CN111744271B - Activated carbon filter element and preparation method thereof - Google Patents
Activated carbon filter element and preparation method thereof Download PDFInfo
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- CN111744271B CN111744271B CN202010737562.XA CN202010737562A CN111744271B CN 111744271 B CN111744271 B CN 111744271B CN 202010737562 A CN202010737562 A CN 202010737562A CN 111744271 B CN111744271 B CN 111744271B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
- B01D39/2055—Carbonaceous material
- B01D39/2058—Carbonaceous material the material being particulate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/04—Additives and treatments of the filtering material
- B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/06—Filter cloth, e.g. knitted, woven non-woven; self-supported material
- B01D2239/0645—Arrangement of the particles in the filtering material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/08—Special characteristics of binders
- B01D2239/086—Binders between particles or fibres
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
- B01D2239/10—Filtering material manufacturing
Abstract
The invention relates to an activated carbon filter element, which comprises a cylindrical central rod and a filter layer arranged outside the central rod, wherein the filter layer comprises activated carbon particles and fibers coated outside the activated carbon particles, the fiber content of the innermost layer of the filter layer is set to be 30-70%, the fiber content of the outermost layer of the filter layer is set to be 20-60%, and the fiber content of the innermost layer of the filter layer is higher than that of the outermost layer of the filter layer. The invention aims to provide an activated carbon filter element which has a product structure with gradient change and has the functions of filtration effect, flow rate and strength; meanwhile, the preparation method of the filter element is simple and has little pollution.
Description
Technical Field
The invention relates to a filter element, in particular to an active carbon filter element and a preparation method thereof.
Background
The activated carbon filter element is a common filter element product, and is mainly used for removing pollutants in water, decoloring, filtering and purifying liquid and gas, and is also used for air purification treatment, waste gas recovery (such as recovery of gas benzene in the chemical industry), and recovery and refining of precious metals (such as absorption of gold).
Common active carbon filter core, its structure is comparatively simple, and the outside is the casing of cylinder tube-shape, and it has the active carbon material for filteration to fill in the inside of casing, encapsulates the filter core again. The active carbon part of the active carbon filter element with the structure is compacted, so that a three-dimensional space structure cannot be formed, the flow rate is low, the pressure loss is large, and even the situation of blockage can occur during the use and filtration; meanwhile, in the activated carbon filter element tightly compacted in the inside, the number of flow channels generated during filtering is small, so that part of activated carbon particles cannot play an effective filtering effect, if the filtering pressure is increased forcibly to increase the filtering flow rate, the possibility that the filtering part of the activated carbon particles is dispersed is generated, newly proliferated activated carbon particle impurities in the filtrate affect the filtering effect. Further, in the prior art, such a filter element is mainly prepared by a dry heating extrusion method, and in the preparation process, a large amount of dust is emitted, so that workshop pollution is serious, the environment is affected, more operators are required to operate, and the body health of the operators is greatly affected due to the existence of the dust. And the filter core prepared by the dry heating basic mode is fixed by the mould, so that the size of the produced product is matched with that of the mould, and if the active carbon filter cores with different sizes need to be made, the moulds with different sizes need to be prepared in advance.
Disclosure of Invention
The invention aims to provide an activated carbon filter element which has a product structure with gradient change and has the functions of filtration effect, flow rate and strength; meanwhile, the preparation method of the filter element is simple and has little pollution.
In order to achieve the purpose, the invention adopts the following technical scheme: an activated carbon filter element comprises a cylindrical central rod and a filter layer arranged outside the cylindrical central rod, wherein the filter layer comprises activated carbon particles and fibers coated outside the activated carbon particles, the fiber content of the innermost layer of the filter layer is set to be 30% -70%, the fiber content of the outermost layer of the filter layer is set to be 20% -60%, and the fiber content of the innermost layer of the filter layer is higher than that of the outermost layer of the filter layer.
By adopting the technical scheme, the fiber content ranges of the outer layer and the inner layer of the activated carbon filter element are limited. The outer layer is the surface (or the position close to the surface) of the activated carbon filter element; the inner layer is the surface (or the position close to the surface) of the activated carbon filter element, which is attached to the central rod. If the fiber content of the inner layer of the activated carbon filter element is less than 30 percent, the fiber content of the outer layer of the activated carbon filter element is less than 20 percent; the content of the whole active carbon particles is too high, so that the internal three-dimensional space structure is less, and the bonding among fibers is insufficient; if the fiber content of the inner layer of the activated carbon filter element is less than 30 percent, the fiber content of the outer layer of the activated carbon filter element is more than 60 percent; the content of the active carbon particles in the fiber is too much, so that the fiber content is too low, the binding force is low, and the fiber is easy to disperse; if the fiber content of the inner layer of the activated carbon filter element is more than 70 percent, the fiber content of the outer layer of the activated carbon filter element is less than 20 percent; the flow velocity is large outside and small inside, so that the inside is impacted, and the fiber is easy to disperse; if the fiber content of the inner layer of the active carbon filter element is more than 70 percent, the fiber content of the outer layer of the active carbon filter element is more than 60 percent; the content of active carbon particles is relatively low, the filtering effect of the whole filter element is reduced, and fibers are easy to strip.
Further, the fibers include fibrillated support fibers having a canadian freeness set between 100cc and 800cc.
Further, the length of the supporting fiber is set between 300 μm and 3000 μm, and the thickness of the supporting fiber is set between 10 μm and 60 μm.
Further, the mass ratio of the support fibers to the activated carbon particles in the filter layer is between 0.05 and 0.5.
Further, the fiber content in the filter layer gradually decreases from inside to outside.
Further, the fiber content in the filter layer decreases to a greater extent closer to the outer layer.
By adopting the technical scheme, the fibrillation degree, thickness and length of the supporting fibers and the content proportion and content variation trend of the fibers are limited, and the structures with different fiber contents at different positions in the filtering layer of the activated carbon filter element are easier to realize. Make the inside whole level that presents one and have the gradient of filter layer of active carbon filter core, when guaranteeing bonding strength between active carbon granule and the fibre, improved the utilization ratio of filter layer, promoted the filter effect. The decisive contribution to the mass ratio here is the content of the added components in the raw materials. If the ratio is too low, the overall structural strength of the activated carbon filter element is low, and the activated carbon filter element is easily dispersed by filtrate during filtration; if the ratio is too high, the overall supporting strength of the activated carbon filter element can be improved, but the pressure drop of the activated carbon filter element can be increased, and the flow rate of filtration is influenced.
Further, the fiber also comprises a binding fiber and an adsorbing fiber; the binder fibers include, but are not limited to, one or more of urea fibers, melamine-formaldehyde polymer fibers, glyoxalated polyacrylamide resin fibers, polyamide epichlorohydrin fibers, acrylamide resin fibers; the adsorption fiber comprises one or more of carbon fiber, chitosan fiber and alginic acid fiber.
Furthermore, in the total amount of the fibers, the content of the supporting fibers is 10-50%, the content of the bonding fibers is 10-40%, and the content of the adsorption fibers is 20-70%.
Further, the support fibers include, but are not limited to, one or more of cellulose fibers, polypropylene fibers, and polyacrylonitrile fibers.
Further, the binder fibers include, but are not limited to, one or more of urea fibers, melamine-formaldehyde polymer fibers, glyoxalated polyacrylamide resin fibers, polyamide epichlorohydrin fibers, and acrylamide resin fibers.
Further, the adsorption fiber includes but is not limited to one or more of carbon fiber, chitosan fiber and alginic acid fiber.
Through adopting above-mentioned technical scheme, further inject fibre kind, content and composition that contain in the fibre, bonding fiber can be with carrying out bonding between the fibrillated support fiber and the support fiber fixed, can also carry out bonding between active carbon granule and the support fiber fixed simultaneously, can also bond at the surface of active carbon granule, fill the gap between active carbon granule and the support fiber for the active carbon granule wraps up in the support fiber more firmly. And the setting of adsorption fiber provides a functional fiber who plays adsorption function promptly, can increase the function of high active carbon filter core, makes it not light can filter ordinary impurity in the liquid, also can be through adsorption fiber's effect, adsorbs some metal ion or other impurity of filtration.
Further, the particle size of the activated carbon particles is set between 60 meshes and 400 meshes.
Further, the content of the activated carbon particles in the filter layer is set between 30wt% and 90wt%, and the specific surface area of the activated carbon particles in the filter layer is 600m 2 /g-1200m 2 The ratio of the carbon atoms to the carbon atoms is between/g.
By adopting the technical scheme, the mesh number of the activated carbon particles indicates the particle size of the activated carbon particles, and the content and the specific surface area of the activated carbon particles are combined to ensure that the activated carbon filter element has higher adsorption effect while ensuring the bonding strength among the activated carbon particles, the supporting fibers and the bonding fibers.
Further, the surface hardness loss of the activated carbon filter element after the activated carbon filter element is fully wetted is between 40 and 70 percent.
The hardness loss shows whether the structural strength of the activated carbon filter element is firm or not, and under the same condition, the smaller the hardness loss is, the stronger the structural strength of the whole activated carbon filter element can be reflected from the side surface.
The invention also provides a preparation method of the activated carbon filter element, which comprises the following steps: s1: preparing slurry, selecting active carbon particles and fibers as raw materials, uniformly mixing and stirring the raw materials and water, wherein the content of the fibers in the raw materials is between 10 and 80 weight percent; s2: filling the slurry into a material liquid pool of a filter element forming machine, sleeving a central rod into the outer side of a negative pressure adsorption pipe of the filter element forming machine, and soaking the central rod into the material liquid pool for adsorption forming to form a primary finished filter element, wherein the external negative pressure of the negative pressure adsorption pipe is between-40 kpa and-95 kpa; s3: rolling the surface of the primary finished filter element by using a press roller; s4: and drying the primary finished filter element.
Further, during the adsorption molding in the step S2, the center rod rotates at a constant speed, and the rotating speed is set to be between 10r/min and 20 r/min.
Further, in the step S2, the thickening speed is between 0.3mm/S and 6mm/S when the filter layer is formed.
Further, in the step S2, a PP nonwoven fabric is wrapped outside the center rod, and then the center rod is sleeved outside the negative pressure adsorption tube of the filter element forming machine.
Further, the method comprises the following steps: s5: and (5) wrapping the PE and PET composite non-woven fabrics outside the filter element finished in the step (S4), and heating to enable the non-woven fabrics to be adhered to the outer surface of the filter layer.
Furthermore, the content of the activated carbon particles in the raw material is between 20 and 90 weight percent, the content of the adhesive for forming the binding fiber is between 5 and 30 weight percent, and the content of the supporting fiber is between 5 and 60 weight percent.
Further, the support fibers are fibrillated support fibers having a canadian freeness between 100cc and 800cc.
Further, the raw material also comprises adsorption fibers, and the adsorption fibers include but are not limited to one or more of carbon fibers, chitosan fibers and alginic acid fibers.
Furthermore, the content of the active carbon particles in the raw material is between 30 and 90 weight percent, the content of the adsorption fibers is between 5 and 40 weight percent, the content of the support fibers is between 1 and 30 weight percent, and the adhesive accounts for between 1 and 20 weight percent.
Further, the binder includes, but is not limited to, one or more of urea, melamine-formaldehyde polymer, glyoxalated polyacrylamide resin, polyamide epichlorohydrin, acrylamide resin.
Further, the support fiber includes, but is not limited to, one or more of cellulose fiber, polypropylene fiber, and polyacrylonitrile fiber.
Further, the content of the raw materials in the slurry is set to be between 2 and 10 weight percent.
By adopting the technical scheme, the negative pressure absorbed by the negative pressure pipe is controlled, and the content of the fibers in the raw materials is controlled, so that the content of the fibers in different areas in the filter layer of the active carbon filter element in the forming process is ensured. If the external negative pressure of the negative pressure adsorption pipe is too large in the forming process, all the activated carbon particles and fibers in the slurry are adsorbed once in the adsorption process, and the structure in the scheme cannot be formed; if the external negative pressure of negative pressure adsorption tube is too small, the conditions of too high content of inner layer fibers and too few active carbon particles are easily caused, and the forming speed of the product is also influenced. It should be noted that the binder fiber is formed by adding a binder to the raw material, dissolving the binder in the slurry, and precipitating the binder into the binder fiber in the subsequent drying step. For ease of description and characterization, in the case where a binder is added to the raw materials, the binder content may also be counted as in the fiber.
Compared with the prior art, the active carbon filter element has the advantages that: 1. the whole structural strength of active carbon filter core is big, and active carbon granule is difficult to be washed to the filtrating in prior art. 2. The inside closely knit degree of active carbon filter core is lower, has more filtration runner, can improve filtration efficiency again when guaranteeing the filter effect, and the pressure drop that the filtrating flowed through active carbon filter core when further can also reducing the filtration reduces the energy consumption. 3. The part of the active carbon filter element playing a role in filtering has a gradient structure.
Compared with the prior art, the preparation method of the active carbon filter element has the advantages that: 1. no pollution and no dust to the environment in the production process. 2. The forming process of the activated carbon filter element is more controllable, the size of the final activated carbon filter element product can be adjusted according to the time of adjusting different process steps during forming, and molds with different sizes do not need to be prepared additionally.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
FIG. 1 is a schematic view of the present invention for measuring differential pressure of an activated carbon filter element;
FIG. 2 is a schematic diagram of measuring filtration efficiency of an activated carbon filter element in accordance with the present invention;
FIG. 3 is a schematic representation of the measurement of hardness loss in use of an activated carbon filter element in accordance with the present invention;
FIG. 4 is an electron micrograph of the outer layer of the filter layer of sample 1 according to the present invention;
FIG. 5 is an electron micrograph of the inner layer of the filter layer of sample 1 in the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The first embodiment is as follows:
an activated carbon filter element comprises a central rod and a filter layer arranged outside the central rod, wherein the filter layer comprises a supporting fiber net formed by fibrillated cellulose fibers, a bonding fiber net formed by urea fibers, an adsorption fiber net formed by taking chitosan fibers as a raw material and activated carbon particles distributed in the middle of the fiber net. The outside of the center rod is wrapped with PP non-woven fabrics, and the outside of the filter layer is wrapped with PE and PET composite non-woven fabrics. In order to prevent that the filter core from coming off from the filter layer and getting into filtrating influence the filter effect under the operating mode of higher pressure and velocity of flow, the active carbon granule also can make things convenient for the filter core transportation when preserving simultaneously, and the surface is clean relatively, and the active carbon granule can not drop. For the filter layer, the interior of the filter layer has a gradient three-dimensional space structure, the fiber content is high at the position close to the inner layer, and the active carbon particle content is low; the fiber content of the position close to the outer layer is low, and the active carbon particle content is high. In this embodiment, the activated carbon filter element may be in the form of an opening at both ends to fit some filters with self-contained potting ends.
A preparation method of an activated carbon filter element comprises the following steps:
s1: and (5) preparing slurry. Selecting the particle size of 60 meshes and the specific surface area of 600m 2 The preparation method comprises the following steps of taking/g of activated carbon particles, fibrillated cellulose fibers, urea and chitosan fibers as raw materials, uniformly mixing and stirring the raw materials with water, wherein the Canadian freeness of the fibrillated cellulose fibers is 100cc. In the raw material, the content of the activated carbon particles accounts for 30wt%, the content of the cellulose fibers accounts for 30wt%, the content of the urea accounts for 20wt%, and the content of the chitosan fibers accounts for 20wt%. According to the slurry prepared in the step S1, the content of the raw materials in the slurry accounts for 2wt%, namely the concentration of the slurry is 2%.
S2: and filling the slurry into a material liquid pool of a filter element forming machine, sleeving the central rod outside the negative pressure adsorption tube of the filter element forming machine, and then soaking the central rod into the material liquid pool for adsorption forming to form a primary finished product filter element. Before the central rod is sleeved outside the negative pressure adsorption tube, a layer of PP non-woven fabric is required to wrap the outside of the central rod, so that excessive slurry is prevented from being sucked out to cause the waste of the feed liquid in the forming process. In the process of forming the filter element, the negative pressure is pumped by the negative pressure adsorption pipe at a constant pressure, the central rod is driven to rotate at a constant speed, the rotating speed of the central rod is further limited to be 20r/min, the negative pressure inside and outside the negative pressure adsorption pipe is-40 kpa, and the thickening speed of a filter layer of the negative pressure adsorption pipe is 0.6mm/s when the filter element is formed under the condition.
S3: and (3) taking the primary finished filter element formed in the step (S2) out of the feed liquid pool, and rolling the surface of the primary finished filter element by using a press roller. It should be noted that in this step, the rolling is only for the purpose of flattening the surface of the as-formed filter element by rolling, and the density of the surface is little affected.
S4: and (4) putting the surface-rolled primary finished filter element into an oven for drying.
S5: and (3) wrapping the dried filter element with PE and PET composite non-woven fabrics, and heating simultaneously. In the step, the PE material in the composite non-woven fabric is melted by heating, so that the composite non-woven fabric is attached and adhered to the outer surface of the filter layer, and finally the sample 1 is prepared, wherein the structure of the outer layer of the filter layer is shown in figure 4; the structure of the inner layers of the filter layer is shown in fig. 5.
Further, in the case of selecting the same raw materials as in example one, the content of each raw material was changed, the above steps were repeated to prepare an activated carbon filter element, and the activated carbon filter element was tested for correlation properties and recorded, as detailed in table one below. In the following table one, the content of the activated carbon particles is in units of%; the unit of the specific surface area of the activated carbon particles is m 2 (ii)/g; cellulose fiber content in%; urea content, in%; chitosan fiber content, in units; slurry concentration in%; the fiber contents of the inner layer and the outer layer are calculated in unit; the unit of the pressure difference is Mpa; filtration efficiency in%; hardness loss in%.
Table one:
here, we explain the measurement of the differential pressure in the first table, and the measuring device comprises a clean water source, a flow rate meter, a water pump, a pressure meter, a single-core filter and a pipeline connecting the clean water source, the flow rate meter, the water pump, the pressure meter and the single-core filter which are connected in sequence, as shown in fig. 1. The velocity of flow table is used for measuring the interior fluidic velocity of flow of pipeline, and the manometer is used for measuring the pressure size of single core filter water inlet department, and single core filter bottom liquid outflow is close to its pressure default with the air and is 0, therefore the pressure value that the manometer was measured is the pressure differential of liquid through the filter core promptly. Under the condition that the flow rate of liquid in the whole pipeline is the same, the higher the pressure at the position is, the higher the resistance received by the single-core filter during liquid filtration is, and the influence of the side surface on the flow rate during active carbon filter core filtration is large.
The specific measurement steps are as follows:
taking a finished product of the activated carbon filter element with the length of 245mm +/-2 mm, and packaging end covers at two ends of the finished product to form a complete filter element.
Put into single core filter with the filter core, open water pump intercommunication pipeline and carry out water exhaust to single core filter inside, after the air exhaust completion of single core filter inside, close the exhaust hole of single core filter lateral wall.
And adjusting the water pump, controlling the flow rate of liquid in the pipeline to be 10L/min, and reading and recording the reading of the pressure gauge.
In table one, the filtration efficiency measuring device comprises a residual chlorine testing device providing 2ppm ± 0.2ppm sodium hypochlorite solution, a water pump, a single core filter, a larvada, and a pipeline connecting them, as shown in fig. 2.
The specific measurement steps are as follows:
taking a finished product of the activated carbon filter element with the length of 245mm +/-2 mm, and packaging end covers at two ends of the finished product to form a complete filter element.
Put into single core filter with the filter core, open water pump intercommunication pipeline and carry out water exhaust to single core filter inside, after the air exhaust completion of single core filter inside, close the exhaust hole of single core filter lateral wall.
The sodium hypochlorite solution with the concentration of 2ppm +/-0.2 ppm is injected into the water inlet of the single-core filter, and in the testing method, the sodium hypochlorite solution is formed by mixing pure water and the sodium hypochlorite solution, and a residual chlorine measuring device is also arranged at the water inlet of the single-core filter so as to measure the residual chlorine content during water inflow.
And (4) measuring the content of the residual chlorine at the water outlet of the single-core filter by using a residual chlorine measuring device, and recording.
In table one, the hardness loss of the activated carbon filter element specifically means that after the activated carbon filter element is used, an internal filter layer of the activated carbon filter element is soaked and washed by liquid to cause loose structure of the activated carbon filter element, and even the activated carbon powder and particles fall off to influence filtration, under the condition of controlling the same filtration flow rate and filtrate amount, the smaller the hardness loss of the activated carbon filter element is, the higher the structural strength of the filter layer on the surface is, the higher the working pressure and flow rate can be applied, and meanwhile, the service life of the activated carbon filter element can be relatively longer.
For hardness loss, the specific test requires connecting a clear water source, a pump, a flow meter, an activated carbon filter element and a single-core filter in sequence by using pipelines, as shown in fig. 3. And the hardness of the activated carbon filter element needs to be measured by using a hardness meter.
The specific measurement steps are as follows:
taking a finished product of the activated carbon filter element with the length of 245mm +/-2 mm, and packaging end covers at two ends of the finished product to form a complete filter element.
The active filter element was soaked in pure water for 2 hours to remove the gas inside the active carbon filter element.
And taking the active carbon filter element out of the pure water, adsorbing excessive water on the surface of the active carbon filter element by using absorbent paper, and measuring the hardness value P1 of the active carbon filter element by using a hardness meter. The hardness value P1 is an average hardness value, namely, positions 50mm away from two ends of the activated carbon filter element and areas in the middle of the filter element are respectively selected during measurement, hardness value measurement is respectively carried out, and then averaging is carried out.
The activated carbon filter element is placed in a single-core filter, a water pump communication pipeline is opened to carry out water passing exhaust inside the single-core filter, and after the air inside the single-core filter is exhausted, the exhaust hole in the side wall of the single-core filter is closed.
And adjusting a water pump, controlling the flow rate of liquid in the pipeline to be below 5L/min, and stopping water passing when the water passing amount reaches 50 tons. And closing the pipeline, taking the activated carbon filter element out of the single-core filter, adsorbing redundant water on the surface of the activated carbon filter element by using absorbent paper, and measuring the hardness value P2 of the activated carbon filter element by using a hardness meter. The hardness value P2 is also an average hardness value, and the position of the test sample point is the same as that of the hardness value P1. Final hardness loss calculation formula: q = (P1-P2)/P1 × 100%.
In the first table, the specific measurement method for measuring the fiber content of the inner layer of the filter layer and the fiber content of the outer layer of the filter layer is as follows:
taking an activated carbon filter element which is not wrapped with a non-woven fabric layer, cutting the middle of the activated carbon filter element, respectively attaching an outer layer and an inner layer of a filter layer from a cross section, sampling, wherein the sampling size is 1cm multiplied by 1cm, placing the sample on an electronic balance for weighing, and recording the weight m1;
soaking the sampled sample in dilute sulfuric acid with the concentration of 50% for 60 minutes, and then cleaning; repeating the steps for 3 times, and drying. Placing on an electronic balance for weighing, and weighing m2; that is, the fiber portion of the sample was reacted with dilute sulfuric acid, leaving activated carbon particles.
The calculated fiber content = (m 1-m 2)/m 1 × 100%.
In the first table, samples 1 to 52 all meet the conditions defined in the present embodiment, and are product examples of different activated carbon filter elements; samples 53 to 62 are comparative examples of other different activated carbon filter cartridge products, each of which has at least one condition that is not met by the present invention, and only raw materials with different performance parameters and different contents are selected in the preparation process of these comparative examples, and the preparation process is the same as that disclosed in example one. Comparing samples 1 through 52 to the comparative examples in Table one, it is readily apparent that at least one of the differential pressure, filtration efficiency, and hardness loss is poor, thus indicating that the materials, ingredients, and properties selected in the present embodiment are the most optimal embodiment.
Example two:
an activated carbon filter element comprises a central rod and a filter layer arranged outside the central rod, wherein the filter layer comprises a supporting fiber net formed by fibrillated cellulose fibers, a bonding fiber net formed by urea fibers, an adsorption fiber net formed by taking chitosan fibers as a raw material and activated carbon particles distributed in the middle of the fiber net. The outside of the center rod is wrapped with PP non-woven fabrics, and the outside of the filter layer is wrapped with PE and PET composite non-woven fabrics. In order to prevent that the filter core from coming off from the filter layer and getting into filtrating and influence the filter effect under the operating mode of higher pressure and velocity of flow, when also can make things convenient for the filter core transportation to preserve simultaneously, the surface is clean relatively, and the active carbon granule can not drop. For the filter layer, the interior of the filter layer has a gradient three-dimensional space structure, the fiber content is high at the position close to the inner layer, and the active carbon particle content is low; the fiber content of the position close to the outer layer is low, and the active carbon particle content is high. In this embodiment, the activated carbon filter element may be open at both ends to fit some filters with self-contained ends.
A preparation method of an activated carbon filter element comprises the following steps:
s1: and (5) preparing slurry. Selecting the particle diameter of 60 meshes and the specific surface area of 600m 2 The preparation method comprises the following steps of taking/g of activated carbon particles, fibrillated cellulose fibers, urea and chitosan fibers as raw materials, uniformly mixing and stirring the raw materials with water, wherein the Canadian freeness of the fibrillated cellulose fibers is 400cc. In the raw material, the content of the activated carbon particles accounts for 30wt%, the content of the cellulose fibers accounts for 30wt%, the content of the urea accounts for 20wt%, and the content of the chitosan fibers accounts for 20wt%. According to the slurry prepared in the step S1, the content of the raw materials in the slurry accounts for 2wt%, namely the concentration of the slurry is 2%.
S2: and filling the slurry into a material liquid pool of a filter element forming machine, sleeving the central rod outside the negative pressure adsorption tube of the filter element forming machine, and then soaking the central rod into the material liquid pool for adsorption forming to form a primary finished product filter element. Before the central rod is sleeved outside the negative pressure adsorption tube, a layer of PP non-woven fabric is required to wrap the outside of the central rod, so that excessive slurry is prevented from being sucked out to cause the waste of the feed liquid in the forming process. In the process of forming the filter element, the negative pressure is pumped by the negative pressure adsorption pipe at a constant pressure, the central rod is driven to rotate at a constant speed, the rotating speed of the central rod is further limited to be 15r/min, the negative pressure inside and outside the negative pressure adsorption pipe is-70 kpa, and the thickening speed of a filter layer of the negative pressure adsorption pipe is 3mm/s when the filter element is formed under the condition.
S3: and (3) taking the primary finished filter element formed in the step (S2) out of the feed liquid pool, and rolling the surface of the primary finished filter element by using a press roller. It should be noted that in this step, the rolling is only for the purpose of flattening the surface of the as-formed filter element by rolling, and the density of the surface is little affected.
S4: and (4) putting the surface-rolled primary finished filter element into an oven for drying.
S5: and (3) wrapping the dried filter element with PE and PET composite non-woven fabrics, and heating simultaneously. In the step, the PE material in the composite non-woven fabric is melted by heating, so that the composite non-woven fabric is attached to and adhered to the outer surface of the filter layer.
Further, in the case of selecting the same raw materials as in example one, the content of each raw material was changed, the above steps were repeated to prepare an activated carbon filter element, and the activated carbon filter element was tested for correlation properties and recorded, as detailed in table two below. In the following table two, the content of the activated carbon particles is in units of%; the unit of the specific surface area of the activated carbon particles is m 2 (ii)/g; cellulose fiber content in%; urea content, in%; chitosan fiber content, in units; slurry concentration in%; the fiber content of the inner layer and the outer layer is calculated in unit; the unit of the pressure difference is Mpa; filtration efficiency in%; hardness loss in%.
Table two:
the fiber content of the inner layer, the fiber content of the outer layer, the pressure difference, the filtration efficiency and the hardness loss of the filtration layer in table two were also measured in the same manner as those in example one.
In the second table, samples 63 to 114 all meet the conditions defined in the present disclosure, and are product examples of different activated carbon filter elements; samples 115 to 124 are comparative examples of other different activated carbon filter element products, each of which has at least one condition that is not met the requirements of the present invention, and only raw materials with different performance parameters and different contents are selected in the preparation process of the comparative examples, and the preparation process is the same as that disclosed in example two. Comparing samples 63 through 114 to the comparative examples in table two, it is not difficult to find that at least one of the data for pressure differential, filtration efficiency, and hardness loss is poor, thus indicating that the materials, ingredients, and properties selected in this scheme are the best.
Example three:
an activated carbon filter element comprises a central rod and a filter layer arranged outside the central rod, wherein the filter layer comprises a supporting fiber net formed by fibrillated cellulose fibers, a bonding fiber net formed by urea fibers, an adsorption fiber net formed by taking chitosan fibers as a raw material and activated carbon particles distributed in the middle of the fiber net. The outside of the center rod is wrapped with PP non-woven fabrics, and the outside of the filter layer is wrapped with PE and PET composite non-woven fabrics. In order to prevent that the filter core from coming off from the filter layer and getting into filtrating and influence the filter effect under the operating mode of higher pressure and velocity of flow, when also can make things convenient for the filter core transportation to preserve simultaneously, the surface is clean relatively, and the active carbon granule can not drop. For the filter layer, the interior of the filter layer has a gradient three-dimensional space structure, the fiber content is high at the position close to the inner layer, and the active carbon particle content is low; the position close to the outer layer has low fiber content and high active carbon particle content. In this embodiment, the activated carbon filter element may be in the form of an opening at both ends to fit some filters with self-contained potting ends.
A preparation method of an activated carbon filter element comprises the following steps:
s1: and (5) preparing slurry. Selecting the particle diameter of 60 meshes and the specific surface area of 600m 2 The preparation method comprises the following steps of taking/g of activated carbon particles, fibrillated cellulose fibers, urea and chitosan fibers as raw materials, uniformly mixing and stirring the raw materials with water, wherein the Canadian freeness of the fibrillated cellulose fibers is 800cc. In the raw material, the content of the activated carbon particles accounts for 30wt%, the content of the cellulose fibers accounts for 30wt%, the content of the urea accounts for 20wt%, and the content of the chitosan fibers accounts for 20wt%. According to the slurry prepared in the step S1, the content of the raw materials in the slurry accounts for 2wt%, namely the concentration of the slurry is 2%.
S2: and filling the slurry into a material liquid pool of a filter element forming machine, sleeving the central rod outside the negative pressure adsorption tube of the filter element forming machine, and then soaking the central rod into the material liquid pool for adsorption forming to form a primary finished product filter element. Before the central rod is sleeved outside the negative pressure adsorption tube, a layer of PP non-woven fabric is required to wrap the outside of the central rod, so that excessive slurry is prevented from being sucked out to cause the waste of the feed liquid in the forming process. In the process of forming the filter element, the negative pressure is pumped by the negative pressure adsorption pipe at a constant pressure, the central rod is driven to rotate at a constant speed, the rotating speed of the central rod is further limited to 10r/min, the negative pressure inside and outside the negative pressure adsorption pipe is-95 kpa, and the thickening speed of a filter layer of the negative pressure adsorption pipe is 6mm/s when the filter element is formed under the condition.
S3: and (3) taking the primary finished filter element formed in the step (S2) out of the feed liquid pool, and rolling the surface of the primary finished filter element by using a press roller. It should be noted that in this step, the purpose of rolling is only to roll the surface of the primary filter element flat, and the density of the surface is little affected.
S4: and (4) putting the surface-rolled primary finished filter element into an oven for drying.
S5: and (3) wrapping the dried filter element with PE and PET composite non-woven fabrics, and heating simultaneously. In the step, the PE material in the composite non-woven fabric is melted by heating, so that the composite non-woven fabric is attached and adhered to the outer surface of the filter layer.
Further, under the condition that the same raw materials as those in example one are selected, the content of each raw material is changed, the above steps are repeated to prepare the activated carbon filter element, and the activated carbon filter element is subjected to a correlation performance test and recorded, which is detailed in the following table three. In the third table, the content of the activated carbon particles is expressed in units; the unit of the specific surface area of the activated carbon particles is m 2 (ii)/g; cellulose fiber content in%; urea content, in%; chitosan fiber content, in units; slurry concentration in%; the fiber content of the inner layer and the fiber content of the outer layer are calculated according to the unit; the unit of the pressure difference is Mpa; filtration efficiency in%; hardness loss in%.
Table three:
the fiber content of the inner layer, the fiber content of the outer layer, the pressure difference, the filtration efficiency and the hardness loss of the filter layer in table three were also measured in the same manner as in example one.
In table three, samples 125 to 176 all meet the conditions defined in the present embodiment, and are product examples of different activated carbon filter elements; samples 177 to 186 are comparative examples of other different activated carbon filter element products, each of which has at least one condition that is not in accordance with the present invention, and only raw materials with different performance parameters and different contents are selected in the preparation process of the comparative examples, and the preparation process is the same as that disclosed in example three. Comparing samples 125 through 176 to the comparative example in table three, it is readily apparent that at least one of the data for pressure differential, filtration efficiency, and hardness loss is poor, thus indicating that the materials, ingredients, and properties selected in this scheme are the best scheme.
While the preferred embodiments of the present invention have been illustrated and described in detail, it should be understood that various changes and modifications of the invention can be effected therein by those skilled in the art after reading the above teachings of the invention. Such equivalents are intended to fall within the scope of the claims appended hereto.
Claims (16)
1. The utility model provides an active carbon filter core, is including being the well core rod of cylinder form and setting up in its outside filter layer, its characterized in that: the filter layer comprises activated carbon particles and fibers coated outside the activated carbon particles, the fiber content of the innermost layer of the filter layer is set to be 30-70%, the fiber content of the outermost layer of the filter layer is set to be 20-60%, the fiber content in the filter layer is gradually reduced from inside to outside, and the fiber content of the innermost layer of the filter layer is higher than the fiber content of the outermost layer of the filter layer; the fibers comprise fibrillated support fibers having a canadian freeness set between 100cc and 800 cc; the length of the supporting fiber is set between 300 and 3000 mu m, and the thickness of the supporting fiber is set between 10 and 60 mu m; the mass ratio of the support fibers to the activated carbon particles in the filter layer is 0.05-0.5; the particle size of the activated carbon particles is set between 60 meshes and 400 meshes.
2. The activated carbon filter element of claim 1, wherein the fiber content decreases by a greater amount closer to the outer layer in the filtration layer.
3. The activated carbon filter element of claim 1, wherein the fibers further comprise binder fibers and adsorbent fibers; the bonding fiber comprises one or more of urea fiber, melamine-formaldehyde polymer fiber, glyoxalated polyacrylamide resin fiber, polyamide epichlorohydrin fiber and acrylamide resin fiber; the adsorption fiber comprises one or more of carbon fiber, chitosan fiber and alginic acid fiber.
4. The activated carbon filter element of claim 3, wherein the total amount of fibers comprises between 10% and 50% support fibers, between 10% and 40% binder fibers, and between 20% and 70% adsorbent fibers.
5. The activated carbon filter cartridge of claim 1, wherein the support fibers comprise one or more of cellulose fibers, polypropylene fibers, and polyacrylonitrile fibers.
6. The activated carbon filter element of claim 1, wherein the activated carbon particle content of the filtration layer is between 30wt% and 90wt%, and the specific surface area of the activated carbon particles in the filtration layer is between 600 square meters per gram and 1200 square meters per gram.
7. The activated carbon filter element of claim 1, wherein the activated carbon filter element has a surface hardness loss between 40% and 70% after sufficient wetting.
8. The method for preparing an activated carbon filter element according to claims 1 to 7, comprising the steps of:
s1: preparing slurry, selecting active carbon particles and fibers as raw materials, uniformly mixing and stirring the raw materials and water, wherein the content of the fibers in the raw materials is between 10 and 80 weight percent;
s2: filling the slurry into a material liquid pool of a filter element forming machine, sleeving a central rod into the outer side of a negative pressure adsorption pipe of the filter element forming machine, and soaking the central rod into the material liquid pool for adsorption forming to form a primary finished filter element, wherein the external negative pressure of the negative pressure adsorption pipe is between-40 kpa and-95 kpa;
s3: rolling the surface of the primary finished filter element by using a press roller;
s4: drying the primary finished filter element;
when the adsorption molding is carried out in the step S2, the central rod rotates at a constant speed, and the rotating speed is set to be between 10r/min and 20 r/min;
in the step S2, when the filter layer is formed, the thickening speed is between 0.3mm/S and 6 mm/S;
the content of raw materials in the slurry is set between 2wt% and 10 wt%.
9. The preparation method of the activated carbon filter element according to claim 8, wherein in the step S2, a PP non-woven fabric is wrapped outside the center rod, and then the center rod is sleeved outside a negative pressure adsorption pipe of the filter element forming machine.
10. The method of making an activated carbon filter element of claim 8, further comprising the steps of:
s5: and (5) wrapping the PE and PET composite non-woven fabrics outside the filter element finished in the step (S4), and heating to enable the non-woven fabrics to be adhered to the outer surface of the filter layer.
11. The method of claim 8, wherein the raw material comprises 20wt% to 90wt% of the activated carbon particles, 5wt% to 30wt% of the binder for forming the binder fibers, and 5wt% to 60wt% of the support fibers.
12. The method of making an activated carbon filter element of claim 11, wherein the support fiber is a fibrillated support fiber having a canadian freeness between 100cc and 800cc.
13. The method for preparing the activated carbon filter element according to claim 8, wherein the raw material further comprises adsorption fibers, and the adsorption fibers comprise one or more of carbon fibers, chitosan fibers and alginic acid fibers.
14. The method for preparing an activated carbon filter element according to claim 13, wherein the raw material contains activated carbon particles between 30wt% and 90wt%, adsorbent fibers between 5wt% and 40wt%, support fibers between 1wt% and 30wt%, and a binder between 1wt% and 20wt%.
15. The method of making an activated carbon filter element of claim 11, wherein the binder comprises one or more of urea, melamine-formaldehyde polymers, glyoxalated polyacrylamide resins, polyamide epichlorohydrin, acrylamide resins.
16. The method of making an activated carbon filter element of claim 11, wherein the support fiber comprises one or more of cellulose fiber, polypropylene fiber, and polyacrylonitrile fiber.
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| US5911883A (en) * | 1996-10-04 | 1999-06-15 | Minnesota Mining And Manufacturing Company | Flow-by solid phase extraction method |
| JPH11226337A (en) * | 1998-02-13 | 1999-08-24 | Unitika Ltd | Activated carbon fiber sheet for filter |
| EP0955087B1 (en) * | 1998-05-08 | 2008-12-24 | Toyobo Co., Ltd. | Gas adsorption sheet and air-purifying filter |
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