WO2022190612A1 - 分離膜及びその製造方法 - Google Patents
分離膜及びその製造方法 Download PDFInfo
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- WO2022190612A1 WO2022190612A1 PCT/JP2022/000730 JP2022000730W WO2022190612A1 WO 2022190612 A1 WO2022190612 A1 WO 2022190612A1 JP 2022000730 W JP2022000730 W JP 2022000730W WO 2022190612 A1 WO2022190612 A1 WO 2022190612A1
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- WIPO (PCT)
- Prior art keywords
- separation
- intermediate layer
- separation membrane
- porous support
- resin composition
- Prior art date
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- B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
- B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/12—Specific ratios of components used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/04—Characteristic thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/36—Hydrophilic membranes
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- 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
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
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- 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
- B01D71/06—Organic material
- B01D71/54—Polyureas; Polyurethanes
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- 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
- B01D71/06—Organic material
- B01D71/58—Other polymers having nitrogen in the main chain, with or without oxygen or carbon only
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- 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
- B01D71/06—Organic material
- B01D71/76—Macromolecular material not specifically provided for in a single one of groups B01D71/08 - B01D71/74
- B01D71/80—Block polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/732—Dimensional properties
- B32B2307/737—Dimensions, e.g. volume or area
- B32B2307/7375—Linear, e.g. length, distance or width
- B32B2307/7376—Thickness
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/748—Releasability
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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
Definitions
- the present invention relates to a separation membrane and its manufacturing method.
- a membrane separation method has been developed as a method for separating acidic gases from mixed gases containing acidic gases such as carbon dioxide.
- the membrane separation method can efficiently separate the acid gas while suppressing the operating cost, compared to the absorption method in which the acid gas contained in the mixed gas is absorbed by an absorbent and separated.
- Separation membranes used in the membrane separation method include composite membranes in which a separation functional layer is formed on a porous support.
- an intermediate layer is sometimes arranged between the separation functional layer and the porous support in order to reduce the film thickness of the separation functional layer (for example, Patent Documents 1 and 2).
- the present invention provides a separation membrane suitable for suppressing variations in separation performance.
- the intermediate layer can be produced, for example, by applying a solution containing the material for the intermediate layer onto the porous support and drying the resulting coating film.
- a solution containing the material for the intermediate layer onto the porous support and drying the resulting coating film.
- the solution tends to penetrate into the inside of the porous support.
- the solution soaks into the porous support, not only does the thickness of the intermediate layer vary, but defects may occur in the formed intermediate layer.
- the present inventors have newly found that the separation performance of the separation membrane varies when a separation functional layer is further formed on the intermediate layer formed by the above method, and have completed the present invention. rice field.
- the present invention a separation functional layer; a porous support supporting the separation functional layer; an intermediate layer disposed between the separation function layer and the porous support and formed from an emulsion resin composition; to provide a separation membrane.
- the present invention A method for producing a separation membrane comprising a separation functional layer, a porous support supporting the separation functional layer, and an intermediate layer disposed between the separation functional layer and the porous support There is The manufacturing method is applying an emulsion resin composition on the porous support to form a coating film; drying the coating film to form the intermediate layer;
- a method for manufacturing a separation membrane comprising:
- the present invention a separation functional layer; a porous support supporting the separation functional layer; an intermediate layer disposed between the separation function layer and the porous support and containing a silicone-based polymer and a hydrophilic polymer; A separation membrane is provided.
- a separation membrane suitable for suppressing variations in separation performance can be provided.
- FIG. 1 is a cross-sectional view schematically showing a separation membrane according to one embodiment of the present invention
- FIG. 1 is a schematic cross-sectional view of a membrane separation device equipped with the separation membrane of the present invention
- FIG. 3 is a perspective view schematically showing a modification of the membrane separation device provided with the separation membrane of the present invention.
- 4 is an electron microscope image of the surface of the intermediate layer in the separation membrane of Comparative Example 1 before forming the separation functional layer. 4 is an image showing a state after a staining solution is applied onto the separation functional layer of the separation membrane of Comparative Example 1.
- the separation membrane 10 of this embodiment comprises a separation functional layer 1, an intermediate layer 2 and a porous support 3.
- the intermediate layer 2 is arranged between the separation functional layer 1 and the porous support 3 and is in direct contact with the separation functional layer 1 and the porous support 3 respectively.
- the intermediate layer 2 is made of an emulsion resin composition.
- the separation functional layer 1 is, for example, a layer that preferentially allows the acidic gas contained in the mixed gas to permeate.
- the separation functional layer 1 contains a resin.
- resins contained in the separation functional layer 1 include polyether block amide resins, polyamide resins, polyether resins, polyimide resins, cellulose acetate resins, silicone resins and fluorine resins.
- the separation functional layer 1 preferably contains a polyether block amide resin. In this form, the separation functional layer 1 is preferably substantially made of resin.
- the separation functional layer 1 may further contain an additive such as a leveling agent in addition to the resin.
- the separation functional layer 1 contains an ionic liquid.
- the separation functional layer 1 has, for example, a double network gel containing an ionic liquid.
- a double network gel is a gel that has two types of network structures that are independent of each other.
- a double network gel includes, for example, a first network structure mainly composed of an organic material, a second network structure mainly composed of an inorganic material, and an ionic liquid.
- "mainly composed of” means that 50 wt% or more, or even 70 wt% or more is composed of the material.
- the organic material for forming the first network structure includes, for example, a polymer such as polyacrylamide (especially polydialkylacrylamide such as polydimethylacrylamide).
- the polymer contained in the organic material has a structural unit derived from an acrylamide derivative and may further contain a crosslinked structure.
- a polymer containing a crosslinked structure can be produced by a known method. For example, first, a prepolymer having structural units having N-hydroxysuccinimide ester groups is prepared. A structural unit having an N-hydroxysuccinimide ester group is derived from, for example, N-acryloxysuccinimide. Next, a polymer containing a crosslinked structure can be obtained by reacting the prepolymer with an amine-based crosslinking agent.
- Amine crosslinkers are compounds with two or more primary amino groups, such as ethylene glycol bis(3-aminopropyl) ether.
- the second network structure may include a network of multiple particles.
- a network of a plurality of particles is formed, for example, by bonding a plurality of particles to each other through hydrogen bonding.
- the particles included in the second network structure may contain an inorganic material or an organic material.
- Inorganic materials contained in the particles include, for example, silica, titania and alumina.
- the particles included in the second network structure are silica particles.
- examples of ionic liquids include ionic liquids having imidazolium, pyridinium, ammonium, or phosphonium and substituents having 1 or more carbon atoms.
- the substituent having 1 or more carbon atoms includes an alkyl group having 1 to 20 carbon atoms, a cycloalkyl group having 3 to 14 carbon atoms, and a cycloalkyl group having 3 to 14 carbon atoms. 6 or more and 20 or less aryl groups, etc., which may be further substituted with a hydroxy group, a cyano group, an amino group, a monovalent ether group or the like (for example, a hydroxyalkyl group having 1 or more and 20 or less carbon atoms etc).
- alkyl groups having 1 to 20 carbon atoms include methyl group, ethyl group, n-propyl group, n-butyl group, n-pentyl group, n-hexyl group, n-heptyl group, n-octyl group, n- nonyl group, n-decyl group, n-undecyl group, n-dodecyl group, n-tridecyl group, n-tetradecyl group, n-pentadecyl group, n-hexadecyl group, n-heptadecyl group, n-octadecyl group, n- nonadecyl group, n-eicosadecyl group, i-propyl group, sec-butyl group, i-butyl group, 1-methylbutyl group, 1-ethylpropyl group, 2-methylbutyl
- the above alkyl group may be substituted with a cycloalkyl group.
- the number of carbon atoms in the alkyl group substituted by the cycloalkyl group is, for example, 1 or more and 20 or less.
- Alkyl groups substituted by cycloalkyl groups include cyclopropylmethyl, cyclobutylmethyl, cyclohexylmethyl, cyclohexylpropyl groups and the like, which further include hydroxy, cyano, amino, monovalent ether It may be substituted with a group or the like.
- cycloalkyl groups having 3 to 14 carbon atoms include cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, cyclooctyl, cyclododecyl, norbornyl, bornyl and adamantyl groups. , and these may be further substituted with a hydroxy group, a cyano group, an amino group, a monovalent ether group, or the like.
- aryl group having 6 to 20 carbon atoms examples include phenyl, toluyl, xylyl, mesityl, anisyl, naphthyl, benzyl, etc. These are further hydroxy, cyano, amino, mono may be substituted with a valent ether group or the like.
- the compound having imidazolium and a substituent having 1 or more carbon atoms may further have a substituent such as an alkyl group, and may form a salt with a counter anion.
- Counter anions include alkylsulfate, tosylate, methanesulfonate, acetate, bis(fluorosulfonyl)imide, bis(trifluoromethanesulfonyl)imide, thiocyanate, dicyanamide, tricyanometanide, tetracyanoborate, hexafluorophosphate, tetrafluoro Examples include borates and halides, and bis(fluorosulfonyl)imide, bis(trifluoromethanesulfonyl)imide, dicyanamide, tricyanometanide, and tetracyanoborate are preferred from the viewpoint of gas separation performance.
- ionic liquids having imidazolium and substituents having 1 or more carbon atoms include 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide and 1-ethyl-3-methylimidazolium dicyanamide.
- 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide [EMI] [FSI]
- 1-ethyl-3-methylimidazolium dicyanamide [EMI] [DCA]
- 1-ethyl-3-methylimidazolium tricyanometanide [EMI] [TCM]
- 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [C mim] [ TF 2 N]
- 1-(2-hydroxyethyl)-3-methylimidazolium bis(trifluoromethanesulfonyl)imide [C 2 OHim][TF 2 N]
- the method for producing a double network gel is not particularly limited, and for example, the method disclosed in E.Kamio et al., Adv.Mater, 29, 1704118 (2017) can be used.
- the content of the ionic liquid in the double network gel is, for example, 50 wt% or more, preferably 60 wt% or more, more preferably 70 wt% or more, and still more preferably 80 wt% or more.
- the upper limit of the content of the ionic liquid is not particularly limited, and is, for example, 95 wt%.
- the content of the first network structure mainly composed of an organic material in the double network gel is, for example, 1 wt% or more, preferably 5 wt% or more, and more preferably 10 wt% or more.
- the upper limit of the content of the first network structure is, for example, 15 wt%.
- the content of the second network structure mainly composed of an inorganic material in the double network gel is, for example, 1 wt % or more from the viewpoint of improving the strength of the double network gel.
- the upper limit of the content of the second network structure is, for example, 5 wt%.
- the ratio of the sum of the weight of the first network structure and the weight of the second network structure to the weight of the double network gel is, for example, 2 wt% or more, preferably 5 wt% or more, and more preferably 10 wt% or more. . This proportion is preferably less than or equal to 20 wt%.
- the separation functional layer 1 is preferably substantially made of double network gel.
- the thickness of the separation functional layer 1 is, for example, 50 ⁇ m or less, preferably 25 ⁇ m or less, more preferably 15 ⁇ m or less.
- the thickness of the separation functional layer 1 may be 10 ⁇ m or less, 5.0 ⁇ m or less, or 2.0 ⁇ m or less depending on the case.
- the thickness of the separation functional layer 1 may be 0.05 ⁇ m or more, or may be 0.1 ⁇ m or more.
- the intermediate layer 2 is formed from the emulsion resin composition.
- Emulsion resin composition means a liquid containing a dispersion medium and a polymer emulsified in the dispersion medium.
- the emulsion resin composition preferably contains water as a dispersion medium. That is, the emulsion resin composition is preferably an oil-in-water (O/W) emulsion.
- the emulsion resin composition may contain an organic solvent as a dispersion medium instead of water or together with water.
- organic solvent contained in the emulsion resin composition examples include 2-ethylhexanol, butyl cellosolve, dipropylene glycol, ethylene glycol, propylene glycol, normal propyl alcohol, and isopropanol. From the viewpoint of dispersibility, ethylene glycol and propylene glycol are preferred.
- the emulsion resin composition contains, for example, a silicone-based polymer.
- a silicone-based polymer has, for example, a structural unit A represented by the following formula (1).
- R 1 and R 2 are each independently a hydrogen atom or a hydrocarbon group.
- the hydrocarbon group may be linear or branched.
- the number of carbon atoms in the hydrocarbon group is not particularly limited, and is, for example, 1-5, preferably 1-4, more preferably 1-3.
- the hydrocarbon group is preferably a linear or branched alkyl group. Examples of alkyl groups include methyl group, ethyl group, n-propyl group, isopropyl group, n-butyl group, isobutyl group, sec-butyl group and tert-butyl group.
- the hydrocarbon group may be an unsaturated hydrocarbon group such as a vinyl group.
- R 1 and R 2 are preferably hydrogen atoms, methyl groups, ethyl groups or vinyl groups.
- the number of structural units A contained in the silicone polymer is not particularly limited, and is, for example, 100 to 100,000, preferably 200 to 90,000, more preferably 500 to 80,000.
- the silicone-based polymer contains the structural unit A as a main component, and preferably consists essentially of the structural unit A only.
- the term "main component” means the structural unit that is the most contained on a weight basis among all the structural units that constitute the silicone-based polymer.
- the silicone-based polymer may further contain structural units other than the structural unit A.
- silicone-based polymers include dimethylpolysiloxane.
- the silicone-based polymer may be a cyclic siloxane represented by the following formula (2).
- R 1 and R 2 are the same as in formula (1).
- n is not particularly limited, and is, for example, 100 to 100,000, preferably 200 to 90,000, more preferably 500 to 80,000.
- the weight average molecular weight of the silicone polymer is not particularly limited, and is, for example, 1 ⁇ 10 4 to 1 ⁇ 10 6 .
- the silicone polymer is dispersed, for example, in the form of particles.
- the average particle size of the silicone-based polymer is not particularly limited, and is, for example, 10 to 1000 nm, preferably 50 to 800 nm.
- the average particle size means the median size specified from the particle size distribution measured by a particle size distribution analyzer based on the laser diffraction/scattering method.
- the average particle size of the silicone-based polymer is determined by a method that complies with ISO 13320:2009 "Particle size analysis - laser diffraction method -" using a laser diffraction/scattering particle size distribution analyzer (for example, Beckman Coulter Co., Ltd. It can be measured using LS 13 320).
- the method for producing an emulsion resin composition containing a silicone-based polymer is not particularly limited, and known methods disclosed in JP-A-2004-339283 and the like can be used as appropriate.
- the emulsion resin composition may further contain a surfactant for dispersing the silicone polymer.
- surfactants include anionic surfactants such as alkyl sulfates, alkylbenzene sulfonates, and alkyl phosphates; nonionic surfactants such as polyoxyethylene alkyl ethers, polyoxyethylene alkylphenyl ethers, and polyoxyethylene fatty acid esters.
- anionic surfactants such as quaternary ammonium salts and alkylamine acetates
- amphoteric surfactants such as alkylbetaines and alkylimidazolines.
- nonionic surfactants such as polyoxyethylene alkyl ethers and polyoxyethylene alkylphenyl ethers are preferably used from the viewpoint of the dispersion stability of the silicone polymer.
- these nonionic surfactants include polyoxyethylene octyl ether, polyoxyethylene nonyl ether, polyoxyethylene decyl ether, polyoxyethylene lauryl ether, polyoxyethylene tridecyl ether, polyoxyethylene myristyl ether, Polyoxyethylene cetyl ether, polyoxyethylene stearyl ether, polyoxyethylene octylphenyl ether, polyoxyethylene nonylphenyl ether, polyoxyethylene styrenated phenyl ether and the like.
- Surfactant can be used individually by 1 type or in combination of 2 or more types.
- the emulsion resin composition may contain a hydrophilic polymer instead of the silicone polymer or together with the silicone polymer.
- hydrophilic polymer means a polymer having a contact angle with water of 100° or less, preferably 90° or less, more preferably 85.2° or less.
- the contact angle with water can be evaluated by the static drop method specified in Japanese Industrial Standards (JIS) R3257:1999 using a sheet composed of the polymer to be evaluated.
- JIS Japanese Industrial Standards
- the lower limit of the contact angle of the hydrophilic polymer with water is not particularly limited, but may be, for example, 30°, may be 50°, or may be 74.0°.
- Hydrophilic polymers include, for example, at least one selected from the group consisting of urethane-based polymers, (meth)acrylic-based polymers, (meth)acrylic-urethane-based polymers, ester-based polymers and vinyl ester-based polymers, preferably urethane-based Contains polymer.
- Urethane-based polymers include, for example, polyurethanes obtained by the reaction of polyols and polyisocyanates, and modified products thereof.
- the urethane-based polymer may be a urethane prepolymer having terminal isocyanate groups or blocked isocyanate groups.
- polyols examples include polyether polyols such as polyethylene glycol, polypropylene glycol, and polyoxytetramethylene ether glycol obtained by ring-opening polymerization of ethylene oxide, propylene oxide, tetrahydrofuran, etc.; ethylene glycol, diethylene glycol, triethylene glycol; , 1,2-propanediol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, neopentyl glycol, pentanediol, 3-methyl-1,5-pentanediol, 1,6 -Saturated or unsaturated low-molecular-weight glycols such as hexanediol, octanediol, 1,4-butynediol, dipropylene glycol, bisphenol A, bisphenol A propylene oxide adduct, bisphenol A ethylene oxide adduct,
- polyols such as glycerin, trimethylolpropane, trimethylolethane, 1,2,6-hexanetriol, 1,2,4-butanetriol, pentaerythritol, and sorbitol are used in place of the above low-molecular-weight glycols.
- the polyol preferably has a hydrophilic part such as an ethylene oxide adduct.
- Aromatic, aliphatic or alicyclic diisocyanates can be used as the polyisocyanate.
- diisocyanates include 1,5-naphthylene diisocyanate, 4,4′-diphenylmethane diisocyanate, 4,4′-diphenyldimethylmethane diisocyanate, 4,4′-dibenzyl isocyanate, dialkyldiphenylmethane diisocyanate, and tetraalkyldiphenylmethane diisocyanate.
- blocking agents for isocyanate groups include phenols, alcohols, lactams, oximes and active methylene compounds containing bisulfites and sulfonic acid groups.
- the urethane-based polymer may have a hydrophilic group such as a carboxylate introduced therein.
- a (meth)acrylic polymer has, for example, a structural unit derived from an alkyl (meth)acrylate as a main component.
- (meth)acrylate means acrylate and/or methacrylate.
- the alkyl group contained in the alkyl (meth)acrylate is not particularly limited, and is, for example, a linear, branched or cyclic alkyl group having 2 to 14 carbon atoms.
- alkyl (meth)acrylates include alkyl acrylates having alkyl groups of 2 to 14 carbon atoms, preferably alkyl acrylates having alkyl groups of 4 to 9 carbon atoms.
- alkyl acrylate esters include n-butyl acrylate, isobutyl acrylate, s-butyl acrylate, isoamyl acrylate, hexyl acrylate, heptyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, and isooctyl acrylate. , nonyl acrylate, and isononyl acrylate.
- the alkyl (meth)acrylate may be, for example, a methacrylic acid alkyl ester having an alkyl group having 2 to 14 carbon atoms, preferably a methacrylic acid alkyl ester having an alkyl group having 2 to 10 carbon atoms.
- methacrylic acid alkyl esters include ethyl methacrylate, propyl methacrylate, isopropyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, s-butyl methacrylate, t-butyl methacrylate, 2-ethylhexyl methacrylate, and methacrylic acid. cyclohexyl acid, bornyl methacrylate, isobornyl methacrylate and the like.
- Alkyl (meth)acrylates can be used singly or in combination of two or more.
- the content of structural units derived from alkyl (meth)acrylate in the (meth)acrylic polymer is not particularly limited, and is, for example, 70 to 100 wt%, preferably 85 to 99 wt%, more preferably 87 to 99 wt%. %.
- the (meth)acrylic polymer may further contain a structural unit derived from a copolymerizable monomer copolymerizable with the alkyl (meth)acrylate.
- copolymerizable monomers include carboxyl group-containing monomers such as acrylic acid, methacrylic acid, carboxyethyl (meth)acrylate, carboxypentyl (meth)acrylate, itaconic acid, maleic acid, fumaric acid, and crotonic acid; Alkyl (meth)acrylates having 15 or more alkyl groups; (meth)acrylic acid aryl esters such as phenyl (meth)acrylate; vinyl esters such as vinyl acetate and vinyl propionate; styrene-based monomers such as styrene; Epoxy group-containing monomers such as glycidyl acrylate and methyl glycidyl (meth)acrylate; hydroxyl group-containing (meth)acrylates such as 2-hydroxyeth
- Olefin-based monomers vinyl ether-based monomers such as vinyl ether; halogen atom-containing monomers such as vinyl chloride; - vinyl group-containing heterocyclic compounds such as vinylpiperazine, N-vinylpyrazine, N-vinylpyrrole, N-vinylimidazole, N-vinyloxazole, N-vinylmorpholine; N-vinylcarboxylic acid amide; N-cyclohexylmaleimide, N - Maleimide monomers such as isopropyl maleimide, N-lauryl maleimide, N-phenyl maleimide; N-methyl itaconimide, N-ethyl itaconimide, N-butyl itaconimide, N-octyl itaconide Itaconimide-based monomers such as imide, N-2-ethylhexylitaconimide, N-cyclohexylitaconimide, N-laurylita
- (mono- or poly)alkylene glycol di(meth)acrylate (mono- or poly)alkylene glycol di(meth)acrylate; neopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, pentaerythritol di(meth)acrylate, trimethylolpropane tri(meth) esters of (meth)acrylic acid and polyhydric alcohols such as acrylates, pentaerythritol tri(meth)acrylate, and dipentaerythritol hexa(meth)acrylate; polyfunctional vinyl compounds such as divinylbenzene; allyl (meth)acrylate, Examples thereof include compounds having a reactive unsaturated double bond such as vinyl (meth)acrylate.
- (Meth)acrylic urethane-based polymers include, for example, reaction products of (meth)acrylic polyol and polyisocyanate.
- (Meth)acrylic polyols include, for example, (meth)acrylic polymers containing structural units derived from hydroxyl group-containing (meth)acrylates. Hydroxyl group-containing (meth)acrylates include those described above for (meth)acrylic polymers.
- Polyisocyanates include those described above for urethane-based polymers.
- the polyisocyanate may be a urethane prepolymer having isocyanate groups.
- ester-based polymers include those obtained by polycondensation of dicarboxylic acids and diols.
- Dicarboxylic acids include, for example, phthalic acid, isophthalic acid, terephthalic acid, 2-methylterephthalic acid, 5-sulfoisophthalic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyletherdicarboxylic acid, 4,4' -diphenylketonedicarboxylic acid, 4,4'-diphenoxyethanedicarboxylic acid, 4,4'-diphenylsulfonedicarboxylic acid, 1,4-naphthalenedicarboxylic acid, 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid , 2,7-naphthalenedicarboxylic acid and other aromatic dicarboxylic acids; 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicar
- diols examples include ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, 1,3-propanediol, 1,5-pentanediol, neopentyl glycol, 1,4-butanediol, and 1,6-hexane.
- Aliphatic diols such as diols, 1,8-octanediol, and polyoxytetramethylene glycol; 1,2-cyclohexanediol, 1,4-cyclohexanediol, 1,1-cyclohexanedimethylol, 1,4-cyclohexanedimethylol, etc.
- aromatic diols such as xylylene glycol, 4,4'-dihydroxybiphenyl, 2,2-bis(4'-hydroxyphenyl)propane and bis(4-hydroxyphenyl)sulfone. These can be used individually by 1 type or in combination of 2 or more types.
- a vinyl ester-based polymer has, for example, structural units derived from vinyl ester.
- Vinyl esters include, for example, vinyl acetate and vinyl propionate.
- the vinyl ester polymer may further have structural units derived from olefins such as ethylene and propylene.
- a specific example of the vinyl ester polymer is an ethylene-vinyl acetate copolymer.
- the weight average molecular weight of the hydrophilic polymer is not particularly limited, and is, for example, 1 ⁇ 10 4 to 1 ⁇ 10 7 .
- the hydrophilic polymer is dispersed, for example, in the form of particles.
- the average particle size of the hydrophilic polymer is not particularly limited, and is, for example, 10 to 1000 nm, preferably 50 to 800 nm.
- the average particle size of the hydrophilic polymer can be measured by the method described above for the silicone-based polymer.
- An emulsion resin composition containing a hydrophilic polymer can be produced, for example, by subjecting a monomer component for forming the hydrophilic polymer to emulsion polymerization in the presence of an emulsifier (surfactant).
- the emulsion resin composition may further contain a surfactant for dispersing the hydrophilic polymer.
- surfactants include, for example, those described above for silicone-based polymers.
- the emulsion resin composition may further contain a surfactant other than the surfactant for dispersing the silicone-based polymer or hydrophilic polymer described above.
- a surfactant other than the surfactant for dispersing the silicone-based polymer or hydrophilic polymer described above.
- the wettability of the emulsion resin composition to a metal roll provided in a coater such as a gravure coater can be improved. Therefore, when the emulsion resin composition contains other surfactants, there is a tendency that the emulsion resin composition can be uniformly applied using a coater equipped with a metal roll. Uniform application of the emulsion resin composition tends to suppress variations in thickness of the intermediate layer 2 formed from the emulsion resin composition.
- Silicone-based surfactants include, for example, modified polysiloxanes having hydrophilic groups. Hydrophilic groups include hydroxyl groups, carboxylic acid groups, sulfonic acid groups, (meth)acrylic groups, ester groups, ether groups and the like. Specific examples of the modifying group of the modified polysiloxane include -(CH 2 CH 2 O) n -R (n is an integer of 5 to 30, R is a hydrogen atom or an alkyl group having 1 to 6 carbon atoms), -(CH 2CHOHCH 2 ) n —H (n is an integer of 5 to 30) and the like.
- modified polysiloxane examples include polyether-modified polydimethylsiloxane.
- silicone-based surfactants “BYK” series manufactured by Big Chemie Japan, “Toray Silicone” series manufactured by Toray Dow Corning, “TSF” series manufactured by Momentive Performance Materials, Shin-Etsu Silicone Co., Ltd. "KP” series, “KF” series, etc. are commercially available.
- BYK-349 is an example of the "BYK” series manufactured by BYK-Chemie Japan. BYK-349 tends to be able to suppress a decrease in the permeation rate of carbon dioxide passing through the intermediate layer 2 . BYK-349 has high dispersibility in water and is suitable for emulsion resin compositions containing water as a dispersion medium.
- the emulsion resin composition may further contain a cross-linking agent for cross-linking the silicone polymer and the hydrophilic polymer.
- the emulsion resin composition may contain a water-insoluble cross-linking agent for cross-linking a (meth)acrylic polymer having structural units derived from a carboxyl group-containing monomer.
- the water-insoluble cross-linking agent is, for example, a water-insoluble compound having two or more (eg, 2 to 6, preferably 3 to 5) functional groups capable of reacting with carboxyl groups.
- water-insoluble means that the weight of a compound that can be dissolved in 100 parts by weight of water at 25°C is 5 parts by weight or less, preferably 3 parts by weight or less, and more preferably 2 parts by weight or less. do.
- the weight of water-soluble compounds can be measured by the following method. First, the same weight of water (25° C.) and the compound are mixed and stirred with a stirrer at 300 rpm for 10 minutes. The resulting mixture is separated into an aqueous phase and an oil phase by centrifugation. The aqueous phase is then removed and dried at 120° C. for 1 hour. From the loss on drying, the weight of non-volatile components in the aqueous phase (the weight of compounds that can be dissolved in 100 parts by weight of water) is calculated.
- the functional group that can react with the carboxyl group is not particularly limited, and examples thereof include an epoxy group, an isocyanate group, a carbodiimide group, and the like, with the epoxy group being preferred from the viewpoint of reactivity.
- a glycidylamino group is preferable from the viewpoint that unreacted products of the cross-linking reaction are less likely to remain because of its high reactivity, which is advantageous for low staining. That is, as the water-insoluble cross-linking agent, an epoxy-based cross-linking agent having an epoxy group is preferable, and a cross-linking agent having a glycidylamino group (glycidylamino-based cross-linking agent) is particularly preferable.
- water-insoluble cross-linking agents examples include 1,3-bis(N,N-diglycidylaminomethyl)cyclohexane (for example, manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name “TETRAD-C”, etc.) [water at 25° C., 100 weight 2 parts by weight or less], 1,3-bis(N,N-diglycidylaminomethyl)benzene (for example, manufactured by Mitsubishi Gas Chemical Co., Ltd., trade name "TETRAD-X” etc.) [25 2 parts by weight or less that can be dissolved in 100 parts by weight of water at °C]; ”, etc.) [2 parts by weight or less that can be dissolved in 100 parts by weight of water at 25° C.] and other epoxy-based cross-linking agents are exemplified.
- a water-insoluble crosslinking agent can be used individually or in combination of 2 or more types.
- the emulsion resin composition may further contain a filler.
- a filler may contain an inorganic material and may contain an organic material. Examples of inorganic materials contained in the filler include zeolite and silica.
- the filler preferably has, for example, hydrophilicity and high dispersibility in water.
- the filler has, for example, a particle shape.
- the average particle size of the filler is, for example, smaller than the thickness of the intermediate layer 2 formed from the emulsion resin composition.
- the average particle size of the filler is, for example, 150 nm or less, may be 100 nm or less, or may be 50 nm or less.
- the lower limit of the average particle size of the filler is not particularly limited, and is, for example, 1 nm.
- the average particle size of the filler can be measured by the method described above for the silicone-based polymer.
- the filler may have pores.
- the average pore diameter of the filler is not particularly limited, and is, for example, 0.1 nm to 5 nm.
- the density of the filler is not particularly limited and is, for example, 0.5-5 g/cm 3 .
- fillers include the "Zeoal” series manufactured by Nakamura Choukou Co., Ltd. and the "AEROSIL” series manufactured by Nippon Aerosil.
- the "Zeoal” series manufactured by Nakamura Choukou Co., Ltd. includes Zeoal 4A 50 nm and Zeoal ZSM-5. These fillers contain zeolites.
- the "AEROSIL” series manufactured by Nippon Aerosil Co., Ltd. includes AEROSILOX50 and the like. This filler contains silica. Zeoal 4A 50 nm and AEROSILOX 50 tend to have higher hydrophilicity and higher dispersibility in water than Zeoal ZSM-5.
- the solid content concentration in the emulsion resin composition is not particularly limited, and is, for example, 10 to 60 wt%.
- the ratio of the weight of the surfactant to the weight of all solids in the emulsion resin composition is not particularly limited. It may be present, and may be 1 wt % or less. If the weight ratio of the surfactant is 15 wt % or less, for example, when the emulsion resin composition is applied onto the porous support 3, the emulsion resin composition does not penetrate into the porous support 3. can be sufficiently suppressed.
- the intermediate layer 2 can be produced, for example, by removing the dispersion medium from the emulsion resin composition. Therefore, the intermediate layer 2 contains components derived from the emulsion resin composition. As an example, the intermediate layer 2 contains at least one selected from the group consisting of a silicone polymer and a hydrophilic polymer, and preferably contains both a silicone polymer and a hydrophilic polymer.
- the silicone-based polymer contained in the intermediate layer 2 may be a crosslinked product of the silicone-based polymer contained in the emulsion resin composition.
- the hydrophilic polymer contained in the intermediate layer 2 may be a crosslinked product of the hydrophilic polymer contained in the emulsion resin composition.
- a separation membrane 10 comprising:
- the content of the silicone-based polymer in the intermediate layer 2 is not particularly limited, and is, for example, 10 wt% or more, preferably 30 wt% or more, more preferably 50 wt% or more, and still more preferably 70 wt% or more. It is particularly preferably 80 wt% or more, may be 90 wt% or more, may be 95 wt% or more, or may be 99 wt% or more.
- the intermediate layer 2 may be substantially composed of a silicone-based polymer. There is a tendency that the higher the content of the silicone-based polymer in the intermediate layer 2 , the higher the permeation rate of the permeating fluid through the separation membrane 10 . However, the content of the silicone-based polymer in the intermediate layer 2 may be less than 10 wt%, or may be 5 wt% or less.
- the intermediate layer 2 may be substantially free of silicone-based polymer.
- the content of the hydrophilic polymer in the intermediate layer 2 is not particularly limited, and is, for example, 1 wt% or more, preferably 5 wt% or more, more preferably 10 wt% or more. As the hydrophilic polymer content in the intermediate layer 2 increases, the adhesion between the separation functional layer 1 and the intermediate layer 2 tends to improve.
- the upper limit of the content of the hydrophilic polymer in the intermediate layer 2 is not particularly limited, and is, for example, 90 wt%, preferably 70 wt%, more preferably 50 wt%, still more preferably 30 wt%. Preferably it is 20 wt%.
- the hydrophilic polymer content in the intermediate layer 2 is preferably 10 wt % to 20 wt %. However, depending on the case, the intermediate layer 2 may be substantially composed of a hydrophilic polymer, and may be substantially free of a hydrophilic polymer.
- the intermediate layer 2 may further contain components other than the silicone-based polymer and the hydrophilic polymer.
- Other components include, for example, surfactants and fillers derived from the emulsion resin composition. That is, the intermediate layer 2 may contain a surfactant or a filler.
- the filler when the intermediate layer 2 contains a filler, the filler is embedded in a matrix containing a silicone-based polymer or a hydrophilic polymer, preferably dispersed in the matrix. In the intermediate layer 2, the filler may be partially agglomerated.
- the content of the surfactant in the intermediate layer 2 is not particularly limited, and is, for example, 15 wt % or less, may be 5 wt % or less, or may be 1 wt % or less.
- the lower limit of the surfactant content is not particularly limited, and is, for example, 0.1 wt%.
- the filler content in the intermediate layer 2 is not particularly limited, and is, for example, 60 wt % or less, may be 40 wt % or less, may be 20 wt % or less, or may be 10 wt % or less.
- the lower limit of the filler content is not particularly limited, and is, for example, 1 wt%.
- the thickness of the intermediate layer 2 is not particularly limited, and is, for example, less than 50 ⁇ m, preferably 40 ⁇ m or less, more preferably 30 ⁇ m or less, still more preferably 10 ⁇ m or less, and particularly preferably 5 ⁇ m or less. There is a tendency that the smaller the thickness of the intermediate layer 2 is, the more the reduction in the permeation rate of the permeating fluid from the separation membrane 10 can be suppressed.
- the lower limit of the thickness of the intermediate layer 2 is not particularly limited, and is, for example, 0.1 ⁇ m.
- porous support 3 supports the separation functional layer 1 with the intermediate layer 2 interposed therebetween.
- Porous support 3 includes, for example, nonwoven fabric; porous polytetrafluoroethylene; aromatic polyamide fiber; porous metal; sintered metal; porous ceramic; silicone; silicone rubber; polyvinyl fluoride, polyvinylidene fluoride, polyurethane, polypropylene, polyethylene, polycarbonate, polysulfone, polyether ether ketone, polyacrylonitrile, polyimide and polyphenylene oxide permeable containing at least one selected from the group consisting of porous) polymers; metal foams with open or closed cells; polymer foams with open or closed cells; silica;
- the porous support 3 may be a combination of two or more of these.
- the porous support 3 preferably contains polyvinylidene fluoride (PVDF).
- the porous support 3 has an average pore size of, for example, 0.01-0.4 ⁇ m.
- the thickness of the porous support 3 is not particularly limited, and is, for example, 10 ⁇ m or more, preferably 20 ⁇ m or more, more preferably 50 ⁇ m or more.
- the thickness of the porous support 3 is, for example, 300 ⁇ m or less, preferably 200 ⁇ m or less, more preferably 150 ⁇ m or less.
- the method for producing the separation membrane 10 of the present embodiment includes, for example, coating the emulsion resin composition on the porous support 3 to form a coating film, and drying the coating film to form the intermediate layer 2. forming.
- the method for preparing the emulsion resin composition is not particularly limited.
- an emulsion resin composition may be prepared by adding a surfactant, filler, etc. to an emulsion containing a silicone-based polymer and/or a hydrophilic polymer.
- a slurry containing a filler and a dispersion medium eg, water
- the surface of the porous support 3 to which the emulsion resin composition is applied preferably has a relatively large contact angle with water.
- the surface of the porous support 3 having a large contact angle with water is suitable for preventing the emulsion resin composition containing water as a dispersion medium from penetrating into the porous support 3 .
- the contact angle of water on the surface of the porous support 3 is, for example, 60° or more, preferably 70° or more.
- the upper limit of this contact angle is not particularly limited, and is, for example, 120°.
- the contact angle can be evaluated by the static drop method specified in JIS R3257:1999.
- the method of applying the emulsion resin composition is not particularly limited, and for example, a spin coating method, a dip coating method, or the like can be used.
- a wire bar or the like may be used to apply the emulsion resin composition.
- the method of applying the emulsion resin composition may be a method using a metal roll, such as a gravure coating method.
- the coating film can be dried, for example, under heating conditions.
- the heating temperature of the coating film is, for example, 50° C. or higher.
- the heating time of the coating film is, for example, 1 minute or longer, and may be 5 minutes or longer.
- the thickness of the intermediate layer 2 can be adjusted, for example, by the solid content concentration in the emulsion resin composition and the thickness of the coating film.
- the surface of the intermediate layer 2 can be subjected to an easy-adhesion treatment as necessary.
- the adhesion-facilitating treatment includes surface treatment such as application of a primer, corona discharge treatment, and plasma treatment.
- a coating liquid containing the material for the separation functional layer 1 is prepared.
- a coating liquid containing the material of the separation functional layer 1 is applied onto the intermediate layer 2 to obtain a coating film.
- the separation function layer 1 can be formed by drying this coating film.
- the surface of the intermediate layer 2 to which the coating liquid is applied preferably has a relatively small contact angle with water.
- the surface of the intermediate layer 2 having a small contact angle with water is suitable for improving adhesion with the separation functional layer 1 .
- the contact angle of water on the surface of the intermediate layer 2 is, for example, 120° or less, preferably 110° or less.
- the lower limit of this contact angle is not particularly limited, and is, for example, 70°.
- the contact angle can be evaluated by the static drop method specified in JIS R3257:1999.
- the intermediate layer 2 having a surface with a small contact angle with water tends to have excellent adhesion to the porous support 3 .
- the peel force P1 of the intermediate layer 2 to the porous support 3 is, for example, 0.1 N/18 mm or more, preferably 0.2 N/18 mm or more, and more preferably 0.3 N/18 mm or more. , more preferably 0.4 N/18 mm or more, and particularly preferably 0.5 N/18 mm or more.
- the upper limit of the peeling force P1 is not particularly limited, and is, for example, 2.0 N/18 mm.
- the peeling force P1 can be measured by the following method. First, a laminate of the intermediate layer 2 and the porous support 3 to be evaluated is cut into a piece having a width of 25 mm and a length of 100 mm to obtain a test piece. Next, a single-sided adhesive tape (No. 7235, width 18 mm, manufactured by Nitto Denko) is attached to the intermediate layer 2 provided on the test piece, and a 2-kg roller is reciprocated once to press them together. Next, using a commercially available tensile tester, the intermediate layer 2 is peeled off from the porous support 3 together with the single-sided adhesive tape at a peeling angle of 90° and a peeling speed of 300 mm/min. The peeling force at this time is specified as the peeling force P1. Note that the above measurements are performed in an atmosphere of 23°C.
- the method and conditions described above for the intermediate layer 2 can be used for the coating method and drying conditions of the coating liquid.
- the coating liquid containing the material of the separation functional layer 1 may be applied by spin coating. Separation membrane 10 is obtained by forming separation functional layer 1 on intermediate layer 2 .
- the intermediate layer 2 is made of the emulsion resin composition. According to the studies of the present inventors, even if the emulsion resin composition is applied onto the porous support 3 , the polymer contained in the emulsion resin composition hardly penetrates into the porous support 3 . In particular, when the emulsion resin composition contains water as a dispersion medium and the contact angle of the surface of the porous support 3 with respect to water is large, the permeation of the polymer into the porous support 3 is remarkably suppressed. be done.
- the formed intermediate layer 2 Since the penetration of the polymer into the inside of the porous support 3 is suppressed, in the formed intermediate layer 2, variations in thickness and occurrence of defects such as pinholes are suppressed.
- the emulsion resin composition it is possible to easily produce the intermediate layer 2 having a relatively small thickness while suppressing variations in thickness.
- forming the separation functional layer 1 on the intermediate layer 2 made of the emulsion resin composition tends to suppress variations in separation performance in the separation membrane 10 .
- the separation membrane 10 can, for example, preferentially permeate an acid gas contained in a mixed gas.
- the permeation rate T1 of carbon dioxide permeating through the separation membrane 10 is, for example, 10 GPU or more, preferably 50 GPU or more, and more preferably 100 GPU or more.
- the upper limit of the transmission speed T1 is not particularly limited, and is, for example, 500 GPU.
- GPU means 10 ⁇ 6 ⁇ cm 3 (STP)/(sec ⁇ cm 2 ⁇ cmHg).
- cm 3 (STP) means the volume of carbon dioxide at 1 atmosphere and 0°C.
- the permeation speed T1 can be calculated by the following method. First, a mixed gas containing carbon dioxide and nitrogen is supplied to a space adjacent to one surface of the separation membrane 10 (for example, the main surface 11 of the separation membrane 10 on the side of the separation functional layer), and the other surface of the separation membrane 10 is supplied. A space adjacent to (for example, the main surface 12 of the separation membrane 10 on the porous support side) is decompressed. As a result, a permeated fluid that has passed through the separation membrane 10 is obtained. The weight of the permeate and the volume fraction of carbon dioxide and nitrogen in the permeate are measured. The permeation rate T1 can be calculated from the measurement results.
- the concentration of carbon dioxide in the gas mixture is 50 vol% under standard conditions (0°C, 101 kPa).
- the mixed gas supplied to the space adjacent to one side of the separation membrane 10 has a temperature of 30° C. and a pressure of 0.1 MPa.
- the space adjacent to the other surface of the separation membrane 10 is decompressed so that the pressure in the space is 0.1 MPa lower than the atmospheric pressure in the measurement environment.
- the separation coefficient ⁇ 1 of carbon dioxide with respect to nitrogen of the separation membrane 10 is not particularly limited, and is, for example, 20 or more, preferably 40 or more.
- the upper limit of the separation factor ⁇ 1 is not particularly limited, and is 100, for example.
- the variation coefficient of the permeation rate T1 of carbon dioxide permeating the separation membrane 10 and the variation coefficient of the separation coefficient ⁇ 1 of carbon dioxide with respect to nitrogen of the separation membrane 10 tend to be small.
- the variation coefficient of the permeation rate T1 of carbon dioxide permeating the separation membrane 10 is, for example, less than 0.18, preferably 0.15 or less, more preferably 0.10 or less, and even more preferably 0.05 or less.
- the lower limit of the variation coefficient of the permeation rate T1 is not particularly limited, and is, for example, 0.001.
- the coefficient of variation of the permeation rate T1 can be identified by the following method.
- the separation membrane 10 is cut to prepare at least three test pieces.
- the carbon dioxide permeation rate T1 is measured by the method described above.
- the average value and standard deviation of the obtained permeation rates T1 are calculated.
- the ratio of the standard deviation to the mean value can be regarded as the coefficient of variation of the permeation rate T1.
- the variation coefficient of the separation coefficient ⁇ 1 of carbon dioxide with respect to nitrogen of the separation membrane 10 is, for example, 0.50 or less, preferably 0.40 or less, more preferably 0.30 or less, and still more preferably 0.20. or less, and particularly preferably 0.10 or less.
- the lower limit of the coefficient of variation of the separation factor ⁇ 1 is not particularly limited, and is, for example, 0.001.
- the coefficient of variation of the separation factor ⁇ 1 can be specified by the following method. First, the separation membrane 10 is cut to prepare at least three test pieces. For each test piece, the separation factor ⁇ 1 is determined by the method described above. The average value and standard deviation of the resulting separation factor ⁇ 1 are calculated. The ratio of the standard deviation to the mean value can be regarded as the coefficient of variation of the separation factor ⁇ 1.
- the permeation rate T2 of carbon dioxide permeating the intermediate layer 2 is, for example, 10 GPU or more, preferably 500 GPU or more, more preferably 1000 GPU or more, still more preferably 1100 GPU or more, and particularly preferably 1500 GPU or more. , particularly preferably 2000 GPU or more, and may be 3000 GPU or more.
- the upper limit of the transmission speed T2 is not particularly limited, and is, for example, 10000 GPUs.
- the permeation rate T2 can be measured by the same method as for the permeation rate T1 except that the laminate of the intermediate layer 2 and the porous support 3 is used instead of the separation membrane 10 .
- the separation coefficient ⁇ 2 of carbon dioxide from nitrogen in the intermediate layer 2 is not particularly limited, and is, for example, 1 or more, preferably 5 or more.
- the upper limit of the separation factor ⁇ 2 is not particularly limited, and is 20, for example.
- the separation factor ⁇ 2 can be calculated in the same manner as the separation factor ⁇ 1.
- the degree of variation in separation performance in the separation membrane 10 can be predicted from the degree of variation in separation performance in the intermediate layer 2 . That is, there is a tendency that the more the variation in the separation performance in the intermediate layer 2 is suppressed, the more the variation in the separation performance in the separation membrane 10 is suppressed.
- the variation coefficient of the permeation rate T2 of carbon dioxide permeating the intermediate layer 2 is, for example, 0.50 or less, preferably 0.40 or less, more preferably 0.30 or less, and still more preferably 0.20. or less, and particularly preferably 0.15 or less.
- the lower limit of the variation coefficient of the permeation rate T2 is not particularly limited, and is, for example, 0.001.
- the coefficient of variation of the permeation rate T2 can be specified by the same method as the coefficient of variation of the permeation rate T1, except that the laminate of the intermediate layer 2 and the porous support 3 is used instead of the separation membrane 10 .
- the variation coefficient of the separation factor ⁇ 2 of carbon dioxide with respect to nitrogen in the intermediate layer 2 is, for example, 0.40 or less, preferably 0.30 or less, more preferably 0.20 or less, and still more preferably 0.10. It is below.
- the lower limit of the coefficient of variation of the separation factor ⁇ 2 is not particularly limited, and is, for example, 0.001.
- the variation coefficient of the separation coefficient ⁇ 2 can be specified by the same method as the variation coefficient of the separation coefficient ⁇ 1 except that the laminate of the intermediate layer 2 and the porous support 3 is used instead of the separation membrane 10 .
- the peeling force P2 of the separation functional layer 1 with respect to the intermediate layer 2 is not particularly limited, and is, for example, 0.4 N/10 mm or more, preferably 1.0 N/10 mm or more. It is preferably 2.0 N/10 mm or more, more preferably 3.0 N/10 mm or more, and particularly preferably 4.0 N/10 mm or more.
- the upper limit of the peeling force P2 is not particularly limited, and is, for example, 10.0 N/10 mm.
- the peeling force P2 of the separation functional layer 1 from the intermediate layer 2 can be adjusted by, for example, the type and content of the hydrophilic polymer contained in the intermediate layer 2.
- the peeling force P2 can be measured by the following method. First, the separation membrane 10 to be evaluated is cut into a 10 mm wide ⁇ 50 mm long test piece. Next, the entire surface of the separation functional layer 1 included in the test piece is superimposed on a film made of polyethylene terephthalate via a double-sided adhesive tape (No. 500 manufactured by Nitto Denko), and a 2 kg roller is reciprocated once. Crimp them. Next, using a commercially available tensile tester, the separation functional layer 1 is peeled off from the intermediate layer 2 together with the film at a peeling angle of 90° and a peeling speed of 300 mm/min. The peeling force at this time is specified as the peeling force P2. Note that the above measurements are performed in an atmosphere of 23°C.
- the double-sided adhesive tape (No. 500) used in measuring the peeling force P2 has a larger adhesive force than the single-sided adhesive tape (No. 7235) used in measuring the peeling force P1.
- Applications of the separation membrane 10 of the present embodiment include applications for separating acidic gases from mixed gases containing acidic gases.
- the acid gas of the mixed gas includes carbon dioxide, hydrogen sulfide, carbonyl sulfide, sulfur oxides (SOx), hydrogen cyanide, nitrogen oxides (NOx), etc. Carbon dioxide is preferred.
- the mixed gas contains other gases than acid gas. Other gases include, for example, hydrogen, non-polar gases such as nitrogen, and inert gases such as helium, preferably nitrogen.
- the separation membrane 10 of this embodiment is suitable for separating carbon dioxide from a mixed gas containing carbon dioxide and nitrogen.
- the application of the separation membrane 10 is not limited to the application of separating acidic gas from the mixed gas.
- the membrane separation device 100 of this embodiment includes a separation membrane 10 and a tank 20 .
- the tank 20 has a first chamber 21 and a second chamber 22 .
- Separation membrane 10 is arranged inside tank 20 . Inside the tank 20 , the separation membrane 10 separates the first chamber 21 and the second chamber 22 . Separation membrane 10 extends from one of a pair of wall surfaces of tank 20 to the other.
- the first chamber 21 has an entrance 21a and an exit 21b.
- the second chamber 22 has an outlet 22a.
- Each of the inlet 21a, the outlet 21b, and the outlet 22a is an opening formed in the wall surface of the tank 20, for example.
- Membrane separation using the membrane separation device 100 is performed, for example, by the following method.
- a mixed gas 30 containing acid gas is supplied to the first chamber 21 through the inlet 21a.
- the concentration of the acid gas in the mixed gas 30 is not particularly limited, and is, for example, 0.01 vol% (100 ppm) or more, preferably 1 vol% or more, more preferably 10 vol% or more, and even more preferably, under standard conditions. is 30 vol% or more, particularly preferably 50 vol% or more.
- the upper limit of the acid gas concentration in the mixed gas 30 is not particularly limited, and is, for example, 90 vol % under standard conditions.
- the membrane separation device 100 may further include a pump (not shown) for pressurizing the mixed gas 30 .
- the pressure of the mixed gas 30 supplied to the first chamber 21 is, for example, 0.1 MPa or higher, preferably 0.3 MPa or higher.
- the pressure in the second chamber 22 may be reduced while the mixed gas 30 is supplied to the first chamber 21 .
- the membrane separation device 100 may further include a pump (not shown) for reducing the pressure inside the second chamber 22 .
- the second chamber 22 may be depressurized such that the space inside the second chamber 22 is, for example, 10 kPa or more, preferably 50 kPa or more, and more preferably 100 kPa or more less than the atmospheric pressure in the measurement environment.
- a permeate fluid 35 having a higher acid gas content than the mixed gas 30 can be obtained on the other side of the separation membrane 10 . That is, the permeating fluid 35 is supplied to the second chamber 22 .
- the permeating fluid 35 contains, for example, acid gas as a main component. However, the permeating fluid 35 may contain a small amount of gas other than the acid gas.
- the permeated fluid 35 is discharged to the outside of the tank 20 through the outlet 22a.
- the concentration of acid gas in the mixed gas 30 gradually decreases from the inlet 21a of the first chamber 21 toward the outlet 21b.
- the mixed gas 30 (non-permeating fluid 36) processed in the first chamber 21 is discharged to the outside of the tank 20 through the outlet 21b.
- the membrane separation device 100 of this embodiment is suitable for a flow-type (continuous) membrane separation method.
- the membrane separation apparatus 100 of this embodiment may be used for a batch-type membrane separation method.
- the membrane separation device 110 of this embodiment includes a central tube 41 and a laminate 42 .
- a laminate 42 includes the separation membrane 10 .
- the membrane separation device 110 is a spiral membrane element.
- the central tube 41 has a cylindrical shape. A plurality of holes are formed on the surface of the central tube 41 to allow the permeating fluid 35 to flow into the central tube 41 .
- materials for the central tube 41 include resins such as acrylonitrile-butadiene-styrene copolymer resin (ABS resin), polyphenylene ether resin (PPE resin), and polysulfone resin (PSF resin); and metals such as stainless steel and titanium. be done.
- the inner diameter of the central tube 41 is, for example, in the range of 20-100 mm.
- the laminate 42 further includes, in addition to the separation membrane 10, a feed-side channel material 43 and a permeate-side channel material 44.
- the laminate 42 is wound around the central tube 41 .
- the membrane separation device 110 may further include an exterior material (not shown).
- a resin net made of polyphenylene sulfide (PPS) or ethylene-chlorotrifluoroethylene copolymer (ECTFE) can be used.
- Membrane separation using the membrane separation device 110 is performed, for example, by the following method.
- the permeated fluid 35 that permeates the separation membrane 10 of the laminate 42 moves inside the central tube 41 .
- the permeating fluid 35 is discharged outside through the central tube 41 .
- the mixed gas 30 (non-permeating fluid 36) processed by the membrane separation device 110 is discharged outside from the other end of the wound laminate 42. As shown in FIG. Thereby, the acid gas can be separated from the mixed gas 30 .
- Example 1 First, 1.6 g of an aqueous emulsion containing a silicone-based polymer (POLON-MF-56 manufactured by Shin-Etsu Chemical Co., Ltd.) and an aqueous emulsion containing a urethane-based polymer as a hydrophilic polymer (NeoRez R-2170 manufactured by DSM Coating Resins) 0 .2 g and 33.3 g of ion-exchanged water for dilution were mixed to prepare 35.0 g of an emulsion resin composition having a solid concentration of 2 wt %.
- a silicone-based polymer POLON-MF-56 manufactured by Shin-Etsu Chemical Co., Ltd.
- an aqueous emulsion containing a urethane-based polymer as a hydrophilic polymer NaoRez R-2170 manufactured by DSM Coating Resins
- an applicator (gap: 50 ⁇ m) was used to apply the prepared emulsion resin composition onto a porous support to obtain a coating film.
- a porous support a UF membrane (ultrafiltration membrane) RS-50 (a laminate of a PVDF porous layer and a PET nonwoven fabric) manufactured by Nitto Denko was used.
- the coating film was formed on the PVDF porous layer of RS-50.
- An intermediate layer having a thickness of 1 ⁇ m was formed by drying the obtained coating film at 130° C. for 10 minutes.
- the content of the silicone-based polymer was 90 parts by weight, and the content of the urethane-based polymer was 10 parts by weight.
- a polyether block amide resin (Pebax MH1657 manufactured by Arkema) was added to a mixture of 24.0 g of isopropanol and 10.3 g of water, and stirred at 80°C for 3 hours to obtain a 2 wt% polyether block amide resin.
- a coating solution of 35.0 g containing the polyether block amide resin was prepared.
- the coating liquid contained 0.01 g of a leveling agent (KP-112 manufactured by Shin-Etsu Chemical Co., Ltd.).
- An applicator (gap: 50 ⁇ m) was used to apply the prepared coating liquid onto the intermediate layer to obtain a coating film.
- the separated functional layer was formed by drying the obtained coating film in an oven at 60° C. for 30 minutes. Thus, a separation membrane of Example 1 was obtained.
- Example 2 to 22 Separation membranes of Examples 2 to 22 were obtained in the same manner as in Example 1, except that the type of hydrophilic polymer and the content of the polymer in the intermediate layer were changed as shown in Tables 1 and 2.
- Example 23 The emulsion resin composition did not contain a hydrophilic polymer, the content of the silicone polymer in the intermediate layer was changed to 100 parts by weight, and before forming the separation functional layer, the surface of the intermediate layer A separation membrane of Example 23 was obtained in the same manner as in Example 1, except that corona treatment was performed.
- Reference example 1 A laminate of Reference Example 1 was obtained in the same manner as in Example 23, except that the surface of the intermediate layer was not subjected to corona treatment and that no separation functional layer was formed.
- Comparative example 1 instead of the emulsion resin composition, a solution containing a silicone polymer (YSR-3022 manufactured by Momentive Performance Materials) was used, and the content of the silicone polymer in the intermediate layer was changed to 88 parts by weight. A separation membrane of Comparative Example 1 was obtained in the same manner as in Example 23, except that The solution containing the silicone-based polymer further contained a curing catalyst and a curing retarder, and the curing reaction of the silicone-based polymer proceeded when the intermediate layer was produced.
- a silicone polymer YSR-3022 manufactured by Momentive Performance Materials
- Reference example 2 A laminate of Reference Example 2 was obtained in the same manner as in Comparative Example 1, except that the surface of the intermediate layer was not subjected to corona treatment and that no separation functional layer was formed.
- Example 24 First, 0.7 g of an aqueous emulsion containing a silicone polymer (POLON-MF-56 manufactured by Shin-Etsu Chemical Co., Ltd.), 1.2 g of a water slurry containing a filler, and 18.1 g of ion-exchanged water for dilution were mixed. , 20.0 g of an emulsion resin composition having a solid content concentration of 2 wt % was prepared. As the water slurry containing the filler, a zeolite water slurry (Zeoal 4A 50 nm water slurry manufactured by Nakamura Choukou Co., Ltd.) was used.
- a zeolite water slurry Zeoal 4A 50 nm water slurry manufactured by Nakamura Choukou Co., Ltd.
- an applicator (gap: 100 ⁇ m) was used to apply the prepared emulsion resin composition onto a porous support to obtain a coating film.
- a porous support a UF membrane (ultrafiltration membrane) RS-50 (a laminate of a PVDF porous layer and a PET nonwoven fabric) manufactured by Nitto Denko was used.
- the coating film was formed on the PVDF porous layer of RS-50.
- An intermediate layer having a thickness of 2 ⁇ m was formed by drying the obtained coating film at 130° C. for 10 minutes.
- the content of the silicone-based polymer was 70 parts by weight, and the content of the filler was 30 parts by weight.
- a polyether block amide resin (Pebax MH1657 manufactured by Arkema) was added to a mixture of 24.0 g of isopropanol and 10.3 g of water, and stirred at 80°C for 3 hours to obtain a 2 wt% polyether block amide resin.
- a coating solution of 35.0 g containing the polyether block amide resin was prepared.
- the coating liquid contained 0.01 g of a leveling agent (KP-112 manufactured by Shin-Etsu Chemical Co., Ltd.).
- An applicator (gap: 50 ⁇ m) was used to apply the prepared coating liquid onto the intermediate layer to obtain a coating film.
- the separated functional layer was formed by drying the obtained coating film in an oven at 60° C. for 30 minutes. Thus, a separation membrane of Example 24 was obtained.
- Examples 25-26 Separation membranes of Examples 25 and 26 were obtained in the same manner as in Example 24, except that the type of filler and the content of polymer and filler in the intermediate layer were changed as shown in Table 4.
- Example 27 Water was added to the surfactant to dilute it 100 times. BYK-347 manufactured by BYK-Chemie Japan was used as the surfactant. Next, 800 g of the obtained diluted solution, 400 g of an aqueous emulsion containing a silicone polymer (POLON-MF-56 manufactured by Shin-Etsu Chemical Co., Ltd.), and 900 g of ion-exchanged water for dilution were mixed, and the solid content concentration was 8 wt. % emulsion resin composition was prepared. Next, using a gravure coater (gap: 5 ⁇ m), the prepared emulsion resin composition was applied onto a porous support to obtain a coating film.
- a gravure coater gap: 5 ⁇ m
- Example 27 Although the emulsion resin composition had a relatively low solid content concentration of 8 wt %, repelling of the emulsion resin composition on the metal roll was not observed.
- the thickness of the coating film was 5 ⁇ m.
- As the porous support a UF membrane (ultrafiltration membrane) RS-50 (a laminate of a PVDF porous layer and a PET nonwoven fabric) manufactured by Nitto Denko was used. The coating film was formed on the PVDF porous layer of RS-50.
- An intermediate layer having a thickness of 0.5 ⁇ m was formed by drying the obtained coating film at 130° C. for 2.5 minutes. In the intermediate layer, the content of the silicone polymer was 100 parts by weight, and the content of the surfactant was 5 parts by weight.
- polyether block amide resin (Pebax MH1657 manufactured by Arkema) was added to a mixed solution of 129 g of isopropanol and 441 g of water, and stirred at 80°C for 3 hours to obtain polyether block amide at a concentration of 2 wt%.
- 1500 g of coating liquid containing resin was prepared.
- the coating liquid contained 0.3 g of a leveling agent (KP-112 manufactured by Shin-Etsu Chemical Co., Ltd.).
- An applicator (gap: 50 ⁇ m) was used to apply the prepared coating liquid onto the intermediate layer to obtain a coating film.
- the separated functional layer was formed by drying the obtained coating film in an oven at 80° C. for 2.5 minutes. Thus, a separation membrane of Example 27 was obtained.
- Reference example 3 The same method as in Example 23, except that the gap of the applicator when forming the intermediate layer was set to 100 ⁇ m, the surface of the intermediate layer was not subjected to corona treatment, and the separation functional layer was not formed. Thus, a laminate of Reference Example 3 was obtained.
- the separation performance of the intermediate layer was evaluated by the following method. First, the laminate of the intermediate layer and the porous support obtained before forming the separation functional layer was cut to prepare three test pieces. For each of the test pieces, the carbon dioxide separation factor ⁇ 2 with respect to nitrogen (CO 2 /N 2 ) and the carbon dioxide permeation rate T2 were measured. Specifically, the test piece was set in a metal cell and sealed with an O-ring to prevent leaks. Next, the mixed gas was injected into the metal cell so that the mixed gas was in contact with the main surface of the test piece on the intermediate layer side. The gas mixture consisted essentially of carbon dioxide and nitrogen.
- the concentration of carbon dioxide in the mixed gas was 50 vol% under standard conditions.
- the gas mixture injected into the metal cell had a temperature of 30° C. and a pressure of 0.1 MPa.
- the space in the metal cell adjacent to the main surface of the test piece on the side of the porous support was evacuated with a vacuum pump. At this time, the space was decompressed so that the pressure in the space was 0.1 MPa lower than the atmospheric pressure in the measurement environment. This gave a permeate fluid. Based on the obtained composition of the permeated fluid, the weight of the permeated fluid, and the like, the separation coefficient ⁇ 2 of the test piece and the carbon dioxide permeation rate T2 were calculated.
- the coefficient of variation of the separation factor ⁇ 2 and the coefficient of variation of the permeation rate T2 were specified based on the separation factor ⁇ 2 and the permeation rate T2 for all test pieces.
- the variation coefficient of the separation factor ⁇ 2 and the variation coefficient of the permeation rate T2 in the intermediate layer were all 0.20 or less.
- the coefficient of variation of the separation factor ⁇ 2 and the coefficient of variation of the permeation rate T2 in the intermediate layer were 0.50 or more, greatly exceeding 0.20.
- Tables 1 to 4 show the average values of the obtained separation factor ⁇ 2 and the average values of the permeation rate T2.
- Tables 1 to 4 Abbreviations in Tables 1 to 4 are as follows.
- MF-56 POLON-MF-56 manufactured by Shin-Etsu Chemical Co., Ltd.
- YSR-3022 YSR-3022 manufactured by Momentive Performance Materials
- R-2170 NeoRez R-2170 manufactured by DSM Coating Resins DA200: Arakote DA200 manufactured by Arakawa Chemical Industries, Ltd.
- SF470 Superflex 470 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.
- WLS213 Hydran WLS213 manufactured by DIC SF420: Super Flex 420 manufactured by Daiichi Kogyo Seiyaku Co., Ltd.
- AP4690N Polysol AP4690N manufactured by Showa Denko Co., Ltd.
- WHW-822 Ceranate WHW-822 manufactured by DIC KT-8803: Elitel KT-8803 manufactured by Unitika EVA P-3N: Polysol EVA P-3N manufactured by Showa Denko Co., Ltd.
- 4A Zeoal 4A 50 nm water slurry manufactured by Nakamura Choukou Co., Ltd. (solid content concentration 10 wt%, average particle size 50 nm, average pore size 0.4 nm, density about 2 g/cm 3 )
- ZSM-5 Zeoal ZSM-5 water slurry manufactured by Nakamura Choukou Co., Ltd.
- AEROSILOX50 AEROSILOX50 manufactured by Nippon Aerosil Co., Ltd.
- BYK-349 BYK-349 manufactured by BYK-Chemie Japan
- the coefficient of variation of the separation factor ⁇ 2 and the coefficient of variation of the permeation rate T2 in the intermediate layer were smaller than those of Comparative Example 1, and were 0.20 or less.
- the coefficient of variation of the separation factor ⁇ 1 and the coefficient of variation of the permeation rate T1 in the separation membrane are also compared. It tended to be smaller than Example 1. From the results in Table 5, it can be inferred that the separation membranes of other Examples also have less variation in separation performance than Comparative Example 1.
- the middle layer containing the filler tended to have a higher carbon dioxide permeation rate T2 than that of Reference Example 3.
- the separation membrane of the present embodiment is suitable for separating acidic gases from mixed gases containing acidic gases.
- the separation membrane of this embodiment is suitable for separating carbon dioxide from off-gases of chemical plants or thermal power plants.
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Abstract
Description
分離機能層と、
前記分離機能層を支持している多孔性支持体と、
前記分離機能層と前記多孔性支持体との間に配置され、エマルション樹脂組成物から形成された中間層と、
を備えた、分離膜を提供する。
分離機能層と、前記分離機能層を支持している多孔性支持体と、前記分離機能層と前記多孔性支持体との間に配置された中間層と、を備えた分離膜の製造方法であって、
前記製造方法は、
前記多孔性支持体の上にエマルション樹脂組成物を塗布し、塗布膜を形成することと、
前記塗布膜を乾燥させて、前記中間層を形成することと、
を含む、分離膜の製造方法を提供する。
分離機能層と、
前記分離機能層を支持している多孔性支持体と、
前記分離機能層と前記多孔性支持体との間に配置され、シリコーン系ポリマー及び親水性ポリマーを含む中間層と、
を備えた、分離膜を提供する。
図1に示すように、本実施形態の分離膜10は、分離機能層1、中間層2及び多孔性支持体3を備えている。中間層2は、分離機能層1と多孔性支持体3との間に配置されており、分離機能層1及び多孔性支持体3のそれぞれに直接接している。中間層2は、エマルション樹脂組成物から形成されている。
分離機能層1は、例えば、混合気体に含まれる酸性ガスを優先的に透過させることができる層である。好ましい一形態では、分離機能層1は、樹脂を含む。分離機能層1に含まれる樹脂としては、例えば、ポリエーテルブロックアミド樹脂、ポリアミド樹脂、ポリエーテル樹脂、ポリイミド樹脂、酢酸セルロース樹脂、シリコーン樹脂及びフッ素樹脂が挙げられる。分離機能層1は、好ましくはポリエーテルブロックアミド樹脂を含む。この形態において、分離機能層1は、好ましくは、実質的に樹脂からなる。本明細書において、「実質的に~からなる」は、言及された材料の本質的特徴を変更する他の成分を排除することを意味し、例えば95wt%以上、さらには99wt%以上が当該材料により構成されていることを意味する。ただし、分離機能層1は、樹脂以外に、レベリング剤などの添加剤をさらに含んでいてもよい。
上述のとおり、本実施形態において、中間層2は、エマルション樹脂組成物から形成されている。エマルション樹脂組成物は、分散媒と、分散媒中で乳化したポリマーとを含む液体を意味する。エマルション樹脂組成物は、分散媒として水を含むことが好ましい。すなわち、エマルション樹脂組成物は、水中油滴型(O/W型)のエマルションであることが好ましい。エマルション樹脂組成物は、分散媒として、水に代えて、又は水とともに、有機溶媒を含んでいてもよい。エマルション樹脂組成物に含まれる有機溶媒としては、2-エチルヘキサノール、ブチルセルソルブ、ジプロピレングリコール、エチレングリコール、プロピレングリコール、ノルマルプロピルアルコール、イソプロパノールなどが挙げられ、エマルション樹脂組成物中でのポリマーの分散性の観点から、エチレングリコール、プロピレングリコールが好ましい。
分離機能層1と、
分離機能層1を支持している多孔性支持体3と、
分離機能層1と多孔性支持体3との間に配置され、シリコーン系ポリマー及び親水性ポリマーを含む中間層2と、
を備えた、分離膜10を提供する。
多孔性支持体3は、中間層2を介して分離機能層1を支持する。多孔性支持体3としては、例えば、不織布;多孔質ポリテトラフルオロエチレン;芳香族ポリアミド繊維;多孔質金属;焼結金属;多孔質セラミック;多孔質ポリエステル;多孔質ナイロン;活性化炭素繊維;ラテックス;シリコーン;シリコーンゴム;ポリフッ化ビニル、ポリフッ化ビニリデン、ポリウレタン、ポリプロピレン、ポリエチレン、ポリカーボネート、ポリスルホン、ポリエーテルエーテルケトン、ポリアクリロニトリル、ポリイミド及びポリフェニレンオキシドからなる群より選ばれる少なくとも1つを含む透過性(多孔質)ポリマー;連続気泡又は独立気泡を有する金属発泡体;連続気泡又は独立気泡を有するポリマー発泡体;シリカ;多孔質ガラス;メッシュスクリーンなどが挙げられる。多孔性支持体3は、これらのうちの2種以上を組み合わせたものであってもよい。多孔性支持体3は、ポリフッ化ビニリデン(PVDF)を含むことが好ましい。
本実施形態の分離膜10の製造方法は、例えば、多孔性支持体3の上にエマルション樹脂組成物を塗布し、塗布膜を形成することと、当該塗布膜を乾燥させて、中間層2を形成することと、を含む。エマルション樹脂組成物を調製する方法は、特に限定されない。一例として、シリコーン系ポリマー及び/又は親水性ポリマーを含むエマルションに、界面活性剤、フィラーなどを添加することによってエマルション樹脂組成物を調製してもよい。エマルションには、フィラー及び分散媒(例えば水)を含むスラリーが添加されてもよい。フィラーを含むスラリーをエマルションに添加した場合、得られたエマルション樹脂組成物において、フィラーの凝集が抑制される傾向がある。フィラーの凝集が抑制されたエマルション樹脂組成物によれば、中間層2を作製するときに、欠陥の発生を抑制することができる。フィラーを含むスラリーをエマルションに添加する方法によれば、中間層2におけるフィラーの含有率を容易に増加させることもできる。
上述のとおり、本実施形態の分離膜10において、中間層2は、エマルション樹脂組成物から形成されている。本発明者らの検討によると、多孔性支持体3の上にエマルション樹脂組成物を塗布しても、エマルション樹脂組成物に含まれるポリマーが多孔性支持体3の内部に浸み込みにくい。特に、エマルション樹脂組成物が分散媒として水を含み、かつ多孔性支持体3の表面の水に対する接触角が大きい場合に、多孔性支持体3の内部へのポリマーの浸み込みが顕著に抑制される。多孔性支持体3の内部へのポリマーの浸み込みが抑制されるため、形成された中間層2では、厚さのばらつきとともに、ピンホールなどの欠陥の発生が抑制されている。例えば、エマルション樹脂組成物によれば、厚さのばらつきを抑制しつつ、厚さが比較的小さい中間層2を容易に作製することができる。本実施形態では、エマルション樹脂組成物から形成された中間層2の上に分離機能層1が形成されることによって、分離膜10における分離性能のばらつきが抑制される傾向がある。
分離係数α1=(YA/YB)/(XA/XB)
図2に示すとおり、本実施形態の膜分離装置100は、分離膜10及びタンク20を備えている。タンク20は、第1室21及び第2室22を備えている。分離膜10は、タンク20の内部に配置されている。タンク20の内部において、分離膜10は、第1室21と第2室22とを隔てている。分離膜10は、タンク20の1対の壁面の一方から他方まで延びている。
図3に示すとおり、本実施形態の膜分離装置110は、中心管41及び積層体42を備えている。積層体42が分離膜10を含んでいる。膜分離装置110は、スパイラル型の膜エレメントである。
まず、シリコーン系ポリマーを含む水系エマルション(信越化学工業製のPOLON-MF-56)1.6gと、親水性ポリマーとしてウレタン系ポリマーを含む水系エマルション(DSM Coating Resins社製のNeoRez R-2170)0.2gと、希釈のためのイオン交換水33.3gとを混合し、固形分濃度2wt%のエマルション樹脂組成物35.0gを作製した。次に、アプリケーター(ギャップ:50μm)を用いて、作製したエマルション樹脂組成物を多孔性支持体の上に塗布することによって塗布膜を得た。多孔性支持体としては、日東電工社製のUF膜(限外ろ過膜)RS-50(PVDF多孔質層とPET不織布との積層体)を用いた。塗布膜は、RS-50のPVDF多孔質層の上に形成した。得られた塗布膜を130℃で10分乾燥させることによって、厚さ1μmの中間層を形成した。中間層において、シリコーン系ポリマーの含有量が90重量部であり、ウレタン系ポリマーの含有量が10重量部であった。
親水性ポリマーの種類、及び、中間層におけるポリマーの含有量を表1~2に示すように変更したことを除き、実施例1と同じ方法によって実施例2~22の分離膜を得た。
エマルション樹脂組成物が親水性ポリマーを含んでいなかったこと、中間層におけるシリコーン系ポリマーの含有量を100重量部に変更したこと、及び、分離機能層を形成する前に、中間層の表面についてコロナ処理を行ったことを除き、実施例1と同じ方法によって実施例23の分離膜を得た。
中間層の表面についてコロナ処理を行わなかったこと、及び、分離機能層を形成しなかったことを除き、実施例23と同じ方法によって参考例1の積層体を得た。
エマルション樹脂組成物に代えて、シリコーン系ポリマーを含む溶液(モメンティブ・パーフォーマンス・マテリアルズ社製のYSR-3022)を用いたこと、中間層におけるシリコーン系ポリマーの含有量を88重量部に変更したことを除き、実施例23と同じ方法によって比較例1の分離膜を得た。なお、シリコーン系ポリマーを含む溶液は、硬化触媒及び硬化遅延剤をさらに含んでおり、中間層を作製するときにシリコーン系ポリマーの硬化反応が進行した。
中間層の表面についてコロナ処理を行わなかったこと、及び、分離機能層を形成しなかったことを除き、比較例1と同じ方法によって参考例2の積層体を得た。
まず、シリコーン系ポリマーを含む水系エマルション(信越化学工業製のPOLON-MF-56)0.7gと、フィラーを含む水スラリー1.2gと、希釈のためのイオン交換水18.1gとを混合し、固形分濃度2wt%のエマルション樹脂組成物20.0gを作製した。フィラーを含む水スラリーとしては、ゼオライトの水スラリー(中村超硬社製のZeoal 4A 50nm 水スラリー)を用いた。次に、アプリケーター(ギャップ:100μm)を用いて、作製したエマルション樹脂組成物を多孔性支持体の上に塗布することによって塗布膜を得た。多孔性支持体としては、日東電工社製のUF膜(限外ろ過膜)RS-50(PVDF多孔質層とPET不織布との積層体)を用いた。塗布膜は、RS-50のPVDF多孔質層の上に形成した。得られた塗布膜を130℃で10分乾燥させることによって、厚さ2μmの中間層を形成した。中間層において、シリコーン系ポリマーの含有量が70重量部であり、フィラーの含有量が30重量部であった。
フィラーの種類、並びに、中間層におけるポリマー及びフィラーの含有量を表4に示すように変更したことを除き、実施例24と同じ方法によって実施例25~26の分離膜を得た。
まず、界面活性剤に水を加えて、100倍に希釈した。界面活性剤としては、ビックケミー・ジャパン社製のBYK-347を用いた。次に、得られた希釈液800gと、シリコーン系ポリマーを含む水系エマルション(信越化学工業製のPOLON-MF-56)400gと、希釈のためのイオン交換水900gとを混合し、固形分濃度8wt%のエマルション樹脂組成物2100gを作製した。次に、グラビアコーター(ギャップ:5μm)を用いて、作製したエマルション樹脂組成物を多孔性支持体の上に塗布することによって塗布膜を得た。なお、グラビアコーターを用いる場合、予め、エマルション樹脂組成物を金属ロールになじませる必要がある。実施例27では、エマルション樹脂組成物における固形分濃度が8wt%と比較的低い値であるにも関わらず、金属ロール上でのエマルション樹脂組成物のハジキが確認されなかった。塗布膜の厚さ(塗工厚み)は、5μmであった。多孔性支持体としては、日東電工社製のUF膜(限外ろ過膜)RS-50(PVDF多孔質層とPET不織布との積層体)を用いた。塗布膜は、RS-50のPVDF多孔質層の上に形成した。得られた塗布膜を130℃で2.5分乾燥させることによって、厚さ0.5μmの中間層を形成した。中間層において、シリコーン系ポリマーの含有量が100重量部であり、界面活性剤の含有量が5重量部であった。
中間層を形成するときのアプリケーターのギャップを100μmに設定したこと、中間層の表面についてコロナ処理を行わなかったこと、及び、分離機能層を形成しなかったことを除き、実施例23と同じ方法によって参考例3の積層体を得た。
実施例、比較例及び参考例について、次の方法によって中間層の分離性能の評価を行った。まず、分離機能層を形成する前の段階で得られた中間層及び多孔性支持体の積層体を切断し、3個の試験片を準備した。試験片のそれぞれについて、窒素に対する二酸化炭素の分離係数α2(CO2/N2)、及び二酸化炭素の透過速度T2を測定した。詳細には、試験片を金属セル中にセットし、リークが発生しないようにOリングでシールした。次に、試験片の中間層側の主面に混合気体が接触するように、金属セル内に混合気体を注入した。混合気体は、実質的に二酸化炭素及び窒素からなっていた。混合気体における二酸化炭素の濃度は、標準状態で50vol%であった。金属セル内に注入された混合気体は、温度が30℃であり、圧力が0.1MPaであった。次に、試験片の多孔性支持体側の主面に隣接する金属セル内の空間を真空ポンプで減圧した。このとき、この空間は、空間内の圧力が測定環境における大気圧に対して0.1MPa小さくなるように減圧されていた。これにより、透過流体が得られた。得られた透過流体の組成、透過流体の重量などに基づいて、試験片の分離係数α2及び二酸化炭素の透過速度T2を算出した。さらに、全ての試験片における分離係数α2及び透過速度T2に基づいて、分離係数α2の変動係数及び透過速度T2の変動係数を特定した。実施例1~27、参考例1及び3では、いずれも、中間層における分離係数α2の変動係数及び透過速度T2の変動係数が0.20以下であった。一方、比較例1及び参考例2では、いずれも、中間層における分離係数α2の変動係数及び透過速度T2の変動係数が、0.20を大きく上回り、0.50以上であった。表1~4には、得られた分離係数α2の平均値及び透過速度T2の平均値を示す。
実施例1、4、24~27及び比較例1については、分離膜の分離性能の評価も行った。分離膜の分離性能の評価は、中間層及び多孔性支持体の積層体に代えて分離膜を用いたことを除き、中間層の分離性能の評価と同じ方法によって行った。これにより、分離膜を切断することによって準備した3個の試験片について、窒素に対する二酸化炭素の分離係数α1(CO2/N2)、及び二酸化炭素の透過速度T1を測定した。表5には、得られた分離係数α1及び透過速度T1について、平均値及び変動係数を示す。なお、表5には、実施例1、4、24~27、比較例1及び参考例2について、中間層における分離係数α2及び透過速度T2の平均値及び変動係数も示す。
実施例1~23、比較例1及び参考例1~2について、上述の方法によって中間層の表面の水に対する接触角を測定した。測定には、分離機能層を形成する前の段階で得られた中間層及び多孔性支持体の積層体を利用した。結果を表1~3に示す。
実施例1~23、比較例1及び参考例1~2について、上述の方法によって多孔性支持体に対する中間層の剥離力P1を測定した。測定には、分離機能層を形成する前の段階で得られた中間層及び多孔性支持体の積層体を利用した。結果を表1~3に示す。
実施例1~23及び比較例1の分離膜について、上述の方法によって中間層に対する分離機能層の剥離力P2を測定した。結果を表1~3に示す。
比較例1については、分離機能層を形成する前の段階で、中間層の表面を電子顕微鏡で観察した。結果を図4Aに示す。図4Aからわかるとおり、比較例1では、中間層の表面に欠陥(ピンホール)が生じていた。
MF-56:信越化学工業製のPOLON-MF-56
YSR-3022:モメンティブ・パーフォーマンス・マテリアルズ社製のYSR-3022
R-2170:DSM Coating Resins社製のNeoRez R-2170
DA200:荒川化学工業社製のアラコートDA200
SF470:第一工業製薬社製のスーパーフレックス470
WLS213:DIC社製のハイドランWLS213
SF420:第一工業製薬社製のスーパーフレックス420
AP4690N:昭和電工社製のポリゾールAP4690N
WHW-822:DIC社製のセラネートWHW-822
KT-8803:ユニチカ社製のエリーテルKT-8803
EVA P-3N:昭和電工社製のポリゾールEVA P-3N
4A:中村超硬社製のZeoal 4A 50nm 水スラリー(固形分濃度10wt%、平均粒子径50nm、平均細孔径0.4nm、密度約2g/cm3)
ZSM-5:中村超硬社製のZeoal ZSM-5 水スラリー(固形分濃度30wt%、平均粒子径100nm、平均細孔径0.54~0.56nm、密度約2g/cm3)
AEROSILOX50:日本アエロジル社製のAEROSILOX50
BYK-349:ビックケミー・ジャパン社製のBYK-349
Claims (17)
- 分離機能層と、
前記分離機能層を支持している多孔性支持体と、
前記分離機能層と前記多孔性支持体との間に配置され、エマルション樹脂組成物から形成された中間層と、
を備えた、分離膜。 - 前記中間層は、シリコーン系ポリマーを含む、請求項1に記載の分離膜。
- 前記中間層は、親水性ポリマーを含む、請求項1又は2に記載の分離膜。
- 前記親水性ポリマーは、ウレタン系ポリマー、(メタ)アクリル系ポリマー、(メタ)アクリルウレタン系ポリマー、エステル系ポリマー及びビニルエステル系ポリマーからなる群より選ばれる少なくとも1つを含む、請求項3に記載の分離膜。
- 前記中間層における前記親水性ポリマーの含有率が10wt%~20wt%である、請求項3又は4に記載の分離膜。
- 前記エマルション樹脂組成物は、分散媒として水を含む、請求項1~5のいずれか1項に記載の分離膜。
- 前記エマルション樹脂組成物は、界面活性剤を含む、請求項1~6のいずれか1項に記載の分離膜。
- 前記エマルション樹脂組成物において、全ての固形分の重量に対する前記界面活性剤の重量の比率が15wt%以下である、請求項7に記載の分離膜。
- 前記中間層は、フィラーを含む、請求項1~8のいずれか1項に記載の分離膜。
- 前記フィラーは、粒子の形状を有し、かつ、平均粒子径が前記中間層の厚さよりも小さい、請求項9に記載の分離膜。
- 前記分離機能層は、ポリエーテルブロックアミド樹脂を含む、請求項1~10のいずれか1項に記載の分離膜。
- 前記多孔性支持体がポリフッ化ビニリデンを含む、請求項1~11のいずれか1項に記載の分離膜。
- 前記中間層の厚さが10μm以下である、請求項1~12のいずれか1項に記載の分離膜。
- 前記中間層に対する前記分離機能層の剥離力が3.0N/10mm以上である、請求項1~13のいずれか1項に記載の分離膜。
- 二酸化炭素及び窒素を含む混合気体から二酸化炭素を分離するために用いられる、請求項1~14のいずれか1項に記載の分離膜。
- 分離機能層と、前記分離機能層を支持している多孔性支持体と、前記分離機能層と前記多孔性支持体との間に配置された中間層と、を備えた分離膜の製造方法であって、
前記製造方法は、
前記多孔性支持体の上にエマルション樹脂組成物を塗布し、塗布膜を形成することと、
前記塗布膜を乾燥させて、前記中間層を形成することと、
を含む、分離膜の製造方法。 - 分離機能層と、
前記分離機能層を支持している多孔性支持体と、
前記分離機能層と前記多孔性支持体との間に配置され、シリコーン系ポリマー及び親水性ポリマーを含む中間層と、
を備えた、分離膜。
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