WO2012165455A1 - 気体分離膜 - Google Patents
気体分離膜 Download PDFInfo
- Publication number
- WO2012165455A1 WO2012165455A1 PCT/JP2012/063861 JP2012063861W WO2012165455A1 WO 2012165455 A1 WO2012165455 A1 WO 2012165455A1 JP 2012063861 W JP2012063861 W JP 2012063861W WO 2012165455 A1 WO2012165455 A1 WO 2012165455A1
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- WIPO (PCT)
- Prior art keywords
- group
- gas separation
- separation membrane
- formula
- organic group
- Prior art date
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- 238000000926 separation method Methods 0.000 title claims abstract description 146
- 239000012528 membrane Substances 0.000 title claims abstract description 145
- 229920001721 polyimide Polymers 0.000 claims abstract description 147
- 239000004642 Polyimide Substances 0.000 claims abstract description 145
- 125000000962 organic group Chemical group 0.000 claims abstract description 83
- -1 hexafluoroisopropylidene Chemical group 0.000 claims abstract description 36
- 239000007789 gas Substances 0.000 claims description 139
- 125000004435 hydrogen atom Chemical group [H]* 0.000 claims description 31
- 150000001875 compounds Chemical class 0.000 claims description 23
- 229910052731 fluorine Inorganic materials 0.000 claims description 16
- 125000004432 carbon atom Chemical group C* 0.000 claims description 15
- 125000004430 oxygen atom Chemical group O* 0.000 claims description 15
- 229910052717 sulfur Inorganic materials 0.000 claims description 15
- 239000004593 Epoxy Substances 0.000 claims description 14
- 125000001309 chloro group Chemical group Cl* 0.000 claims description 14
- 125000004434 sulfur atom Chemical group 0.000 claims description 14
- 229910052757 nitrogen Inorganic materials 0.000 claims description 13
- 125000000217 alkyl group Chemical group 0.000 claims description 12
- 125000001153 fluoro group Chemical group F* 0.000 claims description 12
- 125000004433 nitrogen atom Chemical group N* 0.000 claims description 11
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 9
- NAWXUBYGYWOOIX-SFHVURJKSA-N (2s)-2-[[4-[2-(2,4-diaminoquinazolin-6-yl)ethyl]benzoyl]amino]-4-methylidenepentanedioic acid Chemical compound C1=CC2=NC(N)=NC(N)=C2C=C1CCC1=CC=C(C(=O)N[C@@H](CC(=C)C(O)=O)C(O)=O)C=C1 NAWXUBYGYWOOIX-SFHVURJKSA-N 0.000 claims description 8
- 125000003709 fluoroalkyl group Chemical group 0.000 claims description 8
- 229910052801 chlorine Inorganic materials 0.000 claims description 7
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 claims description 7
- 125000002723 alicyclic group Chemical group 0.000 claims description 6
- 125000003118 aryl group Chemical group 0.000 claims description 6
- 125000001246 bromo group Chemical group Br* 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 6
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 claims description 6
- 125000004093 cyano group Chemical group *C#N 0.000 claims description 6
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- 125000000449 nitro group Chemical group [O-][N+](*)=O 0.000 claims description 6
- 125000001424 substituent group Chemical group 0.000 claims description 6
- 150000004945 aromatic hydrocarbons Chemical class 0.000 claims description 5
- 150000001335 aliphatic alkanes Chemical group 0.000 claims description 4
- 125000003545 alkoxy group Chemical group 0.000 claims description 4
- 125000003055 glycidyl group Chemical group C(C1CO1)* 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 125000002023 trifluoromethyl group Chemical group FC(F)(F)* 0.000 claims description 4
- 125000006267 biphenyl group Chemical group 0.000 claims description 3
- 125000004185 ester group Chemical group 0.000 claims description 3
- 125000005677 ethinylene group Chemical group [*:2]C#C[*:1] 0.000 claims description 3
- 125000001495 ethyl group Chemical group [H]C([H])([H])C([H])([H])* 0.000 claims description 3
- 125000005842 heteroatom Chemical group 0.000 claims description 3
- 125000002346 iodo group Chemical group I* 0.000 claims description 3
- 125000001449 isopropyl group Chemical group [H]C([H])([H])C([H])(*)C([H])([H])[H] 0.000 claims description 3
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 3
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- QPFMBZIOSGYJDE-UHFFFAOYSA-N 1,1,2,2-tetrachloroethane Chemical compound ClC(Cl)C(Cl)Cl QPFMBZIOSGYJDE-UHFFFAOYSA-N 0.000 description 4
- QTWJRLJHJPIABL-UHFFFAOYSA-N 2-methylphenol;3-methylphenol;4-methylphenol Chemical compound CC1=CC=C(O)C=C1.CC1=CC=CC(O)=C1.CC1=CC=CC=C1O QTWJRLJHJPIABL-UHFFFAOYSA-N 0.000 description 4
- HEDRZPFGACZZDS-UHFFFAOYSA-N Chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 4
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 description 4
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- NSGXIBWMJZWTPY-UHFFFAOYSA-N 1,1,1,3,3,3-hexafluoropropane Chemical compound FC(F)(F)CC(F)(F)F NSGXIBWMJZWTPY-UHFFFAOYSA-N 0.000 description 3
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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
- B01D2323/30—Cross-linking
Definitions
- the present invention relates to a gas separation membrane.
- Gas separation by a gas separation membrane has long been attracting attention as a simple technique that can continuously separate a mixed gas in a gaseous state and does not involve phase change.
- Gas separation is a technique for selectively separating gas by using the presence or absence of permeation and the difference in permeation speed depending on the type of gas (hereinafter sometimes referred to as gas) that permeates the gas separation membrane.
- polymers such as cellulose acetate, polysulfone or polyimide are known.
- polyimide is known as a material that has strength suitable for use as a gas separation membrane, is not easily damaged, has excellent heat resistance, and can be used at high temperatures.
- a polyimide-based gas separation membrane containing a hexafluoroisopropylidene group (—C (CF 3 ) 2 —) in a repeating structure is composed of helium (hereinafter sometimes referred to as He), carbon dioxide (hereinafter referred to as CO 2 ). High permeability of these gases (hereinafter sometimes referred to as O 2 ) and methane (hereinafter sometimes referred to as CH 4 ). It is known.
- Non-Patent Document 1 a hexafluoroisopropylidene group (—C (CF 3 ) 2 —) into the repeating unit in the polyimide in the gas separation membrane, the intermolecular interaction is weakened while improving the rigidity of the molecular chain, A difference in permeation of the gas separation membrane depending on the type of gas is caused, and both high membrane permeability and high selectivity can be achieved.
- a hexafluoroisopropylidene group —C (CF 3 ) 2 —
- Non-patent document 3 describes the separation performance of a mixed gas composed of He, CO 2 , O 2 and CH 4 of a polyimide membrane containing a hexafluoroisopropylidene group.
- Patent Documents 1 to 3 2-hydroxy-1,1,1,3,3,3-fluoroisopropyl group (—C (CF 3 ) 2 OH), (hereinafter, referred to as “polymerization of fluorine-containing polyimide”).
- polymerization of fluorine-containing polyimide A fluorine-containing polymerizable monomer that is a diamine having a HFIP group) and a method for producing the same are disclosed.
- a method for producing a gas separation membrane made of polyimide or the like includes a method in which a polyimide solution is wet-coated and then a solvent is simply evaporated to obtain a homogeneous membrane, and a heterogeneous asymmetric membrane consisting of a dense layer and a porous layer. There is a way to get it.
- a method of obtaining an asymmetric membrane is a method in which a polymer solution is discharged from a discharge port, a solvent existing in the vicinity of the surface is evaporated in the air to form a dense layer, and then a solvent that is compatible with the solvent of the polymer solution but does not dissolve the polymer.
- Patent Document 4 discloses a method for producing a composite reverse osmosis membrane by this method.
- the diamine and carboxylic dianhydride for polymerizing a polyimide containing a hexafluoroisopropylidene group are limited as described above, and the chemical structure is limited when forming a polyimide film.
- a gas separation membrane When a gas separation membrane is used, there is a problem that it is difficult to design a chemical structure considering workability, strength, and separation performance.
- An object of the present invention is to solve such problems, and to provide a gas separation membrane that dissolves in an organic solvent, has excellent moldability, and has excellent gas separation performance when used as a gas separation membrane.
- the present inventors can be soluble in an organic solvent, particularly a polar solvent, and improve the gas separation performance. It came to solve the said subject.
- the gas separation membrane of the present invention is a fluorine-containing polyimide gas separation membrane having an HFIP group.
- the present invention includes the following inventions 1 to 19.
- R 1 is represented by the general formula (2): (In formula (2), R 3 is a single bond, oxygen atom, sulfur atom, SO 2 , CH 2 , CO, C (CH 3 ) 2 , C (CH 3 ) (CH 2 CH 3 ), C (CF 3 ) 2 or a divalent organic group formed by removing two hydrogen atoms from an alicyclic hydrocarbon compound having 3 to 12 carbon atoms or an aromatic hydrocarbon compound having 6 to 25 carbon atoms, and m and p are Each independently represents an integer of 0 to 2, and 1 ⁇ m + p ⁇ 4.)
- the gas separation membrane of Claim 1 which is a bivalent organic group represented by these.
- the divalent organic group represented by the general formula (2) is Formula (3):
- the gas separation membrane of the invention 2 which is a bivalent organic group represented by these.
- the divalent organic group represented by the general formula (2) is Formula (4):
- the gas separation membrane of the invention 2 which is a bivalent organic group represented by these.
- the divalent organic group represented by the general formula (2) is Formula (5):
- the gas separation membrane of the invention 2 which is a bivalent organic group represented by these.
- the divalent organic group represented by the general formula (2) is General formula (6): (In formula (6), each R 4 independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxyl group, a carboxyl group, an ester group, a hydroxyl group, a nitro group, a cyano group, a chloro group, a bromo group, or a fluoroalkyl group. It is at least one monovalent organic group selected from the group consisting of groups)
- the gas separation membrane of the invention 2 which is a bivalent organic group represented by these.
- the divalent organic group represented by the general formula (2) is Formula (7): (In formula (7), Me represents a methyl group.)
- the gas separation membrane of the invention 6 which is a bivalent organic group represented by these.
- each R 5 is independently selected from the group consisting of a hydrogen atom, a methyl group, an ethyl group, an isopropyl group, a chloro group, a fluoro group, a trifluoromethyl group, a phenyl group, a methoxy group, and a nitro group.
- each R 6 independently represents a hydrogen atom, or a phenyl group, a naphthyl group, a biphenyl group, a sulfo group, an ethynylene structure-containing group, a bromo group, a chloro group, a fluoro group.
- at least one monovalent organic group selected from the group consisting of a group and an iodo group, g and h are each independently an integer of 0, 1, or 2, and g + h is 1 or more and 4 or less ).
- the gas separation membrane of the invention 2 which is a bivalent organic group represented by these.
- the divalent organic group represented by the general formula (8) is Formula (9):
- the gas separation membrane of the invention 8 which is a bivalent organic group represented by these.
- R 1 is the general formula (10): (In the formula (10), a and b are each independently an integer of 0 to 2 and a + b ⁇ 1. C is an integer of 0 or more and 3 or less. D and e are each independently 0 to 2. 1 ⁇ d + e ⁇ 4
- formula (10) the following formula: As for the site
- the gas separation membrane of the invention 1 which is the bivalent organic group represented by these.
- the divalent organic group represented by the general formula (10) is Formula (11):
- the gas separation membrane of the invention 10 which is a bivalent organic group represented by these.
- the divalent organic group represented by R 1 is represented by the general formula (12): (In formula (12), f is an integer of 1 or 2.)
- the gas separation membrane of the invention 1 which is the bivalent organic group represented by these.
- the tetravalent organic group represented by R 2 is Formula (15):
- invention 16 The gas according to any one of inventions 1 to 15, wherein the hydrogen atom of the OH group of 2-hydroxy-1,1,1,3,3,3-hexafluoroisopropyl group contained in R 1 is substituted with a glycidyl group Separation membrane.
- invention 18 The gas separation membrane according to any one of inventions 1 to 16, which is obtained by further mixing with an epoxy compound and heating.
- the epoxy compound has the general formula (16):
- R 7 is a monovalent organic group in which one hydrogen atom is removed from the alkane, aromatic ring and alicyclic ring, and may contain an oxygen atom, a sulfur atom or a nitrogen atom in the structure.
- a part of hydrogen atoms may be substituted with a fluorine atom, a chlorine atom, an alkyl group or a fluoroalkyl group, i is an integer of 1 to 4.
- the gas separation membrane of the invention 18 represented by these.
- the polyimide gas separation membrane containing the HFIP group of the present invention has a good separation performance by the HFIP group.
- Gas separation membranes containing hexafluoroisopropylidene groups in addition to HFIP groups exhibit even better gas separation performance.
- the HFIP group has a hydroxyl group, it is soluble in a specific organic solvent, particularly a polar solvent, and it is easy to prepare a polyimide solution, which can be formed into a desired film shape.
- polyimide gas separation membrane containing HFIP groups of the present invention since aromatic diamine as a raw material can contain HFIP groups (see Patent Documents 1 to 3), conventional fluorine-containing polyimides Compared to a gas separation membrane, in addition to gas separation performance, it is possible to design a structure for improving membrane physical properties such as membrane strength or resistance to swelling in a solvent.
- the monomer compound used as the raw material for the polyimide containing an HFIP group for producing the gas separation membrane of the present invention includes a diamine containing an HFIP group and tetracarboxylic dianhydride. It is preferable to use an aromatic diamine for the strength of the gas separation membrane. In addition to the aromatic diamine containing an HFIP group, other diamines are added to adjust the strength and separation performance of the membrane. May be. Similarly, in addition to tetracarboxylic dianhydride, other dicarboxylic acids and derivatives thereof may be added in order to adjust the strength and separation performance of the membrane.
- Aromatic diamine containing HFIP group An aromatic diamine containing an HFIP group as a monomer compound for synthesizing a polyimide containing an HFIP group for producing the gas separation membrane of the present invention is represented by the following general formula (2A). ) To (14A).
- R 3 is a single bond, oxygen atom, sulfur atom, SO 2 , CH 2 , CO, C (CH 3 ) 2 , C (CH 3 ) (CH 2 CH 3 ), C (CF 3 ) 2 is a divalent organic group formed by removing two hydrogen atoms from an alicyclic hydrocarbon compound having 3 to 12 carbon atoms or an aromatic hydrocarbon compound having 6 to 25 carbon atoms, and m and p are Each independently represents an integer of 0 to 2, and 1 ⁇ m + p ⁇ 4.
- the gas separation membrane of Claim 1 which is a bivalent organic group represented by these.
- the divalent organic group formed by removing two hydrogen atoms from an alicyclic hydrocarbon compound having 3 to 12 carbon atoms is a divalent group formed by removing two hydrogen atoms of cyclohexane, bicyclohexane, adamantane or norbornane.
- As the divalent organic group formed by removing two hydrogen atoms of an aromatic hydrocarbon compound having 6 to 25 carbon atoms two hydrogen atoms of benzene, biphenyl, naphthalene or fluorene are separated. And a divalent organic group.
- each R 4 independently represents an alkyl group having 1 to 10 carbon atoms, an alkoxyl group, a carboxyl group, an ester group, a hydroxyl group, a nitro group, a cyano group, a chloro group, a bromo group, or a fluoro group. It is at least one monovalent organic group selected from the group consisting of alkyl groups.
- each R 5 is independently a hydrogen atom or a methyl group, an ethyl group, an isopropyl group, a chloro group, a fluoro group, a trifluoromethyl group, a phenyl group, a methoxy group, and a nitro group.
- each R 6 is independently a hydrogen atom, a phenyl group, a naphthyl group, a biphenyl group, a sulfo group, an ethynylene structure-containing group, a bromo group, or a chloro group.
- At least one monovalent organic group selected from the group consisting of a fluoro group and an iodo group, g and h are each independently an integer of 0, 1, or 2, and g + h is 1 or more and 4 Below).
- the aromatic diamine containing the HFIP group represented by the general formula (2A) gives a repeating unit including the structural unit represented by the general formula (2).
- the diamines represented by the formulas (3A) to (14A) give repeating units including the structural units represented by the formulas (3) to (14), respectively.
- the diamine represented by the formula (11A), the formula (13A) or the formula (14A) is a raw material that is easy to synthesize and is easy to use in the polyimide gas separation membrane containing the HFIP group of the present invention.
- Two or more aromatic diamines containing these HFIP groups may be used in combination, and their production methods are described in Patent Documents 1 to 3.
- diamines in the gas separation membrane of the present invention, in order to adjust the membrane properties such as gas separation performance and membrane strength when used as a gas separation membrane, in the synthesis of polyimide containing HFIP groups, aromatic diamines containing HFIP groups In addition, other diamines such as dihydroxyamine may be used.
- the amount used is 10 mol% to 80 mol%, preferably 30 mol% to 60 mol%, based on the tetracarboxylic dianhydride.
- performances such as gas separation performance, solubility in polar solvents, and membrane strength can be adjusted.
- diamine examples include 3,5-diaminobenzotrifluoride, 2,5-diaminobenzotrifluoride, 3,3′-bistrifluoromethyl-4,4′-diaminobiphenyl, 3,3′-bistrifluoromethyl-5, 5′-diaminobiphenyl, bis (trifluoromethyl) -4,4′-diaminodiphenyl, bis (fluorinated alkyl) -4,4′-diaminodiphenyl, dichloro-4,4′-diaminodiphenyl, dibromo-4, 4′-diaminodiphenyl, bis (fluorinated alkoxy) -4,4′-diaminodiphenyl, diphenyl-4,4′-diaminodiphenyl, 4,4′-bis (4-aminotetrafluorophenoxy) tetrafluorobenzene, 4 , 4'-bis (4-aminotetrafluor
- Tetracarboxylic dianhydride In order to synthesize the polyimide containing the HFIP group for producing the gas separation membrane of the present invention, the tetracarboxylic dianhydride is represented by the general formula (17).
- R 2 is an organic group, preferably a tetravalent organic group in which four hydrogen atoms are substituted from an alkane, alicyclic ring or aromatic ring, and a fluorine atom, a chlorine atom, An oxygen atom, a sulfur atom or a nitrogen atom may be contained, and a part of hydrogen atoms may be substituted with an alkyl group, a fluoroalkyl group, a carboxyl group, a hydroxy group or a cyano group.
- tetracarboxylic dianhydrides examples include benzenetetracarboxylic dianhydride (pyromellitic dianhydride) (hereinafter abbreviated as PMDA), trifluoromethylbenzenetetracarboxylic dianhydride, and bistrifluoromethyl.
- PMDA benzenetetracarboxylic dianhydride
- PMDA trifluoromethylbenzenetetracarboxylic dianhydride
- bistrifluoromethyl bistrifluoromethyl
- Benzenetetracarboxylic dianhydride difluorobenzenetetracarboxylic dianhydride, naphthalenetetracarboxylic dianhydride, biphenyltetracarboxylic dianhydride (hereinafter abbreviated as BPDA), terphenyltetracarboxylic dianhydride, 1,1-bis (3,4-dicarboxyphenyl) ketonic acid dianhydride (hereinafter abbreviated as BTDA), oxydiphthalic acid dianhydride, bicyclo (2,2,2) oct-7-ene-2, 3,5,6-tetracarboxylic dianhydride, 2,2-bis (3,4-dicarboxyphenyl) hexafluoro Propanoic acid dianhydride (hereinafter abbreviated as 6FDA), 2,3,4,5-thiophenetetracarboxylic dianhydride, 2,5,6,2 ′, 5 ′, 6′- he
- PMDA, BPDA, BTDA, and 6FDA are preferable from the viewpoint of easy availability, and 6FDA having good gas separation performance (permeability and selectivity) is particularly preferable.
- 6FDA is a compound represented by the following structural formula.
- polyimide is formed by adding a hexafluoroisopropylidene group (—C (CF 3 ) 2 —) to the structure, the gas is separated into the gas separation membrane.
- the repeating unit containing the structural unit represented by the formula (15) giving high membrane permeability and high selectivity is provided.
- These tetracarboxylic dianhydrides may be used alone or in combination of two or more.
- Dicarboxylic acid derivative In addition to the tetracarboxylic dianhydride, dicarboxylic acid derivatives represented by the general formulas (9) and (10) for adjusting the membrane properties such as separation performance and strength when used as a gas separation membrane May be used.
- the amount used is 10 mol% or more and 80 mol% or less, preferably 30 mol% or more and 60 mol%, relative to the tetracarboxylic dianhydride. Within the range of this molar ratio, gas separation performance, solubility in polar solvents, and membrane strength can be adjusted.
- R 8 is an organic group, preferably a divalent organic group in which two hydrogen atoms are removed from an alkane, alicyclic ring or aromatic ring, and contains an oxygen atom and a sulfur atom in the structure.
- a part of the hydrogen atoms may be substituted with an alkyl group, fluorine, chlorine, fluoroalkyl group, carboxyl group, hydroxy group or cyano group, and A is independently a hydrogen atom, having 1 to 10 carbon atoms. Or an benzyl group.
- R 9 is an organic group, preferably an alkylene group, or a divalent organic group in which one hydrogen atom is removed from an alicyclic ring or aromatic ring, and an oxygen atom, sulfur atom or A nitrogen atom may be contained, and a part of the hydrogen atom may be substituted with an alkyl group, fluorine, chlorine, fluoroalkyl group, carboxyl group, hydroxy group or cyano group, and each X is independently a chlorine atom. , Fluorine atom, bromine atom or iodine atom.
- dicarboxylic acid derivative represented by the general formulas (18) and (19) for synthesizing the fluorine-containing polyimide used for the gas separation membrane of the present invention is exemplified in the form of a raw dicarboxylic acid, an aliphatic dicarboxylic acid Oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, azelaic acid or sebacic acid, aromatic carboxylic acid phthalic acid, isophthalic acid, terephthalic acid, 3,3′- Dicarboxyl diphenyl ether, 3,4'-dicarboxyl diphenyl ether, 4,4'-dicarboxyl diphenyl ether, 3,3'-dicarboxyl diphenyl methane, 3,4'-dicarboxyl diphenyl methane, 4,4'-dicarboxyl diphenyl methane, 3 , 3′-dicarboxyl
- the above-mentioned aromatic diamine containing a HFIP group and tetracarboxylic dianhydride are essential, and if necessary, other diamines and dicarboxylic acids.
- examples thereof include a method in which the derivatives are added and then melted at 150 ° C. or higher and reacted without solvent, and a method in which a condensation reaction is performed in an organic solvent at a reaction temperature of ⁇ 20 to 80 ° C.
- the diamine and carboxylic dianhydride or dicarboxylic acid are reacted in a one-to-one ratio in a molar ratio, so that aromatic diamines containing HFIP groups and other diamines, tetracarboxylic dianhydrides.
- the organic solvent that can be used for the condensation reaction may be an aromatic diamine containing a HFIP group as a raw material compound, tetracarboxylic dianhydride, other diamine, and a dicarboxylic acid derivative.
- -Dimethylformamide, N, N-dimethylacetamide, hexamethylphosphoric triamide or N-methyl-2-pyrrolidone aromatic solvents benzene, anisole, diphenyl ether, nitrobenzene or benzonitrile, halogenated solvents chloroform, dichloromethane 1,2-dichloroethane or 1,1,2,2-tetrachloroethane, lactones ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -valerolactone, ⁇ -caprolactone, ⁇ -caprolactone or ⁇ -methyl- ⁇ - Butyrolactone And the like.
- the polycondensation reaction may be carried out in the presence of these organic solvents and
- the polyamic acid containing the HFIP group obtained by the polymerization reaction is further imidized by cyclization by dehydration ring-closing reaction, and converted into a polyimide containing the target HFIP group. it can.
- the dehydration ring closure reaction is performed under conditions that promote cyclization, such as heating and use of an acid catalyst.
- the polyamic acid solution containing HFIP groups immediately after the polymerization reaction can be imidized at a high temperature of 150 ° C. or more and 250 ° C. or less to prepare a polyimide solution containing HFIP groups.
- pyridine, triethylamine, acetic anhydride or the like may be added.
- the concentration of the polyimide containing HFIP groups in the solution is preferably 5% by mass or more and 50% by mass or less. If it is less than 5% by mass, it is too thin to be industrially practical. If it exceeds 50% by mass, it is difficult to dissolve. Furthermore, it is preferably 10% by mass or more and 40% by mass or less.
- polyimide solution containing HFIP group Preparation of polyimide solution containing HFIP group
- the polyimide solution containing HFIP group thus obtained can be used as it is for gas separation membrane production.
- a polyimide solution containing HFIP groups is added to a poor solvent such as water or alcohol, and polyimide containing HFIP groups is added. After being precipitated and isolated and purified, it may be adjusted by dissolving it again in an organic solvent to the above concentration.
- the organic solvent that can be used is that the polyimide containing the HFIP group is dissolved, and amide solvents N, N-dimethylformamide, N, N-dimethylacetamide, N, N-dimethylformamide, hexamethylphosphoric triamide, N -Halogen solvents such as methyl-2-pyrrolidone, aromatic solvents benzene, anisole, diphenyl ether, nitrobenzene, benzonitrile, chloroform, dichloromethane, 1,2-dichloroethane, 1,1,2,2-tetrachloroethane, Lactones ⁇ -butyrolactone, ⁇ -valerolactone, ⁇ -valerolactone, ⁇ -caprolactone, ⁇ -caprolactone or ⁇ -methyl- ⁇ -butyrolactone, phenols phenol, cresol, xylenol, catechol or chlorfeno Le, or it may be used to select from a mixed solvent thereof.
- the gas separation membrane containing polyimide containing HFIP groups of the present invention is a uniform membrane obtained by a wet film-forming method in which a solvent is evaporated from a polyimide solution containing HFIP groups. Or an asymmetric membrane having a dense layer and a porous layer obtained by other methods.
- a homogeneous film is obtained by wet-coating a polyimide solution containing the above-mentioned HFIP group on a substrate such as a glass substrate using a spin coater, applicator, etc., and then heating in a dry gas such as air, nitrogen or argon. It is obtained by evaporating the solvent and then removing it from the glass substrate.
- a homogeneous film can be obtained by coating a substrate with a polyamic acid solution containing an HFIP group instead of the polyimide solution containing an HFIP group, followed by imidization by heating.
- the thickness of the homogeneous membrane is preferably 5 ⁇ m or more and 1 mm or less. A film thinner than 5 ⁇ m is difficult to manufacture and easily broken. A film thicker than 1 mm is difficult for gas to permeate. More preferably, it is 10 ⁇ m to 200 ⁇ m.
- An asymmetric film having a dense layer and a porous layer can be formed by the method described above. Moreover, after forming an asymmetric film using a polyamic acid solution instead of a polyimide solution, the asymmetric film can also be obtained by thermal imidization.
- the dense layer has different permeation speeds depending on the gas type, and has a gas separation function to be selected for the mixed gas.
- the porous layer has a role as a support for maintaining the membrane shape.
- the asymmetric membrane containing polyimide containing an HFIP group used for the gas separation membrane of the present invention may be either a flat membrane shape or a hollow fiber shape.
- the thickness of the dense layer is preferably 10 nm or more and 10 ⁇ m or less. If it is thinner than 10 nm, it is difficult to form a film and it is not practical. If it is thicker than 10 ⁇ m, it is difficult for gas to permeate. Preferably they are 30 nm or more and 1 micrometer or less.
- the thickness of the porous layer is preferably 5 ⁇ m or more and 2 mm or less for a flat film. If it is thinner than 5 ⁇ m, it is difficult to form a film and it is not practical. If it is thicker than 2 mm, it is difficult for gas to permeate. More preferably, they are 10 micrometers or more and 500 micrometers or less.
- the inner diameter is 10 ⁇ m or more and 4 mm or less, preferably 20 ⁇ m or more and 1 mm or less, and the outer diameter is 30 ⁇ m or more and 8 mm or less, preferably 50 ⁇ m or more and 1.5 mm or less.
- the coagulation liquid for producing the asymmetric membrane water or a mixed solvent of water and an organic solvent is preferably used.
- the mixed solvent contains 40% by mass or more, preferably 50% by mass or more of water, and examples of the organic solvent include alcohols such as methanol, ethanol or isopropanol, and ketones such as acetone, methyl ethyl ketone, and diethyl ketone.
- alcohols such as methanol, ethanol or isopropanol
- ketones such as acetone, methyl ethyl ketone, and diethyl ketone.
- the polyimide containing an HFIP group used for the gas separation membrane of the present invention has an amide solvent N, N-dimethylacetamide, N, N-dimethylformamide or N-methyl due to the effect of containing the polar HFIP group.
- -2-Pyrrolidone, lactones such as ⁇ -butyrolactone and ⁇ -valerolactone are particularly easy to dissolve, and it is easy to produce a homogeneous film with a desired film thickness. It is also easy to do.
- both dry air, aqueous coagulation liquid, etc. are discharged inside the discharge port.
- a desired dense layer can be formed.
- a porous layer having a desired pore size, pore size distribution, and thickness can be formed by changing the organic solvent species of the coagulation bath.
- the film treated with the coagulation liquid is preferably used after being dried by heat treatment.
- the heat treatment temperature is preferably not higher than the glass transition temperature of polyimide so as not to melt.
- a silicone resin may be coated on the surface of the separation membrane.
- a coating method a known coating method such as spin coating, coating with an applicator, or dip coating can be used.
- Silicone resins include general dimethyl silicone, phenyl group-containing silicone, vinyl group-containing silicone, Si-H group-containing silicone, trifluoropropyl group-containing silicone, silanol group-containing silicone, amino group-containing silicone, epoxy group-containing silicone, A methacryl group containing silicone, an acryl group containing silicone, etc. are mentioned. These are commercially available, such as DMS series, PDV series, VDT series, FMV series, HMS series, DMS series, HPM series, FMS series, SQO series, AMS series, MCR series, ECMS series, RMS series manufactured by Gelest. Is mentioned.
- the polymer compound containing the repeating unit represented by the general formula (1) is in combination with an epoxy compound as in the gas separation membranes of the invention 17 and the invention 18. It can be mixed and cured by heating or light irradiation to form a cured film. The cured film can also be applied to the homogeneous film and the asymmetric film.
- Epoxy compounds include phenol novolac resin, cresol novolac resin, aromatic hydrocarbon formaldehyde resin modified phenol resin, dicyclopentadiene modified phenol resin, phenol aralkyl resin, cresol aralkyl resin, naphthol aralkyl resin, biphenyl modified phenol aralkyl resin, phenol triol.
- R 7 is an alkyl group or a monovalent organic group in which one hydrogen atom is removed from an aromatic ring or an alicyclic ring, and the structure contains an oxygen atom, a sulfur atom or a nitrogen atom. And a part of hydrogen atoms may be substituted with a fluorine atom, a chlorine atom, an alkyl group or a fluoroalkyl group, i is an integer of 1 to 4.
- Examples of the alcohol include 1,4-cyclohexanediol, 1,3-adamantanediol, catechol, 1,3-benzenediol, 2,2′-dihydroxybiphenyl, 4,4′-dihydroxybiphenyl, and 2,2′-methylene.
- these epoxy compounds and epoxy resin curing agents may be used in combination.
- the curing agent include amine compounds, acid anhydride compounds, amide compounds, phenol compounds, mercaptan compounds, imidazole compounds, polysulfide resin compounds, and phosphorus compounds.
- thermosetting agents diaminodiphenylmethane, diaminodiphenylsulfone, diethylenetriamine, triethylenetetramine, polyalkylene glycol polyamine, phthalic anhydride, trimellitic anhydride, pyromellitic anhydride, maleic anhydride, tetrahydrophthalic anhydride , Methyltetrahydrophthalic anhydride, methylnadic anhydride, hexahydrophthalic anhydride, methylhexahydrophthalic anhydride, 2-methylimidazole, triphenylphosphine, 2-ethyl-4-methylimidazole, BF3-amine complex or guanidine derivative And diphenyliodonium hexafluorophosphate and triphenylsulfonium hexafluorophosphate which are ultraviolet curing agents.
- the mixing ratio of the epoxy compound and the curing agent for the epoxy resin is 70:30 to 99.5: 0.5, preferably 90:10 to 99: 1, expressed as a mass ratio.
- the gas separation membrane In the intermediate process of manufacturing the gas separation membrane, for example, it is applied to a glass or silicon substrate and then cured by heating or ultraviolet irradiation with an ultraviolet (UV) lamp or the like to form a crosslinked and cured gas separation membrane.
- an ultraviolet (UV) lamp or the like to form a crosslinked and cured gas separation membrane.
- the organic solvent that can be used there is no particular limitation as long as the polyimide is substituted with the HFIP group having the repeating unit represented by the general formula (1) and the composition mainly composed of the epoxy compound is dissolved. Can be used.
- the resulting reaction solution was heated to 200 ° C., further stirred for 6 hours, and then cooled to room temperature to obtain a uniform N-methylpyrrolidone solution.
- the N-methylpyrrolidone solution was applied onto a glass substrate and spin-coated using a spin coater under the application conditions of a rotation speed of 1000 rpm and a holding time of 30 sec.
- the obtained glass substrate was heat-treated at 200 ° C. for 1 hour in a nitrogen atmosphere, and then peeled off from the glass substrate to obtain a film made of polyimide 1, that is, an imide film containing HFIP groups (polyimide 1). When the film thickness was measured, it was 18 ⁇ m.
- Epoxy resin 1 bisphenol A type epoxy resin (JER828 manufactured by Mitsubishi Chemical Corporation)
- Epoxy resin 2 Cresol novolac type epoxy resin (manufactured by Aldrich, catalog No. 408042)
- the gas permeation coefficient was determined by placing a gas separation membrane with a membrane area of 7 cm 2 in a stainless steel cell, and the differential pressure method described in Part 1 of JIS K7126-1: 2006 “Plastics—Film and Sheet—Gas Permeability Test Method”. Measured according to
- helium (He), carbon dioxide gas (CO 2 ), oxygen gas (O 2 ), nitrogen gas (N 2 ) and methane gas (CH 4 ) are used as test gases under the condition of a temperature of 23 ° C.
- helium (He) carbon dioxide gas (CO 2 ), oxygen gas (O 2 ), nitrogen gas (N 2 ) and methane gas (CH 4 ) are used as test gases under the condition of a temperature of 23 ° C.
- the permeability coefficient and separation performance of each gas were measured.
- the permeation coefficient differs depending on the type of gas, and the ratio of the permeation coefficient between He and CH 4 is 155, which indicates sufficient performance as a gas separation membrane.
- the gas separation performance of the polyimide membrane (polyimide 1) containing HFIP groups of Example 2 for use in the gas separation membrane of the present invention, and hexafluoro not containing HFIP groups of Comparative Example 1 not within the scope of the present invention The gas separation performance of polyimide membranes containing isopropylidene groups was compared. The performance indicates the data described in Non-Patent Document 2.
- Table 4 shows the gas permeation coefficients of He, CO 2 , O 2, and CH 4 of the film made of the fluorine-containing polyimide of Comparative Example 1.
- the permeation performance of He and CO 2 of the gas separation membrane made of polyimide 1 of Example 1, which is a polyimide membrane containing the HFIP group of the present invention is a comparative example that is not in the category of the present invention.
- the separation performance was superior to that of the gas separation membrane of Comparative Example 1.
- polyimide 3, polyimide 4, polyimide 7, polyimide 21, and polyimide 22 of the present invention have higher transmission coefficients than Upilex and Kapton, which are conventional resins. I understood it.
- the polyimide 3, polyimide 4, polyimide 7, polyimide 21, and polyimide 22 of the present invention are more separated than conventional resins, Upilex and Kapton. Was found to be expensive.
- polyimide 3, polyimide 4, polyimide 7, polyimide 21, and polyimide 22 have higher permeability coefficient and separation performance than conventional resins, Upilex and Kapton, and were excellent as separation membranes.
- the CO 2 and transmission coefficient of polyimide 2, polyimide 5, polyimide 6, polyimide 8-20, and polyimide 23-27 were 4 to 82 Barrer. Since the CO 2 permeability coefficients of the Kapton and Uplex membranes were 0.67 Barrer and 0.16 Barrer, respectively, the CO 2 of the polyimide 2, polyimide 5, polyimide 6, polyimides 8 to 20, and polyimides 23 to 27 of the present invention. It was found that the permeability coefficient of imide membrane was high in CO 2 permeability coefficient.
- the separation performance of CO 2 / CH 4 for polyimide 2, polyimide 5, polyimide 6, polyimide 8 to 20, and polyimide 23 to 27 was 18 to 62. Since the CO 2 / CH 4 separation performance of the Kapton and Uplex membranes was 5.6, 4 , the CO of polyimide 2, polyimide 5, polyimide 6, polyimides 8-20 and polyimides 23-27 of the present invention towards the separation performance of the 2 transmission coefficient and CO 2 / CH 4 it was found to be high.
- polyimide 2 polyimide 5, polyimide 6, polyimides 8 to 20, and polyimides 23 to 27 have higher CO 2 permeability coefficient and CO 2 / CH 4 separation performance than conventional resins, Upilex and Kapton. It was excellent as a separation membrane.
- the gas separation membrane comprising a fluorine-containing polyimide membrane containing an HFIP group of the present invention has a large difference in permeation rate (gas permeability coefficient) depending on the type of gas, and is excellent in gas separation performance. Therefore, it is suitably used for application to technology for separation / fixation of carbon dioxide from liquefied natural gas or the like, and for a water-ethanol separation membrane for the purpose of recovering ethanol for fuel.
Abstract
Description
一般式(1):
で表される繰り返し単位を含むポリイミドを有する、気体分離膜。
R1が一般式(2):
で表される2価の有機基である、請求項1に記載の気体分離膜。
一般式(2)で表される2価の有機基が、
一般式(6):
で表される2価の有機基である、発明2に記載の気体分離膜。
一般式(2)で表される2価の有機基が、
一般式(8):
で表される2価の有機基である、発明2の気体分離膜。
R1が一般式(10):
で表される2価の有機基である、発明1の気体分離膜。
R1に含まれる2-ヒドロキシ-1,1,1,3,3,3-ヘキサフルオロイソプロピル基が有するOH基の水素原子がグリシジル基で置換されてなる、発明1~15のいずれかの気体分離膜。
グリシジル基の環状エーテル部位が開環し架橋してなる発明16の気体分離膜。
さらにエポキシ化合物と混合し加熱して得られる、発明1~16のいずれかの気体分離膜。
本発明の気体分離膜を作製するためのHFIP基を含むポリイミドを合成するための単量体化合物としての、HFIP基を含む芳香族ジアミンを、以下の一般式(2A)~(14A)に示す。
で表される2価の有機基である、請求項1に記載の気体分離膜。
本発明の気体分離膜において、気体分離膜とした際の気体分離性能および膜強度などの膜物性の調整のために、HFIP基を含むポリイミドの合成において、HFIP基を含む芳香族ジアミンに加え、他のジアミン、例えば、ジヒドロキシアミンを用いてもよい。使用量は、前記テトラカルボン酸二無水物に対し10モル%から80モル%であり、好ましくは30モル%から60モル%である。ガス分離性能、極性溶剤への溶解性、膜強度等の諸性能の調節を行なうことが可能となる。
本発明の気体分離膜を作製するためのHFIP基を含むポリイミドを合成するためテトラカルボン酸二無水物を一般式(17)に示す。
6FDAは下記構造式で表される化合物であり、構造中にヘキサフルオロイソプロピリデン基(―C(CF3)2-)を加えることで、ポリイミドとした際に、気体分離膜に、分離するガスの高い膜透過性および高い選択性を与える前記式(15)で表される構造単位を含む繰り返し単位を与える。
気体分離膜とした際の分離性能および強度等の膜物性の調整のために、前記テトラカルボン酸二無水物に加え、一般式(9)、(10)で表されるジカルボン酸誘導体を使用してもよい。使用量は、前記テトラカルボン酸二無水物に対し10モル%以上、80モル%以下であり、好ましくは30モル%以上、60モル%である。本モル比の範囲内で、ガス分離性能、極性溶剤への溶解性、膜強度の調整を行うことができる。
一般式(18):
一般式(19):
本発明の気体分離膜に使用するHFIP基を含むポリイミドを合成する際の、縮重合反応について説明する。
このようにして得られたHFIP基を含むポリイミドの溶液は、気体分離膜製造にそのまま用いることもできる。また、HFIP基を含むポリイミドの溶液中に含まれる残存モノマー、低分子量体を除去する目的で、水またはアルコール等の貧溶媒中に、HFIP基を含むポリイミドの溶液を加え、HFIP基を含むポリイミドを沈殿させて単離精製した後、改めて有機溶媒に前記濃度になるように溶解させて調整してもよい。
本発明のHFIP基を含むポリイミドを含む気体分離膜は、HFIP基を含むポリイミド溶液から溶媒が蒸発することを利用して薄膜を作製する湿式成膜法で得られる均一な膜、または他の方法で得られる緻密層と多孔質層とを有する非対称膜のいずれであってもよい。
前記一般式(1)で表される繰り返し単位を含む高分子化合物は、機械強度または耐可塑性を向上させる目的で、発明17および発明18の気体分離膜のように、エポキシ化合物と混合し、加熱または光照射等により硬化させて硬化膜とすることができる。当該硬化膜は、前記の均質膜、および非対称膜にも適用可能である。
で表されるエポキシ化合物は、これに対応するアルコールとエピクロロヒドリンから合成される。
気体分離膜用のHFIP基を含むポリイミド膜の調製について説明する。
ポリイミド1に対し、ガス透過係数の測定および分離性能の評価を行った。以下に気体分離膜のガス透過性能の測定方法を示す。
次いで、前記のHFIP基を含むポリイミド膜(ポリイミド1)のガス分離性能と、従来の本発明の範疇にない以下構造式のHFIP基を含まない含フッ素ポリイミド膜(比較例1)のガス分離性能を比較した。
ポリイミド1と同様の評価方法を用い、ポリイミド3、ポリイミド4、ポリイミド7、ポリイミド21およびポリイミド22について、透過係数測定および分離性能評価行った。透過係数の測定結果を表7に、分離性能の評価結果を表8に示す。
次いで、従来樹脂としてユーピレックス(宇部興産株式会社製)、カプトン(東レ・デュポン株式会社製)を選択し、前記のポリイミド3、ポリイミド4、ポリイミド7、ポリイミド21およびポリイミド22と、透過係数および分離性能を比較した。透過係数の測定結果を表9に、分離性能の評価結果を表10に示す。なお、ユーピレックスとカプトンの透過係数と分離性能は、ポリイミド1と同様の方法で測定した。
次いで、従来樹脂としてユーピレックスおよびカプトンを選択し、本発明のポリイミド2、ポリイミド5、ポリイミド6、ポリイミド8~20、ポリイミド23~27のCO2の透過係数とCO2/CH4の分離性能を比較した。
Claims (19)
- 一般式(2)で表される2価の有機基が、
一般式(8):
で表される2価の有機基である、請求項2に記載の気体分離膜。 - R1に含まれる2-ヒドロキシ-1,1,1,3,3,3-ヘキサフルオロイソプロピル基が有するOH基の水素原子がグリシジル基で置換されてなる、請求項1乃至請求項15のいずれか1項に記載の気体分離膜。
- グリシジル基の環状エーテル部位が開環し架橋してなる、請求項16に記載の気体分離膜。
- さらにエポキシ化合物と混合し加熱して得られる、請求項1乃至請求項16のいずれか1項に記載の気体分離膜。
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CA2834670A CA2834670C (en) | 2011-05-30 | 2012-05-30 | Gas separation membrane comprising fluorinated polyimide |
EP12792044.5A EP2716351B1 (en) | 2011-05-30 | 2012-05-30 | Gas separation membrane |
RU2013151295/05A RU2567610C2 (ru) | 2011-05-30 | 2012-05-30 | Газоразделительная мембрана |
US13/880,334 US9061253B2 (en) | 2011-05-30 | 2012-05-30 | Gas separation membrane |
KR1020137034784A KR101559854B1 (ko) | 2011-05-30 | 2012-05-30 | 기체 분리막 |
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WO2016052312A1 (ja) * | 2014-10-02 | 2016-04-07 | セントラル硝子株式会社 | 有機エレクトロルミネッセンス用基板およびそれを用いた有機エレクトロルミネッセンスディスプレイ |
JP2016076480A (ja) * | 2014-10-02 | 2016-05-12 | セントラル硝子株式会社 | 有機エレクトロルミネッセンス用基板およびそれを用いた有機エレクトロルミネッセンスディスプレイ |
CN106797683A (zh) * | 2014-10-02 | 2017-05-31 | 中央硝子株式会社 | 有机电致发光用基板及使用其的有机电致发光显示器 |
JP2019196459A (ja) * | 2018-05-11 | 2019-11-14 | セントラル硝子株式会社 | 電子部品用ポリイミド基板 |
JP7265113B2 (ja) | 2018-05-11 | 2023-04-26 | セントラル硝子株式会社 | 電子部品用ポリイミド基板 |
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CN103561852A (zh) | 2014-02-05 |
US20140174293A1 (en) | 2014-06-26 |
KR20140016399A (ko) | 2014-02-07 |
RU2013151295A (ru) | 2015-07-10 |
CA2834670A1 (en) | 2012-12-06 |
US9061253B2 (en) | 2015-06-23 |
JP5915376B2 (ja) | 2016-05-11 |
CA2834670C (en) | 2016-12-06 |
JP2013010096A (ja) | 2013-01-17 |
KR101559854B1 (ko) | 2015-10-13 |
EP2716351A1 (en) | 2014-04-09 |
CN103561852B (zh) | 2016-03-30 |
EP2716351B1 (en) | 2016-06-29 |
RU2567610C2 (ru) | 2015-11-10 |
EP2716351A4 (en) | 2014-11-26 |
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