WO2022259929A1 - 二酸化炭素の固体回収材及びその製造方法 - Google Patents

二酸化炭素の固体回収材及びその製造方法 Download PDF

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WO2022259929A1
WO2022259929A1 PCT/JP2022/022250 JP2022022250W WO2022259929A1 WO 2022259929 A1 WO2022259929 A1 WO 2022259929A1 JP 2022022250 W JP2022022250 W JP 2022022250W WO 2022259929 A1 WO2022259929 A1 WO 2022259929A1
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Prior art keywords
carbon dioxide
recovery material
weight
solid recovery
material according
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English (en)
French (fr)
Japanese (ja)
Inventor
宗由 坂本
満也 柴
伸哉 志茂
栄一 栗田
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Toda Kogyo Corp
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Toda Kogyo Corp
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Priority to EP22820111.7A priority Critical patent/EP4353353A4/en
Priority to JP2023527640A priority patent/JPWO2022259929A1/ja
Priority to KR1020237045078A priority patent/KR20240018521A/ko
Priority to US18/567,327 priority patent/US20250083121A1/en
Priority to CN202280040686.XA priority patent/CN117460576A/zh
Publication of WO2022259929A1 publication Critical patent/WO2022259929A1/ja
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Definitions

  • the present invention relates to a solid recovery material that fixes carbon dioxide and a method for producing the same, and more particularly to a solid recovery material containing sodium ferrite and a method for producing the same.
  • Patent Documents 1 and 2 disclose carbon dioxide recovery materials containing sodium ferrite.
  • ⁇ -sodium ferrite having a layered rock salt structure causes a topochemical reaction between carbon dioxide and sodium. That is, during the reaction with carbon dioxide, ⁇ -sodium ferrite becomes a mixed phase of Na 1-x FeO 2 and sodium carbonate.
  • reaction rate is high and the carbon dioxide absorption/desorption repeatability of the reaction is excellent.
  • sodium reacts with carbon dioxide in orthorhombic ⁇ -sodium ferrite, it has been reported that the crystalline phase of ⁇ -sodium ferrite absorbs more carbon dioxide than the crystalline phase of ⁇ -sodium ferrite. ing.
  • the formula for reacting sodium ferrite with carbon dioxide is NaFeO 2 + 1/2CO 2 ⁇ 1/2Na 2 CO 3 + 1/2Fe 2 O 3 when the gas does not contain water vapor, and NaFeO 2 + CO2 +1/ 2H2O ⁇ NaHCO3 + 1 / 2Fe2O3 . Therefore, it theoretically has the ability to adsorb and desorb up to 18 to 28% by weight of carbon dioxide with respect to sodium ferrite.
  • the carbon dioxide solid recovery materials described in Patent Documents 1 and 2 contain sodium ferrite as described above, and are considered to be solid recovery materials having relatively good carbon dioxide absorption performance in a low temperature range. be done.
  • a carbon dioxide recovery material with higher carbon dioxide fixation and recovery performance There is a need to. Specifically, it is difficult to handle sodium ferrite powder as it is in powder form. It is used after being granulated. Therefore, the composition and physical properties of the carbon dioxide recovery material in which sodium ferrite is granulated are also important.
  • the present invention has been made in view of the above problems, and its object is to be able to fix carbon dioxide in a low temperature range from room temperature to 200 ° C., recover carbon dioxide by heating at 50 ° C. to 200 ° C., An object of the present invention is to provide a carbon dioxide solid recovery material excellent in fixed recovery performance, and a method for producing the same.
  • sodium ferrite is molded using an organic binder or an inorganic binder under predetermined conditions, thereby adsorbing carbon dioxide in a temperature range from room temperature to 200 ° C.
  • the carbon dioxide adsorbed by heating at ⁇ 200°C can be recovered with high efficiency.
  • the carbon dioxide solid recovery material according to the present invention contains 50% to 99% by weight of sodium ferrite and 1% to 50% by weight of an organic binder or an inorganic binder.
  • the average particle diameter is 1 mm to 10 mm
  • the specific surface area is 1 m 2 /g to 50 m 2 /g
  • the ratio of the average major axis diameter to the average minor axis diameter of the primary particles of the sodium ferrite is 1 ⁇ 2.
  • the organic binder or inorganic binder can promote aggregation of sodium ferrite particles to form a compact containing sodium ferrite at a high concentration. Therefore, the carbon dioxide solid recovery material according to the present invention containing sodium ferrite and an organic binder or an inorganic binder has the excellent property of adsorbing carbon dioxide in gas, confining it in the solid, and releasing carbon dioxide by heating. can have In addition, when the average particle diameter is 1 mm to 10 mm, it is possible to secure a distribution route for exhaust gas and the like without reducing pressure loss caused by dense fine powder when packed in an adsorption tower or the like. . As a result, carbon dioxide can be efficiently fixed.
  • the carbon dioxide solid recovery material according to the present invention can fix carbon dioxide in a temperature range from room temperature to 200 ° C., can be recovered by heating at 50 ° C. to 200 ° C., and has excellent fixed recovery performance. .
  • the carbon dioxide solid recovery material according to the present invention preferably has a hardness of 3 kgf/mm 2 to 30 kgf/mm 2 and an axial ratio of 1 to 5.
  • the powder pH value is preferably 8-14.
  • the carbon dioxide solid recovery material according to the present invention is basic, it becomes easier to capture weakly acidic carbon dioxide.
  • the sodium ferrite preferably has a Na/Fe molar ratio of 0.7 to 1.3.
  • the carbon dioxide solid recovery material according to the present invention preferably contains the organic binder, and the organic binder is preferably a polymeric material selected from polystyrene, polyethylene, polypropylene, nitrile butadiene, silicone, fluororesin and cellulose. .
  • the organic binder By using the organic binder, it is possible to form a compact containing sodium ferrite at a high concentration, and the carbon dioxide fixation and recovery performance can be improved.
  • the carbon dioxide solid recovery material according to the present invention contains the inorganic binder, and the inorganic binder contains one or more of Na, Li, K, Ca, Mg, Si, Al, Ca, Fe and Zn. Materials are preferred.
  • the inorganic binder By using the inorganic binder, it is possible to form a molded body containing a high concentration of sodium ferrite, and the carbon dioxide fixation and recovery performance can be improved.
  • the method for producing a carbon dioxide solid recovery material according to the present invention comprises the steps of subjecting a material containing iron oxide and an alkali compound containing sodium to a solid phase reaction, and adding an organic binder to the powder obtained by the solid phase reaction. Alternatively, the step of kneading and molding an inorganic binder is included.
  • a solid and a solid are mixed and reacted by moving elements without using a solvent. It is possible to reduce waste such as solvent when used. In particular, in the case of a solid-phase reaction at a low temperature, an extremely high-concentration reaction can be performed, so the energy cost can be kept low. Therefore, according to the method for producing a carbon dioxide fixation and recovery material according to the present invention, carbon dioxide can be fixed in the temperature range from room temperature to 200°C, and the fixed carbon dioxide can be recovered with high efficiency by heating at 50°C to 200°C. , can produce carbon dioxide capture materials with excellent fixed recovery performance.
  • carbon dioxide can be fixed in the temperature range from room temperature to 200 ° C., and can be recovered with high efficiency by heating at 50 ° C. to 200 ° C., and excellent carbon dioxide fixation recovery performance. can have
  • thermogravimetric analysis after absorbing carbon dioxide with the carbon dioxide solid recovery material obtained in Example 1.
  • FIG. It is the result of thermogravimetric analysis after absorbing carbon dioxide with the carbon dioxide solid recovery material obtained in Example 10.
  • FIG. 10 It is the result of thermogravimetric analysis after absorbing carbon dioxide with the carbon dioxide solid recovery material obtained in Example 10.
  • the carbon dioxide solid recovery material according to the present embodiment contains 50% to 99% by weight of sodium ferrite and 1% to 50% by weight of an organic or inorganic binder. In the above weight % range, the carbon dioxide solid recovery material according to the present embodiment maintains the carbon dioxide fixation and recovery performance that sodium ferrite inherently possesses, while providing a compact containing sodium ferrite at a high concentration. can be formed.
  • the carbon dioxide solid recovery material according to the present embodiment has an average particle size of 1 mm to 10 mm and a specific surface area of 1 m 2 /g to 50 m 2 /g.
  • the average particle size of the carbon dioxide solid recovery material is preferably 2 mm to 8 mm.
  • the specific surface area of the carbon dioxide solid recovery material is preferably 2 m 2 /g to 30 m 2 /g.
  • the ratio of the average major axis diameter to the average minor axis diameter of the primary particles of sodium ferrite contained is 1 to 2. is preferred. If the axial ratio exceeds 2, the primary particles tend to aggregate, making it difficult to maintain the high dispersibility of the sodium ferrite. Also, the axial ratio cannot be less than one.
  • the axial ratio of the primary particles of sodium ferrite contained is more preferably 1.1 to 1.9.
  • the carbon dioxide solid recovery material according to the present embodiment preferably has a hardness of 3 kgf/mm 2 to 30 kgf/mm 2 .
  • a hardness range when the carbon dioxide recovery material according to the present embodiment is filled in an adsorption tower or the like, it is difficult to break due to gravity and friction due to the flow of exhaust gas, etc., and gases such as exhaust gas can easily flow.
  • the shape of the carbon dioxide solid recovery material according to the present embodiment is not particularly limited, it is preferably columnar, spindle-shaped, cuboid-shaped, dice-shaped, or spherical.
  • the axial ratio is obtained by dividing the length of the major axis of the carbon dioxide solid recovery material by the length of the minor axis, and is preferably 1-5. If the axial ratio exceeds 5, voids are likely to open when the adsorption tower is filled. Also, the axial ratio cannot be less than 1. More preferably, it is 1.5-4.
  • the carbon dioxide solid recovery material according to the present embodiment preferably has a powder pH value of 8-14.
  • the powder pH value is 8 to 14
  • the carbon dioxide solid recovery material according to the present embodiment becomes basic and easily captures weakly acidic carbon dioxide.
  • the carbon dioxide solid recovery material according to the present embodiment preferably has a Na/Fe molar ratio of sodium ferrite of 0.7 to 1.3.
  • a large amount of the sodium ferrite crystal phase can be included, and the carbon dioxide fixation and recovery performance is improved.
  • the organic binder according to this embodiment is preferably a polymeric material selected from polystyrene, polyethylene, polypropylene, nitrile butadiene, silicone, fluororesin and cellulose. Since the organic binder has excellent moldability, it becomes possible to form a molded article containing sodium ferrite at a high concentration, and the ability to fix and recover carbon dioxide can be improved.
  • the organic binder according to this embodiment preferably has a weight average molecular weight of 1,000 to 100,000. If the weight-average molecular weight is less than 1,000, the molded article may be too soft and the strength of the molded article may decrease. When the weight-average molecular weight exceeds 100,000, the organic binder is too hard to form a molded article.
  • the inorganic binder according to this embodiment is preferably an inorganic material containing one or more of Na, Li, K, Ca, Mg, Si, Al, Ca, Fe and Zn. Since the inorganic binder has excellent moldability, it becomes possible to form a molded article containing sodium ferrite at a high concentration, and the ability to fix and recover carbon dioxide can be improved.
  • the inorganic binder is an inorganic material containing one or more of Na, Li, K, Ca, Mg, Si, Al, Ca, Fe and Zn, silicate, metal phosphate, metal Fluid inorganic materials such as alcoholates, organopolysiloxanes, organic-inorganic composite polymers, alumina sol, synthetic mica, phosphonitrile chloride, cement, etc. are kneaded with sodium ferrite, molded into appropriate sizes, and dried by applying thermal energy, etc. It serves as a binder as an inorganic solid.
  • silicates include water-soluble silicates such as sodium silicate, potassium silicate, lithium silicate, and ammonium silicate, colloidal silica, and organometallic siliconate.
  • Metal phosphates include aluminum phosphate, magnesium phosphate, calcium phosphate, iron phosphate and zinc phosphate.
  • metal alcoholates include alcoholates of silicon, aluminum, tin, titanium, zirconium and the like.
  • Organopolysiloxanes include silicones and alkyl silicates such as ethyl silicate, butyl silicate, phenyl silicate, octyl silicate and lauryl silicate.
  • Examples of the organic-inorganic hybrid polymer include mixtures such as emulsion mixtures and aqueous resin mixtures, and graft compounds such as organic polymer grafts onto glass and minerals.
  • Alumina sol includes feather-like particles, granular particles, and the like.
  • Synthetic mica is a silicate mineral represented by KMg 3 AlSi 3 O 10 F 2 , K part is Na, Ca, Sr, Ba, Mg part is Al, Fe 2+ , Ni, Co, Mn, Examples include Li and Zn, in which Al is replaced with Zn, Be, B, Co, Mn, Li, and Zn, and Al is replaced with Zn, Be, B, Co, and Fe.
  • Phosphonyl chlorides include various compounds as polyphosphazene derivatives.
  • Examples of cement include polytranto cement, alumina cement, and the like.
  • the carbon dioxide solid recovery material according to the present embodiment can selectively adsorb and fix carbon dioxide from a gas containing carbon dioxide.
  • the adsorption temperature is about 10° C. to 200° C. between room temperature and exhaust gas outlet temperature. Since additional heating from the outside is not required, the energy cost for adsorption can be kept low (above, carbon dioxide fixation step).
  • the carbon dioxide solid recovery material according to the present embodiment desorbs the carbon dioxide taken in in the above-described carbon dioxide fixing step at a temperature of 50 ° C. to 200 ° C. in a gas atmosphere that does not contain carbon dioxide. is preferably recovered. Since the desorption temperature is as low as 200° C. or lower, the energy cost required for desorption can be kept low (the above is the carbon dioxide recovery step).
  • the solid recovery material for carbon dioxide comprises a step of subjecting a material containing iron oxide and an alkali compound containing sodium to a solid phase reaction, and mixing an organic binder or an inorganic binder with the powder obtained by the solid phase reaction. It is manufactured by going through the steps of smelting and molding.
  • iron oxide and sodium source powder are mixed and pulverized and fired to obtain sodium ferrite particle powder, and then the obtained sodium ferrite particle powder and an organic binder or an inorganic binder are combined.
  • the mixture is kneaded using a kneader such as a double-bowl kneader, screw kneader, Muller mill, plow mixer, planetary motion mixer, etc., and molded using an extruder such as a screw extruder or a roller extruder.
  • a carbon dioxide solid recovery material can be obtained. Baking may be performed by steam heating, microwave heating, ultrasonic heating, or the like, in addition to normal baking.
  • the organic binder for example, a polymeric material selected from polystyrene, polyethylene, polypropylene, nitrile butadiene, silicone, fluororesin, and cellulose can be used.
  • the inorganic binder is, for example, an inorganic material containing one or more of Na, Li, K, Ca, Mg, Si, Al, Ca, Fe and Zn, silicate, metal phosphate, metal Fluid inorganic materials such as alcoholates, organopolysiloxanes, organic-inorganic composite polymers, alumina sol, synthetic mica, phosphonitrile chloride, cement, etc. are kneaded with sodium ferrite, molded into appropriate sizes, and dried by applying thermal energy, etc.
  • the content of the organic binder or inorganic binder is preferably 1% to 50% by weight. This is because, as described above, formation of a compact containing sodium ferrite at a high concentration improves the ability to fix and recover carbon dioxide.
  • Materials containing iron oxide are not particularly limited, but for example, hematite, magnetite, maghemite, and goethite can be used.
  • the compound containing sodium is not particularly limited, but for example, sodium nitrite, sodium hydroxide, sodium oxide, sodium carbonate, etc. can be used. However, when considering industrial use, sodium nitrite, sodium sulfate, etc., which may generate toxic nitrous gas, sulfurous acid gas, etc. during production should be avoided.
  • a solid-phase reaction is a synthesis method in which solids are mixed and elements are moved to react without using a solvent. Since a solvent is not used as the reaction mother liquor, waste such as a solvent when used in a liquid phase reaction can be reduced. In addition, in the case of the solid-phase reaction at low temperature, which is a feature of the present invention, the reaction can be performed at an extremely high concentration, so the energy cost can be kept low. In addition, since the high-concentration reaction and washing are not required, a high yield of the product can be expected.
  • a representative embodiment of the present invention is as follows.
  • the sodium ferrite particle powder of the carbon dioxide solid recovery material according to the present invention and elemental analysis (excluding oxygen) in their raw materials were performed with a scanning fluorescent X-ray analyzer ZSX Primus II manufactured by Rigaku.
  • composition of the inorganic component of the carbon dioxide solid recovery material according to the present invention was determined by pulverizing the carbon dioxide solid recovery material in a mortar and pelletizing it, and then using a fully automatic multi-purpose X-ray diffractometer D8 ADVANCE manufactured by BRUKER. It was identified that ⁇ -sodium ferrite was contained, and when an inorganic binder was used as the binder, it was identified that the inorganic binder was contained.
  • composition of the organic component of the carbon dioxide solid recovery material according to the present invention is obtained by pulverizing the carbon dioxide solid recovery material in a mortar, mixing it with potassium bromide and pelletizing it, and then converting it into a portable FT-IR (Fourier) manufactured by Thermo Scientific. It was identified to be the same as the added organic binder when identified by a conversion infrared spectrophotometer ("Niclet iS5").
  • the content of the sodium ferrite and the organic binder contained in the carbon dioxide solid recovery material according to the present invention can be determined by crushing the carbon dioxide solid recovery material in a mortar and using Hitachi High-Tech The mixture was heated from room temperature to 200° C. using a differential thermogravimetry simultaneous measurement apparatus STA7000 manufactured by Manufacture, and the heat loss portion was used as an organic binder component, and the remaining portion was used as an inorganic sodium ferrite portion.
  • the major axis and minor axis of 80 grains were measured using a vernier caliper, and the average value was taken as the average particle size.
  • the BET specific surface area of the carbon dioxide solid recovery material according to the present invention was measured by the BET method using nitrogen using Multisorb-16 manufactured by QUANTA CHROME.
  • the hardness of the carbon dioxide solid recovery material according to the present invention is the average value of the crushing hardness of 80 grains using Imada's digital force gauge ZP-500N.
  • the hardness of the carbon dioxide solid recovery material according to the present invention was evaluated in the following three stages.
  • the pH value of the carbon dioxide solid recovery material according to the present invention is determined by weighing 5 g of a sample into a 300 ml Erlenmeyer flask, adding 100 ml of boiled pure water, heating and maintaining the boiling state for about 5 minutes, and then plugging the flask. Add water equivalent to the weight loss, plug again, shake and mix for 1 minute, let stand for 5 minutes, then measure the pH of the resulting supernatant liquid according to JIS Z8802-7. The value obtained was taken as the pH value.
  • the Na/Fe molar ratio of the sodium ferrite contained in the carbon dioxide solid recovery material according to the present invention is determined by pulverizing the carbon dioxide solid recovery material in a mortar and pelletizing it, followed by scanning fluorescent X-ray spectrometer manufactured by Rigaku. Elemental analysis (excluding oxygen) was performed with ZSX Primus II and quantified.
  • the axial ratio of the sodium ferrite contained in the carbon dioxide solid recovery material according to the present invention is the average major axis diameter and the average
  • the minor axis diameter was measured and shown as the ratio of the average major axis diameter to the average minor axis diameter (average major axis diameter/average minor axis diameter).
  • the average primary particle size of the sodium ferrite particles contained in the carbon dioxide solid recovery material according to the present invention is shown as the average value of the average major axis diameter and average minor axis diameter.
  • Quantification of primary particles by scanning electron microscopy revealed an average major axis diameter of 0.7 ⁇ m, an average minor axis diameter of 0.4 ⁇ m, an average primary particle diameter of 0.55 ⁇ m, and an axial ratio of 1.8. .
  • the powder pH was relatively high at 13.8. 90 parts by weight of the obtained sodium ferrite particles, 10 parts by weight of polystyrene (weight average molecular weight: 12,000) and 20 parts by weight of methyl ethyl ketone were kneaded in a double bowl kneader.
  • the obtained carbon dioxide solid recovery material had a hardness of 10 kgf/mm 2 and was evaluated as ⁇ . From these results, it is clear that when the carbon dioxide recovery material according to Example 1 is packed in a carbon dioxide adsorption tower or the like, it is difficult to break and gas such as exhaust gas flows easily.
  • the Na/Fe molar ratio of the sodium ferrite contained in the obtained carbon dioxide solid recovery material was 1.0, which was the same as the feed ratio of the raw material.
  • FIG. 1 shows a measurement chart with the sample temperature plotted on the horizontal axis.
  • the TG curve is the weight percent of the remaining sample at each temperature when the initial value was 100 weight percent, and the amount of sample loss was attributed to the release of carbon dioxide.
  • the DTG curve is a differential curve of the TG curve, and the temperature at which the DTG curve takes the maximum value was regarded as the desorption temperature of carbon dioxide.
  • the DTA curve shows a downwardly convex curve, indicating that the endothermic reaction takes place at around 114°C.
  • the desorption temperature of carbon dioxide was 114 ° C.
  • the desorption amount of carbon dioxide was 17% by weight based on the solid content of the sample. It was found that there is recovery performance.
  • Examples 2-9 Carbon dioxide solid recovery materials according to Examples 2 to 9 were obtained in the same manner as in Example 1 except that the types and amounts of the iron raw material, sodium source and organic binder were varied.
  • Table 1 shows the production conditions in these examples
  • Table 2 shows the characteristics of the obtained carbon dioxide solid recovery materials
  • Table 3 shows the effects.
  • Comparative example 1 100 parts by weight of the sodium ferrite particles obtained in Example 1 were granulated with a tumbling granulator at 40 rpm while adding a small amount of 1% carboxymethyl cellulose aqueous solution, and the granules were placed in a crucible and placed in a nitrogen stream at 400°C. for 16 hours. Then, it was cooled to room temperature and used as a carbon dioxide solid recovery material. The resulting carbon dioxide solid recovery material was pulverized and qualitatively determined by X-ray diffraction to find that it was sodium ferrite. Fluorescent X-rays also revealed that the content of sodium ferrite was 100%. The BET specific surface area of this carbon dioxide solid recovery material was 4 m 2 /g. The short axis was 4 mm, the long axis was 9 mm, and the average particle size was 6.5 mm. The powder pH was 10.
  • the obtained carbon dioxide solid recovery material had a hardness of 1 kgf/mm 2 and was evaluated as x. From these results, it is clear that when the carbon dioxide recovery material is packed into a carbon dioxide adsorption tower or the like, it is fragile and irregular in shape due to gravity and friction due to the flow of exhaust gas, etc., making it difficult to fill.
  • Table 1 shows the production conditions of this comparative example
  • Table 2 shows the characteristics of the obtained carbon dioxide solid recovery material
  • Table 3 shows the effects.
  • the carbon dioxide solid recovery material according to the present invention is excellent in carbon dioxide adsorption and recovery.
  • the solid recovery material is obtained by granulating sodium ferrite particles, which are solids having a carbon dioxide recovery capability, into millimeter sizes with an organic binder interposed therebetween.
  • Quantification of primary particles by scanning electron microscopy revealed an average major axis diameter of 0.7 ⁇ m, an average minor axis diameter of 0.4 ⁇ m, an average primary particle diameter of 0.55 ⁇ m, and an axial ratio of 1.8. .
  • the powder pH was relatively high at 13.8. 90 parts by weight of the obtained sodium ferrite particles, 10 parts by weight of sodium silicate and 10 parts by weight of water were kneaded in a double bowl kneader. This was extruded by a roller extruder (opening 1 mm) and rotated by a spheroidizer to obtain cylindrical pellets with a diameter of 1 mm and a length of 3 mm. This was fired in a firing furnace at 200° C.
  • the obtained carbon dioxide solid recovery material was pulverized and qualitatively determined by X-ray diffraction to find that it contained 90% sodium ferrite and 10% sodium silicate.
  • the BET specific surface area of this carbon dioxide solid recovery material was 3 m 2 /g.
  • the short axis was 1 mm
  • the long axis was 3 mm
  • the axial ratio was 3, and the average particle diameter was 2 mm.
  • the powder pH was 13.
  • the obtained carbon dioxide solid recovery material had a hardness of 10 kgf/mm 2 and was evaluated as ⁇ . From these results, it is clear that when the carbon dioxide recovery material according to Example 10 is filled in a carbon dioxide adsorption tower or the like, it is difficult to break and gas such as exhaust gas flows easily.
  • the Na/Fe molar ratio of the sodium ferrite contained in the obtained carbon dioxide solid recovery material was 1.0, which was almost the same as the feed ratio of the raw material.
  • FIG. 2 shows a measurement chart with the sample temperature plotted on the horizontal axis.
  • the TG curve is the weight percent of the remaining sample at each temperature when the initial value was 100 weight percent, and the amount of sample loss was attributed to the release of carbon dioxide.
  • the DTG curve is a differential curve of the TG curve, and the temperature at which the DTG curve takes the maximum value was regarded as the desorption temperature of carbon dioxide.
  • the DTA curve showed a downwardly convex curve, indicating that the endothermic reaction took place at around 108°C.
  • the desorption temperature of carbon dioxide was 108 ° C.
  • the desorption amount of carbon dioxide was 18% by weight based on the solid content of the sample. It was found that there is recovery performance.
  • Examples 11-23 Carbon dioxide solid recovery materials according to Examples 11 to 23 were obtained in the same manner as in Example 10 except that the types and amounts of the iron raw material, sodium source and inorganic binder were varied.
  • Table 4 shows the production conditions in these examples
  • Table 5 shows the characteristics of the obtained carbon dioxide solid recovery materials
  • Table 6 shows the effects.
  • Comparative example 1 As a comparative example, the same one as in Comparative Example 1 was used. Table 4 shows the production conditions of this comparative example, Table 5 shows various characteristics of the obtained carbon dioxide solid recovery material, and Table 6 shows the effect.
  • the carbon dioxide solid recovery material according to the present invention is excellent in adsorption and recovery of carbon dioxide. Further, the solid recovery material is obtained by granulating sodium ferrite particles, which are solids having a carbon dioxide recovery ability, into millimeter sizes via an inorganic binder, and has high hardness, and can be directly filled into a carbon dioxide adsorption tower.

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WO2025134582A1 (ja) * 2023-12-20 2025-06-26 戸田工業株式会社 二酸化炭素の固体回収材
WO2025204100A1 (ja) * 2024-03-29 2025-10-02 戸田工業株式会社 二酸化炭素の固体回収材およびその製造方法

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