Method and apparatus for producing chemical adsorbent for removing harmful gases

Abstract

To provide a method for manufacturing a chemical adsorbent for removing harmful gases and an apparatus thereof.SOLUTION: According to the present invention, the impregnation step and the drying step are performed as the batch system in the same reaction tank, and the temperature control of the reaction tank is made by an oil jacket for heating surrounding the reaction tank, ensuring uniform agitation; the chemical adsorbent applied to various types of cartridge filters can be manufactured in an environmentally friendly manner without generating chemical wastewater; in impregnating chemicals to the adsorbent, the impregnation and drying steps can be efficiently and effectively performed in one device without transfer between processes and with high space availability; and the impregnation control is easy and simple by completely immersing the adsorbent in a chemical aqueous solution and then drying it, and the exposure of harmful factors to workers is reduced by minimizing the surplus usage of chemicals, whereby it is possible to contribute to the creation of a safety and health environment.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a method and apparatus for manufacturing a chemical adsorbent for removing harmful gases, and more particularly to an effective, efficient, and environmentally friendly method for manufacturing a chemical adsorbent that is applied to various types of cartridge filters for safely and effectively treating harmful chemical gases generated in laboratories, research facilities, or industrial sites, and in particular, to a manufacturing apparatus that can effectively apply the same, which does not generate chemical wastewater. [Background technology]

[0002] Conventionally, a technique for producing a chemical adsorbent by impregnating a carrier such as activated carbon, alumina, or zeolite with a chemical agent has been widely known. However, most commonly used techniques for producing chemical adsorbents using the impregnation method have a problem in that they generate chemical wastewater, which creates a secondary source of environmental pollution.

[0003] The generated chemical wastewater must be treated according to the treatment methods specified by relevant laws and regulations, which will result in the use of additional chemicals and associated costs.In addition, there is a risk of secondary accidents due to leakage during the collection, storage, movement and transportation of chemical wastewater.

[0004] When such a chemical leakage accident occurs, it not only pollutes the environment but also causes damage to national property and human lives. Therefore, there has been a demand in this industry for the development of a method and apparatus that can minimize the source of environmental pollution in the series of production of chemical adsorbents.

[0005] In recent years, environmental laws such as the Industrial Safety and Health Act, the Air Environment Conservation Act, and the Water Environment Conservation Act have been strengthened, and the demand for harmful gas purification in laboratories as well as general industrial sites has increased due to the establishment of a law on the creation of a safe laboratory environment and the enforcement of the Serious Accident Punishment Act. With this increase in demand for harmful gas purification, there is an increasing demand not only for the use of conventional adsorbents, but also for high-performance and economical chemical adsorbents for removing harmful gases.

[0006] In general, methods for producing impregnated activated carbon can be classified into a spray method in which an aqueous solution of a specific chemical is dissolved in water and then sprayed onto activated carbon to impregnate the chemical, followed by drying while flowing, an impregnation method in which activated carbon is completely immersed in an aqueous solution of the chemical, impregnated, and then dried, and a steam method in which the chemical is vaporized with heated air, impregnated with the activated carbon, and then dried, according to a method in which the spray method and the impregnation method are most widely used.

[0007] The injection method mainly uses a fluidized bed dryer, which injects activated carbon stored in an activated carbon storage tube through an activated carbon inlet, fills a certain amount of activated carbon on the top of a dispersion plate inside the fluidized bed dryer, and then injects the aqueous solution stored in the aqueous chemical solution storage tube through an aqueous chemical solution injection port at the top of the fluidized bed dryer onto the activated carbon for a certain period of time to perform an impregnation process. After a certain impregnation time has elapsed, hot air heated by a hot air blower is supplied from the bottom of the fluidized bed dryer to dry the wet activated carbon impregnated on the top of the injection plate, and compressed air is blown in during the drying process to prevent drift.

[0008] However, in this method, an aqueous solution is sprayed from the top of the fluidized bed dryer onto activated carbon piled at a certain height on top of a dispersion plate inside the fluidized bed dryer. Therefore, while the activated carbon at the top contains a sufficient amount of aqueous chemical solution, the activated carbon at the bottom may not. Therefore, in order to uniformly impregnate the packed activated carbon with the aqueous chemical solution, an appropriate amount of aqueous solution must be sprayed. However, since the amount of aqueous chemical solution to be used varies depending on the density of the activated carbon, the moisture content, the temperature, the humidity, etc., it is quite difficult to control the amount of aqueous chemical solution.

[0009] That is, if the amount of the aqueous chemical solution used is small, it may not be uniformly impregnated onto the activated carbon. Conversely, if the amount used is large, the aqueous chemical solution may flow through the numerous holes formed in the dispersion plate, causing problems in the treatment of chemical wastewater.

[0010] In the impregnation method, activated carbon is immersed in an aqueous solution of chemicals, and then left for a certain period of time to allow the chemicals to adhere to the activated carbon. This method has the disadvantage of low process efficiency because the impregnation and drying processes are separate, and there is a serious problem in that a large amount of chemical wastewater is generated during the drainage and dehydration process after the impregnation process. In addition, after the impregnation process, a separate drying process must be performed in which hot air is supplied or transported from the bottom of the reaction tank and oven drying or fluidized bed drying is performed.

[0011] As a result, both the injection method and the impregnation method have the common problem that they generate chemical wastewater, are not fully satisfactory in terms of environmental friendliness and worker safety, and require a lot of work to treat the chemical wastewater.

[0012] In particular, when chemical adsorbents for removing harmful gases are produced industrially in large quantities, an impregnation method is generally used. However, the impregnation method inevitably generates a large amount of chemical wastewater containing excessive amounts of chemicals, and therefore requires a process of transporting and treating the chemical wastewater, which not only poses the risk of environmental safety accidents in the process, but also requires a lot of time and effort.

[0013] In addition, the steam method, in which heated air is used to vaporize chemicals and the chemicals are impregnated into activated carbon, requires a supersaturated steam generator, and since it is not easy to control the amount of chemicals to be vaporized, the device configuration becomes very complicated, and there is a risk of the chemicals leaking into the atmosphere due to the generation of a large amount of steam in a short period of time.

[0014] Typical conventional techniques for producing chemical adsorbents include the following:

[0015] Korean Patent No. 10-0993807 (registered on November 5, 2010) discloses a simple impregnated activated carbon manufacturing apparatus that can simultaneously perform impregnation and drying in a cylindrical rotor reactor in order to solve the problems of both the conventional injection method and the impregnation method. The impregnation liquid is supplied using a single injection pipe arranged in the direction of the rotation axis, and an inlet pipe for drawing hot air heated by a heating device into the body and an outlet pipe for discharging the hot air are provided, preventing overheating during drying.

[0016] However, the conventional techniques essentially rely on hot air drying, and therefore have problems in that it requires a lot of energy to generate hot air, it is difficult to control the amount of impregnation of the impregnation solution through the spray pipe, and it is not easy to scale up to an industrial scale.

[0017] In addition, Korean Patent No. 10-2413214 (registered on June 21, 2022) discloses a chemical adsorbent for removing harmful gases, which uses activated carbon as a carrier and impregnates a phosphoric acid-derived compound, a manufacturing method, and a filter including the same. However, this method is essentially the same as the conventional impregnation method, except that the type of impregnation is specified, so there is a problem in that the generation of chemical wastewater is unavoidable.

[0018] In addition, Korean Patent No. 10-0374691 (registered on February 20, 2003) relates to a method for manufacturing a chemical adsorbent for removing hydrogen sulfide gas, in which activated carbon is simultaneously impregnated into a solution in which sodium hydroxide and diethanolamine are mixed in a certain ratio. However, since this method is essentially the same as the conventional impregnation method, except that two substances are simultaneously impregnated during the impregnation process, there is still the problem of generating chemical wastewater.

[0019] In addition, Korean Patent Publication No. 10-2022-0146938 (published on November 2, 2022) proposes a manufacturing method in which a metal precursor solution is mixed with activated carbon, the solution is impregnated, and the drying process includes a vacuum treatment and a calcination step after drying. However, since the calcination step is included, the manufacturing method is not related to the present invention.

[0020] In addition, Korean Patent No. 10-2472749 (registered on November 28, 2022) discloses a method for manufacturing an adsorbent material that has harmful gas removal and antibacterial and deodorizing functions. The technology involves mixing liquid and powdered raw materials and then formulating a chemical adsorbent using an extrusion molding machine, and is completely unrelated to the chemical adsorbent proposed in this invention. [Prior art documents] [Patent documents]

[0021] [Patent Document 1] Korean Patent No. 10-0993807 (registered on November 5, 2010) [Patent Document 2] Korean Patent No. 10-2413214 (registered June 21, 2022) [Patent Document 3] Korean Patent No. 10-0374691 (registered on February 20, 2003) [Patent Document 4] Korean Patent Publication No. 10-2022-0146938 (Published on November 2, 2022) Summary of the Invention [Problem to be solved by the invention]

[0022] Therefore, a first object of the present invention is to provide a method for producing a chemical adsorbent for removing harmful gases, which can be applied to various types of cartridge filters for safely and effectively treating harmful chemical gases generated in laboratories, research facilities, or industrial sites in an environmentally friendly manner without generating chemical wastewater.

[0023] A second object of the present invention is to provide a method for producing a chemical adsorbent for removing harmful gases, which can efficiently and effectively carry out the impregnation and drying steps in one apparatus using a batch system that does not require transportation when the adsorbent is impregnated with an aqueous chemical solution.

[0024] A third object of the present invention is to provide a method for producing a chemical adsorbent for removing harmful gases, which allows easy and simple control of impregnation by completely immersing the adsorbent in an aqueous chemical solution and then drying it, minimizes the amount of excess chemical used, reduces exposure of workers to harmful factors, and contributes to establishing a safe and healthy environment.

[0025] A fourth object of the present invention is to provide an apparatus which can smoothly and efficiently carry out the manufacturing method according to the above general objects. [Means for solving the problem]

[0026] The first to third objects of the present invention can be smoothly achieved by a method for producing a chemical adsorbent for removing harmful gases, the method including the steps of: preparing an aqueous solution of a chemical agent, which is a mixture of 5-20 parts by weight of a chemical agent for neutralizing or oxidizing / reducing harmful gases and 120-150 parts by weight of purified water, relative to 100 parts by weight of a carrier as an adsorbent; immersing the carrier in the aqueous solution of a chemical agent in a reaction vessel, stirring the resulting mixture at 50-100 rpm for 1-5 hours while maintaining the temperature of the reaction vessel at 60-95°C, and obtaining the resulting mixture by immersing the carrier in the aqueous solution of a chemical agent; and drying the chemical adsorbent by stirring the chemical adsorbent at 100-300 rpm for 4-10 hours while maintaining the temperature of the reaction vessel at 105-130°C until the water content of the chemical adsorbent is 5-25%, and obtaining the chemical adsorbent after completing the stirring of the resulting mixture at 50-100 rpm for 1-5 hours.

[0027] The fourth object of the present invention can be smoothly achieved by an apparatus for manufacturing a chemical adsorbent for removing harmful gases, which includes a reaction vessel having an external heating oil jacket, an impeller located in the reaction vessel and installed at the lower end of an agitation shaft having a number of air nozzles formed at predetermined intervals, and a motor and an air compressor connected to the agitation shaft. Effect of the Invention

[0028] According to the method and apparatus for producing a chemical adsorbent for removing harmful gases according to the present invention, a chemical adsorbent applicable to various types of cartridge filters can be produced in an environmentally friendly manner without generating chemical wastewater, impregnation and drying steps can be efficiently and effectively performed in one apparatus with high space utilization without transportation between processes when impregnating a chemical agent into the adsorbent, impregnation can be easily and simply controlled by completely immersing the adsorbent in an aqueous chemical solution and then drying it, and excess use of chemicals can be minimized, thereby reducing exposure of workers to harmful factors and contributing to the creation of a safe and healthy environment. [Brief description of the drawings]

[0029] [Figure 1] FIG. 1 is a diagram showing a manufacturing process according to the present invention. [Diagram 2] FIG. 2 is a schematic cross-sectional view of an apparatus according to the invention. [Diagram 3] FIG. 3 is a schematic diagram showing a reaction vessel portion of the apparatus of FIG. [Figure 4] FIG. 4 is an exemplary diagram of a chemical adsorbent produced by the production method of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0030] The present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the following description is given by way of specific examples of the present invention, and the technical idea of ​​the present invention is not limited to the following description. Note that the attached drawings are provided to aid in understanding the present invention, and the technical idea of ​​the present invention is not limited to the attached drawings.

[0031] The chemical adsorbent for removing harmful gases produced by the manufacturing method of the present invention is a general-purpose chemical adsorbent that can remove harmful gases that may be generated from acidic or basic organic / inorganic chemical substances, or any mixture of these chemical substances, by physical adsorption and chemical reactions such as neutralization reactions and oxidation-reduction reactions.

[0032] The carrier for the chemical adsorbent according to the present invention may be an organic carrier obtained by carbonizing and activating a coal-based, palm-based, wood-based (pitch-based) or polymeric resin substance, or an inorganic carrier such as alumina or zeolite, or a mixture thereof.

[0033] The selection of chemicals in the manufacture of the impregnating aqueous solution of the chemical adsorbent is to produce harmless substances through neutralization reactions or oxidation-reduction reactions. For example, in the case of the manufacture of a chemical adsorbent for removing hydrochloric acid (HCl) fumes, a basic chemical is selected that reacts with hydrochloric acid to produce a harmless salt, typically sodium hydroxide (NaOH) or calcium hydroxide (KOH). The reaction during chemical adsorption is as follows:

[0034] HCl+KOH→KCl+H2O

[0035] In addition, in the case of manufacturing a chemical adsorbent for removing fumes of ammonia (NH4), which is a representative basic gas, phosphoric acid (H3PO4) is typically and most widely used, and the reaction during chemical adsorption is as follows:

[0036] 3NH4OH+H3PO4→(NH4)33PO4+3H2O

[0037] The impregnation aqueous solution is a mixture of 120 to 150 parts by weight of purified water and 5 to 20 parts by weight of chemicals (reagents) with respect to 100 parts by weight of the adsorption carrier.

[0038] The aqueous chemical solution used in the conventional wet impregnation method is a mixture of 150 to 200 parts by weight of purified water and 10 to 50 parts by weight of chemicals (reagents) per 100 parts by weight of the adsorption carrier.

[0039] The manufacturing method of the present invention uses less chemicals than the conventional method because the conventional wet impregnation method generates chemical wastewater, which contains excessive amounts of the chemicals used, whereas the present invention does not dispose of chemicals in the chemical wastewater, and therefore the amount of chemicals used is significantly reduced.

[0040] More specifically, when a chemical adsorbent is produced by a conventional wet impregnation method, 40 to 60% by weight of the impregnation aqueous solution is discharged into the chemical wastewater, and only 60 to 40% by weight is contained in the adsorption carrier. The water contained in the carrier evaporates through a drying process.

[0041] The method for preparing a chemical adsorbent for removing harmful gases according to the present invention includes the following steps as shown in FIG. (A) Preparation stage: An aqueous chemical solution is prepared, which is a mixture of 5 to 20 parts by weight of a chemical for neutralizing harmful gases or for oxidation-reduction reaction and 120 to 150 parts by weight of purified water, per 100 parts by weight of the carrier as an adsorbent. (B) Impregnation stage: The carrier is immersed in the aqueous chemical solution in a reactor, and the resulting mixture is stirred at 50-100 rpm for 1-5 hr while maintaining the temperature of the reactor at 60-95° C. The resulting mixture is obtained by immersing the carrier in the aqueous chemical solution. (C) Drying stage: The chemical adsorbent is stirred at 100-300 rpm for 4-10 hrs while maintaining the temperature of the reaction vessel at 105-130° C. until the moisture content of the chemical adsorbent is 5-25%. The chemical adsorbent is obtained after stirring the resulting mixture at 50-100 rpm for 1-5 hrs.

[0042] The carrier used as the adsorbent may be in the form of pellets, flakes, granules, or spheres having a diameter of 1 to 7 mm and a length of up to 7 mm, as shown in FIG. 4, and the carrier may be an organic, inorganic, or organic-inorganic mixed carrier.

[0043] Specifically, in FIG. 4, d is a pellet-shaped chemical adsorbent (impregnated activated carbon) for removing ammonia having a diameter of 2 mm, e is a pellet-shaped chemical adsorbent (impregnated activated carbon) for removing sulfur dioxide having a diameter of 3 mm, and f is a spherical chemical adsorbent (impregnated alumina) for removing hydrogen sulfide having a diameter of 4 to 6 mm.

[0044] In addition, at the start of the drying step, or at an intermediate stage where the drying step is halfway through, compressed dry air from an air compressor is injected at 6 to 9 kgf / cm through an agitator shaft having a number of air nozzles. 2 The pressure can be supplied at 1000 psi.

[0045] In the production method according to the present invention, the temperature of the reaction vessel is controlled by a heating oil jacket, and the drying step is carried out by injecting compressed dry air while heating the reaction vessel.

[0046] The injected compressed air is brought into sufficient contact with the adsorption carrier impregnated with an aqueous chemical solution by the rotation of the impeller, and then discharged upward. The discharged air, which contains some of the chemicals and a large amount of moisture, is purified by an appropriate known filter means and then finally released into the atmosphere.

[0047] The method of the present invention has high space utilization since the impregnation and drying steps are carried out in a batch system in the same reaction vessel.

[0048] As shown in Figures 2 and 3, the apparatus 1 according to the present invention for smoothly carrying out the above-mentioned manufacturing method of the present invention includes a reaction vessel 100 having a heating oil jacket 105 formed on the outside, an impeller 103 installed at the lower end of a stirring shaft 101 located in the reaction vessel 100 and having a number of air nozzles 108 formed at predetermined intervals, and a motor 102 and an air compressor 200 connected to the stirring shaft 101.

[0049] The apparatus 1 according to the present invention is provided with a rotating means 106 having a rotation axis that allows the reaction vessel 100 to rotate and tilt 90 degrees in the normal direction in order to discharge the chemical adsorbent upon completion of its production.

[0050] The vertical spacing between the numerous air nozzles 108 formed on the stirring shaft 101 is 50 to 150 mm (a in Figure 3), the distance from the center of the stirring shaft 101 to the inner surface of the reaction tank 100 is 450 to 650 mm (b in Figure 3), and the distance from the lowest nozzle 108 to the bottom surface of the reaction tank 100 is a maximum of 300 mm (c in Figure 3).

[0051] Furthermore, a plurality of the air nozzles 108 may be formed at the same height of the stirring shaft 101 in a cross shape, a radial shape, a triangular branch shape, or the like.

[0052] In the drawings, unexplained reference numeral 104 denotes a control panel, and 107 denotes movable casters.

[0053] Example 1: Preparation of a chemical adsorbent for removing ammonia gas Activated carbon pellets with a diameter of 3 mm were used as a carrier for the chemical adsorbent, and an aqueous chemical solution was prepared consisting of a mixture of 100 parts by weight of activated carbon, 150 parts by weight of purified water, and 10 parts by weight of phosphoric acid (85% purity, food additive grade) as a chemical (reagent). After impregnation for 4 hours at a reaction temperature of 60°C and a stirring speed of 50 rpm, the mixture was dried for 8 hours at a drying temperature of 105°C and a stirring speed of 300 rpm. After 4 hours of drying, 7 kgf / cm was blown through an air nozzle-integrated stirring shaft. 2 Dry air was supplied at a pressure of The chemical adsorbent for removing ammonia gas produced as described above was dried to a moisture content of 15%.

[0054] Example 2: Preparation of a chemical adsorbent for removing ammonia gas Activated carbon pellets with a diameter of 3 mm were used as a carrier for the chemical adsorbent, and an aqueous chemical solution was prepared consisting of a mixture of 150 parts by weight of purified water and 20 parts by weight of phosphoric acid (85% purity, food additive grade) as a chemical (reagent) per 100 parts by weight of activated carbon. After impregnation for 4 hours at a reaction temperature of 60°C and a stirring speed of 50 rpm, the mixture was dried for 8 hours at a drying temperature of 105°C and a stirring speed of 300 rpm. After 4 hours of drying, 7 kgf / cm was blown through an air nozzle-integrated stirring shaft. 2 Dry air was supplied at a pressure of The chemical adsorbent for removing ammonia gas produced as described above was dried to a moisture content of 15%.

[0055] Example 3: Preparation of a chemical adsorbent for removing sulfur dioxide gas Activated carbon pellets with a diameter of 3 mm were used as a carrier for the chemical adsorbent, and an aqueous chemical solution was prepared consisting of a mixture of 100 parts by weight of activated carbon, 150 parts by weight of purified water, and 10 parts by weight of potassium hydroxide (95% purity) as a chemical (reagent). After impregnation for 4 hours at a reaction temperature of 90°C and a stirring speed of 50 rpm, the mixture was dried for 8 hours at a drying temperature of 105°C and a stirring speed of 300 rpm. After 4 hours of drying, 7 kgf / cm was blown through an air nozzle-integrated stirring shaft. 2 Dry air was supplied at a pressure of The chemical adsorbent for removing sulfur dioxide gas produced as described above was dried to a moisture content of 15%.

[0056] Example 4: Preparation of a chemical adsorbent for removing hydrogen sulfide gas Spherical activated alumina with a particle size of 4 to 6 mm was used as a carrier for the chemical adsorbent, and an aqueous chemical solution was prepared consisting of a mixture of 120 parts by weight of purified water and 10 parts by weight of potassium permanganate (purity 99 w / w%) as a chemical agent (reagent) for 100 parts by weight of activated carbon. After impregnation for 2 hours at a reaction temperature of 65°C and a stirring speed of 50 rpm, the mixture was dried for 6 hours at a drying temperature of 120°C and a stirring speed of 300 rpm. After 2 hours of drying, 7 kgf / cm was blown through an air nozzle-integrated stirring shaft. 2 Dry air was supplied at a pressure of 1000 psi for 4 hours. The chemical adsorbent for removing hydrogen sulfide gas produced as described above was dried to a moisture content of 5%.

[0057] Comparative Example 1: Production of chemical adsorbent for removing ammonia gas by conventional impregnation method Activated carbon pellets with a diameter of 3 mm were used as a carrier for the chemical adsorbent, and an aqueous chemical solution was prepared consisting of 100 parts by weight of activated carbon, 200 parts by weight of purified water, and 40 parts by weight of phosphoric acid (85% purity, food additive grade) as a chemical (reagent).

[0058] After impregnation at a reaction temperature of 25°C for 4 hours, the mixture was dehydrated and dried for 12 hours using hot air at a temperature of 105°C until the moisture content reached 15 w / w%.

[0059] Comparative Example 2: Production of chemical adsorbent for removing sulfur dioxide gas by conventional impregnation method Activated carbon pellets with a diameter of 3 mm were used as a carrier for the chemical adsorbent, and an aqueous chemical solution was prepared consisting of a mixture of 150 parts by weight of purified water and 20 parts by weight of potassium hydroxide (95% purity) as a chemical (reagent) per 100 parts by weight of activated carbon. After impregnation at a reaction temperature of 25°C for 4 hours, the mixture was dehydrated and dried for 12 hours using hot air at a temperature of 105°C until the moisture content reached 15 w / w%.

[0060] Comparative Example 3: Production of chemical adsorbent for removing hydrogen sulfide gas by conventional impregnation method Activated alumina with a particle size of 4 to 6 mm was used as a carrier for the chemical adsorbent, and an aqueous chemical solution was prepared consisting of a mixture of 100 parts by weight of activated carbon, 150 parts by weight of purified water, and 10 parts by weight of potassium permanganate (purity 99 w / w%) as a chemical (reagent). After impregnation at a reaction temperature of 25°C for 2 hours, the mixture was dehydrated and dried for 8 hours using hot air at a temperature of 120°C until the moisture content reached 5%.

[0061] As described above, Examples 1 to 4 according to the present invention were produced without generating chemical wastewater or performing a separate transportation process, while the conventional impregnation methods of Comparative Examples 1 to 3 were based on commonly used chemical adsorbent impregnation methods that generate chemical wastewater through a separate dehydration process.

[0062] Test Example 1: Harmful gas removal rate per gram of chemical adsorbent The harmful gas removal rates per gram of the chemical adsorbents produced in Examples 1 to 4 and Comparative Examples 1 to 3 were measured, and the results are shown in Table 1 below.

[0063] [Table 1]

[0064] Referring to Table 1, Example 1 of the chemical adsorbent for removing ammonia gas according to the present invention and Comparative Example 1 of the chemical adsorbent for removing ammonia gas using a conventional impregnation method did not show a large difference in ammonia gas removal performance under the same test conditions within the range of experimental error. It can be seen from Example 1 and Comparative Example 1 that, when a chemical adsorbent is produced using the production method and production apparatus according to the present invention, the amount of chemicals input when producing an impregnation aqueous solution can be reduced, there is no process transfer, and no wastewater is generated, so that the process can be simplified and the environmental impact can be reduced.

[0065] From Table 1, it was found that the higher the concentration of the impregnation aqueous solution (the more the amount of chemical used) in Examples 1 and 2, the higher the ammonia harmful gas removal performance. Also, from Example 2 and Comparative Example 1, it was confirmed that even if the same amount of chemical used is used, in the conventional impregnation method, the chemicals contained in the wastewater are discarded due to the generation of wastewater, and are actually discarded without being used in the chemical adsorbent carrier.

[0066] From Table 1, Example 3, Comparative Example 2, and Example 4, Comparative Example 3, it can be seen that the present invention provides a manufacturing method and apparatus that can maintain the same chemical adsorption power even with a reduced amount of chemicals used compared to the conventional impregnation method.

[0067] In addition, it was found that the commonly used chemical adsorbents for removing ammonia have a maximum phosphoric acid chemical usage of up to 70% by weight based on the impregnation amount of the conventional patent technology and the commercially available adsorbents used, and the main products use an average of 40% by weight.

[0068] Various other chemical adsorbents, which use an impregnation method in the manufacturing process of the chemical adsorbent, have a high environmental impact due to the use of excessive amounts of chemicals and the generation of chemical wastewater, but the manufacturing method and manufacturing apparatus according to the present invention can minimize the environmental impact.

[0069] Therefore, it was confirmed that excessive use of chemicals in the production of chemical adsorbents is due to the chemicals being discarded in wastewater, which is the limit of conventional impregnation technology, and that when the production method and production apparatus according to the present invention are used, the required performance of currently commonly used chemical adsorbents can be achieved even with a smaller amount of chemicals than before.

[0070] Although the present invention has been described above based on examples, comparative examples, and test examples, those skilled in the art can easily make various changes and modifications within the scope of the essential characteristics of the present invention. Therefore, the disclosed examples should be considered from an explanatory perspective, not a limiting one, and the true scope of the present invention is shown in the claims, not the above description, and all differences within the scope equivalent thereto should be understood to be included in the present invention. [Explanation of symbols]

[0071] 1. Apparatus for producing a chemical adsorbent according to the present invention 100 Reactors 101 Agitator shaft (with integrated air injection) 102 Motor 103 Impeller 104 Control Panel 105 Oil Jacket 106 Rotation means 107 Caster 108 Air nozzle 200 Air Compressor

Claims

1. A method for producing a chemical adsorbent for removing harmful gases, comprising: (A) preparing an aqueous solution of chemicals, which is a mixture of 5 to 20 parts by weight of a chemical for neutralizing or oxidizing / reducing harmful gases and 120 to 150 parts by weight of purified water, relative to 100 parts by weight of a carrier as an adsorbent; (B) an impregnation step, in which the carrier is immersed in the aqueous chemical solution in a reaction vessel, the temperature of the reaction vessel is maintained at 60-95° C., and the resulting mixture is stirred at 50-100 rpm for 1-5 hr, and the resulting mixture is obtained by immersing the carrier in the aqueous chemical solution; and (C) the chemical adsorbent includes a drying step of stirring the resultant mixture at 50-100 rpm for 1-5 hr, and then stirring the mixture at 100-300 rpm for 4-10 hr while maintaining the temperature of the reaction vessel at 105-130° C., and evaporating and removing moisture until the moisture content of the chemical adsorbent impregnated with the chemical agent is 5-25%; The carrier as the adsorbent is an organic, inorganic, or organic-inorganic carrier in the form of pellets, flakes, granules, or spheres having a diameter of 1 to 7 mm and a length of up to 7 mm; Dry air is supplied at a pressure of 6 to 9 kgf / cm 2 simultaneously with the drying step or at an intermediate point in the drying step; The temperature of the reaction vessel is controlled by a heating oil jacket surrounding the reaction vessel; The impregnation and drying steps are carried out in a batch system in the same reactor; A method for manufacturing a chemical adsorbent for removing harmful gases.

2. A reaction vessel having an external heating oil jacket formed thereon; an impeller located in the reaction vessel and installed at a lower end of an agitation shaft on which a number of air nozzles are formed at predetermined intervals; a motor and an air compressor connected to the agitator shaft; 2. An apparatus for producing a chemical adsorbent for removing harmful gases, for carrying out the method according to claim 1.

3. 3. The apparatus for producing a chemical adsorbent for removing harmful gases according to claim 2, further comprising a rotating means for enabling said reaction vessel to be tilted.

4. The vertical interval between the multiple air nozzles formed on the stirring shaft is 50 to 150 mm, the distance from the center of the stirring shaft to the inner circumferential surface of the reaction vessel is 450 to 650 mm, and the distance from the lowest nozzle to the bottom surface of the reaction vessel is a maximum of 300 mm; 3. The apparatus for producing a chemical adsorbent for removing harmful gases according to claim 2, wherein a plurality of said air nozzles are formed at the same height of said stirring shaft.

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