WO2016171426A1 - Membrane à fibres creuses d'alumine hydrophobe pour absorption de dioxyde de carbone et procédé pour sa préparation - Google Patents

Membrane à fibres creuses d'alumine hydrophobe pour absorption de dioxyde de carbone et procédé pour sa préparation Download PDF

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WO2016171426A1
WO2016171426A1 PCT/KR2016/003835 KR2016003835W WO2016171426A1 WO 2016171426 A1 WO2016171426 A1 WO 2016171426A1 KR 2016003835 W KR2016003835 W KR 2016003835W WO 2016171426 A1 WO2016171426 A1 WO 2016171426A1
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hollow fiber
fiber membrane
carbon dioxide
alumina hollow
och
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PCT/KR2016/003835
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Korean (ko)
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박정훈
이홍주
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동국대학교 산학협력단
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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
    • B01D53/14—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 absorption
    • 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
    • B01D53/22—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 diffusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D63/00—Apparatus in general for separation processes using semi-permeable membranes
    • B01D63/02—Hollow fibre modules
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
    • B01D69/08—Hollow fibre membranes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • 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

Definitions

  • the present invention relates to a hydrophobic alumina hollow fiber membrane for carbon dioxide absorption and a method for manufacturing the same, and more particularly, to modify the surface of the alumina hollow fiber membrane obtained by the phase transfer method with perfluoroalkylsilane to prepare a hydrophobic alumina hollow fiber membrane, and
  • the present invention relates to a technique applied to a contact device for absorption.
  • the absorption process using a wet amine is a field that can be stably operated and removes carbon dioxide on a large scale and is relatively easy to design, and thus many studies have been conducted.
  • the existing packed tower absorption process has a problem of high energy consumption, entrainment, flooding, channeling, and foaming (Patent Document 1).
  • the hollow fiber contact membrane has a high surface area per unit volume and the module filling rate compared to the technology using a flat plate or tubular separator is known to enable efficient material transfer.
  • the separator used in the contact membrane requires high hydrophobicity, porosity, low mass transfer resistance, and resistance to chemicals used as an absorbent liquid.
  • Non-Patent Document 1 Non-Patent Document 1
  • the present inventors prepared alumina hollow fiber membrane made of a ceramic material by a conventional phase-transfer method, and if the hydroxy group and the perfluorinated alkylsilane compound, which is a coupling agent, react on the surface of the alumina hollow fiber membrane to be hydrophobically modified, the pores of the membrane
  • the present invention has been completed by contemplating that the hydrophobic alumina hollow fiber membrane can be applied to a hollow fiber membrane contact device for absorbing carbon dioxide.
  • Patent Documents 1. Korean Registered Patent No. 10-0661489
  • Patent Document 2 Korea Patent Publication No. 10-2014-0049702
  • Non-Patent Document 1 Sirichai Koonaphapdeelert et al ., Chem. Eng. Sc i., 64 , 1-8 (2009)
  • an object of the present invention is to improve the hydrophobicity and to facilitate the movement of gas through the pores of the membrane and the resulting material transfer, carbon dioxide absorption is remarkably increased as the absorbent flow rate increases It is an object of the present invention to provide a hydrophobic alumina hollow fiber membrane for absorbing carbon dioxide that can be dissolved in an increasing hollow fiber membrane contactor.
  • the present invention for achieving the above object provides a hydrophobic alumina hollow fiber membrane for carbon dioxide absorption comprising a perfluorinated alkylsilane coating layer represented by the following formula.
  • n is an integer of 7 to 10
  • R 1 , R 2 and R 3 -CH 3 , -CH 2 CH 3 , -OCH 3 or -OCH 2 CH 3
  • R 1 to R 3 At least two may be the same or different from each other as —OCH 3 or —OCH 2 CH 3 );
  • the perfluorinated alkylsilane represented by the above formula is characterized in that octal perfluorooctyl ethyl trimethoxysilane (perfluorooctyl ethyl trimethoxysilane).
  • the hydrophobic alumina hollow fiber membrane for carbon dioxide absorption is characterized in that the pore size is 0.28 ⁇ 0.31 ⁇ m, porosity is 49.1 ⁇ 56.1%.
  • the present invention comprises the steps of I) mixing the alumina particles, polymer binder and dispersant with an organic solvent to obtain a dope solution; II) supplying and discharging the dope solution together with an internal coagulant to a double spinning nozzle to form hollow fibers; III) contacting the hollow fiber with an external coagulant to obtain a hollow fiber membrane by washing, drying and sintering while undergoing a phase transition process; And IV) immersing the sintered hollow fiber membrane in a perfluorinated alkylsilane solution represented by the following formula for 2 to 150 hours at room temperature; and providing a method for producing a hydrophobic alumina hollow fiber membrane for absorbing carbon dioxide.
  • n is an integer of 7 to 10
  • R 1 , R 2 and R 3 -CH 3 , -CH 2 CH 3 , -OCH 3 or -OCH 2 CH 3
  • R 1 to R 3 At least two may be the same or different from each other as —OCH 3 or —OCH 2 CH 3 );
  • the polymer binder is characterized in that any one selected from the group consisting of polysulfone, polyethersulfone, polyetherimide, polyamide and polyacrylonitrile.
  • the dispersant is characterized in that the polyvinylpyrrolidone or polyvinyl alcohol.
  • the organic solvent is at least one selected from the group consisting of N-methylpyrrolidone (NMP), dimethylformamide (DMF), dimethylacetamide (DMAc) and dimethyl sulfoxide (DMSO).
  • NMP N-methylpyrrolidone
  • DMF dimethylformamide
  • DMAc dimethylacetamide
  • DMSO dimethyl sulfoxide
  • the content of the alumina particles in the dope solution is characterized in that 50 to 60% by weight.
  • the perfluorinated alkylsilane represented by the above formula is characterized in that octal perfluorooctyl ethyl trimethoxysilane (perfluorooctyl ethyl trimethoxysilane).
  • the perfluoroalkylsilane solution represented by the above formula is characterized in that the concentration is 0.01 mol / L to 0.05 mol / L.
  • the present invention provides a membrane module including the hydrophobic alumina hollow fiber membrane for carbon dioxide absorption.
  • the present invention also provides a hollow fiber membrane contact device including the membrane module.
  • the present invention it is possible to provide a hydrophobic alumina hollow fiber membrane for carbon dioxide absorption in which the amount of carbon dioxide absorption is significantly increased as the flow rate of the absorbent liquid is increased due to the improved hydrophobicity, which facilitates the movement of gases through the pores of the membrane and the subsequent material transfer.
  • the membrane module including the hollow fiber membrane contact device the carbon dioxide absorption can be greatly improved.
  • FIG. 1 is a conceptual view showing that the surface of the alumina hollow fiber membrane is hydrophobically modified by the coupling reaction between the hydroxyl group and the perfluoroalkylsilane on the surface of the alumina hollow fiber membrane according to the present invention.
  • Figure 2 is a sintering process profile of the alumina hollow fiber membrane according to the present invention.
  • Figure 3 is a graph showing the X-ray diffraction characteristics of the alumina particles (a) and the alumina hollow fiber membrane (b) after sintering at 1300 °C according to an embodiment of the present invention.
  • SEM scanning electron microscope
  • FT-IR infrared spectroscopy
  • SEM scanning electron microscope
  • FIG. 7 is a graph showing a change in contact angle over time of modifying (coating) the surface of an alumina hollow fiber membrane sintered from the present invention including an example with a perfluoroalkylsilane (FAS).
  • FAS perfluoroalkylsilane
  • TGA thermogravimetric analysis
  • FAS alkyl fluoride
  • FIG. 9 is a schematic diagram of a hollow fiber membrane contactor to which a membrane module including a hydrophobic alumina hollow fiber membrane for absorbing carbon dioxide prepared from the present invention is applied.
  • the present invention provides a hydrophobic alumina hollow fiber membrane for carbon dioxide absorption comprising a perfluorinated alkylsilane coating layer represented by the following formula.
  • n is an integer of 7 to 10
  • R 1 , R 2 and R 3 -CH 3 , -CH 2 CH 3 , -OCH 3 or -OCH 2 CH 3
  • at least two or more of R 1 to R 3 may be the same as or different from each other as -OCH 3 or -OCH 2 CH 3 )
  • the present invention is a metal oxide material of the hollow fiber membrane to overcome the problem that the porous organic polymer hollow fiber membrane applied to the contact membrane process for absorbing carbon dioxide is deformed due to the swelling phenomenon due to the absorbent liquid and the carbon dioxide absorption rate is drastically reduced.
  • alumina which is a ceramic base.
  • the alumina hollow fiber membrane has hydrophilicity due to the hydroxyl group (-OH) present on the surface, wetting phenomenon occurs when the absorbent fills the pores, and thus, the material transfer through the pores of the membrane is not good, and thus the carbon dioxide absorption rate is also lowered.
  • the FAS is preferably represented by the above formula.
  • n is preferably an integer of 7 to 10, and more preferably n is 7.
  • R 1 , R 2 and R 3 bonded to a silicon atom are preferably at least two or more methoxy groups (-OCH 3 ) or ethoxy groups (-OCH 2 CH 3 ) for smooth coupling reaction with FAS, May be the same or different from each other, and when two of R 1 , R 2 and R 3 are a methoxy group (-OCH 3 ) or an ethoxy group (-OCH 2 CH 3 ), the other is a methyl group (-CH 3 ) or an ethyl group ( -CH 2 CH 3 ) may be used.
  • the perfluoroalkyl silane (FAS) represented by the above formula is more preferably octopyl perfluorooctyl ethyl trimethoxysilane (perfluorooctyl ethyl trimethoxysilane) in consideration of the coupling reactivity on the surface of the alumina and the resulting hydrophobic modification effect, more preferably use.
  • the alumina is preferably the most common alpha-alumina ( ⁇ -Al 2 O 3 ), but gamma-alumina ( ⁇ -Al 2 O 3 ) is known to have a large number of hydroxy groups and a relatively large specific surface area on the surface of the alumina May also be effective when considering pairing reactivity with FAS.
  • the hydrophobic alumina hollow fiber membrane for carbon dioxide absorption according to the present invention has an average pore size of 0.28 to 0.31 ⁇ m, and a porosity of 49.1 to 56.1% is preferred because it can maximize the absorption rate of carbon dioxide.
  • the present invention comprises the steps of I) mixing the alumina particles, polymer binder and dispersant with an organic solvent to obtain a dope solution; II) supplying and discharging the dope solution together with an internal coagulant to a double spinning nozzle to form hollow fibers; III) contacting the hollow fiber with an external coagulant to obtain a hollow fiber membrane by washing, drying and sintering while undergoing a phase transition process; And IV) immersing the sintered hollow fiber membrane in a perfluorinated alkylsilane solution represented by the following formula for 2 to 50 hours at room temperature; and providing a method for producing a hydrophobic alumina hollow fiber membrane for absorbing carbon dioxide.
  • n is an integer of 7 to 10
  • R 1 , R 2 and R 3 -CH 3 , -CH 2 CH 3 , -OCH 3 or -OCH 2 CH 3
  • R 1 to R 3 At least two may be the same or different from each other as —OCH 3 or —OCH 2 CH 3 );
  • the alumina may be alpha-alumina ( ⁇ -Al 2 O 3 ) or gamma-alumina ( ⁇ -Al 2 O 3 ).
  • the polymer binder serves as a binder of the alumina particles, and may be any one selected from the group consisting of polysulfone, polyether sulfone, polyetherimide, polyamide, and polyacrylonitrile, and polyether sulfone Is preferably used.
  • the dispersant is to improve the dispersibility of the alumina particles in the organic solvent, preferably polyvinylpyrrolidone or polyvinyl alcohol, more preferably polyvinylpyrrolidone.
  • the organic solvent is a solvent capable of dissolving the binder, a polar aprotic solvent-based N-methylpyrrolidone (NMP), dimethylformamide (DMF), dimethylacetamide (DMAc) And dimethylsulfoxide (DMSO), any one or more selected from the group consisting of, and N-methylpyrrolidone (NMP) is more preferably used.
  • NMP N-methylpyrrolidone
  • the content of the alumina particles in the dope solution is preferably 50 to 60% by weight in consideration of the dispersibility in the dope solution and the ease of film formation in the process of manufacturing the hollow fiber membrane.
  • the use of water as the internal coagulant and the external coagulant can easily obtain a porous membrane having an asymmetric structure by solvent-non-solvent exchange during the process of hollow fiber formation and phase transition.
  • step III the sintering process of step III) as shown in the profile of Figure 2, proceeds while varying the temperature increase rate and isothermal holding time can be sintered at 1300 °C for 4 hours.
  • the surface of the hollow fiber membrane is modified by immersing the sintered hollow fiber membrane in a perfluorinated alkylsilane solution represented by the chemical formula at room temperature for 2 to 150 hours to coat the surface of the hollow fiber membrane.
  • the perfluoroalkyl silane represented by is more preferably octyl perfluorooctyl ethyl trimethoxysilane.
  • the perfluorinated alkylsilane solution represented by the above formula is a perfluoroalkylsilane compound dissolved in an organic solvent such as n-hexane, the concentration is preferably 0.01 mol / L to 0.05 mol / L, perfluorinated If the concentration of the alkylsilane solution is less than 0.01 mol / L, it is difficult to form a coating layer uniformly. If the concentration of the alkyl fluoride solution exceeds 0.05 mol / L, the coating layer may be thickened, and the absorption rate of carbon dioxide may be lowered. It is also not preferable in terms of economics by using a perfluorinated alkylsilane compound.
  • the present invention provides a membrane module comprising a hydrophobic alumina hollow fiber membrane for carbon dioxide absorption surface-modified with the perfluoroalkyl silane represented by the above formula, by applying to the hollow fiber membrane contact device by using such a membrane module It can greatly improve.
  • the hollow fiber was contacted with water, which is an external coagulant, to perform a normal cleaning and drying process while undergoing a phase transition process.
  • the dried film was sintered at 1300 ° C. according to the sintering conditions shown in FIG. 2 using an electric furnace.
  • the sintered film was cut into 100-200 mm lengths and immersed in an octyl perfluoride ethyl trimethoxysilane solution (dissolved in n-hexane at a concentration of 0.02 mol / L) at room temperature for 2 hours to mate. After washing three times with n-hexane to remove the unreacted compound and drying in an oven at 120 ° C. for 24 hours, an alumina hollow fiber membrane surface-modified (coated) with an alkylperfluoride was prepared.
  • the alumina particles contained about 0.1% of impurities such as Na 2 O, SiO 2 , Fe 2 O 3 , and MgO, but were not detected in the X-ray diffraction peaks.
  • ⁇ -Al 2 O 3 structure is shown.
  • the dope solution was prepared using polymer materials such as N-methylpyrrolidone (NMP), polyethersulfone, polyvinylpyrrolidone for spinning the hollow fiber membrane, but the alumina particles were also sintered at 1300 ° C.
  • FIG. 4 shows a scanning electron microscope (SEM) image of the cross section (a) and the membrane wall (b) of the sintered alumina hollow fiber membrane according to the embodiment of the present invention.
  • SEM scanning electron microscope
  • the polyether sulfone used as a binder has a high deposition rate, thereby forming a finger structure, whereas the precipitated polyether sulfone prevents solvent-non-solvent interchange, thereby slowing down the polyether sulfone precipitation in the hollow fiber membrane intermediate layer.
  • FIG. 5 shows infrared spectroscopy (FT-IR) spectra before (no coating) and after (FAS coating) of modifying the surface of the alumina hollow fiber membrane with perfluoroalkylsilane (FAS) according to an embodiment of the present invention.
  • FT-IR infrared spectroscopy
  • the alumina hollow fiber membrane was washed three times with n-hexane in the step of modifying hydrophobicly, and after the process of drying for 24 hours in an oven at 120 ° C., FAS was uniformly coated on the surface.
  • Figure 6 is a scanning electron microscope (SEM) image of the surface (lumen side and shell side) before and after hydrophobic modification of the sintered alumina hollow fiber membrane according to an embodiment of the present invention
  • SEM scanning electron microscope
  • Fig. 7 is a graph showing a change in contact angle with time of modifying (coating) the surface of the alumina hollow fiber membrane sintered from the present invention including the above embodiment with a perfluoroalkyl silane (FAS).
  • FAS perfluoroalkyl silane
  • the coating time for modifying the surface of hydrophobicly is preferably 2 to 50 hours, more preferably 2 to 20 hours.
  • FIG. 8 shows the results of thermogravimetric analysis (TGA) according to the time of modifying (coating) the surface of the alumina hollow fiber membrane sintered from the present invention including the above embodiment with a perfluoroalkylsilane (FAS).
  • TGA thermogravimetric analysis
  • the surface of the sintered alumina hollow fiber membrane is not coated with FAS has almost no change in weight loss even with increasing temperature, compared to the alumina hollow fiber membrane coated with FAS for 2 hours ( Example) All of the coating time was increased up to 150 hours and showed a sharp weight loss after passing about 250 ° C., so that the organic compound FAS was well coated on the surface of the alumina hollow fiber membrane.
  • the weight loss ratio (%) also increases significantly from 2 to 50 hours of coating time, but after 50 hours, it can be seen that the change is not large, which corresponds to the contact angle measurement result of FIG. 7.
  • the minimum break through pressure was measured in order to repeatedly confirm the hydrophobicity characteristics of the surface-modified alumina hollow fiber membrane with FAS prepared from the embodiment of the present invention, and the minimum penetration pressure of the alumina hollow fiber membrane before coating with FAS was measured.
  • This minimum penetration pressure can be represented by the following equation (1) known as the Young-Laplace equation.
  • Is the pore radius of the separator Is the pore radius of the separator.
  • the surface tension has a fixed value, and as shown in FIG. 6, since the pore structure of the hollow fiber membrane is not affected by the FAS, the pore radius is almost the same. Therefore, only the contact angle represented by ⁇ acts as a variable affecting the minimum penetration pressure. As ⁇ increases in the range 0 ° ⁇ ⁇ 180 ° It can be expected to increase the value of, and indirectly confirm that the contact angle is increased by increasing the minimum penetration pressure.
  • the contact angle was measured only on the outer surface of the membrane, but the minimum penetration pressure result showed that the contact angle of the inner surface also increased, and both of them confirmed that hydrophobic surface modification was successful.
  • the minimum penetration pressure increases, the absorption liquid flows into the membrane, and thus the carbon dioxide absorption can be increased because the operation can be performed without wetting even if the liquid pressure is kept higher than the gas during the carbon dioxide absorption experiment. have.
  • a single membrane module was fabricated using the hollow fiber membrane which confirmed the hydrophobic property by measuring the contact angle and the minimum penetration pressure, and the flow rate of the absorbent liquid (distilled water) was 20 to 50 ml / min with the apparatus (see FIG. 9) including the same.
  • Carbon dioxide absorption experiment was carried out while increasing, the results are shown in FIG. It can be seen that the amount of carbon dioxide absorption increases as the flow rate of the absorbent liquid increases, and when the flow rate is 50 ml / min, an absorption amount of up to 1.34 ⁇ 10 ⁇ 3 mol / m 2 ⁇ s was obtained.
  • the overall mass transfer resistance in the contact membrane is expressed as the sum of the gaseous phase, the liquid phase, and the membrane mass transfer resistance as shown in Equation (2) below.
  • the alumina hollow fiber membrane is surface modified by the perfluoroalkyl silane (FAS) coating to show hydrophobicity, so that the gas flow through the pores of the membrane and the resulting material transfer is easy, and as the absorbent flow rate increases
  • FAS perfluoroalkyl silane

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  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
  • Analytical Chemistry (AREA)
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Abstract

La présente invention concerne une technologie pour la préparation d'une membrane à fibres creuses d'alumine hydrophobe par modification d'une surface d'une membrane à fibres creuses d'alumine, obtenue par un procédé de transition de phase, avec alkyl-silane fluoré (FAS). Selon la présente invention, en modifiant en surface une membrane à fibres creuses d'alumine à travers un revêtement d'alkyl-silane fluoré (FAS) pour permettre à la membrane à fibres creuses d'alumine de présenter un caractère hydrophobe, une membrane à fibres creuses d'alumine hydrophobe pour l'absorption de dioxyde de carbone peut être prévue, laquelle facilite la migration de gaz à travers les pores de la membrane et le transfert de masse en résultant, ce qui permet d'augmenter le débit d'un liquide d'absorption, augmentant ainsi remarquablement la quantité d'absorption de dioxyde de carbone ; et en appliquant un module de membrane comprenant la membrane à fibres creuses d'alumine hydrophobe à un contacteur à membrane creuse, le taux d'absorption de dioxyde de carbone peut être considérablement amélioré.
PCT/KR2016/003835 2015-04-21 2016-04-12 Membrane à fibres creuses d'alumine hydrophobe pour absorption de dioxyde de carbone et procédé pour sa préparation WO2016171426A1 (fr)

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WO2020092273A1 (fr) * 2018-10-30 2020-05-07 Arizona Board Of Regents On Behalf Of Arizona State University Membrane de sorbant améliorée pour capture de dioxyde de carbone et son procédé
US20210370230A1 (en) * 2018-10-30 2021-12-02 Arizona Board Of Regents On Behalf Of Arizona State University Enhanced sorbent membrane for carbon dioxide capture and method for same
WO2020239452A1 (fr) * 2019-05-27 2020-12-03 Unilever N.V. Fibre comprenant un organosilane pour la purification de liquides
CN113766960A (zh) * 2019-05-27 2021-12-07 联合利华知识产权控股有限公司 用于液体净化的包含有机硅烷的纤维

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