CN108097070A - A kind of polyether block amide gas separation membrane for adulterating zeolite imidazole ester and its preparation method and application - Google Patents
A kind of polyether block amide gas separation membrane for adulterating zeolite imidazole ester and its preparation method and application Download PDFInfo
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Abstract
The invention discloses a kind of polyether block amides for adulterating zeolite imidazole ester（PEBA）Gas separation membrane and its preparation method and application, the present invention is successfully prepared 8 two kinds of inorganic nano materials of ZIF 8 and Zn/Ni ZIF, and it is mixed with polyether co-polyamide under 40 80 °C, 8 PEBA and Zn/Ni ZIF of ZIF, 8 PEBA mixed substrate membrane containing nano-grade molecular sieves are made by dry method phase inversion.The advantage of the invention is that：The preparation method of inorganic material is simple, and mild condition is easily operated, environmental-friendly；Obtained film acid-fast alkali-proof, flexibility are good；Gas separation is used it for, there is excellent comprehensive performance；Especially, adding the 8 PEBA mixed substrate membrane containing nano-grade molecular sieves of Zn/Ni ZIF that content is 10wt% has high CO2Permeation flux and CO2/N2Selectivity.
Description
Technical field
The present invention relates to a kind of polyether block amide gas separation membrane for adulterating zeolite imidazole ester and preparation method thereof and answer
With belonging to gas separation membrane technical field.
Background technology
The problem of warming with global climate has been to be concerned by more and more people, and solves carbon dioxide (CO in air2)
Discharge and using effective method trap CO2The problem of being in the urgent need to address.In addition, carbon dioxide (CO2) one can be used as
Kind potential " carbon resource " is used, all interesting always in the fields such as aerospace and military equipment.CO2Separation return
Receipts technology mainly has absorption and separation method, adsorption method of separation, low temperature distillation partition method and membrane separation process etc..Compared with other methods,
It is excellent that membrane separation process has that separative efficiency is high, low energy consumption, (easily amplification and automatic control) easy to operate, environmental-friendly and floor space are small etc.
Point is current most potential gas separating method.In gas separation membrane, inoranic membrane have chemical property stabilization, regenerating easily,
The advantages that resistance to various acid-base medium corrosion, but its development is subject to due to the poor plasticity film, cracky, expensive etc.
Certain limitation；And polymer film is because mechanical performance is high, recyclability is widely used in separating CO by force2, but its separating property by
To the limitation of trade-off.Therefore, the mixed substrate membrane containing nano-grade molecular sieve obtained by inorganic particulate is introduced into polymer matrix（MMMs）, knot
The excellent properties of the two have been closed, have become the hot spot of current research.
The content of the invention
The present invention is intended to provide a kind of polyether block amide gas separation membrane for adulterating zeolite imidazole ester, is prepared for first
Two kinds of inorganic material of ZIF-8 and Zn/Ni-ZIF-8, and be added in polyether-polyamide block copolymer PEBA, comparison two
The different additive of kind is to UF membrane CO2Permeability and selectivity influence, and have studied addition content and pressure film is oozed
The influence of selectivity thoroughly.The present invention also provides the preparation method and application of the gas separation membrane.
The present invention provides a kind of polyether block amide gas separation membrane for adulterating zeolite imidazole ester, first using solvent heat
Method prepares zeolite imidazole ester material, and the polyether block amide of doping zeolite imidazole ester is then prepared using dry method phase inversion
Gas separation membrane；Prepared film is homogeneous membrane, and isolation medium is polyether-polyamide block copolymer, and additive is zeolite miaow
Azoles ester material,
The wet-film thickness of gas separation membrane is 50 ~ 500 μm.
In said program, the zeolite imidazole ester material is ZIF-8 or Zn/Ni-ZIF-8, and wherein ZIF-8 is by metallic zinc
Nitrogen-atoms in ion and methylimidazole ester is coordinated the cage compound that the tetrahedron element to be formed is formed, and Zn/Ni-ZIF-8 is
The cage compound being made of metallic nickel ions instead of the part zinc ion on ZIF-8 structural units, addition content for 5~
20wt%.
In said program, the grain size of the ZIF-8 materials is 45 ~ 55nm, and the grain size of Zn/Ni-ZIF-8 is 38 ~ 46nm.
The present invention provides it is a kind of adulterate zeolite imidazole ester polyether block amide gas separation membrane preparation method, including
Following steps：
Step 1: the preparation of ZIF-8：
Zinc nitrate hexahydrate is dissolved in the solution for being made into that concentration is 0.01 ~ 0.1mol/L in methanol solution, by 2-methylimidazole
Be dissolved in be made into 100mL methanol solutions concentration be 0.04 ~ 7mol/L solution, be then respectively put into 4A molecular sieves stand 6 ~
For 24 hours, extra moisture is removed, respectively obtains the methanol solution of zinc nitrate hexahydrate and the methanol solution of 2-methylimidazole, six water
The methanol solution for closing zinc nitrate is named as product A；The methanol solution of 2-methylimidazole is named as product B；Then, by product B and
Product A is poured into three-necked flask, and 12 ~ 48h is stirred under 20 ~ 80oC and is chemically reacted, to acquired solution 8000 ~
10 ~ 120min of centrifugation in the range of speeds of 12000rpm after the lower sediment in centrifuge tube is washed three times with methanol, is placed on 60 ~ 100
Dry 12 in oC vacuum drying ovens ~ for 24 hours to get the ZIF-8 powder of white；
The molar ratio of zinc nitrate hexahydrate and 2-methylimidazole is 1 ~ 10:4~700；5 ~ 30g 4A are used per 100mL methanol solutions
Molecular sieve；
Step 2: the preparation of casting solution：
Polyether block amide is dissolved in the solution that 30 ~ 200g/L is made into n,N-dimethylacetamide, with being prepared in step 1
ZIF-8 powder mixing, obtained solution C；By solution C 0.5 ~ 4h of ultrasonic disperse, then use magnetic stirring apparatus rotating speed for 100 ~
500rpm, temperature to form homogeneous casting solution for 12 ~ 48h of stirring in 20 ~ 90oC to being completely dissolved, and are named as product D, and at 25 °C
Constant temperature deaeration 12 ~ for use for 24 hours；
The mass ratio of polyether block amide and ZIF-8 powder is 3 ~ 20：0.15~5；
Step 3: film preparation：
The product D of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film as 50 ~ 500 μm, so
Glass plate placement is made into solvent 24 ~ 48h of volatilization at normal temperatures afterwards, then 24 ~ 48h is dried to remove in the vacuum drying oven of 40 ~ 90oC
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
In above-mentioned preparation method, in step 2, supersonic frequency is 20 ~ 50kHz, and ultrasonic temperature is 20 ~ 70 °C；Step 2 is matched somebody with somebody
The solid content of polyether block amide is 3 ~ 25wt% in the casting solution of system, and ZIF-8 powder accounts for the mass percent of polyether block amide
For 5~20wt%.
In above-mentioned preparation method, step 3 prepare doping zeolite imidazole ester polyether block amide gas separation membrane it is wet
Film thickness is 50 ~ 500 μm.
The present invention provides the preparation method of the polyether block amide gas separation membrane of another doping zeolite imidazole ester, bags
Include following steps：
Step 1: the preparation of Zn/Ni-ZIF-8：
Zinc nitrate hexahydrate, Nickelous nitrate hexahydrate, 2-methylimidazole are dissolved in respectively in methanol solution and are configured to concentration difference
For 0.01 ~ 0.1mol/L, 0.01 ~ 0.1mol/L, 0.08 ~ 12mol/L solution, be then respectively put into 4A molecular sieves stand 6 ~
Extra moisture is removed for 24 hours, obtains the methanol solution of zinc nitrate hexahydrate, the methanol solution of Nickelous nitrate hexahydrate and 2- methyl miaows
The methanol solution of azoles；The methanol solution of zinc nitrate hexahydrate is named as product E, the methanol solution of Nickelous nitrate hexahydrate is named as production
Object F, the methanol solution of 2-methylimidazole are named as product G；Then, product E, product F and product G are poured into three-necked flask,
It stirs 12 ~ 48h under 20 ~ 80oC to chemically react, the centrifugation 10 in the range of speeds of 8000 ~ 12000rpm to acquired solution
~ 120min, after the lower sediment in centrifuge tube is washed three times with methanol, dry 12 are placed in 60 ~ 100oC vacuum drying ovens ~ for 24 hours, i.e.,
Obtain the Zn/Ni-ZIF-8 powder of purple；
Wherein, the zinc nitrate hexahydrate, Nickelous nitrate hexahydrate, the molar ratio of 2-methylimidazole are 1 ~ 10：1~10：8~1200；
5 ~ 30g 4A molecular sieves are used per 100mL methanol solutions；
Step 2: the preparation of casting solution：
Polyether block amide is dissolved in be made into n,N-dimethylacetamide concentration be 30 ~ 200g/L solution, then with step
The Zn/Ni-ZIF-8 powder mixing prepared in rapid one, 0.5 ~ 4h of ultrasonic disperse, then use magnetic stirring apparatus rotating speed for 100 ~
500rpm scopes, temperature to form homogeneous casting solution for 12 ~ 48h of stirring in the range of 20 ~ 90oC to being completely dissolved, and are named as product H,
It is and for use in 25 °C of constant temperature deaerations 12 ~ for 24 hours；
Wherein, the mass ratio of polyether block amide and Zn/Ni-ZIF-8 powder is 3 ~ 20：0.15~5；
Step 3: the preparation of film：The product H of step 2 is uniformly scraped with scraper on clean glass plate, controls wet film
Thickness is 50 ~ 500 μm, and glass plate placement is then made solvent 24 ~ 48h of volatilization, then the vacuum drying oven in 40 ~ 90oC at normal temperatures
Middle 24 ~ 48h of drying is to remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
In above-mentioned preparation method, in step 2, the frequency of ultrasonic disperse is 20 ~ 50kHz, and ultrasonic temperature is 20 ~ 70 °C；Step
Ensure the solid content of polyether block amide in rapid two casting solutions prepared as 3 ~ 25wt%, Zn/Ni-ZIF-8 powder accounts for polyether block
The mass percent of amide is 5~20wt%.
In above-mentioned preparation method, step 3 prepare doping zeolite imidazole ester polyether block amide gas separation membrane it is wet
Film thickness is 50 ~ 500 μm.
Polyether block amide gas separation membrane the present invention also provides the doping zeolite imidazole ester is in separation CO2Gas
In application.Obtained film is used to separate CO2And N2, the test of gas permeability using constant pressure variant area method, film infiltration
Effective area is 1 ~ 12.56cm2, scavenging is using H2, scavenging flow velocity is 10~60mL min-1, feeding gas flow velocity is 10~60mL
min-1, the flow of feed side and per-meate side measures with soap film flowmeter, and per-meate side constituent content is measured with gas-chromatography；Test temperature
It spends for room temperature, pressure difference is 0.1~0.8MPa.
The principle of the present invention is：
1. the introducing of inorganic particulate, on the one hand can improve with the pore structure of modified membrane and distribution, enhance mechanical performance and heat it is steady
It is qualitative；On the other hand the defects of permeability of the membrane and selectivity can be improved, make up two kinds of films itself or even break
" Robeson " upper limit.
②ZIF-8(Zn(Hmim)2, Hmim is 2-methylimidazole) due to its with larger porosity, specific surface area and
Ultra-microporous possesses size for 3.4 and 11.6 two kinds of ducts, and CO2And N2Kinetic diameter be respectively 3.3 Hes
3.64, therefore, ZIF-8 is to CO2There is good sieving actoion.
3. Zn/Ni-ZIF-8 by way of fabricated in situ with Ni instead of a part of Zn on ZIF-8 skeletons, but not
There is the cage structure for changing ZIF-8.It is to sieve with two kinds of mechanism of π complexings of metal ion to separate CO based on molecule2
And N2.On the one hand, it remains the pore passage structure of ZIF-8, and having just makes CO2Gas molecule（3.3Å）By duct（3.4Å）,
On the other hand, in Zn/Ni-ZIF-8, zinc and nickel ion due to the characteristic of its own, as the quantity of unoccupied orbital, charge number, from
Sub- radius etc., to CO2Affinity it is different, so as to generate to CO2The asymmetric absorption of gas molecule.Therefore, based on size
Screening and the synergistic effect of asymmetric absorption, Zn/Ni-ZIF-8, which is added in membrane material, has higher CO2Permeance property and
CO2/N2Separating property.
Beneficial effects of the present invention：
It is 1. the simple controllable, mild condition of inorganic material and the preparation process of film in the present invention, easily operated；Filming technology letter
It is single, it is environmental-friendly；
2. by UF membrane CO obtained2And N2, find to be with the addition of the CO of the mixed substrate membrane containing nano-grade molecular sieve of ZIF-8 and Zn/Ni-ZIF-82Ooze
Permeability and the purer film of selectivity are all greatly improved, and have broken trade-off effects；
3. Zn/Ni-ZIF-8 is to CO2Asymmetric absorption and size sieving actoion make the Zn/Ni-ZIF- that additive amount is 10wt%
8-PEBA mixed substrate membrane containing nano-grade molecular sieves have higher permeability and separation performance, CO2For permeance property up to 321Barrer, purer polyethers is embedding
Section amide film improves 97%, CO2/N2 selectivity up to 43, and purer polyether block amide film improves 43%.；
4. obtained film acid-fast alkali-proof, flexibility are good.
Description of the drawings
Fig. 1 is the scanning electron microscope (SEM) photograph of the Zn/Ni-ZIF-8 obtained by embodiment 1；
Fig. 2 is the scanning electron microscope (SEM) photograph of the 10wt% Zn/Ni-ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieve sections obtained by embodiment 1；
Fig. 3 is the scanning electron microscope (SEM) photograph of the ZIF-8 obtained by embodiment 5.
Specific embodiment
It is further illustrated the present invention below by embodiment, but is not limited to following embodiment.
Comparative example 1：The pure polyether block amide film that solid content is 6wt% is prepared, step is as follows：
6g polyether block amides are dissolved in the n,N-dimethylacetamide (DMAc) of 100mL, are being turned using magnetic stirring apparatus
Speed is 500rpm, temperature is that 70oC stirrings 48h to form homogeneous casting solution to being completely dissolved, and for use in 25 °C of constant temperature deaeration 12h.
Casting solution is uniformly scraped with scraper on clean glass plate, the thickness of wet film is controlled then to place glass plate for 300 μm
Make solvent volatilization 48h at normal temperatures, then 48h is dried to remove residual solvent in the vacuum drying oven of 60oC.After removing solvent
Film is taken off from glass plate, keeps properly for use.
Embodiment 1：Prepare additive Zn/Ni-ZIF-8 account for matrix mass percent be 10wt% Zn/Ni-ZIF-8-
PEBA mixed substrate membrane containing nano-grade molecular sieves, step are as follows：
Step 1: the preparation of Zn/Ni-ZIF-8：By the zinc nitrate hexahydrate of 4mmol, the Nickelous nitrate hexahydrate of 4mmol, 60mmol
2-methylimidazole be dissolved in respectively in 100mL methanol solutions, be then respectively put into 10g 4A molecular sieves stand 10h remove it is extra
Moisture, obtain the methanol solution of zinc nitrate hexahydrate（It is named as product E）, Nickelous nitrate hexahydrate methanol solution（It is named as
Product F）With the methanol solution of 2-methylimidazole（It is named as product G）；Then, product E, product F and product G are poured into three mouthfuls of burnings
In bottle, stir under 25oC and chemically react for 24 hours, to acquired solution 10000rpm rotating speed centrifugation 50min, in centrifuge tube
Lower sediment washed three times with methanol after, be placed in 80oC vacuum drying ovens dry for 24 hours to get the Zn/Ni-ZIF-8 powder of purple；
Attached drawing 1 illustrates that obtained Zn/Ni-ZIF-8 grain shapes are regular, and particle diameter distribution is homogeneous, particle size is about 38 ~
46nm。
Step 2: the preparation of casting solution：By the Zn/Ni-ZIF-8 powder prepared in 0.6g step 1 and the polyether block of 6g
Amide is dissolved in the n,N-dimethylacetamide of 100mL, frequency in 50kHz, in 30 °C of temperature ultrasound 4h, then using magnetic
Power blender rotating speed be 500rpm, temperature be 70oC stirring 48h to form homogeneous casting solution to being completely dissolved（It is named as product
H）, and it is for use in 25 °C of constant temperature deaeration 12h；
Step 3: film preparation：The product H of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film
Spend for 300 μm, then solvent made to volatilize 48h at normal temperatures glass plate placement, then in the vacuum drying oven of 60oC dry 48h with
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
Attached drawing 2 illustrate obtained 10wt% Zn/Ni-ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves be it is fine and close, it is flawless.
Zn/Ni-ZIF-8 can be evenly dispersed in polyether block amide matrix, shown between Zn/Ni-ZIF-8 and polyether block amide
There is preferable compatibility.
By film made from comparative example 1, embodiment 1 in room temperature, pressure difference is to test CO under the dry conditions of 0.2MPa2, N2Gas
Permeance property.Pure polyether block amide film is measured to CO2Infiltration coefficient for 163Barrer, CO2/N2 is selectively 30.
10wt% Zn/Ni-ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves are to CO2Infiltration coefficient be 321Barrer, CO2/N2 is selectively
43.Compared with pure film, the permeability and separation performance of Zn/Ni-ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves is improved.
Embodiment 2：It prepares Zn/Ni-ZIF-8 and accounts for Zn/Ni-ZIF-8-PEBA mixing of the mass percent of matrix for 5wt%
Matrix membrane, step are as follows：
Step 1: the preparation of Zn/Ni-ZIF-8：By the zinc nitrate hexahydrate of 6mmol, the Nickelous nitrate hexahydrate of 6mmol, 60mmol
2-methylimidazole be dissolved in respectively in 100mL methanol solutions, be then respectively put into 15g 4A molecular sieves stand 20h remove it is extra
Moisture, obtain the methanol solution of zinc nitrate hexahydrate（It is named as product E）, Nickelous nitrate hexahydrate methanol solution（It is named as
Product F）With the methanol solution of 2-methylimidazole（It is named as product G）；Then, product E, product F and product G are poured into three mouthfuls of burnings
In bottle, stir under 40oC and chemically react for 24 hours, to acquired solution 10000rpm rotating speed centrifugation 50min, in centrifuge tube
Lower sediment washed three times with methanol after, be placed in 90oC vacuum drying ovens dry for 24 hours to get the Zn/Ni-ZIF-8 powder of purple；
Step 2: the preparation of casting solution：By the Zn/Ni-ZIF-8 powder prepared in 0.3g step 1 and the polyether block amide of 6g
It is dissolved in the n,N-dimethylacetamide of 100mL, frequency in 20kHz is stirred in 30 °C of temperature ultrasound 4h, then using magnetic force
Mix device rotating speed be 300rpm, temperature be 60oC stirring 48h to form homogeneous casting solution to being completely dissolved（It is named as product H）, and
It is for use in 25 °C of constant temperature deaeration 12h；
Step 3: film preparation：The product H of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film
Spend for 300 μm, glass plate placement then made into solvent volatilization for 24 hours at normal temperatures, then in the vacuum drying oven of 80oC dry 48h with
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
By prepared mixed substrate membrane containing nano-grade molecular sieve in room temperature, pressure is to test CO under the dry conditions of 0.3MPa2, N2Gas oozes
Permeability energy, measures CO2Infiltration coefficient be 289Barrer, CO2/N2Selectivity is 42.
Embodiment 3：Prepare Zn/Ni-ZIF-8 account for matrix mass percent be 15wt% Zn/Ni-ZIF-8-PEBA mix
Matrix membrane is closed, step is as follows：
Step 1: the preparation of Zn/Ni-ZIF-8：By the zinc nitrate hexahydrate of 3mmol, the Nickelous nitrate hexahydrate of 3mmol, 60mmol
2-methylimidazole be dissolved in respectively in 100mL methanol solutions, be then respectively put into 5g 4A molecular sieves stand 20h remove it is extra
Moisture, obtain the methanol solution of zinc nitrate hexahydrate（It is named as product E）, Nickelous nitrate hexahydrate methanol solution（It is named as
Product F）With the methanol solution of 2-methylimidazole（It is named as product G）；Then, product E, product F and product G are poured into three mouthfuls of burnings
In bottle, stir under 60oC and chemically react for 24 hours, to acquired solution 8000rpm rotating speed centrifugation 30min, in centrifuge tube
Lower sediment washed three times with methanol after, be placed in 100oC vacuum drying ovens Zn/Ni-ZIF-8 powder of the dry 12h to get purple
End；
Step 2: the preparation of casting solution：By the Zn/Ni-ZIF-8 powder prepared in 1.5g step 1 and the polyether block acyl of 10g
Amine solvent is in the n,N-dimethylacetamide of 100mL, frequency in 30kHz, in 60 °C of temperature ultrasound 4h, then using magnetic force
Blender rotating speed be 500rpm, temperature be 70oC stirring to form homogeneous casting solution to being completely dissolved for 24 hours（It is named as product H）,
It is and for use in 25 °C of constant temperature deaeration 12h；
Step 3: film preparation：The product H of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film
Spend for 200 μm, then solvent made to volatilize 48h at normal temperatures glass plate placement, then in the vacuum drying oven of 60oC dry 48h with
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
By prepared mixed substrate membrane containing nano-grade molecular sieve in room temperature, pressure is to test CO under the dry conditions of 0.5MPa2, N2Gas oozes
Permeability energy, measures CO2Infiltration coefficient be 521Barrer, CO2/N2Selectivity is 45.
Embodiment 4：Prepare Zn/Ni-ZIF-8 account for matrix mass percent be 20wt% Zn/Ni-ZIF-8-PEBA mix
Matrix membrane is closed, step is as follows：
Step 1: the preparation of Zn/Ni-ZIF-8：By the zinc nitrate hexahydrate of 8mmol, the Nickelous nitrate hexahydrate of 8mmol, 70mmol
2-methylimidazole be dissolved in respectively in 100mL methanol solutions, be then respectively put into 30g 4A molecular sieves standing remove for 24 hours it is extra
Moisture, obtain the methanol solution of zinc nitrate hexahydrate（It is named as product E）, Nickelous nitrate hexahydrate methanol solution（It is named as
Product F）With the methanol solution of 2-methylimidazole（It is named as product G）；Then, product E, product F and product G are poured into three mouthfuls of burnings
In bottle, stir under 25oC and chemically react for 24 hours, to acquired solution 12000rpm rotating speed centrifugation 60min, in centrifuge tube
Lower sediment washed three times with methanol after, be placed in 100oC vacuum drying ovens Zn/Ni-ZIF-8 powder of the dry 12h to get purple
End；
Step 2: the preparation of casting solution：By the Zn/Ni-ZIF-8 powder prepared in 1.2g step 1 and the polyether block amide of 6g
It is dissolved in the n,N-dimethylacetamide of 100mL, frequency in 50kHz is stirred in 40 °C of temperature ultrasound 4h, then using magnetic force
Mix device rotating speed be 500rpm, temperature be 70oC stirring to form homogeneous casting solution to being completely dissolved for 24 hours（It is named as product H）, and
It is for use in 25 °C of constant temperature deaeration 12h；
Step 3: film preparation：The product H of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film
Spend for 100 μm, then solvent made to volatilize 48h at normal temperatures glass plate placement, then in the vacuum drying oven of 80oC dry 48h with
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
By prepared mixed substrate membrane containing nano-grade molecular sieve in room temperature, pressure is to test CO under the dry conditions of 0.2MPa2, N2Gas oozes
Permeability energy, measures CO2Infiltration coefficient be 478Barrer, CO2/N2Selectivity is 38.
Embodiment 5：Prepare ZIF-8 account for matrix mass percent be 5wt% ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves, step
It is as follows：
Step 1: the preparation of ZIF-8：The zinc nitrate hexahydrate of 6mmol is dissolved in 100mL methanol solutions, the 2- first of 40mmol
Base imidazoles is also dissolved in 100mL methanol solutions, is then respectively put into 20g 4A molecular sieves and is stood the extra moisture of 15h removings,
Obtain the methanol solution of zinc nitrate hexahydrate（It is named as product A）With the methanol solution of 2-methylimidazole（It is named as product B）；So
Afterwards, product B and product A are poured into three-necked flask, stirs under 25oC and chemically react for 24 hours, exist to acquired solution
The rotating speed centrifugation 30min of 8000rpm, after the lower sediment in centrifuge tube is washed three times with methanol, is placed in 90oC vacuum drying ovens and does
It is dry for 24 hours to get white ZIF-8 powder；
Attached drawing 3 illustrates that obtained ZIF-8 grain shapes are regular, and particle diameter distribution is homogeneous, and particle size is about 45 ~ 55nm.
Step 2: the preparation of casting solution：The polyether block amide of the ZIF-8 powder prepared in 0.3g step 1 and 6g is molten
Solution is in the n,N-dimethylacetamide of 100mL, obtained solution C；By frequency of the solution C in 30kHz, the ultrasound of the temperature at 40 °C
4h, then use magnetic stirring apparatus rotating speed for 300rpm, temperature be 70oC stirring to form homogeneous casting solution to being completely dissolved for 24 hours
（It is named as product D）, and it is for use in 25 °C of constant temperature deaeration 12h；
Step 3: film preparation：The product D of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film
Spend for 300 μm, glass plate placement then made into solvent volatilization for 24 hours at normal temperatures, then in the vacuum drying oven of 80oC dry 48h with
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
By prepared mixed substrate membrane containing nano-grade molecular sieve in room temperature, pressure is to test CO under the dry conditions of 0.2MPa2, N2Gas oozes
Permeability energy, measures CO2Infiltration coefficient be 224Barrer, CO2/N2Selectivity is 30.
Embodiment 6：Prepare ZIF-8 account for matrix mass percent be 10wt% ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves, step
It is as follows：
Step 1: the preparation of ZIF-8：The zinc nitrate hexahydrate of 4mmol is dissolved in 100mL methanol solutions, the 2- first of 35mmol
Base imidazoles is also dissolved in 100mL methanol solutions, is then respectively put into 10g 4A molecular sieves and is stood the extra moisture of 10h removings,
Obtain the methanol solution of zinc nitrate hexahydrate（It is named as product A）With the methanol solution of 2-methylimidazole（It is named as product B）；So
Afterwards, product B and product A are poured into three-necked flask, stirs under 25oC and chemically react for 24 hours, exist to acquired solution
The rotating speed centrifugation 50min of 10000rpm, after the lower sediment in centrifuge tube is washed three times with methanol, is placed in 80oC vacuum drying ovens and does
It is dry for 24 hours to get white ZIF-8 powder；
Step 2: the preparation of casting solution：The polyether block amide of the ZIF-8 powder prepared in 0.6g step 1 and 6g is dissolved in
In the n,N-dimethylacetamide of 100mL, obtained solution C；By frequency of the solution C in 50kHz, the temperature ultrasound 4h at 40 °C,
Use again magnetic stirring apparatus rotating speed for 500rpm, temperature be 60oC stir 48h to form homogeneous casting solution to being completely dissolved（Name
For product D）, and it is for use for 24 hours in 25 °C of constant temperature deaerations；
Step 3: film preparation：The product D of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film
Spend for 200 μm, glass plate placement then made into solvent volatilization for 24 hours at normal temperatures, then in the vacuum drying oven of 60oC dry 48h with
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
By prepared mixed substrate membrane containing nano-grade molecular sieve in room temperature, pressure is to test CO under the dry conditions of 0.2MPa2, N2Gas oozes
Permeability energy, measures CO2Infiltration coefficient be 266Barrer, CO2/N2Selectivity is 34.
Embodiment 7：Prepare ZIF-8 account for matrix mass percent be 15wt% ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves, step
It is as follows：
Step 1: the preparation of ZIF-8：The zinc nitrate hexahydrate of 8mmol is dissolved in 100mL methanol solutions, the 2- first of 50mmol
Base imidazoles is also dissolved in 100mL methanol solutions, is then respectively put into 20g 4A molecular sieves standing and is removed extra moisture for 24 hours,
Obtain the methanol solution of zinc nitrate hexahydrate（It is named as product A）With the methanol solution of 2-methylimidazole（It is named as product B）；So
Afterwards, product B and product A are poured into three-necked flask, stirs under 25oC and chemically react for 24 hours, exist to acquired solution
The rotating speed centrifugation 20min of 12000rpm, after the lower sediment in centrifuge tube is washed three times with methanol, is placed in 60oC vacuum drying ovens and does
Dry 48h is to get white ZIF-8 powder；
Step 2: the preparation of casting solution：The polyether block amide of the ZIF-8 powder prepared in 0.9g step 1 and 6g is dissolved in
In the n,N-dimethylacetamide of 100mL, obtained solution C；By frequency of the solution C in 30kHz, the temperature ultrasound 2h at 20 °C,
Use again magnetic stirring apparatus rotating speed for 500rpm, temperature be 50oC stirring to form homogeneous casting solution to being completely dissolved for 24 hours（Name
For product D）, and it is for use in 25 °C of constant temperature deaeration 12h；
Step 3: film preparation：The product D of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film
Spend for 300 μm, glass plate placement then made into solvent volatilization for 24 hours at normal temperatures, then in the vacuum drying oven of 80oC dry 48h with
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
By prepared mixed substrate membrane containing nano-grade molecular sieve in room temperature, pressure is to test CO under the dry conditions of 0.2MPa2, N2Gas oozes
Permeability energy, measures CO2Infiltration coefficient be 272Barrer, CO2/N2Selectivity is 25.
Embodiment 8：Prepare ZIF-8 account for matrix mass percent be 20wt% ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves, step
It is as follows：
Step 1: the preparation of ZIF-8：The zinc nitrate hexahydrate of 4mmol is dissolved in 100mL methanol solutions, the 2- first of 35mmol
Base imidazoles is also dissolved in 100mL methanol solutions, is then respectively put into 10g 4A molecular sieves and is stood the extra moisture of 10h removings,
Obtain the methanol solution of zinc nitrate hexahydrate（It is named as product A）With the methanol solution of 2-methylimidazole（It is named as product B）；So
Afterwards, product B and product A are poured into three-necked flask, stirs under 25oC and chemically react for 24 hours, exist to acquired solution
The rotating speed centrifugation 50min of 10000rpm, after the lower sediment in centrifuge tube is washed three times with methanol, is placed in 80oC vacuum drying ovens and does
It is dry for 24 hours to get white ZIF-8 powder；
Step 2: the preparation of casting solution：The polyether block amide of the ZIF-8 powder prepared in 1.2g step 1 and 6g is dissolved in
In the n,N-dimethylacetamide of 100mL, obtained solution C；By frequency of the solution C in 30kHz, the temperature ultrasound 4h at 20 °C,
Use again magnetic stirring apparatus rotating speed for 300rpm, temperature be 80oC stir 48h to form homogeneous casting solution to being completely dissolved（Name
For product D）, and it is for use in 25 °C of constant temperature deaeration 12h；
Step 3: film preparation：The product D of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film
Spend for 200 μm, glass plate placement then made into solvent volatilization for 24 hours at normal temperatures, then in the vacuum drying oven of 50oC dry 48h with
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
By prepared mixed substrate membrane containing nano-grade molecular sieve in room temperature, pressure is to test CO under the dry conditions of 0.2MPa2, N2Gas oozes
Permeability energy, measures CO2Infiltration coefficient be 294Barrer, CO2/N2Selectivity is 21.
To sum up, in preparation process of the present invention, the addition of ZIF-8 and Zn/Ni-ZIF-8 make the CO of mixed substrate membrane containing nano-grade molecular sieve2Infiltration system
Number and CO2/N2The purer film of selectivity improves.And the permeability and separation performance of Zn/Ni-ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves is higher than
ZIF-8-PEBA mixed substrate membrane containing nano-grade molecular sieves.With the increase of Zn/Ni-ZIF-8 contents, film is to CO2Infiltration coefficient and CO2/N2Selectivity
First increase and reduce afterwards, optimal content of adding is 10wt%.In addition, with the rise of pressure, Zn/Ni-ZIF-8-PEBA mixed-matrixes
Film is to CO2Infiltration coefficient and CO2/N2Selectivity increase.
Although invention has been described above, the invention is not limited in above-mentioned specific embodiment, on
The specific embodiment stated is only schematical rather than restricted, and those of ordinary skill in the art are the present invention's
Under enlightenment, without deviating from the spirit of the invention, many variations can also be made, these belong to the present invention protection it
It is interior.
Claims (8)
1. a kind of polyether block amide gas separation membrane for adulterating zeolite imidazole ester, it is characterised in that：Solvent-thermal method is used first
Zeolite imidazole ester material is prepared, the polyether block amide gas of doping zeolite imidazole ester is then prepared using dry method phase inversion
Body seperation film；Prepared film is homogeneous membrane, and isolation medium is polyether-polyamide block copolymer, and additive is zeolite imidazole
Ester material, wet-film thickness are controlled at 50 ~ 500 μm.
2. the polyether block amide gas separation membrane of doping zeolite imidazole ester according to claim 1, it is characterised in that：Institute
Zeolite imidazole ester material is stated as ZIF-8 or Zn/Ni-ZIF-8, addition content is 5~20wt%.
3. the polyether block amide gas separation membrane of doping zeolite imidazole ester according to claim 1, it is characterised in that：Institute
The grain size of ZIF-8 materials is stated as 45 ~ 55nm, the grain size of Zn/Ni-ZIF-8 is 38 ~ 46nm.
4. a kind of preparation of the polyether block amide gas separation membrane of claim 1 ~ 3 any one of them doping zeolite imidazole ester
Method, it is characterised in that comprise the following steps：
Step 1: the preparation of ZIF-8：
Zinc nitrate hexahydrate is dissolved in the solution for being made into that concentration is 0.01 ~ 0.1mol/L in methanol solution, by 2-methylimidazole
Be dissolved in be made into 100mL methanol solutions concentration be 0.04 ~ 7mol/L solution, be then respectively put into 4A molecular sieves stand 6 ~
For 24 hours, extra moisture is removed, respectively obtains the methanol solution of zinc nitrate hexahydrate and the methanol solution of 2-methylimidazole, six water
The methanol solution for closing zinc nitrate is named as product A；The methanol solution of 2-methylimidazole is named as product B；Then, by product B and
Product A is poured into three-necked flask, and 12 ~ 48h is stirred under 20 ~ 80oC and is chemically reacted, to acquired solution 8000 ~
10 ~ 120min of centrifugation in the range of speeds of 12000rpm after the lower sediment in centrifuge tube is washed three times with methanol, is placed on 60 ~ 100
Dry 12 in oC vacuum drying ovens ~ for 24 hours to get the ZIF-8 powder of white；
The molar ratio of zinc nitrate hexahydrate and 2-methylimidazole is 1 ~ 10:4~700；5 ~ 30g 4A are used per 100mL methanol solutions
Molecular sieve；
Step 2: the preparation of casting solution：
Polyether block amide is dissolved in the solution that 30 ~ 200g/L is made into n,N-dimethylacetamide, with being prepared in step 1
ZIF-8 powder mixing, obtained solution C；By solution C 0.5 ~ 4h of ultrasonic disperse, then use magnetic stirring apparatus rotating speed for 100 ~
500rpm, temperature to form homogeneous casting solution for 12 ~ 48h of stirring in 20 ~ 90oC to being completely dissolved, and are named as product D, and at 25 °C
Constant temperature deaeration 12 ~ for use for 24 hours；
The mass ratio of polyether block amide and ZIF-8 powder is 3 ~ 20：0.15~5；
Step 3: film preparation：
The product D of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film as 50 ~ 500 μm, so
Glass plate placement is made into solvent 24 ~ 48h of volatilization at normal temperatures afterwards, then 24 ~ 48h is dried to remove in the vacuum drying oven of 40 ~ 90oC
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
5. the preparation method of the polyether block amide gas separation membrane of doping zeolite imidazole ester according to claim 4,
It is characterized in that：In step 2, supersonic frequency is 20 ~ 50kHz, and ultrasonic temperature is 20 ~ 70 °C；Gather in the casting solution that step 2 is prepared
The solid content of ether block amides is 3 ~ 25wt%, and the mass percent that ZIF-8 powder accounts for polyether block amide is 5~20wt%.
6. a kind of preparation of the polyether block amide gas separation membrane of claim 1 ~ 3 any one of them doping zeolite imidazole ester
Method, it is characterised in that comprise the following steps：
Step 1: the preparation of Zn/Ni-ZIF-8：
Zinc nitrate hexahydrate, Nickelous nitrate hexahydrate, 2-methylimidazole are dissolved in respectively in methanol solution and are configured to concentration difference
For 0.01 ~ 0.1mol/L, 0.01 ~ 0.1mol/L, 0.08 ~ 12mol/L solution, be then respectively put into 4A molecular sieves stand 6 ~
Extra moisture is removed for 24 hours, obtains the methanol solution of zinc nitrate hexahydrate, the methanol solution of Nickelous nitrate hexahydrate and 2- methyl miaows
The methanol solution of azoles；The methanol solution of zinc nitrate hexahydrate is named as product E, the methanol solution of Nickelous nitrate hexahydrate is named as production
Object F, the methanol solution of 2-methylimidazole are named as product G；Then, product E, product F and product G are poured into three-necked flask,
It stirs 12 ~ 48h under 20 ~ 80oC to chemically react, the centrifugation 10 in the range of speeds of 8000 ~ 12000rpm to acquired solution
~ 120min, after the lower sediment in centrifuge tube is washed three times with methanol, dry 12 are placed in 60 ~ 100oC vacuum drying ovens ~ for 24 hours, i.e.,
Obtain the Zn/Ni-ZIF-8 powder of purple；
Wherein, the zinc nitrate hexahydrate, Nickelous nitrate hexahydrate, the molar ratio of 2-methylimidazole are 1 ~ 10：1~10：8~1200；
5 ~ 30g 4A molecular sieves are used per 100mL methanol solutions；
Step 2: the preparation of casting solution：
Polyether block amide is dissolved in be made into n,N-dimethylacetamide concentration be 30 ~ 200g/L solution, then with step
The Zn/Ni-ZIF-8 powder mixing prepared in rapid one, 0.5 ~ 4h of ultrasonic disperse, then use magnetic stirring apparatus rotating speed for 100 ~
500rpm scopes, temperature to form homogeneous casting solution for 12 ~ 48h of stirring in the range of 20 ~ 90oC to being completely dissolved, and are named as product H,
It is and for use in 25 °C of constant temperature deaerations 12 ~ for 24 hours；
Wherein, the mass ratio of polyether block amide and Zn/Ni-ZIF-8 powder is 3 ~ 20：0.15~5；
Step 3: film preparation：
The product H of step 2 is uniformly scraped with scraper on clean glass plate, controls the thickness of wet film as 50 ~ 500 μm, so
Glass plate placement is made into solvent 24 ~ 48h of volatilization at normal temperatures afterwards, then 24 ~ 48h is dried to remove in the vacuum drying oven of 40 ~ 90oC
Remove residual solvent；Film after removal solvent is taken off from glass plate, keeps properly for use.
7. the preparation method of the polyether block amide gas separation membrane of doping zeolite imidazole ester according to claim 6,
It is characterized in that：In step 2, the frequency of ultrasonic disperse is 20 ~ 50kHz, and ultrasonic temperature is 20 ~ 70 °C；The casting film that step 2 is prepared
Ensure the solid content of polyether block amide in liquid as 3 ~ 25wt%, Zn/Ni-ZIF-8 powder accounts for the quality percentage of polyether block amide
Than for 5~20wt%.
8. a kind of polyether block amide gas separation membrane of claim 1 ~ 3 any one of them doping zeolite imidazole ester is separating
CO2Application in gas, it is characterised in that：Obtained film is used to separate CO2And N2, the test of gas permeability is using permanent
Buckling volumetric method, the effective area of film infiltration is 1 ~ 12.56cm2, scavenging is using H2, scavenging flow velocity is 10~60mL min-1, into
Material gas velocity is 10~60mL min-1, the flow of feed side and per-meate side measures with soap film flowmeter, and per-meate side constituent content is used
Gas-chromatography measures；Test temperature is room temperature, and pressure difference is 0.1~0.8MPa.
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