CN111871219B - Preparation method of inorganic reverse osmosis membrane for water treatment - Google Patents
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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
- B01D67/0044—Inorganic membrane manufacture by chemical reaction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
- B01D61/025—Reverse osmosis; Hyperfiltration
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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
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
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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
- B01D67/0081—After-treatment of organic or inorganic membranes
- B01D67/0095—Drying
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/12—Composite membranes; Ultra-thin membranes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
The invention provides a preparation method of an inorganic reverse osmosis membrane for water treatment, which is characterized in that a separation layer is divided into a relatively loose layer and a relatively compact layer, so that the water flux of the inorganic reverse osmosis membrane can be obviously improved on the basis of ensuring the desalination rate of a membrane material under the condition of the same membrane thickness, and the subsequent industrial application is facilitated.
Description
Technical Field
The invention relates to a preparation method of a reverse osmosis membrane, in particular to a preparation method of a zeolite-based reverse osmosis membrane.
Background
In the world today, water resource problems including water pollution and water shortage are becoming more and more serious, and they are receiving high attention from global researchers and even the general public. Among a plurality of water treatment technologies, the reverse osmosis technology is gradually expanded from seawater desalination to the fields of wastewater treatment, municipal water recycling and the like, and more attention is paid to the reverse osmosis technology. With the development of reverse osmosis technology, membrane materials gradually become a bottleneck restricting reverse osmosis application.
In the prior art, the preparation of reverse osmosis membranes is mainly concentrated on materials such as polyamide and cellulose, which are all organic materials and are increasingly restricted by specific environments in the application process. Accordingly, inorganic reverse osmosis membranes, particularly zeolite-based reverse osmosis membranes, have been proposed and developed to a certain extent by researchers. The molecular sieve has a specific pore structure and uniform pore size, so that the molecular sieve has the potential of improving reverse osmosis flux and interception performance. In addition, the inorganic film is superior to the organic film in stability, heat resistance, and the like. However, the reverse osmosis membrane is limited to the laboratory research stage, and there is no industrial application example, one reason is that the separation layer is usually required to be made thicker to ensure the selectivity of the membrane, and the flux is reduced as a result of the improvement of the selectivity, so that the reverse osmosis membrane is not accepted by the market at present. Therefore, aiming at the technical problem of improving the small flux of the zeolite-based reverse osmosis membrane on the basis of ensuring the separation selectivity, a new technology is urgently needed to improve the flux.
Disclosure of Invention
In order to solve the problems, the invention provides a novel method for preparing the inorganic reverse osmosis membrane for water treatment, and compared with the inorganic reverse osmosis membrane prepared by the traditional method, the flux of the reverse osmosis membrane prepared by the method is obviously improved.
The invention provides a preparation method of an inorganic reverse osmosis membrane for water treatment, which comprises a support layer, a relatively loose layer and a relatively compact layer which are sequentially connected, and the preparation method comprises the following steps:
(1) pretreatment of a carrier: polishing a carrier by using sand paper, soaking the carrier in treated water, acid, alkali and deionized water respectively, ultrasonically drying the carrier, and roasting the carrier in a muffle furnace to remove organic matters;
(2) preparation of a relatively loose layer: preparation in a molar ratio of
a1SiO 2 :b1Al 2 O 3 :c1Na 2 O:d1H 2 Soaking the pretreated carrier in the first membrane casting solution, performing static hydrothermal synthesis for 5-6h at a first synthesis temperature, and cleaning, soaking and drying to obtain a primary membrane;
(3) post-treatment of the relatively loose layer: dipping the primary membrane obtained in the step (2) in an acid solution for 3-5s, repeating for 2-3 times, and cleaning with deionized water;
(4) preparation of relatively dense layer: preparation of a2SiO 2 :b2Al 2 O 3 :c2Na 2 O:d2H 2 And (3) soaking the primary membrane processed in the step (3) in a second membrane casting solution of O, e2TMAOH, performing dynamic hydrothermal synthesis at a second synthesis temperature for 3-4h, and cleaning, soaking and drying to obtain the inorganic reverse osmosis membrane.
Wherein, in the first casting solution, a1 is 4-6, b1 is 1-4, c1 is 3-10, d1 is 200-2000, d1/c1 is more than 50, preferably 60 is not less than d1/c1 is not more than 100.
Wherein, in the second membrane casting solution, a2 is 4-6, b2 is 0.5-2, C2 is 40-80, d2 is 800-5000, e2 is 0.5-2, wherein d2/C2 is less than 40, preferably 30 ≥ d2/C2 ≥ 10.
Wherein, the sand paper adopted in the step (1) is 400-1500 meshes, the acid is 1-2M hydrochloric acid, and the alkali is 1-2M sodium hydroxide.
Wherein the first synthesis temperature is 50-60 ℃, and the second synthesis temperature is 70-90 ℃.
Wherein, the carrier is tubular and hollow fiber type.
Wherein, the carrier material is alumina or metal material.
Wherein, the dynamic synthesis is that the whole synthesis kettle is in a rotating state, and the rotating speed is 5-15 circles/minute.
Wherein the acidic solution in the step (3) is 4-5M hydrochloric acid.
The main idea for solving the problems is to divide a separation layer into a relatively loose layer and a relatively compact layer, wherein the relatively loose layer is prepared by an in-situ hydrothermal method, the zeolite framework is partially dealuminated through acid treatment so as to be favorable for being used as a binding site to induce 'nutrient substance' crystallization, and tetramethylammonium hydroxide is added in the second crystallization process so as to be used as a template agent, so that the second crystallization phase has more induction factors for the first crystallization, and the second crystallization is more compact than the first crystallization.
Since the framework structure of the zeolite is definite, the "loose" and "dense" proposed in the present invention refer to the crosslinkability between the zeolites. Unlike zeolite membranes for pervaporation or gas separation, the porous layer of the present invention has inter-crystal pore defects, which contribute to improved flux of the reverse osmosis membrane, and has a certain separation capacity. Of course, both meso-porous defects and macro-porous defects are disadvantageous, and therefore, the present invention optimizes the composition and content of the first/second dope solution to ensure that the "relatively loose layer" is limited to only loose as micro-porous defects and dense as "relatively dense layer" has no defects. Based on the above, under the condition that the film thickness is basically consistent, the relatively dense layer ensures that the separation selectivity of the film is not reduced, and the relatively loose layer improves the flux of the film and is promoted.
Detailed Description
Embodiments of the present application will be described in detail by examples, so that how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.
The raw materials and equipment used in the present application are all common raw materials and equipment in the field, and are all from commercially available products, unless otherwise specified. The methods used in this application are conventional in the art unless otherwise indicated.
Example 1
(1) Polishing a tubular carrier made of an alumina material by 1500-mesh abrasive paper, soaking and ultrasonically treating the tubular carrier by deionized water, ultrasonically treating the tubular carrier by a 1M hydrochloric acid solution, ultrasonically treating the tubular carrier by a 1M sodium hydroxide solution, soaking and ultrasonically treating the tubular carrier by the deionized water, then drying the tubular carrier in a 60 ℃ drying oven, roasting the tubular carrier in a muffle furnace at 550 ℃ to remove organic matters, wherein the lifting temperature is 1 ℃/min;
(2) preparation of 5SiO in molar ratio 2 :3Al 2 O 3 :7Na 2 O:500H 2 The first membrane casting solution of O, vertically dipping the pretreated carrier in the first membrane casting solution, carrying out static hydrothermal synthesis for 5 hours at 50 ℃, and cleaning, soaking and drying to obtain a primary membrane;
(3) dipping the primary membrane obtained in the step (2) in a 5M hydrochloric acid solution for 5s, repeating the dipping for 2 times, washing the primary membrane with deionized water to be neutral, and drying the primary membrane in an oven;
(4) preparation of 5SiO 2 :1Al 2 O 3 :50Na 2 O:950H 2 And (4) vertically soaking the primary membrane processed in the step (3) in a second membrane casting solution of O:1TMAOH, performing dynamic hydrothermal synthesis for 3 hours at 80 ℃, wherein the rotation speed of a synthesis kettle is 5 circles/minute, and cleaning, soaking and drying the membrane after the synthesis is finished to obtain the inorganic reverse osmosis membrane.
Comparative example 1
(1) Polishing a tubular carrier made of an alumina material by 1500-mesh abrasive paper, soaking and ultrasonically treating the tubular carrier by deionized water, ultrasonically treating the tubular carrier by a 1M hydrochloric acid solution, ultrasonically treating the tubular carrier by a 1M sodium hydroxide solution, soaking and ultrasonically treating the tubular carrier by the deionized water, then drying the tubular carrier in a 60 ℃ drying oven, roasting the tubular carrier in a muffle furnace at 550 ℃ to remove organic matters, wherein the lifting temperature is 1 ℃/min;
(2) preparation of 5SiO in molar ratio 2 :3Al 2 O 3 :7Na 2 O:500H 2 And O, vertically soaking the pretreated carrier in the first membrane casting solution, performing static hydrothermal synthesis at 50 ℃ for 5 hours, and cleaning, soaking and drying to obtain the inorganic reverse osmosis membrane.
Comparative example 2
(1) Polishing a tubular carrier made of an alumina material by 1500-mesh abrasive paper, soaking and ultrasonically treating the tubular carrier by deionized water, ultrasonically treating the tubular carrier by a 1M hydrochloric acid solution, ultrasonically treating the tubular carrier by a 1M sodium hydroxide solution, soaking and ultrasonically treating the tubular carrier by the deionized water, then drying the tubular carrier in a 60 ℃ drying oven, roasting the tubular carrier in a muffle furnace at 550 ℃ to remove organic matters, wherein the lifting temperature is 1 ℃/min;
(2) preparation of 5SiO 2 :1Al 2 O 3 :50Na 2 O:950H 2 And (4) vertically soaking the primary membrane after the treatment in the step (3) in a second membrane casting solution of O:1TMAOH, performing dynamic hydrothermal synthesis for 3 hours at 80 ℃, wherein the rotation speed of a synthesis kettle is 5 circles/minute, and cleaning, soaking and drying the membrane after the synthesis is finished to obtain the inorganic reverse osmosis membrane.
Comparative example 3
(1) Polishing a tubular carrier made of an alumina material by 1500-mesh abrasive paper, soaking and ultrasonically treating the tubular carrier by deionized water, ultrasonically treating the tubular carrier by a 1M hydrochloric acid solution, ultrasonically treating the tubular carrier by a 1M sodium hydroxide solution, soaking and ultrasonically treating the tubular carrier by the deionized water, then drying the tubular carrier in a 60 ℃ drying oven, roasting the tubular carrier in a muffle furnace at 550 ℃ to remove organic matters, wherein the lifting temperature is 1 ℃/min;
(2) preparation of 5SiO in molar ratio 2 :1Al 2 O 3 :50Na 2 O:950H 2 The method comprises the following steps of (1) vertically soaking a pretreated carrier in a first membrane casting solution of O:1TMAOH, carrying out dynamic hydrothermal synthesis at 80 ℃ for 5 hours at a synthesis kettle rotating speed of 5 circles/minute, and cleaning, soaking and drying to obtain a primary membrane;
(3) dipping the primary membrane obtained in the step (2) in a 5M hydrochloric acid solution for 5s, repeating the dipping for 2 times, washing the primary membrane with deionized water to be neutral, and drying the primary membrane in an oven;
(4) preparation of 5SiO 2 :1Al 2 O 3 :50Na 2 O:950H 2 And (3) vertically soaking the primary membrane processed in the step (3) in the second membrane casting solution, performing dynamic hydrothermal synthesis at 80 ℃ for 3 hours at the rotating speed of a synthesis kettle of 5 circles/minute, and cleaning, soaking and drying the membrane after the synthesis is finished to obtain the inorganic reverse osmosis membrane.
Comparative example 4
(1) Polishing a tubular carrier made of an alumina material by 1500-mesh abrasive paper, soaking and ultrasonic treating the tubular carrier by deionized water, soaking and ultrasonic treating the tubular carrier by 1M hydrochloric acid solution, ultrasonic treating the tubular carrier by 1M sodium hydroxide solution and soaking and ultrasonic treating the tubular carrier by the deionized water, then placing the tubular carrier in a 60 ℃ drying oven for drying, and placing the tubular carrier in a muffle furnace for roasting at 550 ℃ to remove organic matters, wherein the lifting temperature is 1 ℃/min;
(2) preparation of 5SiO in molar ratio 2 :3Al 2 O 3 :7Na 2 O:500H 2 The first membrane casting solution of O, vertically dipping the pretreated carrier in the first membrane casting solution, carrying out static hydrothermal synthesis for 5 hours at 50 ℃, and cleaning, soaking and drying to obtain a primary membrane;
(3) preparation of 5SiO 2 :1Al 2 O 3 :50Na 2 O:950H 2 And (3) vertically soaking the primary membrane in the second membrane casting solution with the O:1TMAOH, performing dynamic hydrothermal synthesis at 80 ℃ for 3 hours at the rotation speed of a synthesis kettle of 5 circles/minute, and cleaning, soaking and drying the membrane after the synthesis is finished to obtain the inorganic reverse osmosis membrane.
Comparative example 5
(1) Polishing a tubular carrier made of an alumina material by 1500-mesh abrasive paper, soaking and ultrasonically treating the tubular carrier by deionized water, ultrasonically treating the tubular carrier by a 1M hydrochloric acid solution, ultrasonically treating the tubular carrier by a 1M sodium hydroxide solution, soaking and ultrasonically treating the tubular carrier by the deionized water, then drying the tubular carrier in a 60 ℃ drying oven, roasting the tubular carrier in a muffle furnace at 550 ℃ to remove organic matters, wherein the lifting temperature is 1 ℃/min;
(2) preparation of 5SiO in molar ratio 2 :3Al 2 O 3 :7Na 2 O:500H 2 The first membrane casting solution of O, vertically dipping the pretreated carrier in the first membrane casting solution, carrying out static hydrothermal synthesis for 5 hours at 50 ℃, and cleaning, soaking and drying to obtain a primary membrane;
(3) dipping the primary membrane obtained in the step (2) in a 5M hydrochloric acid solution for 5s, repeating the dipping for 2 times, washing the primary membrane with deionized water to be neutral, and drying the primary membrane in an oven;
(4) preparation of 5SiO 2 :1Al 2 O 3 :50Na 2 O:950H 2 O, the primary membrane processed after the step (3) is also verticalAnd (3) soaking the membrane in a second membrane casting solution, carrying out dynamic hydrothermal synthesis for 3 hours at the temperature of 80 ℃, wherein the rotating speed of a synthesis kettle is 5 circles/minute, and after the synthesis is finished, cleaning, soaking and drying the membrane to obtain the inorganic reverse osmosis membrane.
Comparative example 6
(1) Polishing a tubular carrier made of an alumina material by 1500-mesh abrasive paper, soaking and ultrasonic treating the tubular carrier by deionized water, soaking and ultrasonic treating the tubular carrier by 1M hydrochloric acid solution, ultrasonic treating the tubular carrier by 1M sodium hydroxide solution and soaking and ultrasonic treating the tubular carrier by the deionized water, then placing the tubular carrier in a 60 ℃ drying oven for drying, and placing the tubular carrier in a muffle furnace for roasting at 550 ℃ to remove organic matters, wherein the lifting temperature is 1 ℃/min;
(2) preparation of 5SiO in molar ratio 2 :3Al 2 O 3 :7Na 2 O:500H 2 The first membrane casting solution of O, the pretreated carrier is vertically immersed in the first membrane casting solution, static hydrothermal synthesis is carried out for 5 hours at 50 ℃, and a primary membrane is obtained by cleaning, soaking and drying;
(3) dipping the primary membrane obtained in the step (2) in a 5M hydrochloric acid solution for 5s, repeating the dipping for 2 times, washing the primary membrane with deionized water to be neutral, and drying the primary membrane in an oven;
(4) preparation of 5SiO 2 :1Al 2 O 3 :50Na 2 O:950H 2 And (4) vertically soaking the primary membrane processed in the step (3) in a second membrane casting solution of 1TMAOH, performing static hydrothermal synthesis at 80 ℃ for 3 hours, and cleaning, soaking and drying the membrane after the synthesis is finished to obtain the inorganic reverse osmosis membrane.
The inorganic reverse osmosis membranes of the above examples and comparative examples were subjected to a pervaporation desalination experiment at 75 ℃ in a raw material solution of 0.1M NaCl, and the desalination rates and water fluxes of the samples are shown in the following table:
| sample (I) | Salt rejection | Flux (Kg/(m) 2 .h)) |
| Example 1 | 99.98％ | 17.2 |
| Comparative example 1 | 72.50％ | 25.0 |
| Comparative example 2 | 90.10％ | 18.2 |
| Comparative example 3 | 99.99％ | 3.8 |
| Comparative example 4 | 92.49％ | 18.2 |
| Comparative example 5 | 89.10％ | 17.9 |
| Comparative example 6 | 91.70％ | 18.8 |
In combination with the above table, it can be seen that when there is only a relatively loose layer, the membrane has a very low salt rejection rate, although it has a high flux; while the flux of the membrane drops greatly when only a relatively dense layer is present, the salt rejection rate is still not high, and changing the operating conditions of the present invention results in a decrease in salt rejection rate of the membrane. While in comparative example 3 using a dense layer having two layers, the flux was significantly lower than that of the present invention although the salt rejection was similar to that of the present invention (slightly higher than that of the present invention), and thus it can be seen that the present invention can significantly increase the flux of the membrane while securing the salt rejection.
There are many other possible embodiments of the present invention, which are not listed here, and the embodiments claimed in the claims of the present invention can be implemented.
The details not described in the specification of the present application belong to the common general knowledge of those skilled in the art.
In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, that a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article of commerce or system in which the element is comprised.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (9)
1. A preparation method of an inorganic reverse osmosis membrane for water treatment is characterized in that the reverse osmosis membrane comprises a support layer, a relatively loose layer and a relatively dense layer which are sequentially connected, wherein the relatively loose layer is prepared by an in-situ hydrothermal method, a zeolite framework part is dealuminated through acid treatment, and the relatively loose layer has intercrystalline micropore defects; the preparation method comprises the following steps:
(2) preparation of a relatively loose layer: preparation of a1SiO molar ratio 2 :b1Al 2 O 3 :c1Na 2 O:d1H 2 Soaking the pretreated carrier in the first membrane casting solution, performing static hydrothermal synthesis for 5-6h at a first synthesis temperature, and cleaning, soaking and drying to obtain a primary membrane; in the first casting solution, a1 is 4-6, b1 is 1-4, c1 is 3-10, d1 is 200-2000, wherein d1/c1>50；
(4) Preparation of the relatively dense layer: preparation of a2SiO 2 :b2Al 2 O 3 :c2Na 2 Soaking the post-treated primary membrane in a second membrane casting solution of d2H2O, e2TMAOH, performing dynamic hydrothermal synthesis at a second synthesis temperature for 3-4H, and cleaning, soaking and drying to obtain the inorganic reverse osmosis membrane; in the second membrane casting solution, a2 is 4-6, b2 is 0.5-2, C2 is 40-80, d2 is 800-5000, and e2 is 0.5-2, wherein d2/C2<40。
2. The method according to claim 1, characterized by further comprising step (1) before step (2): pretreatment of a carrier: and (3) polishing the carrier by using sand paper, soaking and ultrasonically treating the carrier by using deionized water, acid, alkali and deionized water respectively, drying the carrier, and roasting the carrier in a muffle furnace to remove organic matters.
3. The method according to claim 1, characterized in that between steps (2), (4) there is further step (3): post-treatment of the relatively loose layer: and (3) dipping the primary membrane obtained in the step (2) in an acid solution for 3-5s, repeating for 2-3 times, and washing with deionized water.
4. The method as claimed in claim 1, wherein the sand paper used in step (1) is 400-1500 mesh, the acid used is 1-2M hydrochloric acid, and the base used is 1-2M sodium hydroxide.
5. The method of claim 1, wherein the first synthesis temperature is 50-60 ℃ and the second synthesis temperature is 70-90 ℃.
6. The method of claim 1, wherein the support is in the form of a tube, hollow fiber.
7. The method of claim 1, wherein the support material is alumina or a metal material.
8. The method of claim 1, wherein the dynamic synthesis is performed by rotating the whole synthesis kettle at a rotation rate of 5-15 cycles/min.
9. The method according to claim 1, wherein the acidic solution in step (3) is 4-5M hydrochloric acid.
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|---|---|---|---|---|
| CN101112676A (en) * | 2006-07-27 | 2008-01-30 | 中国科学院大连化学物理研究所 | Two-step home-position hydrothermal synthesis of molecular sieve film |
| CN105727757A (en) * | 2016-03-18 | 2016-07-06 | 宁夏大学 | Preparation method of orientation LTL type molecular sieving membrane for gas separation |
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| Publication number | Publication date |
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| CN109092079B (en) | 2020-10-13 |
| CN111871219A (en) | 2020-11-03 |
| CN109092079A (en) | 2018-12-28 |
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