Methods and apparatuses for utilizing zeolites, and adsorbent zeolites used therein.

Abstract

This invention provides a method and apparatus for utilizing zeolite, as well as an adsorbent zeolite used therein, which can reduce costs by adsorbing CO2 or ammonia with zeolite, transporting the zeolite itself, and desorbing the CO2 or ammonia from the zeolite. [Solution] The method comprises the steps of: making natural zeolite itself, or natural zeolite that has undergone a predetermined pretreatment, into an adsorbent zeolite that adsorbs CO2 or ammonia as a substance to be adsorbed; adsorbing the substance to be adsorbed with the adsorbent zeolite; transporting the adsorbent zeolite itself that has adsorbed the substance to be adsorbed from a first position where the substance to be adsorbed has been adsorbed to a second position different from the first position; and desorbing the substance to be adsorbed from the adsorbent zeolite at the second position.

Description

Technical Field

[0001] The present invention relates to a method and apparatus for using zeolite, and an adsorbent zeolite used therefor.

Background Art

[0002] Carbon dioxide (CO2) is known as a greenhouse gas while being a substance having an important role in industry and nature. It is essential for plant photosynthesis and is also a fundamental component that supports the carbon cycle of the earth. Incidentally, it is known that plant growth is promoted by increasing the CO2 concentration during the time when photosynthesis is active by sunlight during the day in greenhouse cultivation (Patent Document 1). And CO2 is also used as carbonated beverages, dry ice, welding shielding gas, chemical raw materials, etc. in the industrial field. In recent years, research on CCU technology for recycling recovered CO2 into fuels and chemicals has also advanced, and its value as a resource has been reevaluated.

[0003] Also, ammonia (NH3) is an important chemical substance containing nitrogen and is a fundamental substance that supports global food production, especially as a raw material for fertilizers. Most nitrogen fertilizers are produced from ammonia and have greatly contributed to improving the yields of agricultural crops. And in the chemical industry, it is also used as a raw material for synthetic resins, fibers, pharmaceuticals, etc. Furthermore, in recent years, due to its characteristic of not emitting CO2 during combustion, its use as a hydrogen carrier and clean fuel has also attracted attention.

[0004] Thus, CO2 and ammonia are substances that are each used for multiple purposes, but regarding their transportation, in the case of CO2, after recovery, it is compressed and liquefied at high pressure and transported by pipelines, tank lorries, ships, etc. This is because if CO2 is transported in a gaseous state, its volume becomes large and the transportation efficiency deteriorates. Also, in the case of ammonia, since it can be liquefied at a relatively low pressure even near room temperature, it is transported as a liquid by a pressurized tank or a cooling tank.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Patent No. 7043806 [Overview of the project] [Problems that the invention aims to solve]

[0006] However, conventional technologies for transporting CO2 and ammonia as liquids to their respective locations incur significant costs associated with liquefaction, as well as substantial costs for maintaining the liquefied state during transport (a combination of low-temperature maintenance, pressurization, insulation, and boil-off gas management).

[0007] The object of the present invention is to provide a method and apparatus for utilizing zeolite, as well as an adsorbent zeolite used therein, which can reduce costs by adsorbing CO2 or ammonia with zeolite, transporting the zeolite itself, and desorbing the CO2 or ammonia from the zeolite. [Means for solving the problem]

[0008] To achieve the above objective, the method of using zeolite according to the present invention involves using natural zeolite itself, or natural zeolite that has undergone a predetermined pretreatment, as the adsorbed substance. ammonia The steps include: preparing an adsorbent zeolite that adsorbs the substance, The steps include adsorbing the substance to be adsorbed with the adsorbent zeolite, From the first position where the adsorbed substance is adsorbed to a second position different from the first position, the adsorbed zeolite itself that has adsorbed the adsorbed substance is moved. By means of transport The steps for transporting, The steps include: desorbing the adsorbed substance from the adsorbent zeolite at the second position; of Yes, The ammonia desorbed from the adsorbent zeolite is used for hydrogen production, fuel utilization, or at least one of fuel production or fertilizer production. It is characterized by the following:

[0009] Furthermore, another method of using zeolite according to the present invention involves using natural zeolite itself, or natural zeolite that has undergone a predetermined pretreatment, as the adsorbed substance. ammonia The steps include: preparing an adsorbent zeolite that adsorbs the substance, The steps include adsorbing the substance to be adsorbed with the adsorbent zeolite, From the first position where the adsorbed substance is adsorbed to a second position different from the first position, the adsorbed zeolite itself that has adsorbed the adsorbed substance is moved. By means of transport The steps for transporting, The steps include: desorbing the adsorbed substance from the adsorbent zeolite at the second position; of Yes, The aforementioned pretreatment includes a heat dehydration treatment, and further an ion exchange treatment to Na-type zeolite. acid Including at least one of the processes It is characterized by the following:

[0010] Furthermore, another method of using zeolite according to the present invention involves using natural zeolite itself, or natural zeolite that has undergone a predetermined pretreatment, as an adsorbent substance. CO The step of using an adsorbent zeolite that adsorbs 2, The steps include adsorbing the substance to be adsorbed with the adsorbent zeolite, From the first position where the adsorbed substance is adsorbed to a second position different from the first position, the adsorbed zeolite itself that has adsorbed the adsorbed substance is moved. By means of transport The steps for transporting, The steps include: desorbing the adsorbed substance from the adsorbent zeolite at the second position; of Yes, CO desorbed from the adsorbent zeolite 2 However, it is used for greenhouse cultivation. Furthermore, the first and second adsorb nitrogen, phosphorus, and potassium, which are fertilizer components for greenhouse cultivation, at their respective first positions as the adsorbed substances. 、 It has a third adsorbent zeolite, and at the second position, which is the greenhouse position, it desorbs nitrogen, phosphorus, and potassium, which are the fertilizer components, to produce fertilizer. It is characterized by the following: And preferably, the adsorption zeolite for adsorbing CO2 for greenhouse cultivation functions as the first adsorption zeolite that adsorbs CO2 and ammonia and adsorbs the nitrogen.

Advantages of the Invention

[0011] According to the present invention, by adsorbing CO2 or ammonia with zeolite, transporting the zeolite itself, and desorbing CO2 or ammonia from the zeolite, cost reduction can be achieved.

Brief Description of the Drawings

[0012] [Figure 1] It is an explanatory diagram regarding an embodiment of the present invention in which natural zeolite is pretreated to obtain an adsorption zeolite. [Figure 2] It is an explanatory diagram regarding a flow of adsorbing CO2 or ammonia with zeolite, transporting the zeolite itself, and desorbing CO2 or ammonia from the zeolite. [Figure 3] It is an explanatory diagram in which synthetic zeolite is pretreated to obtain an adsorption zeolite.

Modes for Carrying Out the Invention

[0013] Embodiments of the present invention will be described below. Although natural zeolite itself can be used as the adsorption zeolite for adsorbing CO2 or ammonia as the adsorbed substance, it is more preferable to use natural zeolite that has been subjected to a predetermined pretreatment. Here, the pretreatment means performing at least one of chemical treatment, heat treatment, mixing treatment with substances other than zeolite, etc. on natural zeolite before actually adsorbing CO2 or ammonia.

[0014] As a result, for example, if a standard zeolite is prepared by pre-treating natural zeolite in some way, and then further pre-treating this standard zeolite with a substance other than zeolite (further pre-treatment) before actually adsorbing CO2 or ammonia, the zeolite resulting from that pre-treatment will become an adsorbent zeolite. Also, if the standard zeolite has undergone the above pre-treatment and is used as is to adsorb CO2 or ammonia, then that standard zeolite will become an adsorbent zeolite.

[0015] (First Reference example ) Book Reference example As shown in Figure 2, this method involves transporting the adsorbent zeolite itself, which has adsorbed CO2 as the adsorbed substance at the first position 1, and then desorbing the CO2 at the second position 2 to utilize the zeolite in industries other than agriculture (clean gas generation).

[0016] (Natural zeolite) The natural zeolite used in this embodiment has a silica composition ratio of 4.5 to 5.5 to alumina, and contains mordenite in addition to clinoptilolite as the main component. The mixing ratio of clinoptilolite to mordenite is 9:1. It is then cut into pieces of 3 mm to 5 mm in size to increase its specific surface area. (Adsorbent zeolite) As a zeolite that adsorbs CO2 necessary for clean gas generation, natural zeolite itself can be used, or zeolite that has undergone a predetermined pretreatment can be used (Figure 1). When pretreating for CO2 adsorption, it is important to "make the pores of the zeolite usable" and "strengthen the interaction with CO2." To make the pores of the zeolite usable, it is important to preheat and dehydrate it. Since water is adsorbed preferentially over CO2, reducing water competition improves CO2 adsorption.

[0017] Furthermore, to enhance the interaction with CO2, assuming prior heating and dehydration, at least one of ion exchange treatment or amine modification treatment is performed. Regarding ion exchange treatment, the zeolite skeleton has a negative charge and is neutralized by cations such as Na, and changing these cations strengthens the electrostatic interaction with CO2. That is, for example, changing the Na type to Ca type, K type, or Li type (further Ca ion exchange, K ion exchange, and Li ion exchange on a zeolite that has already undergone Na ion exchange (Na type)) improves CO2 adsorption. As for amine modification treatment, amine groups are supported in the pores or on the surface to impart a chemiadsorption effect. Based on the above, in this embodiment, the pretreatment includes a heat dehydration treatment, and further includes at least one of an ion exchange treatment and an amine modification treatment.

[0018] (A place where high-concentration CO2 is adsorbed by adsorbent zeolite) Locations where CO2 exists at concentrations higher than the standard concentration (high concentration) include various places in nature such as volcanic areas, caves, around fumaroles in hot spring areas, and the deep layers of lakes, as well as artificial locations such as factories, breweries, underground parking lots, and thermal power plants. In this embodiment, however, we consider biogas facilities as the location for adsorbing high-concentration CO2 with zeolite. This is because biogas facilities require CO2 removal in order to purify biogas into biomethane equivalent to city gas, and since CO2 separation is already necessary in such locations, the introduction of zeolite is highly rational. Of course, this invention is not limited to biogas facilities, but also includes cases where CO2 is adsorbed with adsorbent zeolite in locations other than biogas facilities.

[0019] (Transportation of the adsorbent zeolite itself that has adsorbed high-concentration CO2) Compared to conventional technologies that transport CO2 through pipes and other piping, in this embodiment, as shown in Figure 2, the adsorbent zeolite itself, which has adsorbed high-concentration CO2 at the first location 1, can be transported to the clean gas generation location (second location 2) by cargo truck, helicopter, drone, etc., thus significantly reducing the costs associated with transporting CO2 to the clean gas generation location. Here, the reason why the CO2 adsorbed by the adsorbent zeolite does not desorb from the adsorbent zeolite during transport is due to strong physical adsorption within the pores of the adsorbent zeolite, and also because, under normal transport conditions (small temperature changes, no pressure changes, no strong airflow), almost no desorption driving force is generated.

[0020] (Desorption of high-concentration CO2 at the clean gas generation site) Desorption requires energy input such as heating, depressurization, and purge gas introduction. In this embodiment, the zeolite adsorbing high-concentration CO2 is heated by a heating means to desorb the CO2. Specifically, the zeolite adsorbing high-concentration CO2 at the clean gas generation location is introduced into a sealed regeneration device and heated to 150-250°C to release the CO2, which is then diffused by a fan. After confirming an increase in concentration, the heating is stopped. Typical methods for producing clean gas include the following: reacting CO2 with hydrogen (H2) to produce methane (CH4) or carbon monoxide (CO). Methane is equivalent to natural gas and can utilize existing infrastructure. CO is also used as a raw material for synthesis gas (CO + H2) and is used in the manufacture of fuels and chemicals. The reaction equation is shown below. CO2 + 4H2 → CH4 + 2H2O CO2 + H2 → CO + H2O (Second Reference example ) Book Reference example The first Reference example This method conforms to the standard, but involves transporting the adsorbent zeolite itself, which is derived from natural zeolite that has adsorbed CO2, and then desorbing the CO2 for use in agriculture (greenhouse cultivation).

[0021] Plants produce CO2 + water → carbohydrates (sugars) + oxygen through photosynthesis. In other words, CO2 is important for photosynthesis to occur even in greenhouse cultivation. However, because a greenhouse is a closed space, during the daytime when sunlight shines, the CO2 inside the greenhouse is consumed by photosynthesis, and unlike outdoors, air movement does not deliver new CO2, causing the CO2 concentration to decrease. Therefore, by desorbing CO2 from adsorbent zeolite during the daytime when photosynthesis occurs, the CO2 concentration inside the greenhouse can be increased. Furthermore, during the time when photosynthesis occurs in the greenhouse (daytime), the adsorbent zeolite is heated to desorb (release) CO2, while during the time when photosynthesis does not occur (nighttime), the heating of the adsorbent zeolite is stopped, allowing the adsorbent zeolite to adsorb CO2 in the greenhouse.

[0022] Here, while the standard CO2 concentration in the outside air is around 400 ppm, the CO2 concentration suitable for greenhouse cultivation is considered to be 1000-2000 ppm. Therefore, a corresponding amount of zeolite that adsorbs high-concentration CO2 is required. In other words, if the current concentration is 400 ppm, the target concentration is 1500 ppm, and the greenhouse volume is V m³, then the required CO2 volume = V × (1500 - 400) / 10⁶. For example, if the greenhouse volume V = 1000 m³, then the required CO2 volume is 1.1 m³. And since the density of CO2 (at room temperature and pressure) is 1.8 kg / m³, the mass of CO2 is approximately 2 kg. For zeolites used for CO2 adsorption, the amount of CO2 adsorbed is typically around 0.15 to 0.25 kg per 1 kg of zeolite, so approximately 10 kg of zeolite is required.

[0023] (No. 1 (Embodiment) This embodiment is the second Reference exampleBased on this premise, the system further involves transporting adsorbent zeolite derived from natural zeolite that adsorbs each of the fertilizer components N (nitrogen), P (phosphorus), and K (potassium), and then desorbing each component at the greenhouse location (including the vicinity of the greenhouse) to produce fertilizer. The adsorbent zeolites that adsorb each of the components N (nitrogen), P (phosphorus), and K (potassium) are referred to here as the first, second, and third adsorbent zeolites. According to this embodiment, it is possible to respond flexibly to situations such as when fertilizer is suddenly needed in the greenhouse location where greenhouse cultivation is performed, exceeding the stockpiled amount, or when it becomes necessary to change the ratio of fertilizer components in the fertilizer as an attempt at variety improvement. Furthermore, since the zeolite itself is transported to the greenhouse location, transportation costs can be reduced, as in the first and second embodiments.

[0024] (Adsorbent zeolite) In this embodiment as well, natural zeolite itself can be used as the adsorbent zeolite that adsorbs the fertilizer components necessary for greenhouse cultivation, or zeolite that has undergone a predetermined pretreatment can be used. A preferred form of pretreatment is described below. When using adsorbed zeolite that has undergone a predetermined pretreatment from natural zeolite, the pretreatment includes drying and ion exchange treatment to the Na type for the first zeolite for N (nitrogen). For the second zeolite for P (phosphorus), it includes Fe loading treatment. For the third zeolite for K (potassium), it includes ion exchange treatment to the Na type, followed by K+ ion exchange treatment.

[0025] In this way, regarding nitrogen (N) as a fertilizer component, ammonium ions are adsorbed by the first zeolite of the Na type. Regarding phosphorus (P), phosphate salts are adsorbed by the second zeolite supported with metal (especially Fe). Regarding potassium (K), potassium ions are adsorbed by the third zeolite of the Na type.

[0026] (A place where high concentrations of fertilizer components are adsorbed by zeolite) For fertilizer components N (nitrogen), P (phosphorus), and K (potassium), locations where they exist at concentrations higher than the standard concentration (high concentration) are preferable for adsorption by zeolite. For N (nitrogen), locations where livestock biogas digestate is present are preferable; for P (phosphorus), locations where sewage treatment plant sludge and food factory wastewater are present are preferable; and for K (potassium), locations where wood ash extract and digestate are present are preferable.

[0027] Of course, this invention is not limited to these examples, but also includes adsorption in locations where each fertilizer component is present in high concentrations. For N (nitrogen), locations such as sewage treatment plants and food factory wastewater are possible; for P (phosphorus), locations such as laundry wastewater are possible; and for K (potassium), locations such as food processing wastewater, sewage sludge digestate, and chemical fertilizer factory wastewater are possible.

[0028] Here, the first to third zeolites described above can be used in different locations for each fertilizer component they adsorb, or two of N, P, and K can be used in the same location, or all of N, P, and K can be used in the same location. If all of N, P, and K are used in the same location, it can be the location of livestock wastewater or sewage digestate.

[0029] (A place where high concentrations of CO2 and fertilizer components are adsorbed by zeolite) The location for CO2 adsorption described in the first and second embodiments and the locations for adsorption of each fertilizer component using the first to third zeolites of this embodiment can be separate, or the location for CO2 adsorption and one of the locations for N, P, and K can be the same. Furthermore, the same location can be used for all of CO2, N, P, and K. If the same location is used for all of CO2, N, P, and K, it is considered that the location would be one that can adsorb biogas (gas phase) generated from facilities related to livestock wastewater or sewage digestate.

[0030] (Transportation of zeolite itself that has adsorbed high-concentration fertilizer components) First, second Reference exampleSimilarly, since the adsorbent zeolite itself, which has adsorbed fertilizer components, can be transported to the greenhouse location (including nearby locations) by cargo trucks, helicopters, drones, etc., the costs associated with transporting it to the greenhouse location are kept low. The reason why the fertilizer components (N, P, K) adsorbed by the adsorbent zeolite do not desorb from the zeolite itself during transport is that adsorption is not physical attachment, but rather an equilibrium state based on ion exchange and chemical bonding.

[0031] In other words, regarding N, in the case of Na-type zeolites, it is fixed to the cation sites within the framework by ion exchange, as described below.

[0032] Zeolite-Na + NH4+ → Zeolite-NH4+ Na+ Furthermore, regarding phosphorus (P), in Fe-supported zeolite, phosphoric acid is adsorbed via Fe-O-PO4 coordination bonds, resulting in an equilibrium state based on chemical bonding. Desorption requires strong alkali (NaOH) and high pH conditions, and the system is extremely stable under neutral and dry transport conditions. Regarding potassium (K), K ions are adsorbed and retained at cation sites within the pores of the zeolite, and are not removed by simple vibration or movement.

[0033] (Attachment and detachment in a greenhouse setting) Regarding the first to third zeolites, which have been transported to the greenhouse location, the first zeolite is desorbed by washing it with water at the greenhouse location (generating an ammonium solution). Alternatively, the first zeolite can also be desorbed by heating it at the greenhouse location. For the second zeolite, the phosphate is desorbed using an alkaline solution (NaOH solution or KOH solution) in the greenhouse (to produce a phosphate liquid fertilizer). For the third zeolite, the zeolite is not desorbed in the greenhouse, but is mixed directly into the soil to serve as a soil conditioner and slow-release potassium fertilizer.

[0034] In this embodiment, the desorbed CO2 can also be associated with the desorption of fertilizer components. That is, the desorption can be promoted by bubbling the CO2 described in the second embodiment into the ammonium solution described in this embodiment. Furthermore, in this embodiment, the adsorbent zeolite for adsorbing CO2 for greenhouse cultivation can also function as a first adsorbent zeolite that adsorbs CO2 and ammonia, and also adsorbs nitrogen.

[0035] (No. 2 (Embodiment) This embodiment is 1 As a variation of the embodiment, a pretreatment including a mixing treatment with hydrotalcite is included. When hydrotalcite is mixed with CO2-adsorbing zeolite, the hydrotalcite can compensate for the decrease in zeolite's adsorption rate at temperatures higher than room temperature (below 200°C). In other words, hydrotalcite can adsorb CO2 well in temperature ranges higher than room temperature.

[0036] Regarding the mixing of zeolite and hydrotalcite, the mixing may be carried out at the pretreatment stage for creating the standard zeolite (before the standard zeolite is completed) as described above, or it may be carried out at the standard zeolite stage after the prescribed pretreatment (after the pure zeolite is completed).

[0037] (No. 3 (Embodiment) As shown in Figure 2, this embodiment involves transporting the adsorbent zeolite itself, which has adsorbed ammonia as the adsorbed substance at the first position 1, and then desorbing the ammonia at the second position 2 to utilize the zeolite for industries other than agriculture (hydrogen production). In this embodiment, the transportation of natural zeolite and the adsorbent zeolite itself will be in accordance with the first to third embodiments. As a result, in this embodiment, the adsorbent zeolite itself that has adsorbed high concentrations of ammonia can be transported to the hydrogen production site by cargo truck, helicopter, drone, etc., thereby significantly reducing the costs associated with transporting ammonia to the hydrogen production site. Ammonia is a compound that contains hydrogen at a high density and is attracting attention as a hydrogen carrier. Since nitrogen and hydrogen are produced when ammonia is decomposed, hydrogen can be manufactured using this reaction. Specifically, a common method involves using a catalyst to decompose ammonia at high temperatures to extract hydrogen. The hydrogen produced in this way is used in fuel cells and industrial fuels, and is expected to be an energy source that contributes to the realization of a decarbonized society.

[0038] (Adsorbent zeolite) While natural zeolite itself can be used as an adsorbent zeolite, it is preferable to perform the following pretreatment on the natural zeolite. Specifically, the zeolite is converted to a Na-type zeolite by ion exchange treatment, and then converted to an H-type zeolite by acid treatment. This strengthens the acid-base interaction with ammonia. Furthermore, it is heated to about 300-500°C to remove adsorbed water and impurities from inside the pores. This opens the pores and increases the ammonia adsorption capacity. In addition, a metal (Cu, Zn, Fe, or Ag) is introduced as needed. This increases the coordination interaction with ammonia.

[0039] (A place where high-concentration ammonia is adsorbed by adsorbent zeolite) Locations that have ammonia production facilities (synthesis equipment and storage facilities), fertilizer manufacturing plants and urea production facilities, livestock facilities (pig and poultry farms), sewage treatment facilities and sludge treatment facilities, and combustion exhaust gas treatment facilities (SCR and SNCR denitrification facilities) are considered to be the relevant locations.

[0040] (Desorption of high-concentration ammonia at the hydrogen generation site) Desorption requires energy input through heating, reduced pressure (vacuum), flowing a purge gas (such as N2), or steam desorption (replacement with steam). In this embodiment, ammonia is desorbed by heating to 150-400°C. Then, to generate hydrogen, a catalyst (such as Ru, Ni, or Fe) is used, and the mixture is heated to approximately 400-700°C. The reaction equation is as follows. 2NH3 → N2 + 3H2 (No. 4 (Embodiment) This embodiment involves transporting adsorbent zeolite derived from natural zeolite that adsorbs ammonia, desorbing ammonia from it, and using it in industries other than agriculture, particularly as fuel and in the production of various fuels. Ammonia is a carbon-free fuel, meaning it does not emit carbon dioxide when burned. For this reason, research and practical applications for its direct combustion use as boiler fuel, gas turbine fuel, and marine fuel are progressing. For example, ammonia can be supplied to industrial boilers and burned to generate steam, which can then be used as a heat source in factories. Furthermore, development of ammonia-fueled engines is underway as an alternative to heavy oil in ships, and this technology is expected to contribute to the decarbonization of the shipping sector.

[0041] Furthermore, ammonia can be used not only as a fuel itself, but also as a raw material for producing various fuels. For example, by using hydrogen obtained by decomposing ammonia and reacting it with carbon dioxide, it is possible to produce carbon-recycled fuels such as methanol and synthetic fuels. In the power generation sector, technology is being considered to co-fire coal and ammonia in coal-fired power plants, which can reduce carbon dioxide emissions while utilizing existing power generation facilities. It can also be used as a co-firing fuel in gas turbine power generation, contributing to the construction of a decarbonized energy system. Here, the adsorbent zeolite and the like in this embodiment are in accordance with the fifth embodiment.

[0042] (No. 5 (Embodiment) This embodiment involves transporting adsorbent zeolite derived from natural zeolite that adsorbs ammonia, and using it for agricultural purposes by desorbing ammonia (using it as fertilizer in terms of the nitrogen component N of the fertilizer). This embodiment is based on the third embodiment which describes the case with respect to N (nitrogen).

[0043] Ammonia is a valuable resource as a fertilizer because it is rich in nitrogen. By using adsorbent zeolite to adsorb ammonia from exhaust gases and wastewater, and then desorbing it in a greenhouse through heating and reduced pressure, ammonia can be recovered and utilized. The desorbed ammonia is supplied to crops in the greenhouse as a nitrogen source and can be used as a fertilizer to promote plant growth. This method aims to recycle ammonia and reduce the amount of chemical fertilizers used from external sources, and is therefore expected to be a technology that contributes to resource-recycling agriculture and the reduction of environmental impact.

[0044] (No. 6 (Embodiment) The 3 to the first 5 As a variation of the embodiment, a mixing treatment with hydrotalcite is included as a pretreatment. When hydrotalcite is mixed as an adsorbent zeolite that adsorbs ammonia, the amount of ammonia adsorbed can be increased.

[0045] Regarding the mixing of zeolite and hydrotalcite, the mixing may be carried out at the pretreatment stage for creating the standard zeolite (before the standard zeolite is completed) as described above, or it may be carried out at the standard zeolite stage after the prescribed pretreatment (after the pure zeolite is completed).

[0046] (Zeolite utilization equipment, adsorbent zeolite) Although various embodiments of methods for utilizing zeolite have been described above, the present invention also includes zeolite utilization devices. Specifically, zeolite utilization devices include those equipped with adsorbent zeolite and means for desorption (e.g., heating means). Furthermore, the invention also includes adsorbent zeolite directly used in carrying out methods for utilizing zeolite.

[0047] (modified version) Although preferred embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications and changes are possible within the scope of its gist. For example, synthetic zeolite can be used instead of natural zeolite, and even zeolite that has been pretreated from synthetic zeolite can be used (Figure 3). Synthetic zeolites, like natural zeolites, are crystalline materials with a three-dimensional aluminosilicate (Al-Si-O) framework. This framework contains regularly arranged pores, channels, and cages, and these structures give rise to ion exchange and adsorption properties.

[0048] Natural zeolites have advantages such as low cost, easy mass supply, relatively high mechanical strength and durability, and low environmental impact due to natural fluctuations. However, they also have disadvantages such as non-uniform crystal structure and chemical composition, unoptimized Si / Al ratio and pore size, and the presence of impurities. Synthetic zeolites overcome these disadvantages. Specifically, synthetic zeolites allow for arbitrary design of Si / Al ratio, pore size, and crystal form, enabling them to exhibit performance optimized for specific substances. Furthermore, they have a larger surface area and higher adsorption capacity than natural zeolites, as well as higher ion exchange capacity. In addition, as industrial products, their quality and performance are uniform. Moreover, their performance can be enhanced according to the purpose through organic modification (amine modification), metal ion exchange, acid treatment, etc. When using synthetic zeolites instead of natural zeolites, typical synthetic zeolites that can be used include zeolite Y(FAU), zeolite (FAU), and zeolite A(LTA).

[0049] Furthermore, although the embodiments described above show typical applications for CO2 and ammonia, the present invention is not limited to such applications, but also involves adsorbing CO2 or ammonia with an adsorbent zeolite, transporting the adsorbent zeolite itself to a second position, and desorbing at the second position. This includes all cases where CO2 or ammonia is used as a resource (for example, using CO2 as a raw material for chemical reactions or for food applications such as dry ice, and using ammonia as a chemical raw material or refrigerant).

[0050] Also, as mentioned above Reference examples 1 and 2, embodiments 1 and 2 The CO2 adsorption zeolite explained above, and the above Embodiments 3 to 6 Using the ammonia-adsorbing zeolite described above, and using the desorbed CO2 and ammonia respectively, the first Reference example It can produce clean gases such as methane (CH4) and carbon monoxide (CO), as explained earlier. [Explanation of symbols]

[0051] 1. First position (adsorption position), 2. Second position (detachment position)

Claims

1. The process involves a step of using natural zeolite itself, or natural zeolite that has undergone a predetermined pretreatment, to make it an adsorbent zeolite that adsorbs ammonia as the substance to be adsorbed, The steps include adsorbing the substance to be adsorbed with the adsorbent zeolite, The steps include transporting the adsorbent zeolite itself, which has adsorbed the adsorbent substance, from a first position where the adsorbent substance is adsorbed to a second position different from the first position, using a transport means, The steps include: desorbing the adsorbed substance from the adsorbent zeolite at the second position; It has, A method for utilizing zeolite, characterized in that the ammonia desorbed from the adsorbent zeolite is used for hydrogen production, fuel utilization, or at least one of fuel production or fertilizer production.

2. The process involves a step of using natural zeolite itself, or natural zeolite that has undergone a predetermined pretreatment, to make it an adsorbent zeolite that adsorbs ammonia as the substance to be adsorbed, The steps include adsorbing the substance to be adsorbed with the adsorbent zeolite, The steps include transporting the adsorbent zeolite itself, which has adsorbed the adsorbent substance, from a first position where the adsorbent substance is adsorbed to a second position different from the first position, using a transport means, The steps include: desorbing the adsorbed substance from the adsorbent zeolite at the second position; It has, A method for utilizing zeolite, characterized in that the aforementioned pretreatment includes a heat dehydration treatment, and further includes at least one of an ion exchange treatment or an acid treatment for Na-type zeolite.

3. The process involves using natural zeolite itself, or natural zeolite that has undergone a predetermined pretreatment, to create an adsorbent zeolite that adsorbs CO2 as the substance to be adsorbed, The steps include adsorbing the substance to be adsorbed with the adsorbent zeolite, The steps include transporting the adsorbent zeolite itself, which has adsorbed the adsorbent substance, from a first position where the adsorbent substance is adsorbed to a second position different from the first position, using a transport means, The steps include: desorbing the adsorbed substance from the adsorbent zeolite at the second position; It has, The CO2 desorbed from the adsorbent zeolite is used for greenhouse cultivation. Furthermore, the zeolite has first, second, and third adsorbent zeolites that adsorb nitrogen, phosphorus, and potassium, which are fertilizer components for greenhouse cultivation, at their respective first positions, and the zeolite is characterized by producing fertilizer by desorbing the nitrogen, phosphorus, and potassium at the second position, which is the greenhouse position. 【Request Item 4】 CO2 for greenhouse cultivation ２ The adsorbent zeolite that adsorbs CO ２ A method for using the zeolite according to claim 3, wherein the zeolite functions as the first adsorbent zeolite that adsorbs ammonia and the nitrogen.

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