethane, aldehodes with C<sub>4</sub>-C<sub>4</sub>, acetone, formic acid, acetic acid, 2-methylpropanoic acid, dichloroacetyl chloride, dimethylformamide, trimethylamine, actonitrile and pyridine.
In proactivity, titanium dioxide TiO2 anatase is used as a solid semiconductor, that is, as a photocatalyst agent, which, activated by UV light, is electronically modified so as to lead to the formation of hydroxyl radicals or H * and oxygen. O * suitable to attack the orgaonic compounds adsorbed on the TiO2 degrading them until the organic carbon is completely transformed into carbon dioxide.
However, it is possible to use other photocatalytic agents such as, for example, those chosen from the group of metalic oxides, alkaline earth oxides, actinide oxides and rare earth oxides.
For the treatment of air and liquid fluents, it is necessary to fix the photocathetic compositions by means of binding agents on supports, in particular fibrous supports or glass fiber supports. In the continuation of the description and in the claims, this association is designated "support - photocatalytic composition" by the term "filter medium".
It has been proposed for a long time to use, as a binding agent, organic molecules of the type polyvinyl acetate, polyvinyl alcohol ...
It has been quickly verified that this use could not be satisfactory to the extent that the carbon chains of the binder were also subjected to the photocatalysis process and therefore degraded, so that the life span of the composition was therefore limited.
To solve this problem, various techniques have been proposed that consist of removing the carbon from the binder by calcination, in particular by the technique of fixing the catalyst by "Previously Made Titanium Powder (PMTP)" or also "Chemical Vapor Desposition (CVD)" , described in particular in the magazine "CATALYSIS TODAY", vol 39 No. 3 pages 221 and 222.
However, this type of technique has a number of drawbacks, such as increasing the duration and the cost of preparing the composition. In addition, and above all, the calcination, carried out at temperatures of the order of 1700<sup>or</sup> C, causes the formation of dust that makes the composition difficult to use.
IS 2 167 114 T3
To solve this problem, it has been proposed in document FR-A-2749777, to replace the organic binder by an inorganic binder consisting of an imogolite-type inorganic aluminosilicate polymer.
The photocatalytic composition described in this document is presented in the form of an aluminosilicate gel to which a colloidal solution of photocatalyst agent is added. The preparation time of the aluminosilicate gel is on the order of several days and requires a multitude of relatively complicated steps. A thixotropic gel transparent to solar radiation is obtained, which needs to be fluidized by stirring to allow a regular coating on a support.
More precisely, to make a filter medium, the gel obtained is applied to a support and after drying, an unspecified technique is followed. The different tests show that a destruction of pollutants of the order of 12 or 26% is obtained depending on the light source used (see example 3).
Although the photocatalytic composition described in this document has the advantage of being able to be applied on a support in a single layer, not only is the preparation of the composition very complicated but also leads to insufficient results.
In order to solve this problem, the documents JP-A-09/171801 and WO-A-97/00134 have been proposed to apply the photocatalytic composition as such on a support, by means of an adhesive layer. The adhesive layer is made up of a resin that can comprise, in certain embodiments, from 5 to 40% by weight of colloidal salice.
In other terms, this solution has the drawback, on the one hand, of increasing the number of stages necessary for the manufacture of the filter medium (application of two successive layers on the support), and on the other hand, using resins, by organic definitions. , liable to be consumed when the photocatalysis process takes place.
One of the problems that the invention proposes to solve is that of providing a simple photocatalytic composition to prepare from commercially available constituents, and capable of being applied directly to a support.
Another problem that the invention proposes to solve is to improve the adsorption capacity and the photocatalytic efficiency, that is, the performance of the photocatalyst agent.
To solve the problem of providing a composition that is simple to make and capable of being applied to a support in a single layer, the invention proposes a photocatalytic composition comprising at least one photocatalytic agent and one inorganic binding agent, characterized in that the binding agent inorganic comprises an aqueous colloidal dispersion of silicon dioxide (SiO<sub>2</sub>), said aqueous colloidal dispersion of silicon dioxide comprising silicon particles capable of bonding with each other after having coated the photocatalyst agent.
By "aqueous colloidal dispersion of silicon dioxide (SiO<sub>2</sub>) ”, Designates a dispersion of negatively charged, high specific surface amorphous silica particles in water. In practice, the specific surface of the salice particles is greater than 80 m<sup>2</sup>/ g, advantageously 100 m<sup>2</sup>/ g per particle size between 25 and 30 nano-meters. Likewise, it is greater than 300 m<sup>2</sup>/ g, advantageously 350 m<sup>2</sup>/ g for a particle size between 4 and 6 nanometers. Silica particles have OH groups and OH ions on their surface<sup>-</sup> that form a double electrical layer that thus confers self-ligating properties to said particles. As already mentioned, the silica particles are apt to bond with each other after having coated the particles with photocatalytic agents.
To solve the problem of improving the adsorption capacity and the photocatalytic efficiency of the composition, the binding agent is exclusively constituted by an aqueous colloidal dispersion of silica diaoxide (SiO2).
In fact, it has been totally surprising that the use of an aqueous colloidal dispersion of SiO2 of the type described above makes it possible to greatly improve the percentage of adsorption of the polluting substances on the photocatalyst agent as well as the yield of the photocatalysis, this being probably due to the self-ligating properties of the SiO2 particles.
IS 2 167 114 T3
According to a first characteristic of the invention, the SiÜ2 particles represent from 20 to 50% of the weight of the colloidal aqueous dispersion, advantageously 48% by weight.
For a concentration lower than 20%, the photocatalyst is less resistant to friction and turns into powder.
For a concentration greater than 50%, the photocatalyst agent loses its activity.
According to another characteristic of the invention, the silica dioxide particles that form the aqueous dispersion have a diameter comprised between 10 and 50 nanometers, advantageously between 20 and 30 nanometers.
Advantageously, titanium dioxide (TiÜ<sub>2</sub>) anatase alone.
However, the photocatalyst agent can also result from a mixture of various agents such as TiÜ<sub>2</sub>, cerium oxide, etc ...
To improve photocatalytic efficiency, titanium dioxide particles (TiÜ<sub>2</sub>) have a diameter between 10 and 30 nanometers.
Likewise, to obtain an optimal adsorption efficiency, the photocatalytic composition comprises from 10 to 60 parts (dry) of an aqueous colloidal dispersion of silica dioxide, the complement to 100 parts being constituted by TiÜ<sub>2</sub> anatase.
Advantageously, the photocatalytic composition comprises 50 parts of solid dioxide and 50 parts of anatase titanium dioxide.
According to another embodiment of the invention, in order to prevent the growth of harmful microorganisms and molds contained in the ambient air, the photocatalytic composition also comprises zeolites modified with metalic ions.
By "zeolite", a group of hydrated natural aluminosilicates of the alkali or alkaline earth metals is designated.
In proactivity, the metal ions are chosen from the group comprising silver, copper and zinc and are used at a rate of 1 to 3%. Advantageously, the zeolite is modified with 1.5% silver ions.
It has indeed been found that this type of composition made it possible to accelerate the destruction of microorganisms and molds contained in the ambient air, while destroying the organic pollutants originating from some odors, combining the properties of modified zeolites with those of the photocatalysis described above.
According to an advantageous embodiment of the invention, the photocatatic composition consists of (by weight):
• 30 to 50%, advantageously 47% of SiÜ<sub>2</sub> • 30 to 50%, advantageously 47% of TiÜ<sub>2</sub> anatase • 2 to 10% advantageously 6% zeolite with 2% silver.
According to another embodiment of the invention, in order to adsorb the organic molecules present in the pollution peaks, the photocatalytic composition also comprises active carbon.
In a known manner, activated carbon is present in the form of fibers or grains which have a high specific surface area, thus allowing the organo molecules to be adsorbed.
In this way, the photocatalytic composition that includes active carboon, acted on the ambient air in two times:
υ in principle, adsorption of the polluting agents present in the pollution peaks on the
ES 2 167 114 T3 activated carbon;
υ then photocatalysis that degrades the pollutant contained in the activated carbon, thus allowing the regeneration of said activated carbon.
In other words, the life span of this composition will be greatly increased relative to the life span of activated carbon alone.
According to an advantageous form of this embodiment, the photocatalytic composition consists of (by weight):
υ 10 to 40%, advantageously 25% of Tiü<sub>2</sub> anatase, υ 10 to 40%, advantageously 25% activated carbon, υ 40 to 60%, advantageously 50% Siü<sub>2</sub>
The invention also relates to the process for manufacturing the photocatalytic composition according to which, under stirring, the photocatalyst agent and, where appropriate, the zeolites modified with metal ions and / or activated carbon are introduced into the colloidal aqueous solid suspension until obtaining homogeneous suspension that can be applied directly on a support.
The invention therefore also relates to the use of the photocatalytic composition in the form of a paint.
The invention also relates to a filter medium. As already said, by "filter medium", the association support-photocatalytic composition is designated. In known manner, a filter medium can be composed of one or more treated supports.
Thus, the photocatalytic composition of the invention can be deposited on at least one of the faces of a support. It has indeed been found that, thanks to their self-binding properties, the Siü<sub>2</sub> not only did they bond together, covering the Tiü particles<sub>2</sub>, but were also linked to the support. Furthermore, and above all, a strong increase in the performance of photocatalysis is observed, this being probably due to the particular structure of the Siü particles.<sub>2</sub>, which allows to preserve a high porosity and a large specific surface of the layer after drying.
Contrary to the deposit of a composition transparent to UV rays described in document FR-A-2749777, the deposit made with the composition of the invention is opaque to UV rays while maintaining optimal efficacy, a property that can be used in some fields of application such as posters, banners, wallpapers.
On the other hand, various types of supports can be used, such as glass fibers, non-woven support and this, in a non-limiting way.
In another embodiment, the support is in the form of an aqueous panel.
By "water panel", the constituent plates of the double ceilings are designated in particular.
In practice, the plate is coated with the photocatalytic composition.
The natural convection produces a movement of cold air that goes from the lower part of the piece that, heating up, rises towards the upper part of the piece to roast it to come into contact with the constituent plates of the ceilings that, under incandescent or daylight , they trigger a photocatalytic reaction that leads to the destruction of the gases.
The support can also be a paper-type organic fibrous support. It has indeed been found that the use of the aqueous colloidal dispersion of Siü2 allowed to cover the organic fibers of the support, so that said support is not subjected to the reaction of photocataolysis and therefore deteriorated over time.
The use of the colloidal dispersion of Siü<sub>2</sub> On this type of support it therefore allows to increase the life span of the filter medium.
IS 2 167 114 T3
According to an advantageous embodiment of the invention, a single side of the filter medium support is coated with the photocatalytic composition of the invention, the other side being coated with a second composition capable of destroying odors that comprises a derivative of undecylenic acid.
Advantageously, the derivative of undecylenic acid is sodium undecylenate, or also methyl or ethyl undecylenate, and this is not limiting.
In order to destroy mite-like insects, said second composition also comprises dioctylsulfosuccinate.
It has indeed been found that this type of composition allows to combine and enhance several different actions, namely:
• that of the derivative of undecylenic acid that ensures the destruction of odors, in particular of the amines type, sulfur derivatives, etc ...
• Dioctylsulfosuccinate, which acts by destroying the keratin of mites.
In practice, said second composition contains (in dry weight):
• from 80 to 98%, advantageously 96% of sodium undecylenate, • from 2 to 20%, advantageously 4% of dioctyl sulphosuccinate
In a variant, in addition to the support coated with the photocatalytic composition, the filter medium comprises a prefilter in the form of a support coated with a composition capable of destroying odors and mite-type insects that comprises a derivative of undecylaenic acid and dioctylsulfosuccinate.
The invention also refers to the process of manufacturing a filter medium comprising a support on which the photocatalytic composition of the invention is applied at a rate of 5 to 40 g / m<sup>2</sup>, advantageously 20 g / m<sup>2</sup> From uncle<sub>2</sub>.
For a value less than 5 g / m<sup>2</sup>, the photocatalysis reaction is reduced taking into account the too small thickness of the layer of the photocatalytic composition on the support.
For a value greater than 40 g / m<sup>2</sup>, no increase in photocatalytic yield is observed.
In the embodiment according to which the filter medium has a support face or a pre-filter covered by a composition based on undecylaenic acid and sulfosuccinate, this coating is carried out at a rate of 2 g / m<sup>2</sup>.
Furthermore, the manufacturing process of the filtering medium of the invention has the advantage of being able to be carried out continuously, the coating being able to be carried out in particular by "size press", or any other traditional impregnation or coating process, which makes the process very simple with respect to the previous technique.
In the case of wallpapers or also of water-based panels, the composition of the invention can be in the form of a paint to be applied directly to the support.
These filter media can therefore be used for the treatment and purification of the air, but also for the treatment of liquid effluents.
The invention and the advantages that result from it will be better highlighted in the following examples of realizations with the support of the attached figure 1, which represents the reaction performance of the photocatalytic composition, object of the invention.
Example 1
The following experience shows the improvement of the adsorption capacity and the photocatalytic performance of the photocatalytic composition of the invention in comparison with a filter medium of the prior art.
IS 2 167 114 T3
The test consists of immersing a support disk coated by a photocatalytic composition in an isopropyl alcohol solution, and then subjecting the disk to the action of ultraviolet rays of wavelength less than 380 nanometers, for 90 minutes. Under the effect of UV rays, a part of the isopropyl alcohol is transformed into acetone and thus reveals the photocatalytic efficiency of titanium dioxide.
The disc is made up of a fibrous support covered with a photocatalytic composition made up of:
• 50 parts of binders • 50 parts Tiü<sub>2</sub>
Examples 1, 2, 3, 4 have been made with various types of Tiü<sub>2</sub> applied on the disc with a surface equal to 18 cm<sup>2</sup> at the rate of 4.5 to 17 g / m<sup>2</sup>. The inorganic binder used is a colloidal dispersion of Siü<sub>2</sub> marketed by NISSAN under the brand name "SNüWTEX 50".
Example 5 uses a filter medium commercialized by MATRIX in which the union of the Tiü<sub>2</sub> with the support it is carried out by calcination of the binding agent. The analyzes were carried out by gas chromatography.
The results are listed in the following table:
TABLE 1
<td></td><td>Example 1 Tiü<sub>2</sub> DT51<sup>1 </sup>16 g / m<sup>2</sup></td><td>Example 2 Tiü<sub>2</sub> REF2<sup>2 </sup>17 g / m<sup>2</sup></td><td>Example 3 Tiü2 REF2 4.5 g / m<sup>2</sup></td><td>Example 4 Tiü<sub>2</sub> P-25<sup>3</sup>12.5 g / m<sup>2</sup></td><td>Example 5 Filter medium Previous technique<sup>4</sup>2.88 g / m<sup>2</sup></td>
<td>Amount of acetone formed / ymol</td><td> 46</td><td> 69</td><td> 50</td><td> 71</td><td> 26,5</td>
1: DT 51®: Tiü<sub>2</sub> marketed by RHüDIA
2: REF2: Tiü<sub>2</sub> of specific surface equal to 75 m<sup>2</sup>/ g
3: marketed by DEGUSSA
4: marketed by MATRIX
It is found that the last disk generates the formation of a very low amount of acetone with respect to the photocatalytic composition of the invention. It is also found that a deposit of Tiü<sub>2</sub> between 4.5 g / m<sup>2</sup> and 12.5 g / m<sup>2</sup> (examples 3 and 4), allows to obtain a good photocatalytic efficiency.
Example 2
The reaction performance of various compositions according to the invention applied to a non-woven type support (reference 1045) manufactured by AHLSTRüM LYSTIL and perforated by the PERFüJET procedure has been calculated so as to improve through-flow rates (small pressure drop). The pollutant used is isobutane.
The composition contains two types of Tiü<sup>2</sup> different specific surface area respectively equal to 250 m<sup>2</sup>/ g (designated REF 1) and 75 m<sup>2</sup>/ g (REF 2).
The following table shows the set of essential parameters, namely the proportions of each of the constituents, the irradiated surface, the irradiation duration and the mean reaction limit, and the 10 or 20 g / m deposit.<sup>2</sup> by Tiü<sup>2</sup> (REF 1 or REF 2).
IS 2 167 114 T3
TABLE 3
<td></td><td>Binder * / TiO<sup>2 </sup>in dry parts</td><td>Surface cm<sup>2</sup></td><td>Duration of irradiation h</td><td>Yield of reaction% average</td>
<td>1A</td><td></td><td> 64,5</td><td> 6</td><td></td>
<td>REF 1</td><td> 20/80</td><td> 65,8</td><td> 6</td><td> 54,3</td>
<td>10 g / m<sup>2</sup></td><td></td><td> 65,8</td><td> 6</td><td></td>
<td>1 B</td><td></td><td> 67,4</td><td> 6</td><td></td>
<td>REF 2</td><td> 20/80</td><td> 67,5</td><td> 6</td><td> 75,38</td>
<td>10 g / m<sup>2</sup></td><td></td><td> 65,7</td><td> 6</td><td></td>
<td>1 C</td><td></td><td> 65,2</td><td> 6</td><td></td>
<td>REF 2</td><td> 20/80</td><td> 65,4</td><td> 6</td><td> 75,50</td>
<td>20 g / m<sup>2</sup></td><td></td><td> 65,7</td><td> 6</td><td></td>
<td>2 A</td><td></td><td> 64,5</td><td> 6</td><td></td>
<td>REF 1</td><td> 50/50</td><td> 64,8</td><td> 6</td><td> 44,58</td>
<td>10 g / m<sup>2</sup></td><td></td><td> 68,2</td><td> 6</td><td></td>
<td>2 A '</td><td></td><td> 67,8</td><td> 5</td><td></td>
<td>REF 1</td><td> 50/50</td><td> 67,8</td><td> 5</td><td> 36,40</td>
<td>10 g / m<sup>2</sup></td><td></td><td> 67,8</td><td> 5</td><td></td>
<td>2B</td><td></td><td> 66,2</td><td> 6</td><td></td>
<td>REF 2</td><td> 50/50</td><td> 65,1</td><td> 6</td><td> 88,52</td>
<td>10 g / m<sup>2</sup></td><td></td><td> 65,1</td><td> 6</td><td></td>
<td>2B '</td><td></td><td> 67,8</td><td> 5</td><td></td>
<td>REF 2</td><td> 50/50</td><td> 67,8</td><td> 5</td><td> 64,75</td>
<td>10 g / m<sup>2</sup></td><td></td><td> 67,8</td><td> 5</td><td></td>
<td>2 C</td><td></td><td> 66,2</td><td> 6</td><td></td>
<td>REF 2</td><td> 50/50</td><td> 66,2</td><td> 6</td><td> 81,53</td>
<td>20 g / m<sup>2</sup></td><td></td><td> 66,4</td><td> 6</td><td></td>
<td>3B</td><td></td><td> 67,2</td><td> 6</td><td></td>
<td>REF2</td><td> 50/50</td><td> 67,2</td><td> 6</td><td> 84,03</td>
<td>10 g / m<sup>2</sup></td><td></td><td> 67,2</td><td> 6</td><td></td>
<td>4B</td><td></td><td> 66,9</td><td> 6</td><td></td>
<td>REF 2</td><td> 50/50</td><td> 64,8</td><td> 6</td><td> 2,95</td>
<td>10 g / m<sup>2</sup></td><td></td><td> 66,9</td><td> 6</td><td></td>
<td></td><td></td><td></td><td>without C4H10</td><td></td>
* Snowtex 50 marketed by NISSAN
It is found that the best reaction yields are obtained with compositions of the invention containing 50 parts of the colloidal aqueous dispersion (SiO<sub>2</sub>) of silica and 50 parts of titanium dioxide REF 2.
It is also noted that the deposits of 10 g / m<sup>2</sup> From uncle<sub>2</sub> generate reaction yields higher than deposits of 20 g / m<sup>2</sup>, all other conditions being identical, which leads to reducing the cost of filter media.
IS 2 167 114 T3
When the test is carried out without the organic pollutant isobutane, the photocatalytic performance is practically zero, which is lagic. It can be estimated that the low value obtained in this case (2.95%) corresponds to the decomposition of parasitic organic matter. The figures in the table are therefore significant at around 3%.
In the attached figure 1, the reaction yield obtained by the photocatalytic compositions applied at a rate of 10 g / m is represented.<sup>2</sup> by TiÜ<sub>2</sub>, ie Examples 1A, 1B, 2A, 2A ', 2B, 2B', 3B and 4B.
Example 3
In this example, the efficacy of the photocatalytic composition of the invention that includes activated carbon has been evaluated.
For this, a photocatatic composition is applied on a non-woven type support (reference 1045) manufactured by AHLSTRÜM LYSTIL, and perforated by the PeRfüJET procedure.
The photocatatic composition is made up of:
υ 25% of TiÜ<sub>2</sub> of specific surface equal to 250 m<sup>2</sup>/ g υ 25% activated carbon with a specific surface area equal to 900 m<sup>2</sup>/ g and marketed by CECA υ 50% by weight of SiÜ<sub>2</sub> (Snowtex 50).
The medium irradiated with methane at a flow rate of 3.4 ml / min, the pollutant content being equal to 281 ppm, with or without saturation phases in the dark.
The results obtained in equilibrium under UV are identical whether the medium has been saturated or not.
Is obtained:
υ an amount of methanol equal to 22.3 micromoles per hour and per gram υ an amount of carbon dioxide (CÜ<sub>2</sub>) equal to 8.65 micromoles per hour and per gram.
The percentage of mineralization, that is, of transformation of the polluting agent into CÜ2 is 30%.
The carbon balance, which results from the degradation of methanol in its volatile product, is equal to 56%.
The advantages of the invention stand out well from the description. In particular, the great adsorption capacity and remarkable efficiency of TiÜ2 will be observed when it is mixed with a colloidal aqueous silica dispersion.
The simplification of the manufacturing process of the filter medium will also be observed, in particular resorting to continuous impregnation or coating techniques, in particular by "Size Press".
Contents10
1 sheet
Sheet 1
21 members in 11 offices
Priority claims5
| Document | Office | Kind | Date |
|---|---|---|---|
| 19980004401 | France | – | |
| 9804401 | France | A | |
| 9804401 | France | A | |
| 99910468 | – | – | – |
| FR19980004401 | – | – | – |
Members21
| Document | Office | Kind | |
|---|---|---|---|
| FR2776944A1 | France | A1 | |
| CA2324909A1 | Canada | A1 | |
| WO9951345A1 | World Intellectual Property Organization (WIPO) | A1 | |
| AU2941299A | Australia | A | |
| FR2776944B1 | France | B1 | |
| EP1069950A1 | European Patent Office (EPO) | A1 | |
| AU735798B2 | Australia | B2 | |
| EP1069950B1 | European Patent Office (EPO) | B1 | |
| AT210502T | Austria | T | |
| ATE210502T1 | Austria | T1 | |
| DE69900603D1 | Germany | D1 | |
| JP2002510717A | Japan | A | |
| PT1069950E | Portugal | E | |
| ES2167114T3This record | Spain | T3 | |
| DE69900603T2 | Germany | T2 | |
| US2004204314A1 | United States of America | A1 | |
| US6878191B2 | United States of America | B2 | |
| US6906001B1 | United States of America | B1 | |
| CA2324909C | Canada | C | |
| JP2008229624A | Japan | A | |
| JP4256070B2 | Japan | B2 |
Numbers
- Publication
- 2167114
- Publication, DOCDB
- 2167114
- Publication, EPODOC
- ES2167114T
- Application
- 99910468
- Application, DOCDB
- 99910468
- Application, EPODOC
- ES19990910468T
Titles2
- Spanish
- Composición fotocatalítica.
- English
- PHOTOCATALYTICAL COMPOSITION.
Classification
- CPC, 2
- B01J35/39
- Y02W10/37
- IPC, 6
- A61L9 00
- A61L9 01
- B01D39 14
- B01J21 08
- B01J35 00
- C09D1 00