Filter element with surface filtration coat

FIELD: process engineering.

SUBSTANCE: invention relates to filtration. Filter element 2 features through pores and surface filtration porous coat 10 which has: (a) first component consisting of particles 12 and/or fibers 22; (b) inorganic binding component (14, 24) to bind particles 12 and/or fibers 22 of first component; (c) glue (16, 26) to joint porous coat 10 to remaining filter element section; (d) second component (18, 28) acting as anti-adhesion component to ease adhesion of filtered material on porous coat and cleaning of filter element.

EFFECT: possibility to be used at higher temperatures, higher chemical stability.

16 cl, 2 dwg

 

The invention relates to possess intrinsic stability of the filter element with through pores and porous surface of the filter at its inlet surface.

Such filter elements are known formed with a number of different surfaces.

The basis of the invention lies in the task of creating a filter element with a coating for surface filtration, which is also applicable to high temperatures and/or increased stability against chemical attack.

To address this problem, the coating of the filter element is:

(a) the first component of the particles and/or fibers;

(b) inorganic binder component, which binds the particles and/or fibers of the first component;

(c) adhesive through which the porous coating is attached to the remainder of the filter element;

(d) and the second component, which is as anti-adhesion component weakens the adhesion of the filtered material on the porous coating and facilitates the cleansing of the filtering element.

Binding cover with the remaining filter element should not be exclusively due to the glue, but the glue is substantially participates in the implementation of this binding. On the other hand, the adhesive may optionally be included in combination with each other particles and/Revolucion the first component. Glue is increasing elasticity action to cover for the transition between the main body of the filter element and cover.

The preferred particles for the first component are particles of diatomaceous earth, zeolite particles, particles polyvinylpyrolidone and mixtures of them; among them are highly preferred particles of diatomaceous earth. The preferred fiber for the first component is a ceramic fiber. Mentioned preferred materials should not be 100% of the first component; it is sufficient if the first component substantially consists of one or more of the materials mentioned as preferred. On the other hand, it is preferable that the first component consisted essentially of only one mentioned preferred material or mixture of them. An alternative, but preferred is a mixture of ceramic fibers and one mentioned preferred form of particles or more preferred these species of particles.

The binder component may contain liquid glass or consist of it. But, of course, preferably, if the binder component is liquid glass. The binder component is preferably based on the ash, particularly preferably water ash. The connecting component includes a preference for the equipment sewn SiO 2or derived from crosslinked SiO2or sewn TiO2or derived from crosslinked TiO2or sewn ZrO2or derived from crosslinked ZrO2or a mixture of several of the aforementioned materials; these materials give the result of adhesion forces primary physical nature in the finished coating. Stitched SiO2especially preferred. Also the binder component must not be on 100% of the one mentioned as the preferred material or of a mixture of several of these materials. However, preferably, if the binder component consists essentially of one referred to as the preferred material or a mixture of several such materials. Derived from the SiO2means material that contains, in addition to silicon atoms and oxygen atoms, more organic residues. Similarly, when TiO2and ZrO2.

Mainly adhesive is an organic dispersion adhesive. Aqueous dispersions are particularly preferred.

Mainly anti-adhesion component is polytetrafluoroethylene (hereinafter briefly indicated PTFE), and/or polyethylene (hereinafter briefly PE), and/or silicone. PTFE is highly preferred. Highly preferred is the case that the anti-adhesion component consists essentially t is like PTFE. Particularly advantageous form of execution of the invention provides that the coating is applied by way of a Sol-gel.

The next best form of the invention consists in that when the coating of the first component and the adhesive component was present in a weight ratio of from 2:1 to 1:20, preferably from 1.5:1 to 1:15, more preferred from 1.5:1 to 1:10, more preferably from 1.5:1 to 1:5, more preferably from 1.5:1 to 1:2. It matters more is preferable for the particles of the first component, and more preferably for diatomaceous earth as the first component, and PTFE as anti-adhesion component.

Another, the following advantageous form of execution of the invention consists in that the coating (essentially only) contain diatomaceous earth as the first component and (essentially only) PTFE as anti-adhesion component in a weight ratio of from 1:1 to 1:2.

The main body of the filter element, i.e. under floor main frame of the filter element, preferably made of mutually related, particularly preferably of sintered particles of plastic. Particularly advantageous particles of polyethylene.

The variant of the filter element according to the invention, in which the available particles as the first component of the coating, can be used especially vygodnada filtering liquids or to separate oil mist from the gas stream. In a special way watch here for filtering lubricating and cooling materials; cutting materials are oily liquid or emulsion lubricants, in particular, in water that are introduced by mechanical and accordingly grinding, respectively, cutting and correspondingly different shooting (for example, electrical discharge machining) process components. Lubricating and cooling the material, as a rule, is pumped into the circuit and contains, if he leaves the place machining, machined, cut or shot particles of the machined workpiece. They should be filtered out, while lubricating and cooling the material is not deflected back into the path to the workpiece. The filtering is preferably carried out by means of the filter element according to the invention, which is simply immersed in a bath of lubricating and cooling the material. The filtered particles are still hanging on the outer surface of the filter element on the floor, filtered lubricating and cooling the material is drawn from the inner part of the filter element. For periodic cleaning of the filter element circulation pump briefly interrupted at the appropriate period of time and replaced by intermittent flow of fluid from the cleaned lubricating and cooling the material in the opposite directed and, consequently accumulated on the outside cover of the filtered particles fall down into the tub with lubricating and cooling the material and, for example, can be removed therefrom by means of a device for the removal of the sludge.

Based on the ideas of the invention it is possible to produce filter elements, which essentially is completely filtered from the liquid particles larger than 5 μm, more preferred larger than 3 μm. If coolant is achieved that the accuracy of machining is very high as to the place of processing flows particularly clean lubricant-coolant. Filter elements according to the invention can be produced for filtering gas, particles larger than 3 μm, more preferably larger than 1 μm, essentially is completely filtered out. The preferred average pore size of the coating lies in the range from 0.5 to 10 μm, more preferably from 1 to 8 μm, more preferably from 1.5 to 7 μm.

The variant of the filter element according to the invention, in which (hereinafter prevails or substantially only) are available as the first component of the coating of the fiber can be used particularly advantageously for gas filtration. But also and filter elements according to the invention, in which (hereinafter transformed is present or essentially the only) are available as the first component particles or a mixture of particles and fibers as the first component of the coating, can be used for gas filtration.

In General, it can be used according to the invention the filter elements are particularly advantageous in situations where the application requires stability at elevated temperatures and/or stability during the chemical exposure. The filter element may be designed in such a way that it can withstand continuous operating temperatures up to 180°C, or can be made so that it can withstand continuous operating temperatures up to 150°C, or can be made so that it can withstand continuous temperatures up to 120°C. Chemical exposure exists, for example, in the already mentioned coolant, another use case with chemical exposure is filtering exhaust gases. As use cases with resistant named filters for exhaust gases, filters for separating the product from the gas stream (for example, spray drying, spray drying the food industry) and regeneration of the material from the gas stream (for example, the catalyst in reactor pseudoainhum layer).

Instead of "first component" you can say also "the main ingredient". The second component takes more helper function, as it weakens the adhesion of the filtered material on the porous coating and obligatoriska filter element.

In an advantageous form of execution of the filter element according to the invention is a filtering element which is able to be purified, for example, pulsed reverse current. To do this well, if the main body has so much elasticity that its walls when the pulse cleaning a little deformed. Due to the properties of the adhesive, increasing elasticity, the coating may also undergo such deformation without detachment.

The invention and the preferred form of carrying out the invention are explained in more detail in the following by means of examples of forms of execution.

Figure 1 shows in section a sector of the filter element.

Figure 2 shows in section a sector of the filter element of another form of execution.

At presents as a sector in figure 1 filter element 2, the main body consists of particles 4 polyethylene, which are sintered in the contact 6. Pores 8 between particles 4 have an average size of, for example, from 10 to 60 μm. The main body may, for example, be a direct figure of a hollow flat parallelepiped with passing zigzag walls with two large sides and one open side facing downward flow of purified liquid or sewage gas. The alternative is a form of a hollow cylinder with a wavy outer side and an open front side.

Floor 10 filter the element consists essentially of particles 12 diatomaceous earth, which are connected through stitched SiO214 and is connected via organic dispersion adhesive 16 in their places of contact with particles 4 polyethylene main body, and the particles 18 PTFE. Particles 12 diatomaceous earth so small that the pores between diameter less than 3 microns. In the manufacture of the filter element 2 of figure 1 is made first main body and then on its inlet surface-coated or flowable consistency, or in the thick consistency to viscous consistency, for example, by spraying, rolling, brushing and so on.

The applied coating weight consists essentially of particles of diatomaceous earth, SiO2-sols, PTFE particles, organic dispersion glue, water and a small amount of surfactant(PVA), humectants or antifoam. All these components are accessible without problems on the market. The coating weight is stable emulsion. After coating weight of the coating takes place, as a rule, when applying several high temperature Sol-gel reaction, and finally, after evaporation of all water education coverage in the solid aggregate state. When the Sol-gel reaction and evaporation of water occurs stitching SiO2phase and consequently the binding of the diatomaceous earth particles among themselves.

The weight ratio of diatomaceous earth to Pthalic for particularly good results in the range from 1:1 to 1:2.

Presented in the sector in figure 2, the filter element 2 differs from the filter element 2 according to figure 1 coated 10. Now the finished coating 10 is essentially composed of a ceramic fibers 22 made of SiO224, the organic dispersion adhesive 26 and PTFE particles 28. The diatomaceous earth particles 12 are also available in smaller mass than in figure 1. For what concerns the weight of the coating applied in the state have a value of further statements made according to figure 1 in connection with the example of manufacture (the following components, consistency and so on).

The pores between the ceramic fibers 22 have essentially the same size as the pores between the particles of diatomaceous earth 12 in the form of execution according to Fig 1. Ceramic fiber 22 usually have a diameter less than 1 μm and a length of from 10 to 30 microns; they are chemically are usually essentially of SiO2/Al2O3.

Diatomaceous earth is the chassis designation for the material, which is usually from 70 to 90% of amorphous silicic acid and from 3 to 12% of water.

In the case of silicone as the adhesive component of the drawings would be essentially unchanged. In the case of PE as anti-adhesion component of the particle PE would be more than indicated PTFE particles 18 or 28, and would be, for example, the size of which is slightly less than the particle size of the diatomaceous earth 12. In the case of a Jew who CSOs glass as the inorganic binder component of the drawings would be essentially unchanged.

1. With its own stability filter element (2) with through pores and the porous coating (10) for the surface of the filter at its inlet surface, where the coating (10) includes:
(a) the first component of the particles (12) and/or fibers (22);
(b) inorganic binder component (14; 24), which associates with each other the particles (12) and/or fiber (22) of the first component;
(c) adhesive (16; 26), through which the porous layer (10) is attached to the remainder of the filter element;
(d) and the second component (18; 28), which is as anti-adhesion component weakens the adhesion of the filtered material on the porous coating and facilitates the cleansing of the filtering element.

2. The filter element according to claim 1, characterized in that the first component is selected from the group which consists of particles (12) of diatomaceous earth, zeolite particles, particles polyvinylpyrolidone and mixtures of them.

3. The filter element according to claim 2, characterized in that the first component contains particles (12) of diatomaceous earth.

4. The filter element according to claim 1, characterized in that the first component contains ceramic fiber (22).

5. The filter element according to claim 1, wherein the adhesive is an organic dispersion adhesive (16; 26).

6. The filter element according to claim 1, wherein the adhesive component is in tetrafluorethylene (PTFE) (18; 28), and/or polyethylene (PE), and/or silicone.

7. The filter element according to claim 1, characterized in that the coating (10) contains diatomaceous earth (12) as a first component and PTFE (18; 28) as the adhesive component in a mass ratio of 1:1-1:2.

8. The filter element according to claim 1, characterized in that the coating (10) the main body of the filter element (2) formed of mutually related particles (4) plastic.

9. The filter element according to any one of claims 1 to 8, characterized in that the binder component selected from the group consisting of crosslinked SiO2(14; 24), derived from crosslinked SiO2sewn TiO2or derived from crosslinked TiO2made ZrO2derived from crosslinked ZrO2and mixtures of them.

10. The filter element according to claim 9, characterized in that the binder component contains sewn SiO2(14; 24).

11. The filter element according to claim 9, characterized in that the coating (10) deposited by Sol-gel method.

12. Applying a filter element according to any one of claims 1 to 11, which are available particles (12) as the first component of the coating (10)for filtering liquids or to separate oil mist.

13. Use 12 for filtering coolant.

14. The application of item 12 or 13, in which particles smaller than 5 microns will be essentially full of the stew filtered.

15. Applying a filter element according to any one of claims 1 to 11, which are available particles (12) and/or fiber (22) as the first component of the coating (10), for filtering the gas.

16. The application indicated in paragraph 15, by which foreign particles larger than 2 microns will be basically completely filtered.



 

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1 tbl

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10 cl, 6 dwg

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SUBSTANCE: invention relates to field of water purification by filtering. Claimed is filter and filtering material for portable water purification. Filter contains body having input and output openings, filtering material, which is located inside the body, filtering material being formed by multitude of microporous activated coal particles from approximately 25% to 75% by weight and multitude of mesoporous activated coal filtering particles from approximately 25% to 75% by weight. Preferably some of mesoporous activated coal particles are covered with cation polymer and silver of silver-connecting material.

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17 cl, 1 dwg, 1 tbl

FIELD: technological processes, filters.

SUBSTANCE: invention is related to the field of melt metal filtering. Precursor of ceramic material and ceramic filter made of it are proposed, comprising 35-70 wt % of fire resistant aluminium silicate; 10-30 wt % of colloid silicon dioxide; up to 2 wt % of modified bentonite; up to 35 wt % of carbon white. Precursor also contains water and possibly cellulating agent up to 10 wt % in the form of hollow spheres. Method for melt cast iron filtering is also described.

EFFECT: invention provides for production of strong foamed filter based on mullite and having improved characteristics in cast iron filtration.

43 cl, 5 tbl, 5 ex, 10 dwg

FIELD: chemistry.

SUBSTANCE: invention relates to inorganic chemistry and can be used to make membranes. A method is proposed, in which a layer of wet metal oxide gel is formed on the surface of a coarse-pored substrate, where the metal oxide is selected from oxides of titanium, zirconium, aluminium and silicon. The layer is dried and the gel is converted to the corresponding sol which is subsequently dried to form a porous structure, after which a cladding oxide layer is deposited on the formed porous structure by treating the structure with concentrated solution of salts selected from aluminium nitrate, zirconium hydroxonitrate, nickel nitrate or their mixture, in the presence of a buffer additive of a nitrate of an alkali metal with decomposition temperature higher than decomposition temperature of the salt selected for formation of the cladding oxide. Further, thermal treatment is carried out at 350-600°C, after which the obtained material is washed and dried.

EFFECT: method provides a flawless porous structure of a selective layer of membrane material.

4 cl, 2 tbl

FIELD: process engineering.

SUBSTANCE: invention relates to filtration with the help of fibrous filtration materials. Filtration materials are made in the form of thermally glued sheet and comprise compositions of filtration fibers, two-component binder fiber and auxiliary additives and components. Filtration materials are used in filtration sets to be placed in low-viscosity fluid medium to remove particles therefrom.

EFFECT: high-efficiency material for filtration of fluid media.

62 cl, 10 ex

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