Filtering material, the filter for purification of gasses and aerosol and the method of the filtering material production

FIELD: natural gas industry; petrochemical industry; oil-producing industry; other branches of industry; methods of production of filtering materials and the filters for purification of gases and aerosols.

SUBSTANCE: the invention offers the filtering material made out of the polysulfone fibers with different diameter of the fibers produced by electromolding from the solution in the organic solvent with addition of an electrolyte; and the frame design filter supplied with the produced material having the density of 30 - 50 g/m2. The invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.

EFFECT: the invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.

5 cl, 1 tbl, 1 dwg

 

The invention relates to the field of production of filter materials microfiber and their use for fine purification of air and gases from the dispersed particles, including radioactive aerosols.

Known sorption-filtering material for bacterial filters of fibers policyportal or polysulfone based on bis-phenol a and 4,4-dichlorophenylamino, or poly-2,6-dimethylferrocene, or poly-2,6-diphenylvinylene, or polydiphenylenphthalide, or polyoxyethylenated, in which the angle of misorientation of the macromolecules in the fiber is not more than 30°, the fiber diameter of 0.1-10 μm and a total porosity of about 80 to 98%.

The method of obtaining this material includes forming electrostatic fibrous nonwoven material from a solution of polymer in organic solvent from the group of ethylene dichloride, cyclohexanone, trichloroethylene, methyl ethyl ketone dynamic solution viscosity of 0.1-30 PZ, the conductivity of a solution of 10-4-10-7Ω-1·cm-1and flow rate of solution of 10-5-10-1cm3/s per capillary (EN 2055632, 10.09.96).

The drawback is the scarcity of raw materials and insufficient efficiency of trapping of aerosols.

Also known composition to obtain a filter material by electrostatic molding fiber containing floor is sulfon and an organic solvent, where as polysulfone use policresulen, and as the organic solvent cyclohexanone or a mixture of dichloroethane in the following ratio, wt.%:

policresulen20,5-25,0
cyclohexanone or a mixture of dichloroethane15,9-75,0,

the content of dichloroethane in the composition should not exceed the 63.6 wt.% (EN 2045996, 20.10.95).

A known material can withstand sterilization by direct steam with a temperature of 143° over 100 cycles (1 cycle 45 min), i.e., the sample does not shrink, slightly increases aerodynamic drag compared to the original, and the overshoot factor for particles 0.3 microns does not exceed 1·10-2%. However, such characteristics are insufficient for certain fields of use.

Known aerosol filter in the housing which is located filter elements made of zig-zag folded filter material located between the folds of the separators. The filter elements are sequentially installed in the housing and made of layers of fibrous filter material of different density, with the first stream of air pollution layer of filter material manufactured by the flax from krupnorogatogo material with a size of 5-10 μm fibers with a low packing density of the fibers is not more than 0.04, and the second of the fine material with the size of the fibers of 0.2-0.4 µm with a high packing density of the fibers is not greater than 0.25.

As the fibrous material preferably used fiberglass (EN 2192916, 20.11.2002).

The disadvantage of this filter is its lack of resistance due to the applied binder fiber substances.

The closest in technical essence and the achieved result is a filter material made of polysulfone fibers with a fiber diameter of 1-8 μm and weighing 25-35 g/cm2frame filter on the basis of this material, as well as the method of obtaining this filter material through electrostatic spinning of fibers from the polysulfone-solvent-electrolyte described in the monograph Y.N. Filatov "Electropermanent fibrous materials (EFV-process)): Oil and gas, 1997, str, 201, 191, 257.

The lack of material and accordingly the filter based on it is insufficient efficiency of trapping of aerosols.

The present invention is to improve the heat resistance of the filter material and the efficiency of Aero-capture systems at stand design aerosol filter.

The problem is solved by the filter material containing fibers of polysulfone obtained by electrically bonding staticheskogo formation from a solution, he is made from a mixture of fibers with a diameter of 0.1-0.5 μm and a diameter of 5-10 μm in their mass ratio(1:25)-(1:5) respectively.

Preferably, the material is made in the form of nonwoven fabric having at least one side of the protective layer of glued polysulfone fibers with a diameter of 5-10 microns.

The problem is solved also by the filter for cleaning of gases from aerosols, comprising a housing with separators and framework element having parallel base and provided with a fibrous filter material as described above, and having a total mass density of 30-50 g/m2.

The problem is solved also described a method of obtaining a filter material through electrostatic spinning of fibers from the polysulfone-solvent-electrolyte in which the electrode precipitated mixture polysulfone fibers with a diameter of 0.1-0.5 μm and a diameter of 5-10 μm in their mass ratio(1:25)-(1:5) respectively.

Preferably, the molding is carried out from a solution containing 5-25 wt.% polysulfone in a solvent selected from the range: dichloroethane, cyclohexanone, butyl acetate, ethyl acetate, dimethylformamide and electrolytic additive in an amount of 0.01 to 0.2% by weight of polysulfone, selected from the halides of tetraethylammonium and tetrabutylammonium.

The material on which heme essential features described above when it is used provides a high collection efficiency of aerosol particles and has a temperature resistance up to 160° C.

When you exit the stated intervals fibers with the stated diameters or reduced filtration efficiency, or not achieved increased resistance.

Below are examples of the preparation and characterization of the obtained materials.

Example 1.

Prepare a 15% solution of polysulfone in EDC with the addition of tetrabutylammonium iodite 0.01 wt.% with a viscosity of 7 PZ and electrical conductivity 5·10-6Ω-1·cm-1to obtain fibers with a size of 7 microns.

Prepare 17 wt.% solution of polysulfone in CGN with the addition of tetrabutylammonium iodite 0.02 wt.% with a viscosity of 3 PZ and electrical conductivity 1-10-5Ω-1·cm-1to obtain fibers with a size of 0.3 microns.

These solutions are forced through the dispensers are placed in the field of high voltage 80 kV, and produced by the method of electrotorture on the precipitation electrode fibrous filter material with a mixture of fibers of 0.3 and 7 μm with a mass ratio of 1/7.

The resulting material can withstand a temperature of 160°C for 10 hours, with filtration efficiency for particles of 0.3 μm in a discharged state is 99.99% in hydrodynamic resistance 52 PA and linear filtration rate of 1 cm/S.

Examples of other declared parameters are summarized in table 1.

Example 2.

The material was obtained in the same way, CA is in example 1, but first on the collecting electrode is coated with the protective layer of the coated fibers of the same diameter, due to the proximity of the electrodes to a distance of 12 cm

Then equip the material received filter using frame elements and separators. In the drawing shown: 1 - body, 2 - framework element, 3 - fiber filter element.

The material tested in the claimed design of the aerosol filter and showed the following results: temperature 160°With, the collection efficiency in a discharged state at the most penetrating particle size 0.3 microns - to 99.99%, the hydrodynamic resistance of 60 PA at a gas flow velocity of 1 cm/S.

ExampleThe concentration of polysulfone, wt.%The concentration of the solvent, wt.%The diameter of the fibers, mcmThe mass ratio of thick/thinEfficiency
EDCButyl acetateEthyl-acetateCHNDMF
115

17
85

-
-

-
-

-
-

83
-

-
7

0,3
24/199,99
214

16
-

-
86

-
-

-
-

-
-

84
8

0,2
15/199,999
316

18
-

-
-

-
84

-
-

-
-

82
9

0,1
5/199,9999
The placeholder20,563,6--15,9-0,7-99,9

1. The filter material containing fibers of polysulfone obtained by electrostatic formation from a solution, characterized in that it is made from a mixture of fibers with a diameter of 0.1-0.5 μm and a diameter of 5-10 μm in their mass ratio(1:25)-(1:5) respectively.

2. The filter material according to claim 1, characterized in that it is made in the form of nonwoven fabric having at least one side of the protective layer of glued polysulfone fibers with a diameter of 5-10 microns.

3. The filter for cleaning of gases from aerosols, comprising a housing with separators and framework element having parallel base and provided with a fibrous filter material, characterized in that it contains a filter material, characterized in the claims 1 and 2, with a total mass density of 30-50 g/m2.

4. A method of obtaining a filter material, comprising forming electrostatic microfiber system polysulfone-solvent-electrolyte, characterized in that the electrode precipitated mixture polysulfone fibers with a diameter of 0.1-0.5 μm and a diameter of 5-10 μm in their mass ratio(1:25)-(1:5) respectively.

5. The method according to claim 4, characterized in that the molding is carried out from a solution containing 5-25 wt.% polysulfone in a solvent selected from the range: dichloroethane, cyclohexanone, butyl acetate, ethyl acetate, dimethylformamide and electrolytic additive in an amount of 0.01 to 0.2% by weight of polysulfone, selected from the halides of tetraethylammonium and tetrabutylammonium.



 

Same patents:

FIELD: methods of production of filtering materials.

SUBSTANCE: the invention is pertaining to the methods of production of filtering materials, in particular, to the method of production of the filtering fibrous materials, which may be used in a means of individual protection. The filtering fibrous material is produced by an electrostatic formation of a non-woven fibrous material from a working polymeric fiber-forming solution with dynamic viscosity of 1-30P, electrical conduction of 10-4-10-7 ohm-1 cm-1 in an electrostatic field at a potential difference from 10 up to 150 kV. The solution contains in the capacity of the polymer from 8.9 up to 24.6 mass % of styrene copolymer with 5.2-30.4 mass of acrylonitrile or triple styrene copolymer with 5.2-30.4 mass of acrylonitrile and 3.7-42.1 mass % of methyl methacrylate. As a dissolvent they use ethyl acetate, or butyl acetate either their mixture. The solution in addition contains high-molecular polymethyl methacrylate, a distilled water, the lowest alcohol taken from the group ethyl alcohol, methyl alcohol or isopropyl alcohol, at the following contents of ingredients of the polymeric fiber-forming solution, in mass %: polymeric compound - 8.9-24.6; high-molecular polymethyl methacrylate - 0.011-0.02; distilled water - 0.01-0.1; the lowest alcohol - 17-28; dissolvent - the rest. The efflux of the working polymeric fiber-forming solution is exercised at the volumetric speed of 0.1 up to 6 cm3 /minute. Feeding of the working polymeric fiber-forming solution is conducted from the space interval of 12-42 cm beginning from the point of its coming out from the batching device up to the settling surface. The produced filtering fibrous material contains a technological and a working layers made out of the polymeric fibrous material produced by the above described method. The technological layer material has the surface density of 1-3 g/m2 and is made out of fibers of 3-5 microns diameter. The working layer material is made out of fibers of 1.5-3 microns diameter. The double-layer material has the surface density of 32-38 g/m2, the standard resistance of 0.8-1.2 mm of the water column and the skip coefficient of no less than 95 %. The invention ensures an improved quality of the filtering material due to an increase of efficiency of penetration of fragments with a diameter of 0.3 microns at the standard resistance of 1.0 mm of the water column.

EFFECT: the invention ensures an improved quality of the filtering material, an increased efficiency of penetration of fragments with a diameter of parts of microns at the standard resistance of 1 mm of the water column.

4 cl, 2 ex

FIELD: chemical industry; oil refining industry and other industries.

SUBSTANCE: the invention is pertaining to production of materials for the filtering water-separating elements used in devices for purification of organic fluids, predominantly, hydrocarbon fuels, oils, oil products from the emulsified water and mechanical impurities, and may be used for purification of aircraft and car fuels in chemical industry, oil refining industry and other industries. The porous reinforced material is produced out of a permeable in all directions polymeric material with a side-porous deep structure having a total porosity of no less than 50 % with the sizes of the elementary pores, predominantly, of 10 - 200 microns. At that the porous reinforced material is formed out of a framed material having filaments or fibers with a diameter, predominantly, of 5 - 400 microns, and an arranged between the above mentioned filaments or fibers filler manufactured out of a porous polyvinyl formal produced by the method of a dew-point structurization with the thermal treatment of a homogenized in water composition containing at least polyvinyl alcohol and aldehyde. The element for the screen-water-separator contains a filtering-coagulating septum embraced by a perforated shell rings and limiting from above and from below covers. At that the septum is made multilayered out of a sheet manufactured out of the above porous reinforced material. The technical result consists in an increased effectiveness of purification of fuels (jet engine fuels and diesel fuels) and the gaseous oil products from water, and also asphalt-resinous and sulfur-containing materials, an increased service life and productivity of the filtering screens based on the indicated filtering-coagulating material.

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13 cl, 3 ex, 5 tbl, 4 dwg

FIELD: polymer materials and gas treatment.

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1 tbl

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1 dwg, 1 tbl

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2 cl, 2 dwg

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SUBSTANCE: the invention is pertinent to fine-fiber filtering materials used for individual means of protection of respiratory organs. The invention offers a protection material, a means of protection containing the offered material and a method of production of the fibrous material providing for electrostatic forming of the fibrous material from a solution of styrene copolymer with acrylonitrile in an organic solvent at the presence of electrostatic additives of bromide or iodide salts of tetraethyl- or tetrabutyl-ammonium. At that a solution containing an additive of a high-molecular methylmethacrylate in amount of 0.001-0.01 mass % in the capacity of dissolvent is used a mixture of ethyl acetate with butyl acetate at their mass ratio in the solution from 1/9 up to 9/1 accordingly. The invention allows to produce a material with improved mechanical characteristics and to provide stability of the production process.

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5 cl, 2 tbl, 1 ex

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12 cl, 2 dwg, 6 tbl, 26 ex

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19 cl, 16 tbl, 19 dwg, 23 ex

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EFFECT: the invention improves the capability of filtering oily aerosols.

19 cl, 16 tbl, 19 dwg, 23 ex

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12 cl, 2 dwg, 6 tbl, 26 ex

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EFFECT: the invention ensures production of the material with improved mechanical characteristics and stability of the production process.

5 cl, 2 tbl, 1 ex

FIELD: fine filtration of air; cleaning ventilation emissions from oil mist; cleaning air in venting pipe lines of gas-transfer unit oil tanks.

SUBSTANCE: proposed filter includes filter element with filter medium made from coarse and fine fibers laid in between outer and inner cylinders, cover and bottom. Filter medium is made from longitudinal and transversal oil-resistant synthetic (polypropylene) fibers; ratio of mass of longitudinal and transversal fibers is equal to (6-8) : 1 and ratio of diameters of thin and coarse fibers is equal to (0.5-1) : 10.

EFFECT: enhanced efficiency of cleaning at considerable increase of service life, oil return coefficient; enhanced ecological safety around compressor stations.

2 cl, 2 dwg

FIELD: filtering materials for liquid and gaseous fluids.

SUBSTANCE: filtering material is made of thermoplastic polymeric fibers. The density of material increases downstream, whereas the diameter of fibers decreases downstream. The inner layer of the material has areas the density of fibers in which is lower than the averaged density of upper layers by a factor of 2-6.

EFFECT: enhanced strength.

1 dwg, 1 tbl

FIELD: polymer materials and gas treatment.

SUBSTANCE: invention relates to polymeric fibrous filter materials designed for effective cleaning of air stream due to realization of mechanical and electrostatic filtration. Material suitable for use in respiratory masks contains (i) a layer in the form of cloth 1 mm thick made from polypropylene fibers with diameter 0.5-1.5 μm, packaging density 0.25-0.30 g/cm3, and electric charge with surface density 17-21 nCl/cm2, the layer being made by aerodynamic atomization of melt and electrization of fibers in corona discharge field during their formation, and (ii) an additional layer in the form of non-electrized cloth 1 mm thick made from polypropylene fibers with diameter 10-20 μm and packaging density 0.25-0.30 g/cm3, which is placed on the side directly facing air stream to be cleaned, the two layers being attached to each other by spot weld. Presence of two layers results in separate but complementary realization of mechanical and electrostatic filtration.

EFFECT: enhanced air cleaning efficiency and prolonged lifetime of filter material.

1 tbl

FIELD: methods and devices used for production of fibrous electret linen.

SUBSTANCE: the invention is pertaining to methods and devices used for production of fibrous electret linen. The method of giving of an electrostatic charge to the fibrous non-woven linen provides that the fibrous linen is soaked with a wetting liquid, then it is saturated with a water polar liquid and dried. The gained dry product represents an electret, which may be efficiently used in the air filters, for example, in respirators.

EFFECT: the invention ensures production of a fibrous electret linen, which may be efficiently used in the air filters, for example, in respirators.

13 cl, 3 ex, 5 tbl, 4 dwg

FIELD: chemical industry; oil refining industry and other industries.

SUBSTANCE: the invention is pertaining to production of materials for the filtering water-separating elements used in devices for purification of organic fluids, predominantly, hydrocarbon fuels, oils, oil products from the emulsified water and mechanical impurities, and may be used for purification of aircraft and car fuels in chemical industry, oil refining industry and other industries. The porous reinforced material is produced out of a permeable in all directions polymeric material with a side-porous deep structure having a total porosity of no less than 50 % with the sizes of the elementary pores, predominantly, of 10 - 200 microns. At that the porous reinforced material is formed out of a framed material having filaments or fibers with a diameter, predominantly, of 5 - 400 microns, and an arranged between the above mentioned filaments or fibers filler manufactured out of a porous polyvinyl formal produced by the method of a dew-point structurization with the thermal treatment of a homogenized in water composition containing at least polyvinyl alcohol and aldehyde. The element for the screen-water-separator contains a filtering-coagulating septum embraced by a perforated shell rings and limiting from above and from below covers. At that the septum is made multilayered out of a sheet manufactured out of the above porous reinforced material. The technical result consists in an increased effectiveness of purification of fuels (jet engine fuels and diesel fuels) and the gaseous oil products from water, and also asphalt-resinous and sulfur-containing materials, an increased service life and productivity of the filtering screens based on the indicated filtering-coagulating material.

EFFECT: the invention ensures an increased effectiveness of purification of jet engine fuels, diesel fuels, gaseous oil products from water and also asphalt-resinous and sulfur-containing materials, service life and productivity of the filtering screens based on the filtering-coagulating material.

13 cl, 3 dwg

FIELD: methods of production of filtering materials.

SUBSTANCE: the invention is pertaining to the methods of production of filtering materials, in particular, to the method of production of the filtering fibrous materials, which may be used in a means of individual protection. The filtering fibrous material is produced by an electrostatic formation of a non-woven fibrous material from a working polymeric fiber-forming solution with dynamic viscosity of 1-30P, electrical conduction of 10-4-10-7 ohm-1 cm-1 in an electrostatic field at a potential difference from 10 up to 150 kV. The solution contains in the capacity of the polymer from 8.9 up to 24.6 mass % of styrene copolymer with 5.2-30.4 mass of acrylonitrile or triple styrene copolymer with 5.2-30.4 mass of acrylonitrile and 3.7-42.1 mass % of methyl methacrylate. As a dissolvent they use ethyl acetate, or butyl acetate either their mixture. The solution in addition contains high-molecular polymethyl methacrylate, a distilled water, the lowest alcohol taken from the group ethyl alcohol, methyl alcohol or isopropyl alcohol, at the following contents of ingredients of the polymeric fiber-forming solution, in mass %: polymeric compound - 8.9-24.6; high-molecular polymethyl methacrylate - 0.011-0.02; distilled water - 0.01-0.1; the lowest alcohol - 17-28; dissolvent - the rest. The efflux of the working polymeric fiber-forming solution is exercised at the volumetric speed of 0.1 up to 6 cm3 /minute. Feeding of the working polymeric fiber-forming solution is conducted from the space interval of 12-42 cm beginning from the point of its coming out from the batching device up to the settling surface. The produced filtering fibrous material contains a technological and a working layers made out of the polymeric fibrous material produced by the above described method. The technological layer material has the surface density of 1-3 g/m2 and is made out of fibers of 3-5 microns diameter. The working layer material is made out of fibers of 1.5-3 microns diameter. The double-layer material has the surface density of 32-38 g/m2, the standard resistance of 0.8-1.2 mm of the water column and the skip coefficient of no less than 95 %. The invention ensures an improved quality of the filtering material due to an increase of efficiency of penetration of fragments with a diameter of 0.3 microns at the standard resistance of 1.0 mm of the water column.

EFFECT: the invention ensures an improved quality of the filtering material, an increased efficiency of penetration of fragments with a diameter of parts of microns at the standard resistance of 1 mm of the water column.

4 cl, 2 ex

FIELD: natural gas industry; petrochemical industry; oil-producing industry; other branches of industry; methods of production of filtering materials and the filters for purification of gases and aerosols.

SUBSTANCE: the invention offers the filtering material made out of the polysulfone fibers with different diameter of the fibers produced by electromolding from the solution in the organic solvent with addition of an electrolyte; and the frame design filter supplied with the produced material having the density of 30 - 50 g/m2. The invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.

EFFECT: the invention ensures the effective filtration of the aerosol particles at the high thermostability of the filter.

5 cl, 1 tbl, 1 dwg

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