WO2006013695A1 - 炭酸ガス吸収材、それを用いた炭酸ガス分離方法、および炭酸ガス分離装置 - Google Patents
炭酸ガス吸収材、それを用いた炭酸ガス分離方法、および炭酸ガス分離装置 Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
- B01J20/0211—Compounds of Ti, Zr, Hf
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/06—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group B01J20/04
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/003—Titanates
- C01G23/006—Alkaline earth titanates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/10—Single element gases other than halogens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/50—Carbon oxides
- B01D2257/504—Carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/76—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by a space-group or by other symmetry indications
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/80—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70
- C01P2002/88—Crystal-structural characteristics defined by measured data other than those specified in group C01P2002/70 by thermal analysis data, e.g. TGA, DTA, DSC
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02C—CAPTURE, STORAGE, SEQUESTRATION OR DISPOSAL OF GREENHOUSE GASES [GHG]
- Y02C20/00—Capture or disposal of greenhouse gases
- Y02C20/40—Capture or disposal of greenhouse gases of CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/151—Reduction of greenhouse gas [GHG] emissions, e.g. CO2
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S502/00—Catalyst, solid sorbent, or support therefor: product or process of making
- Y10S502/525—Perovskite
Definitions
- Carbon dioxide absorber Carbon dioxide separation method using the same, and carbon dioxide separator
- the present invention relates to a carbon dioxide absorbent that can be used repeatedly by absorbing carbon dioxide under a high temperature condition and releasing and regenerating the carbon dioxide absorbed under a predetermined condition.
- the present invention relates to a carbon dioxide separation method using carbon dioxide and a carbon dioxide separation apparatus.
- a multilayer ceramic electronic component such as a multilayer ceramic capacitor is usually obtained by molding a ceramic slurry mainly composed of a dielectric raw material powder such as sodium titanate into a sheet shape, and then obtaining the obtained ceramic green sheet (dielectric). Printed on the body sheet), punched out the necessary parts, and laminated.
- the unnecessary part after punching out the ceramic green sheet may be recovered and reused as a ceramic raw material.
- the dielectric of the dielectric obtained after firing Reuse may be restricted due to the fact that the characteristics may vary and the electrode components printed on the ceramic green sheet may become impurities and adversely affect the characteristics.
- waste of titanate ceramic material mainly composed of barium titanate is generated, and an effective recycling method has been studied.
- lithium silicate has a problem in that the strength of the absorbent material is reduced by stress due to repeated use in which the volume change during absorption and desorption of carbon dioxide gas is large.
- lithium silicate (Li SiO 2) reacts with carbon dioxide as shown in chemical formula (1) below.
- the carbon dioxide gas is absorbed at a high temperature exceeding 500 ° C.
- Patent Document 1 Japanese Patent Laid-Open No. 2000-262890
- the present invention solves the above-described problems, and can absorb carbon dioxide in a temperature range of about 500 ° C or higher, and it has little expansion when carbon dioxide is absorbed and has excellent durability.
- Another object of the present invention is to provide a carbon dioxide absorbent, a carbon dioxide separation method using the same, and a carbon dioxide separator.
- the carbon dioxide gas absorbent of the present invention includes a component substance X, which is at least one of Sr and Ba, and Ti, in a molar ratio (XZTi): 1 It is characterized by having as a main component a complex oxide containing 8 to 2.2.
- the component substance X which is at least one of Sr and Ba, and Ti are mixed at a molar ratio (XZTi): 0.9 to 1.1.
- XZTi molar ratio
- it is characterized in that it is obtained by firing a material whose main crystal structure is a pebskite structure in the presence of at least one of strontium carbonate and barium carbonate.
- the component substance X which is at least one of Sr and Ba, and Ti are mixed in a molar ratio (XZTi): 0.9 to 1.1.
- XZTi molar ratio
- the main component of which is a substance whose main crystal structure is a perovskite structure Is obtained by firing in the presence of at least one of strontium carbonate and barium carbonate.
- a part of the component substance X is substituted with Ca.
- the ratio of Ca to X is 1.0 or less in terms of molar ratio (CaZX).
- the carbon dioxide absorbent of claim 5 comprising the component substance X, which is at least one of Sr and Ba, Ca, and Ti, a substance whose main crystal structure is a perovskite structure, It is obtained by firing in the presence of at least one of calcium carbonate, strontium carbonate and barium carbonate.
- a part of the Ti is substituted with Zr, and the ratio of Zr to Ti is 0.25 or less in terms of molar ratio (ZrZTi).
- the carbon dioxide absorbent of claim 7 is characterized in that an apparent specific surface area is 0.25 m 2 Zg or more.
- the carbon dioxide absorbent of claim 8 is a pellet-like carbon dioxide absorbent, which is formed into a pellet and then fired at 1000 to L at 100 ° C. It is said.
- the carbon dioxide separation method of the present invention includes:
- the carbon dioxide absorbed by the carbon dioxide absorbent is
- a carbon dioxide absorption mechanism that makes carbon dioxide absorb the carbon dioxide by contacting with an air stream containing carbon dioxide under the conditions of A carbon dioxide absorbent that absorbs carbon dioxide in contact with an air stream containing carbon dioxide, pressure: under reduced pressure below lOOOPa,
- a carbon dioxide release mechanism that releases carbon dioxide by heating under the conditions of
- the carbon dioxide absorbent of the present invention (Claim 1) is composed of a component substance X, which is at least one of Sr and Ba, and Ti, in a molar ratio (XZTi): 1. 8 to 2.2.
- the main component is a composite oxide containing, and specific substances are represented by the general formula: Ba TiO and the general formula: Sr TiO.
- the carbon dioxide absorbent of the present invention may contain impurities such as Mg, Si, Mn, Na and Ni as impurities, and may further contain rare earth such as Dy as impurities.
- the carbon dioxide absorbent (for example, Ba TiO 3) of the present invention is, for example, a barium titanate.
- BaTiO 3 is calcined in the presence of barium carbonate (BaCO 3) and is expressed by the following chemical formula (2).
- the substance represented by Ba TiO has the reaction of the following chemical formula (3) under specific conditions.
- the carbon dioxide absorbing material of the present invention absorbs and releases carbon dioxide using the reactions of the chemical formulas (3) and (4).
- the carbon dioxide absorbent of the present invention absorbs carbon dioxide at a high temperature of 500 to 900 ° C, particularly in the range of pressure: 1. OX 10 4 to 1. OX 10 6 Pa, particularly near normal pressure. Have the ability to
- the carbon dioxide absorbing material of the present invention that has absorbed carbon dioxide releases carbon dioxide under the conditions of pressure: lOOOPa or lower, temperature: 750 ° C or higher, and is regenerated into Ba TiO Sr TiO, etc.
- the carbon dioxide gas absorbent according to claim 2 contains component substance X, which is at least one of Sr and Ba, and Ti in a molar ratio (XZTi): 0.9 to 1.1. Obtained by calcining a substance whose main crystal structure is a perovskite structure in the presence of at least one of strontium carbonate and barium carbonate, and by the reaction represented by the above chemical formula (2). It is a material that is easily and reliably manufactured. Therefore, it is possible to economically provide a substance having the effect exhibited by the carbon dioxide gas absorbing material according to the invention of claim 1.
- component substance X which is at least one of Sr and Ba
- Ti in a molar ratio (XZTi): 0.9 to 1.1. Obtained by calcining a substance whose main crystal structure is a perovskite structure in the presence of at least one of strontium carbonate and barium carbonate, and by the reaction represented by the above chemical formula (2). It is a material that is easily and reliably manufactured
- the carbon dioxide gas absorbent of the present invention is a molar ratio (XZTi): 0.9 to the component substance X, which is at least one of Sr and Ba, and Ti.
- X which is at least one of Sr and Ba
- Green sheets, green sheet waste materials, green sheet laminate waste materials, and green sheets used in the manufacturing process of electronic components which are mainly composed of substances whose main crystal structure is the velovskite structure. At least one of the precursors can be obtained by calcination in the presence of at least one of strontium carbonate and barium carbonate.
- a substance containing the component substance X which is at least one of Sr and Ba, and Ti in a molar ratio (XZTi): 0.9 to 1.1, and the main crystal structure of which is a perovskite structure (Eg, BaTi 2 O 3) is at least one of strontium carbonate and barium carbonate (BaCO 3) as described above.
- It may contain impurities such as Mg, Si, Mn, Na, and Ni, and it may contain rare earth such as Dy as impurities.
- the green sheet is composed mainly of, for example, BaTiO, and a binder or the like.
- the added slurry is formed into a sheet, and is used as a raw material for manufacturing the carbon dioxide absorbent of the present invention when it is manufactured for the manufacture of electronic components but is no longer needed. can do.
- the green sheet waste material is an unnecessary sheet after a necessary portion is taken out from the green sheet, and these are preferably used as a raw material for producing the carbon dioxide absorbent of the present invention. be able to.
- the green sheet laminate waste material is, for example, an unfired laminate waste material obtained by laminating and pressing the green sheet printed with the electrode material, and these also absorb carbon dioxide gas of the present invention. It can utilize suitably as a raw material at the time of manufacturing a material.
- the green sheet precursor is, for example, a method in which BaTiO is separated into a dispersant together with a binder.
- Such as dispersed ceramic slurry or BaTiO prepared for dispersion in a dispersant Such as dispersed ceramic slurry or BaTiO prepared for dispersion in a dispersant.
- a part of the component substance X is also replaced with Ca.
- the ratio of Ca to X is 1.0 or less in terms of molar ratio (CaZX), it can be effectively used as a carbon dioxide absorbent. In other words, up to 1Z2 (molar ratio) of X can be substituted with Ca.
- the ratio of Ca to X exceeds 1.0 in terms of molar ratio (CaZX) because the ratio of Ca Ti 2 O having substantially no carbon dioxide absorption performance increases.
- the value of the component substance X in the case where X is partially substituted with Ca means X before being substituted with Ca.
- the molar ratio (XZTi) between component substance X and Ti is considered to be 1.8 to 2.2.
- a substance containing at least one of the constituent substances X, Ca, and Ti, the main crystal structure of which is a perovskite structure, is Sr and Ba.
- a portion of X is replaced by Ca, and the ratio of Ca to X is the mole ratio (CaZX) Therefore, it is possible to obtain a substance effective as a carbon dioxide absorbing material that is 1.0 or less.
- the ratio of Zr to Ti exceeds 0.25 in terms of molar ratio (ZrZTi)
- the ratio of Ba ZrO which has a high carbon dioxide gas release temperature, is not preferable.
- an apparent specific surface area should be 0.25 m 2 / g or more. In this case, it is possible to obtain a high carbon dioxide absorption rate, and to suppress the occurrence of cracks due to volume expansion and contraction when the absorption and release of carbon dioxide gas are repeated. It becomes possible to improve.
- the porosity when the apparent specific surface area is 0.25 m 2 / g is about 20%. Considering that the shape of the material is irregular, it is possible to provide a carbon dioxide gas absorbent with stable characteristics by measuring with an apparent specific surface area rather than porosity. 3 ⁇ 4 "Oh.
- the carbon dioxide absorption performance can be further improved.
- the carbon dioxide absorbent of the present invention is more stable in terms of heat compared to, for example, a lithium silicate-based carbon dioxide absorbent, but the absorptance changes depending on the sintered state. There is a case.
- the carbon dioxide separation method of the present invention uses the carbon dioxide absorbent according to any one of Claims 1 to 8, and pressure: 1. OX 10 4 to l. OX 10 6 Pa, temperature: the process of absorbing carbon dioxide under the condition of 500-900 ° C, and the carbon dioxide absorbed by the carbon dioxide absorbent, pressure: lOOOPa or less, temperature: 750 ° C or more This process is used to efficiently absorb carbon dioxide at high temperatures and release the absorbed carbon dioxide (regeneration of carbon dioxide absorbent). This makes it possible to separate carbon dioxide gas at high temperatures economically and efficiently.
- carbon dioxide is released (desorbed) under a reduced pressure of a pressure of lOOOPa or less, so that a high concentration of carbon dioxide can be recovered.
- the carbon dioxide separator according to the present invention uses the carbon dioxide absorbent according to any one of Claims 1 to 8 at a pressure of 1.0 x 10 4 to 1.0 x. 10 6 Pa, temperature: 500-900 ° C Under the conditions, a carbon dioxide absorption mechanism that allows carbon dioxide gas to be absorbed by the carbon dioxide absorber by contacting with a gas stream containing carbon dioxide, and a carbon dioxide absorber that absorbs carbon dioxide by contacting the gas stream containing carbon dioxide.
- FIG. 1 is a diagram showing the results of examining the crystal phase of a carbon dioxide absorbent material according to an example (Example 1) of the present invention by X-ray diffraction analysis.
- FIG. 2 is a diagram showing a test apparatus used for examining the carbon dioxide absorption performance (reaction rate with carbon dioxide) for the carbon dioxide absorbent used in the example of the present invention (Example 1). .
- FIG. 3 is a graph showing the relationship between the carbon dioxide absorption performance (reaction rate with carbon dioxide) and the temperature investigated for the carbon dioxide absorbent that works on the example of the present invention (Example 1).
- FIG. 4 is a view showing a test apparatus used for investigating carbon dioxide gas release performance (carbon dioxide gas release rate) for a carbon dioxide gas absorbent material according to an example (Example 1) of the present invention.
- FIG. 5 is a graph showing the relationship between the carbon dioxide release performance (carbon dioxide release rate) and the temperature investigated for the carbon dioxide absorbent that works on the example of the present invention (Example 1).
- FIG. 6 shows the results of TG-DTA analysis performed on the first carbon dioxide absorbent of Example 1.
- FIG. 7 is a diagram showing a schematic configuration of a carbon dioxide gas separating apparatus which is related to an embodiment (Example 3) of the present invention.
- FIG. 6 is a diagram showing a chart of TG-DTA analysis of samples Nos. 12, 13, and 14 fired with C.
- FIG. 9 The relationship between the specific surface area and the maximum amount of carbon dioxide absorbed in the carbon dioxide absorbent obtained in Example 4, and the carbon dioxide absorbent obtained in Example 5
- FIG. 6 is a diagram showing the relationship between the specific surface area and the maximum absorption amount of carbon dioxide gas examined. Explanation of symbols
- the obtained powder was fired at 1200 ° C for 2 hours to obtain a carbon dioxide gas absorbent (ceramic powder) mainly composed of BaTiO.
- Ba (Ti) is a substance containing Ba and Ti in a molar ratio (BaZ Ti): 0.99 to: L 01, and the main crystal structure is a perovskite structure (BaTiO). Unnecessary parts after removing necessary parts from the green sheet
- Green sheet is degreased at 500 ° C and ceramic powder with BaTiO content of 87%
- This ceramic powder mainly contains Ca, Zr, Si, and Na oxides in the balance.
- BaCO was added to the ceramic powder in an amount such that the molar ratio of BaTiO and BaCO was lZl, and water was further added. The mixture was mixed for 2 hours in a ball mill.
- this carbon dioxide absorber is composed of Ba TiO monoclinic crystal and Ba TiO orthorhombic crystal.
- the first carbon dioxide absorbent and the second carbon dioxide absorbent prepared as described above were examined for carbon dioxide absorption performance using a test apparatus as shown in FIG. 2, and carbon dioxide was absorbed.
- the carbon dioxide gas release characteristics of the later carbon dioxide gas absorbent were investigated.
- the test apparatus of FIG. 2 uses a tube furnace, and is composed of carbon dioxide (CO) and nitrogen gas (N
- the temperature can be controlled in the range from room temperature to 1300 ° C.
- both the first carbon dioxide absorbent and the second carbon dioxide absorbent absorb carbon dioxide at about 500 ° C, with an absorption peak around 700 ° C. Yes, it was confirmed to show superior adsorption performance up to around 900 ° C [0050] From this result, it is certain that the first and second carbon dioxide absorbents exhibit carbon dioxide absorbent performance in the range of 500 to 900 ° C, that is, can be used as carbon dioxide absorbents. i3 ⁇ 4.
- the carbon dioxide absorbent 3 is disposed in the center of the gas absorption pipe 1, and a mixed gas of carbon dioxide and nitrogen gas is heated every minute while the inside of the gas absorption pipe 1 is heated to a predetermined temperature by the heater 2.
- a mixed gas of carbon dioxide and nitrogen gas is heated every minute while the inside of the gas absorption pipe 1 is heated to a predetermined temperature by the heater 2.
- the carbon dioxide gas release rate (reaction rate) in FIG. 5 is obtained based on the above equation (a), and the carbon dioxide absorption reaction rate obtained in equation (a) is 1.
- the release rate (reaction rate) in Fig. 5 becomes 0 and absorbed!
- the release rate (reaction rate) is -1.0.
- both the first and second carbon dioxide absorbents have the same tendency with respect to the release of carbon dioxide, and carbon dioxide is efficiently used at a temperature of 750 ° C or higher. It was confirmed that it could be released well.
- the carbon dioxide release characteristics were examined at a pressure of lOOPa.
- carbon dioxide can be released efficiently by releasing (desorbing) carbon dioxide under a reduced pressure of less than lOOOPa.
- Example 1 carbon dioxide is used as a raw material from BaTiO powder and unnecessary green sheets.
- the green sheet itself in a state of being treated, or a green sheet coated with a conductive paste, a green sheet precursor (for example, a cell in which BaTiO is dispersed in a dispersant together with a binder).
- a green sheet precursor for example, a cell in which BaTiO is dispersed in a dispersant together with a binder.
- 3 3 3 3 3 3 3 3 3 3 3 3 3 3 3 was blended in the proportions (molar ratio) as shown in Table 1 and mixed for 2 hours with a ball mill.
- the first carbon dioxide absorbent of Example 1 that is, the molar ratio of BaTiO and BaCO is 1 with respect to BaTiO powder.
- thermogravimetric analysis differential thermal analysis
- FIG. 6 shows the results of TG-DTA analysis performed on the first carbon dioxide absorbent of Example 1 above.
- the volume ratio of CO and N in the atmospheric gas is CO: 20 and N: 80.
- Example 1 The weight of the first carbon dioxide absorbent in Example 1 above (Sample A in Tables 1 and 2) increased by absorption of carbon dioxide from 618 ° C, and when it reached 1021 ° C or higher, Release reduces weight and returns to original weight.
- the maximum value of TG indicates the maximum absorption amount of carbon dioxide gas. Therefore, in the case of a substance that can be effectively used as a carbon dioxide gas absorbent by this method, the weight change due to the absorption and release of carbon dioxide gas. Can be confirmed.
- Table 2 shows a composite oxide produced by the method of Example 2 (sample Nos. 1 to 10) and the first carbon dioxide absorbent (Example 1) of Example 1 by TG-DTA analysis.
- the carbon dioxide absorption start temperature, the carbon dioxide release start temperature, and the maximum carbon dioxide absorption (TG maximum value) investigated for sample A) in Table 2 are shown.
- the carbon dioxide gas release requires treatment at a high temperature of 900 ° C or higher, but the carbon dioxide gas release temperature can be reduced by reducing the pressure of the reaction system. Can be reduced.
- BaTiO powder, SrTiO powder, and CaTiO powder are used as raw materials.
- BaTiO, SrTiO, CaTiO, etc. are used as a raw material, and a binder is used as the raw material.
- impurities such as Mg, Si, Mn, Na, and Ni and rare earth such as Dy are included as impurities, but it is confirmed that the same effects as in the case of each sample in Table 2 can be obtained. Has been.
- Fig. 7 is a diagram showing a schematic configuration of a carbon dioxide gas separating apparatus according to an embodiment of the present invention.
- This carbon dioxide separator absorbs and separates carbon dioxide in combustion exhaust gas (carbon dioxide-containing gas) with the carbon dioxide absorbent according to the present invention, and then absorbs the carbon dioxide.
- a carbon dioxide separator that releases and recovers the exhaust gas, and includes a switching valve 10 that switches the flow of combustion exhaust gas, and two mechanisms A and B that function as a carbon dioxide absorption mechanism and a carbon dioxide release mechanism. ing.
- FIG. 7 shows a state in which the switching valve 10 is set so that carbon dioxide-containing gas (raw material gas) is supplied to the left-hand mechanism part A, and the left-hand mechanism part A is shown. Shows a state in which the right side functions as a carbon dioxide absorbing mechanism, and the right mechanism B functions as a carbon dioxide releasing mechanism that releases carbon dioxide.
- Each mechanism part A and B includes a container 11, a heater 12, and a carbon dioxide gas absorbent (first carbon dioxide absorbent of Example 1) 3 according to the present invention filled in the container 11. It has.
- Acid gas absorption mechanism part A absorbs carbon dioxide gas.
- the outlet side force of the container 11 is also sucked in vacuum, the pressure is reduced to a pressure of lOOOPa or less (for example, lOOPa), and the carbonic acid in the container 11 is heated by the heater 12.
- lOOOPa a pressure of lOOOPa or less
- the carbonic acid in the container 11 is heated by the heater 12.
- carbon dioxide release reaction of carbon dioxide absorbent that has absorbed carbon dioxide is expressed by the following chemical formula (4).
- the changeover valve is configured so that combustion exhaust gas is supplied to the right mechanism section B. 10 is switched, combustion exhaust gas is supplied to mechanism B, and carbon dioxide is absorbed by carbon dioxide absorbent 3 filled in mechanism B (carbon dioxide absorption mechanism) B.
- mechanism part A vacuum suction is performed from the outlet side of container 11, the pressure is reduced to a reduced pressure state (for example, lOOPa) of lOOOPa or less, and carbon dioxide gas that has absorbed carbon dioxide in container 11 by heater 12 is used.
- the absorbent 3 is heated to 850 ° C. to release carbon dioxide from the carbon dioxide absorbent 3, and the released carbon dioxide is recovered and the carbon dioxide absorbent 3 that has absorbed carbon dioxide is regenerated.
- each mechanism part A and B force is switched by providing a switching valve. This can be done easily.
- Example 3 the charcoal required to absorb lmol of carbon dioxide (CO).
- the weight of the acid gas absorbent was 386 g and the volume was 83 mL.
- the first carbon dioxide absorbent of Example 1 is 20 vol% under the conditions of pressure: normal pressure and temperature: about 700 ° C.
- Carbon dioxide gas is absorbed by the carbon dioxide absorber by contacting with the combustion exhaust gas, and the carbon dioxide absorber that has absorbed the carbon dioxide gas is heated at a predetermined temperature (850 ° C) under reduced pressure (lOOPa), Since carbon dioxide gas is released, the carbon dioxide absorption mechanism section reliably absorbs carbon dioxide gas at high temperatures, and the carbon dioxide release mechanism section releases the absorbed carbon dioxide gas (carbon dioxide absorber).
- the carbon dioxide gas can be separated and recovered at high temperature economically, stably and efficiently.
- Example 3 the mechanism part A and the mechanism part B are installed in parallel, the flow of combustion exhaust gas is switched by the switching valve 10, and the mechanism part A and the mechanism part B alternately turn into a carbon dioxide absorption mechanism.
- the carbon dioxide gas release mechanism and the carbon dioxide gas release mechanism are configured as dedicated mechanisms with different structures.
- the absorption mechanism can be configured to absorb only carbon dioxide, and the carbon dioxide release mechanism can be configured to only release carbon dioxide. In that case, it is necessary to refill the carbon dioxide absorbent as appropriate.
- the amount of BaCO added to the BaTiO and BaCO molar ratio is lZl.
- the mixture obtained as described above was dried at 120 ° C. for 10 hours, Granulation was performed to obtain a spherical granule having a particle diameter of 2 to 5 mm.
- the spherical granulated material is degreased at 500 ° C. for 2 hours, and then calcined at a predetermined temperature in the range of 1000 to 1200 ° C. for 2 hours, and a carbon dioxide gas absorbent containing Ba TiO as a main component.
- the obtained carbon dioxide absorbing material was examined for the non-surface area, the maximum amount of carbon dioxide absorbed, and the occurrence of cracks after carbon dioxide absorption.
- the maximum absorption of carbon dioxide is the maximum value of TG in TG-DTA analysis, measured under the conditions of a temperature increase of 10 ° CZmin and a CO concentration of 20%.
- the crack state after carbon dioxide absorption is the result of observing the sample after carbon dioxide absorption with a microscope (500 times).
- FIG. 4 is a diagram showing a chart of TG-DTA analysis of samples Nos. 12, 13, and 14 fired with C.
- Unnecessary part (unnecessary green sheet) after removing necessary part from green sheet mainly composed of 3 was degreased at 500 ° C to produce ceramic powder with 87% BaTiO content
- This ceramic powder contains mainly oxides of Ca, Zr, Si and Na in the balance.
- the mixture was mixed for 2 hours in a ball mill. Then, the mixture obtained as described above was dried at 120 ° C. for 10 hours, and then granulated with a binder, to obtain spherical granules having a particle diameter of 2 to 5 mm.
- the obtained granulated material is degreased at 500 ° C. for 2 hours, and then calcined at a predetermined temperature in the range of 1000 to 1200 ° C. for 2 hours to obtain a carbon dioxide absorbent mainly composed of Ba TiO. Obtained. [0090] Then, the obtained carbon dioxide absorbent was examined for the non-surface area, the maximum amount of carbon dioxide absorbed, and the occurrence of cracks after carbon dioxide absorption.
- the amount of charge in the sheath in Table 4 indicates the amount of charge of the granule to the heat treatment sheath used at the time of firing.
- Example 4 As shown in Table 4, as in Example 4, when the firing temperature was 1150 ° C or higher (Sample Nos. 24, 25 and 29), the specific surface area decreased and the maximum absorption of carbon dioxide gas was observed. It was confirmed that the amount decreased.
- the obtained carbon dioxide absorbent ie, sample numbers 21, 22, 23, Samples 26, 27, and 28 (carbon dioxide absorber) have a large specific surface area and maximum absorption of carbon dioxide, and no cracks are observed after carbon dioxide absorption. It is important to have a special characteristic.
- FIG. 9 shows the relationship between the specific surface area and the maximum amount of carbon dioxide absorbed in the carbon dioxide absorbent obtained in Example 4 above, and the carbon dioxide absorbent obtained in Example 5 above.
- FIG. 5 is a graph showing the relationship between the specific surface area and the maximum carbon dioxide absorption amount investigated.
- any of the carbon dioxide absorbents of Examples 4 and 5 when the specific surface area was less than 0.25 m 2 / g, the maximum absorption rate of carbon dioxide gas was reduced, and the specific surface area was 0.25 mVg or more. I want to do it.
- a carbon dioxide gas absorbent (Ba TiO 2) having an average particle diameter of 2 mm, which corresponds to the first carbon dioxide absorbent of Example 1 above.
- the nitrogen gas inlet temperature was controlled to 750 ° C.
- a gas containing sulfur dioxide in the proportion of lOOppm in carbon dioxide is circulated at a rate of INLZh (the concentration of carbon dioxide is 5 mol%) to absorb carbon dioxide. Went.
- concentration of sulfur dioxide and sulfur in the resulting gas was Oppm.
- the carbon dioxide gas was absorbed by supplying a carbon dioxide gas containing sulfur dioxide at a rate of lOOppm in the same manner as in Example 6. During the carbon dioxide absorption operation, the sulfur dioxide concentration in the gas discharged from the carbon dioxide absorber became Oppm.
- a carbon dioxide gas absorbent (Ba TiO 2) having an average particle diameter of 2 mm, which corresponds to the first carbon dioxide absorbent of Example 1 above.
- the nitrogen gas inlet temperature was controlled to 750 ° C.
- the present invention is not limited to the above-described embodiments.
- the ratio of component substances X and Ti, which are at least one of Sr and Ba, contained in the carbon dioxide absorbent, and the carbon dioxide absorption conditions can be made within the scope of the invention regarding the release conditions, the specific configuration of the carbon dioxide absorption mechanism and carbon dioxide release mechanism constituting the carbon dioxide separator, etc. It is.
- the carbon dioxide absorbent of the present invention comprises component substance X, which is at least one of Sr and Ba, and Ti. , Molar ratio (XZTi): 1.
- the main component is a composite oxide containing a ratio of 8 to 2.2. It absorbs and absorbs carbon dioxide in a temperature range of about 500 ° C or higher.
- the carbon dioxide gas can be efficiently released under conditions of pressure: 1000 Pa or lower and temperature: 750 ° C. or higher. Therefore, by using this carbon dioxide absorbent, absorption and separation and recovery of carbon dioxide are performed, so that separation and recovery of carbon dioxide at high temperatures can be performed economically and efficiently.
- carbon dioxide gas can be recovered (desorbed) at a reduced pressure of less than lOOOPa.
- a substance in which a part of X constituting the carbon dioxide absorbing material is replaced by Ca within a predetermined range is also effective as a carbon dioxide absorbing material.
- the present invention provides carbon dioxide from gases containing carbon dioxide generated in various fields, such as removal of carbon dioxide from combustion exhaust gas generated in factories and removal of carbon dioxide from exhaust gas from automobile engines. It can be widely applied to gas separation.
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Priority Applications (3)
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JP2006531333A JP3938212B2 (ja) | 2004-08-03 | 2005-07-05 | 炭酸ガス吸収材、それを用いた炭酸ガス分離方法、および炭酸ガス分離装置 |
EP05765471A EP1852179A4 (en) | 2004-08-03 | 2005-07-05 | CARBON DIOXIDE ABSORBENT MATERIAL AND METHOD AND DEVICE FOR SEPARATING CARBON DIOXIDE |
US11/670,552 US7670410B2 (en) | 2004-08-03 | 2007-02-02 | Carbon-dioxide-gas absorber, method for separating carbon-dioxide-gas using carbon-dioxide-gas absorber, and apparatus for separating carbon-dioxide-gas including carbon-dioxide-gas absorber |
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US11/670,552 Continuation US7670410B2 (en) | 2004-08-03 | 2007-02-02 | Carbon-dioxide-gas absorber, method for separating carbon-dioxide-gas using carbon-dioxide-gas absorber, and apparatus for separating carbon-dioxide-gas including carbon-dioxide-gas absorber |
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JP2008074630A (ja) * | 2006-09-19 | 2008-04-03 | Matsushita Electric Ind Co Ltd | ペロブスカイト化合物粉末の製造方法およびこのペロブスカイト化合物粉末を用いたセラミック電子部品 |
WO2008038484A1 (en) * | 2006-09-28 | 2008-04-03 | Murata Manufacturing Co., Ltd. | Method of separating/recovering carbon dioxide |
JP2008208148A (ja) * | 2007-02-23 | 2008-09-11 | Iwatani Internatl Corp | 高一酸化炭素濃度合成ガスの製造方法及び製造装置 |
JP2009119337A (ja) * | 2007-11-13 | 2009-06-04 | Murata Mfg Co Ltd | 炭酸ガスの吸収・放出方法 |
JP2009172479A (ja) * | 2008-01-22 | 2009-08-06 | Fujitsu Ltd | 二酸化炭素除去装置および二酸化炭素の除去方法 |
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JP2018162176A (ja) * | 2017-03-24 | 2018-10-18 | Dowaエレクトロニクス株式会社 | ペロブスカイト型複合酸化物粉末およびその製造方法 |
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US8137435B2 (en) * | 2009-03-31 | 2012-03-20 | L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Procedes Georges Claude | Carbon dioxide recovery from low concentration sources |
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Cited By (11)
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US7621980B2 (en) | 2006-02-28 | 2009-11-24 | Murata Manufacturing Co., Ltd. | Carbon dioxide absorbent and carbon dioxide absorption method using the same |
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JP2008074630A (ja) * | 2006-09-19 | 2008-04-03 | Matsushita Electric Ind Co Ltd | ペロブスカイト化合物粉末の製造方法およびこのペロブスカイト化合物粉末を用いたセラミック電子部品 |
WO2008038484A1 (en) * | 2006-09-28 | 2008-04-03 | Murata Manufacturing Co., Ltd. | Method of separating/recovering carbon dioxide |
JPWO2008038484A1 (ja) * | 2006-09-28 | 2010-01-28 | 株式会社村田製作所 | 二酸化炭素の分離回収方法 |
JP2008208148A (ja) * | 2007-02-23 | 2008-09-11 | Iwatani Internatl Corp | 高一酸化炭素濃度合成ガスの製造方法及び製造装置 |
JP2009119337A (ja) * | 2007-11-13 | 2009-06-04 | Murata Mfg Co Ltd | 炭酸ガスの吸収・放出方法 |
JP2009172479A (ja) * | 2008-01-22 | 2009-08-06 | Fujitsu Ltd | 二酸化炭素除去装置および二酸化炭素の除去方法 |
KR101770701B1 (ko) * | 2012-12-21 | 2017-09-06 | 삼성전자주식회사 | 티탄산 바륨을 포함한 이산화탄소 흡착제, 이를 포함한 이산화탄소 포집 모듈, 및 이를 이용한 이산화탄소 분리 방법 |
JP2018162176A (ja) * | 2017-03-24 | 2018-10-18 | Dowaエレクトロニクス株式会社 | ペロブスカイト型複合酸化物粉末およびその製造方法 |
Also Published As
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EP1852179A1 (en) | 2007-11-07 |
JPWO2006013695A1 (ja) | 2008-05-01 |
JP3938212B2 (ja) | 2007-06-27 |
US20070125229A1 (en) | 2007-06-07 |
US7670410B2 (en) | 2010-03-02 |
EP1852179A4 (en) | 2008-05-28 |
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