CN106823828A - A kind of synthetic method of molecular screen membrane - Google Patents
A kind of synthetic method of molecular screen membrane Download PDFInfo
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- CN106823828A CN106823828A CN201710094924.6A CN201710094924A CN106823828A CN 106823828 A CN106823828 A CN 106823828A CN 201710094924 A CN201710094924 A CN 201710094924A CN 106823828 A CN106823828 A CN 106823828A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0039—Inorganic membrane manufacture
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0039—Inorganic membrane manufacture
- B01D67/0067—Inorganic membrane manufacture by carbonisation or pyrolysis
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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
- B01D71/02—Inorganic material
- B01D71/028—Molecular sieves
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Abstract
The invention discloses a kind of synthetic method of molecular screen membrane, by synthesizing one layer of crystal layer of sigma 1 on carrier, then DD3R crystal layers are synthesized thereon so as to synthesize molecular screen membrane, the molecular screen membrane prepared using the method is not likely to produce other types crystal, the degree of purity of molecular screen membrane crystal is maintained, permeance property is improve.
Description
Technical field
The application is related to a kind of synthetic method of film, more particularly to a kind of synthetic method of molecular screen membrane.
Background technology
Organic solvent plays very important effect in modern industry, can be used for medicine, chemical industry, material, metallurgy etc. all
It is multi-field.In some application scenarios, the purity requirement to organic solvent is harsher, for example, require that organic solvent purity exists
More than 99.99%, and water is one of common dopant type in organic solvent, it is because itself and some organic solvents dissolve each other therefore de-
Water seems particularly significant in product purification.
In existing dehydration of organic solvent technique, infiltration evaporation is a kind of ideal technique, and it has, and energy consumption is low, work
Many advantages, such as skill is simple.And for infiltration evaporation technique, infiltrating and vaporizing membrane is the key factor in infiltration evaporation technique.
And existing infiltrating and vaporizing membrane includes organic film and the class of inoranic membrane two substantially, and molecular screen membrane is common inorganic infiltrating and vaporizing membrane
Type, receives many concerns the features such as because of its Stability Analysis of Structures.
According to the difference of crystalline texture, molecular sieve has a different configurations, such as LTA, MFI, MOR, AFI, FER, FAU,
DDR etc..DDR is the crystallization that main component is made up of silica, and its micropore is formed by the polyhedron containing aerobic 8 yuan of rings, while
The micropore diameter of the yuan of rings of oxygen 8 is 4.4 × 3.6 angstroms.Because the skeleton structure of its intimate total silicon and suitable pore diameter range, DDR molecules
Sieve membrane ought to turn into a kind of one of huge molecular screen membrane species of application potential.DD3R is a kind of molecule of common DDR configurations
Sieve, has had many synthetic methods on DD3R molecular screen membranes in the prior art, but at present, its industrial applications is less,
The reason for excluding synthetic method complexity, it is mainly due to film and other types crystal is easily produced in crystallization process, special
It is not SGT.The appearance of other types crystal can seriously reduce the performance of film, so as to have impact on its application.
Based on prior art and experience, the appearance of other kinds of crystal is often caused by the later half of molecular screen membrane crystallization
Section, that is to say, that the possibility for occurring stray crystal in the crystallization time of front half section is smaller.But if using the crystalline substance of short time
Change, molecular screen membrane film layer is relatively thin, it is difficult to ensure its permeance property.
The content of the invention
Occur other types crystal in crystallization process to solve molecular screen membrane, closed the invention provides a kind of molecular screen membrane
Into method.
Technical scheme is as follows：
A kind of synthetic method of molecular screen membrane, it is characterised in that comprise the following steps：
（1）Carrier is soaked in deionized water, is dried with standby.Carrier is soaked in deionized water can effectively be removed
Impurity in carrier is influenceing subsequent film crystallization.
（2）By, to prepare crystal seed coating liquid, the wherein quality of sigma-1 is divided in sigma-1 sieve particles addition ethanol
It is 1-10% to count, and ultrasound, stir process.It is in the prior art to be placed in water crystal seed liquid to prepare crystal seed coating liquid, and this hair
The bright way that discards tradition, according to the inherently characteristic of sigma-1 crystal, creative be placed in crystal seed prepares crystal seed in ethanol
Coating liquid, as a result finds the molecular screen membrane prepared using same sigma-1 crystal, same concentration, in selectivity and infiltration
Flux aspect, the film prepared as crystal seed coating liquid using ethanol is far better than use water as retarder thinner.Preferably,
A certain amount of boehmite sol is added in crystal seed coating liquid can lift adhesion of the crystal seed on carrier as adhesive.
（3）Crystal seed liquid is coated in carrier outer surface, is repeated 1-5 times, drying prepares inoculation carrier.
（4）With amantadine：Silica：Ethylenediamine：Aluminum oxide：NaOH：Water mol ratio is 10:60:180： 2:
3:6000 proportions preparation liquid A.Not yet there is the preparation liquid for preparing sigma-1 films to match in the prior art, the present invention is first
To be matched as preparation liquid after the proportioning dilution of synthesis sigma-1 crystal in the prior art, and the proportioning of amantadine is carried out
Reduce, and experiment has been carried out to specific extension rate and attempt, so as to create optimal proportioning, the proportioning is relative to preparation
The proportioning of crystal, reduces the consumption of template, improves economy.
（5）Inoculation carrier is placed in film forming kettle, pours into preparation liquid A to be totally submerged inoculation carrier.
（6）The crystallization at a temperature of 180 DEG C, crystallization time is 12-24h to prepare molecular screen membrane base substrate A.Sigma-1 crystal
The optimum crystallization temperature of layer is 180 DEG C, according to the temperature, and has carried out multiple trial to specific crystallization time, is as a result found,
Crystallization time 12-24h is optimal, and preferably 16h-18h, crystallization time is too short, and film layer is too thin, along with brilliant subsequently than relatively thin DD3R
Body layer, permeance property cannot be ensured, and if crystallization time is long, film layer is thicker, along with follow-up DD3R crystal layers, be held
Crack easily is produced in follow-up film layer roasting process, so as to reduce permeance property.
（7）Molecular screen membrane base substrate A deionized water rinsings after crystallization is terminated, surface p H close to neutrality is dipped to, and
Dry for standby.
（8）With amantadine：Silica：Ethylenediamine：Water mol ratio is 9:100:150:4000 molar ratio system
Film liquid B.
（9）Molecular screen membrane base substrate A is placed in film forming kettle, pours into preparation liquid A to be totally submerged molecular screen membrane base substrate A；
（10）The crystallization at a temperature of 160 DEG C, crystallization time is 8-24h to prepare molecular screen membrane base substrate B.It is thick in sigma-1 film layers
The certain condition of degree, it is ensured that the thickness of DD3R film layers is most important, through investigation, optimal crystallization time is 8-24h, preferably 8-
12h, too short crystallization time easily produces defect, it is impossible to which sigma-1 layers is completely covered for guarantee, loses the excellent of top layer total silicon
Non-defective unit matter, and other types crystal easily is produced on surface, so as to can not guarantee the degree of purity of film layer, reduce the infiltration of film layer
Performance.
（11）Molecular screen membrane base substrate B deionized water rinsings after crystallization is terminated, surface p H close to neutrality is dipped to, and
Drying.
（12）By the molecular screen membrane base substrate B after drying in high-temperature roasting kiln roasting removing amantadine so as to prepare point
Sub- sieve membrane.
Preferably, carrier is chip, tubular type or hollow fiber form.
Preferably, the compound method of the preparation liquid A is：During amantadine and ethylenediamine sequentially added into container, ultrasound
Treatment 20-30min is so that amantadine is completely dissolved, and continues to add sodium metaaluminate, NaOH in the case where ultrasound condition is heated
And water, and continual ultrasonic 30-60min, wherein ultrasonic temperature are 40-60 DEG C.On the basis of traditional sigma-1 Opacity in lens liquid
It is optimized treatment.
Preferably, the compound method of the preparation liquid B is：During amantadine and ethylenediamine sequentially added into container, ultrasound
Treatment 20-30min is so that amantadine is completely dissolved, and continuation adds water in the case where ultrasound condition is heated, and continual ultrasonic 30-
60min, wherein ultrasonic temperature are 60 DEG C, and solution is cooled down in frozen water, and ultrasonically treated 30- is continued after addition silica
60min.Traditional synthetic method needs 90 degrees Celsius of high temperature oil bath, and present invention only requires 60 DEG C of common water-bath, simplifies
Experiment condition, but increased the success rate of film crystallization on the contrary.
Preferably, described to be roasted to stage roasting, actual conditions is：During -300 DEG C of room temperature intensification frequency be 2 DEG C/
Intensification frequency is 1 DEG C/min when min, 300-600 DEG C, is 0.5 DEG C/min at 600-700 DEG C, and 2-4h, 700- are maintained at 700 DEG C
Frequency of lowering the temperature at 300 DEG C is 1 DEG C/min, and 300- room temperatures are 2 DEG C/min.It is that the film is difficult to greatly that crack easily occurs in such DDR film
One of the reason for sizable application.But based on to DD3R and sigma-1 research find, sigma-1 do film forming layer relative to
Do not allow to be also easy to produce defect for DD3R, and due to the hot coefficient similar of sigma-1 and DD3R, therefore, loaded on sigma-1 layers
DD3R, also reduces the probability that DD3R produces defect.On this basis, it is that at utmost ensure that defect produces probability, but it is right
Innovated in the baking modes of film, and proposed stage baking modes, make defect produce probability to fall below minimum.
The molecular screen membrane prepared by the above method, it has sigma-1 crystal layers and DD3R crystal layers, wherein sigma-
The thickness of 1 crystal layer is 1-1.3 μm, and silica alumina ratio is 20-40, and the thickness of DD3R crystal layers is 0.5-0.8 μm, and silica alumina ratio is at least
10000.And in terms of permeance property, at being 60 DEG C in feeding temperature, ethanol mass concentration is 50% material in ethanol/water system
In liquid, the molecular screen membrane separation factor prepared using the present invention is more than 1000, and flux is more than 3kg/m3.h。
The present invention is compared compared with the prior art, with advantages below：
1. the present invention has synthesized one layer of sigma-1 crystal layer between traditional DD3R films and carrier, due to sigma-1 crystal
The presence of layer, DD3R films only need shorter crystallization time, therefore its film layer other types crystal is less, and due to sigma-
1 film easily keeps the clarity of crystal, therefore whole molecular screen membrane crystal clarity is higher.And due to sigma-1 and DD3R apertures
It is similar, the permeance property of film layer is can guarantee that again.
2. in the molecular screen membrane that prepared by the present invention, because sigma-1 crystal layers are located between DD3R crystal layers and carrier,
Sigma-1 crystal layers will not be contacted with solvent in crystallization process, maintain the good characteristic of the intimate total silicon of film surface.
Specific embodiment
Embodiment 1
（1）By homemade Alpha-alumina (d50=0.80 μm) chip carrier is placed in baking oven after soaking 6h in deionized water
Dried with standby at 60 DEG C.
（2）By sigma-1 sieve particles（About 800nm）Add in ethanol preparing crystal seed coating liquid, wherein sigma-1
Mass fraction be 2%, and add a certain amount of adhesive boehmite sol, magnetic agitation treatment 10min after ultrasonic 5min.
（3）Crystal seed layer is coated on carrier 1 time, continue with leaching Tu method and crystal seed 2 is coated on carrier first with spin-coating method
It is secondary, dried at 60 DEG C and prepare inoculation carrier.
（4）During 10g amantadines and ethylenediamine sequentially added into container, ultrasonically treated 20min is so that amantadine is complete
Dissolving, and continue to add sodium metaaluminate 1g, NaOH 1g and water 500g successively under heating ultrasound condition at 60 DEG C, and persistently surpass
Sound 30min, is finally added dropwise Ludox 79.2g to prepare preparation liquid A.
（5）Inoculation carrier is placed in chip film film forming kettle, crystal seed layer down, pours into preparation liquid A to be totally submerged inoculation
Carrier.
（6）The crystallization at a temperature of 180 DEG C, crystallization time is 16h to prepare molecular screen membrane base substrate A.
（7）Molecular screen membrane base substrate A deionized water rinsings after crystallization is terminated, surface p H close to neutrality is dipped to, and
Dry for standby.
（8）During 10g amantadines and 66.96g ethylenediamines sequentially added into container, ultrasonically treated 20min is so that adamantane
Amine is completely dissolved, and continues to add water 535g under heating ultrasound condition at 60 DEG C, and continual ultrasonic 30min, and solution is placed in into ice
Cooled down in aqueous mixtures, and addition Ludox 148g in the cooling condition.Heating ultrasound 30min obtains casting solution B again.
（9）Molecular screen membrane base substrate B is placed in film forming kettle, pours into preparation liquid B to be totally submerged molecular screen membrane base substrate A.
（10）The crystallization at a temperature of 160 DEG C, crystallization time is 12h to prepare molecular screen membrane base substrate B.
（11）Molecular screen membrane base substrate B deionized water rinsings after crystallization is terminated, surface p H close to neutrality is dipped to, and
Drying.
（12）By the molecular screen membrane base substrate B after drying in high-temperature roasting kiln roasting removing amantadine so as to prepare point
Sub- sieve membrane.
Embodiment 2
（1）By homemade Alpha-alumina tubular media (d50=1.2 μm) in deionized water immersion 8h after be placed in baking oven 60
Dried with standby at DEG C.
（2）By sigma-1 sieve particles（About 800nm）Add in ethanol preparing crystal seed coating liquid, wherein sigma-1
Mass fraction be 2%, and add a certain amount of adhesive boehmite sol, magnetic agitation treatment 10min after ultrasonic 5min.
（3）Crystal seed is coated on carrier 2 times, every time lasting 5s, dried at 60 DEG C and prepare inoculation carrier using dip-coating.
（4）During 10g amantadines and ethylenediamine sequentially added into container, ultrasonically treated 20min is so that amantadine is complete
Dissolving, and continue to add sodium metaaluminate 1g, NaOH 1g and water 500g successively under heating ultrasound condition at 60 DEG C, and persistently surpass
Sound 30min, is finally added dropwise Ludox 79.2g to prepare casting solution A.
（5）Inoculation carrier is placed in tubular membrane film forming kettle, pours into preparation liquid A to be totally submerged inoculation carrier.
（6）The crystallization at a temperature of 180 DEG C, crystallization time is 12h to prepare molecular screen membrane base substrate A;
（7）Molecular screen membrane base substrate A deionized water rinsings after crystallization is terminated, surface p H close to neutrality is dipped to, and dried
It is standby；
（8）During 10g amantadines and ethylenediamine sequentially added into container, ultrasonically treated 20min so that amantadine is completely dissolved,
And continue to add water 500g under heating ultrasound condition at 60 DEG C, and continual ultrasonic 30min, solution is placed in cold in mixture of ice and water
But, Ludox and is added in the cooling condition.Heating ultrasound 30min obtains casting solution B again.
（9）Molecular screen membrane base substrate A is placed in film forming kettle, pours into preparation liquid B to be totally submerged molecular screen membrane base substrate A；
（10）The crystallization at a temperature of 160 DEG C, crystallization time is 12h to prepare molecular screen membrane base substrate B;
（11）Molecular screen membrane base substrate B deionized water rinsings after crystallization is terminated, surface p H close to neutrality is dipped to, and dried
It is dry.
（12）By the molecular screen membrane base substrate B after drying in high-temperature roasting kiln roasting removing amantadine so as to prepare point
Sub- sieve membrane.
At molecular screen membrane prepared by embodiment 1,2 is 60 DEG C in feeding temperature, ethanol mass concentration in ethanol/water system
To carry out infiltration evaporation experiment in 50% feed liquid, molecular screen membrane separation factor prepared by embodiment 1 is 5000, and flux is 3kg/
m3.h, and embodiment 2 prepare molecular screen membrane separation factor be 3500, flux is 4.53kg/m3.h。
Highly preferred embodiment of the present invention is the foregoing is only, is not intended to limit the invention.It is all in principle of the invention and
Any modification, equivalent substitution and improvements done within spirit etc., should be included within the scope of the present invention.
Claims (5)
1. a kind of synthetic method of molecular screen membrane, it is characterised in that comprise the following steps：
（1）Carrier is soaked in deionized water, is dried with standby；
（2）By, to prepare crystal seed coating liquid, the wherein mass fraction of sigma-1 is in sigma-1 sieve particles addition ethanol
1-10%, and ultrasound, stir process；
（3）Crystal seed liquid is coated in carrier outer surface, is repeated 1-5 times, drying prepares inoculation carrier；
（4）With amantadine：Silica：Ethylenediamine：Aluminum oxide：NaOH：Water mol ratio is 10:60:180：2: 3:
6000 proportions preparation liquid A；
（5）Inoculation carrier is placed in film forming kettle, pours into preparation liquid A to be totally submerged inoculation carrier；
（6）The crystallization at a temperature of 180 DEG C, crystallization time is 12-36h to prepare molecular screen membrane base substrate A;
（7）Molecular screen membrane base substrate A deionized water rinsings after crystallization is terminated, surface p H close to neutrality is dipped to, and dried
It is standby；
（8）With amantadine：Silica：Ethylenediamine：Water mol ratio is 9:100:150:4000 molar ratio preparation liquid
B；
（9）Molecular screen membrane base substrate A is placed in film forming kettle, pours into preparation liquid A to be totally submerged molecular screen membrane base substrate A；
（10）The crystallization at a temperature of 160 DEG C, crystallization time is 8-24h to prepare molecular screen membrane base substrate B;
（11）Molecular screen membrane base substrate B deionized water rinsings after crystallization is terminated, surface p H close to neutrality is dipped to, and dried
It is dry；
（12）By the molecular screen membrane base substrate B after drying in high-temperature roasting kiln roasting removing amantadine so as to prepare molecule
Sieve membrane.
2. synthetic method according to claim 1, it is characterised in that described carrier is chip, tubular type or doughnut
Formula.
3. synthetic method according to claim 1, it is characterised in that the compound method of the preparation liquid A is：By adamantane
Amine and ethylenediamine are sequentially added in container, and ultrasonically treated 20-30min is so that amantadine is completely dissolved, and continues super in heating
Sodium metaaluminate, NaOH and water are added under the conditions of sound, and continual ultrasonic 30-60min, wherein ultrasonic temperature are 40-60 DEG C.
4. synthetic method according to claim 1, it is characterised in that the compound method of the preparation liquid B is：By adamantane
Amine and ethylenediamine are sequentially added in container, and ultrasonically treated 20-30min is so that amantadine is completely dissolved, and continues super in heating
Added water under the conditions of sound, and continual ultrasonic 30-60min, wherein ultrasonic temperature are 60 DEG C, and solution is cooled down in frozen water and added two
Continue ultrasonically treated 30-60min after silica.
5. synthetic method according to claim 1, it is characterised in that described is roasted to stage roasting, actual conditions
It is：Intensification frequency is 2 DEG C/min during -300 DEG C of room temperature, and intensification frequency is 1 DEG C/min at 300-600 DEG C, is at 600-700 DEG C
0.5 DEG C/min, 2-4h is maintained at 700 DEG C, frequency of lowering the temperature at 700-300 DEG C is 1 DEG C/min, 300- room temperatures are 2 DEG C/min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108211821A (en) * | 2017-09-24 | 2018-06-29 | 韩小学 | A kind of preparation method of high throughput molecular screen membrane |
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| US6533855B1 (en) * | 2001-02-13 | 2003-03-18 | Novellus Systems, Inc. | Dispersions of silicalite and zeolite nanoparticles in nonpolar solvents |
| CN102247767A (en) * | 2011-04-19 | 2011-11-23 | 南京工业大学 | Preparation method for preparing NaA molecular sieve membrane by induction of nano seed crystal |
| CN105016354A (en) * | 2015-07-03 | 2015-11-04 | 中国科学院上海高等研究院 | Method for preparing submicron all-silicon DD3R molecular sieve |
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2017
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Patent Citations (3)
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| US6533855B1 (en) * | 2001-02-13 | 2003-03-18 | Novellus Systems, Inc. | Dispersions of silicalite and zeolite nanoparticles in nonpolar solvents |
| CN102247767A (en) * | 2011-04-19 | 2011-11-23 | 南京工业大学 | Preparation method for preparing NaA molecular sieve membrane by induction of nano seed crystal |
| CN105016354A (en) * | 2015-07-03 | 2015-11-04 | 中国科学院上海高等研究院 | Method for preparing submicron all-silicon DD3R molecular sieve |
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| CN108211821A (en) * | 2017-09-24 | 2018-06-29 | 韩小学 | A kind of preparation method of high throughput molecular screen membrane |
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