CN114797495A - Production and manufacturing method of high-pressure nanofiltration membrane - Google Patents
Production and manufacturing method of high-pressure nanofiltration membrane Download PDFInfo
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- 239000012528 membrane Substances 0.000 title claims abstract description 91
- 238000001728 nano-filtration Methods 0.000 title claims abstract description 48
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 23
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002041 carbon nanotube Substances 0.000 claims abstract description 18
- 229910021393 carbon nanotube Inorganic materials 0.000 claims abstract description 18
- 238000011033 desalting Methods 0.000 claims abstract description 18
- 239000004745 nonwoven fabric Substances 0.000 claims abstract description 16
- 238000001035 drying Methods 0.000 claims abstract description 13
- 229920000768 polyamine Polymers 0.000 claims abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims abstract description 10
- 239000000178 monomer Substances 0.000 claims abstract description 9
- 229920002492 poly(sulfone) Polymers 0.000 claims abstract description 6
- 230000004048 modification Effects 0.000 claims abstract description 5
- 238000012986 modification Methods 0.000 claims abstract description 5
- 210000004379 membrane Anatomy 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 10
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims description 9
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 9
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 239000011248 coating agent Substances 0.000 claims description 9
- 238000000576 coating method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 8
- 239000003960 organic solvent Substances 0.000 claims description 7
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 6
- GLUUGHFHXGJENI-UHFFFAOYSA-N Piperazine Chemical compound C1CNCCN1 GLUUGHFHXGJENI-UHFFFAOYSA-N 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 claims description 6
- 239000003607 modifier Substances 0.000 claims description 6
- GETQZCLCWQTVFV-UHFFFAOYSA-N trimethylamine Chemical compound CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 claims description 6
- 238000001223 reverse osmosis Methods 0.000 claims description 5
- 210000002469 basement membrane Anatomy 0.000 claims description 4
- 239000012071 phase Substances 0.000 claims description 4
- BJEPYKJPYRNKOW-REOHCLBHSA-N (S)-malic acid Chemical compound OC(=O)[C@@H](O)CC(O)=O BJEPYKJPYRNKOW-REOHCLBHSA-N 0.000 claims description 3
- GEYOCULIXLDCMW-UHFFFAOYSA-N 1,2-phenylenediamine Chemical compound NC1=CC=CC=C1N GEYOCULIXLDCMW-UHFFFAOYSA-N 0.000 claims description 3
- WZCQRUWWHSTZEM-UHFFFAOYSA-N 1,3-phenylenediamine Chemical compound NC1=CC=CC(N)=C1 WZCQRUWWHSTZEM-UHFFFAOYSA-N 0.000 claims description 3
- CBCKQZAAMUWICA-UHFFFAOYSA-N 1,4-phenylenediamine Chemical compound NC1=CC=C(N)C=C1 CBCKQZAAMUWICA-UHFFFAOYSA-N 0.000 claims description 3
- PVOAHINGSUIXLS-UHFFFAOYSA-N 1-Methylpiperazine Chemical compound CN1CCNCC1 PVOAHINGSUIXLS-UHFFFAOYSA-N 0.000 claims description 3
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims description 3
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 3
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims description 3
- XTXRWKRVRITETP-UHFFFAOYSA-N Vinyl acetate Chemical compound CC(=O)OC=C XTXRWKRVRITETP-UHFFFAOYSA-N 0.000 claims description 3
- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 claims description 3
- FYXKZNLBZKRYSS-UHFFFAOYSA-N benzene-1,2-dicarbonyl chloride Chemical compound ClC(=O)C1=CC=CC=C1C(Cl)=O FYXKZNLBZKRYSS-UHFFFAOYSA-N 0.000 claims description 3
- UWCPYKQBIPYOLX-UHFFFAOYSA-N benzene-1,3,5-tricarbonyl chloride Chemical compound ClC(=O)C1=CC(C(Cl)=O)=CC(C(Cl)=O)=C1 UWCPYKQBIPYOLX-UHFFFAOYSA-N 0.000 claims description 3
- FDQSRULYDNDXQB-UHFFFAOYSA-N benzene-1,3-dicarbonyl chloride Chemical compound ClC(=O)C1=CC=CC(C(Cl)=O)=C1 FDQSRULYDNDXQB-UHFFFAOYSA-N 0.000 claims description 3
- 235000015165 citric acid Nutrition 0.000 claims description 3
- 238000003618 dip coating Methods 0.000 claims description 3
- 229940018564 m-phenylenediamine Drugs 0.000 claims description 3
- 239000001630 malic acid Substances 0.000 claims description 3
- 235000011090 malic acid Nutrition 0.000 claims description 3
- 239000012074 organic phase Substances 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 3
- 230000035484 reaction time Effects 0.000 claims description 3
- 238000007761 roller coating Methods 0.000 claims description 3
- 239000011975 tartaric acid Substances 0.000 claims description 3
- 235000002906 tartaric acid Nutrition 0.000 claims description 3
- 150000007513 acids Chemical class 0.000 claims description 2
- 150000001263 acyl chlorides Chemical class 0.000 claims description 2
- 239000008346 aqueous phase Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 239000013557 residual solvent Substances 0.000 claims description 2
- 238000010612 desalination reaction Methods 0.000 abstract description 10
- 230000006835 compression Effects 0.000 abstract description 5
- 238000007906 compression Methods 0.000 abstract description 5
- 239000000463 material Substances 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 13
- 230000004907 flux Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 238000001723 curing Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000007759 kiss coating Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000000108 ultra-filtration Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
-
- 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
- B01D61/027—Nanofiltration
-
- 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
- B01D71/021—Carbon
-
- 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
- C02F1/442—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by nanofiltration
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Nanotechnology (AREA)
- Water Supply & Treatment (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention provides a production method of a high-pressure nanofiltration membrane, and relates to the field of nanofiltration membranes. The high-pressure nanofiltration membrane comprises a non-woven fabric, a porous supporting layer and a desalination layer, wherein the porous supporting layer is adhered and solidified on the non-woven fabric, the desalination layer is adhered on the surface of the porous supporting layer, polysulfone and carbon nano tubes are used for forming the porous supporting layer on the non-woven fabric, then polyamine monomers and polyacyl chloride are polymerized on the surface of the porous supporting layer to form the desalination layer, and finally the nanofiltration membrane is obtained through rinsing, modification and drying of an organic solution. According to the invention, the polysulfone with high strength is used as the bottom membrane material, the carbon nano tubes with high strength are added into the bottom membrane and the desalting layer, and can be uniformly distributed in the bottom membrane and the desalting layer and firmly combined with the bottom membrane and the desalting layer to form a compact compression-resistant structure, so that the high-pressure resistance of the nanofiltration membrane is improved, and the compression resistance of the nanofiltration membrane in application is improved.
Description
Technical Field
The invention relates to the technical field of nanofiltration membranes, in particular to a production and manufacturing method of a high-pressure nanofiltration membrane.
Background
The nanofiltration membrane is a novel membrane separation technology between ultrafiltration and reverse osmosis, and along with the improvement of environmental protection requirements due to environmental deterioration, the application range of the nanofiltration membrane is wider and wider, and higher operation pressure is required for the treatment of chemical wastewater, biological medicine wastewater, and other concentrated salt wastewater.
The operating pressure range of the existing nanofiltration membrane is 0.2-1.0 MPa, and the nanofiltration membrane has better performance under lower pressure. However, under the condition of high pressure (600-1200 psi), the membrane of the conventional nanofiltration membrane is seriously compacted in the using process, irreversible damage is caused to the membrane, and for the membrane element, the water permeability and the desalination capacity are changed along with the thinning of the membrane compacted by the membrane, the width of a concentrated water flow channel is also greatly changed, so that the stability of the membrane element is influenced, and the applicable scene of the nanofiltration membrane is also limited.
With the popularization of the industrial wastewater recycling and zero discharge technology, the problem of recycling the concentrated solid salt of the high-salinity wastewater at the tail end is increasingly prominent, and the high-pressure nanofiltration membrane is extremely advantageous here, but the research on the high-pressure nanofiltration membrane is less at present, so that the development and research on the nanofiltration membrane with excellent high-pressure resistance are urgently needed.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a production method of a high-pressure nanofiltration membrane, which solves the problems that the pressure resistance of the existing nanofiltration membrane is poor, the membrane is easy to be compacted due to high pressure in the using process, and the performance of the membrane element is unstable.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: the high-pressure nanofiltration membrane comprises a non-woven fabric, a porous supporting layer and a desalting layer, wherein the porous supporting layer is adhered and solidified on the non-woven fabric, the desalting layer is adhered to the surface of the porous supporting layer, the desalting layer is made of polyamine monomers and polyacyl chloride through polymerization, and carbon nanotubes are doped into the porous supporting layer to form spongy micropores.
A nanofiltration membrane in an industrial-grade reverse osmosis membrane element is replaced by the nanofiltration membrane, and the aim of high pressure resistance of the membrane element is fulfilled by optimizing the structure of the membrane.
A production method of a high-pressure nanofiltration membrane comprises the following steps:
the method comprises the following steps: dissolving polysulfone into an organic solvent, adding carbon nanotubes with the diameter of less than 100nm, performing homogeneous deaeration, coating on a non-woven fabric, performing gel conversion, curing, forming a porous supporting layer with the thickness of 45-55 mu m on the non-woven fabric, and rinsing for multiple times to obtain a basement membrane;
step two: dip-coating polyamine monomer and carbon nanotube aqueous phase solution with the particle size of less than 100nm on a bottom film, then kiss-coating organic phase solution of polyacyl chloride, forming a desalting layer on the surface of the bottom film after full reaction, and then drying the bottom film at the temperature of 40-70 ℃ until no residual solvent exists on the surface;
step three: rinsing the dried membrane sequentially through a rinsing tank containing a plurality of hydroxyl polybasic weak acids, and then drying at 70-90 ℃;
step four: and (3) coating the membrane obtained in the third step with a modifier in a roller coating mode, and drying at 90-110 ℃ after modification to obtain the nanofiltration membrane.
Preferably, the amount of the carbon nanotubes in the first step is 0.15 wt% to 0.5 wt%, and the organic solvent in the first step is one or more of dimethyl sulfoxide, N-dimethylacetamide and N, N-dimethylformamide.
Preferably, in the second step, the polyamine is one or more of p-phenylenediamine, o-phenylenediamine, m-phenylenediamine, piperazine, N-methylpiperazine and trimethylamine, the amount of the polyamine is 2 wt% -4 wt%, the water phase temperature is 25-35 ℃, the amount of the carbon nano tube is 0.01 wt% -0.03 wt%, and the polyacyl chloride in the second step is one or more of isophthaloyl chloride, trimesoyl chloride and phthaloyl chloride.
Preferably, the reaction time in the second step is 1-10 min, the reaction temperature is 30-50 ℃, and the humidity is 30-60%.
Preferably, the hydroxy polybasic weak acid in the third step is one or more of malic acid, citric acid and tartaric acid, and the dosage is 2 wt% -8 wt%.
Preferably, the modifier in the fourth step is one or more of glycerol, vinyl acetate and polyvinyl alcohol, and the using amount is 20-30 wt%.
(III) advantageous effects
The invention provides a production method of a high-pressure nanofiltration membrane. The method has the following beneficial effects:
according to the invention, polysulfone with high strength is used as a bottom membrane material, and high-strength carbon nanotubes are added in the bottom membrane and the desalting layer and can be uniformly distributed in the bottom membrane and the desalting layer and firmly combined with the bottom membrane and the desalting layer to form a compact compression-resistant structure, so that the high-pressure resistance of the nanofiltration membrane is improved, and the compression resistance of the nanofiltration membrane in application is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
the embodiment of the invention provides a high-pressure nanofiltration membrane, which comprises a non-woven fabric, a porous supporting layer and a desalting layer, wherein the porous supporting layer is adhered and solidified on the non-woven fabric, the desalting layer is adhered to the surface of the porous supporting layer, the desalting layer is made of polyamine monomers and polyacyl chloride through polymerization, and carbon nanotubes are doped into the porous supporting layer to form spongy micropores so as to increase the pressure tightness of the membrane.
A nanofiltration membrane in an industrial-grade reverse osmosis membrane element is replaced by the nanofiltration membrane, and the aim of high pressure resistance of the membrane element is fulfilled by optimizing a membrane structure.
Example two:
the embodiment of the invention provides a production and manufacturing method of a high-pressure nanofiltration membrane, which comprises the following steps:
the method comprises the following steps: dissolving polysulfone into an organic solvent, adding carbon nanotubes with the thickness of less than 100nm, performing homogeneous defoaming, and coating the solution on a non-woven fabric, specifically, fully stirring the solution, performing defoaming treatment in vacuum, uniformly coating the solution on the non-woven fabric through a slit, performing gel conversion, drying and curing, before drying and curing, transferring the solution to a gel tank for phase conversion treatment, controlling the temperature to be 25-30 ℃, forming a porous supporting layer with the thickness of 45-55 mu m on the non-woven fabric, and rinsing the porous supporting layer for multiple times to obtain a basement membrane, namely, rinsing the basement membrane to remove the organic solvent;
step two: dip-coating polyamine monomer and carbon nanotube aqueous solution below 100nm on a bottom film, then kiss-coating organic phase solution of polyacyl chloride, forming a desalting layer on the surface of the polyacyl chloride after the polyamine monomer and the polyacyl chloride fully react, and then drying at 40-70 ℃ for later use, namely evaporating to remove residual organic solution as far as possible;
step three: immersing the membrane after reaction in a plurality of hydroxyl polybasic weak acid rinsing tanks in sequence, ensuring that a compression-resistant compact layer of the membrane is not puffed under the condition of ensuring the water flux and the desalination rate of the nanofiltration membrane because oxidation treatment cannot be carried out in the process, removing residual polyamine monomers on the membrane, drying at 70-90 ℃, and carrying out heat treatment in a drying mode to improve the crosslinking degree of a desalination layer;
step four: and (3) coating the membrane obtained in the third step with a modifier in a roller coating mode, and drying at 90-110 ℃ after modification to obtain the nanofiltration membrane.
The dosage of the carbon nano tube in the first step is 0.15 wt% -0.5 wt%, and the organic solvent in the first step is one or more of dimethyl sulfoxide, N-dimethylacetamide and N, N-dimethylformamide.
In the second step, the polyamine is one or a mixture of more of p-phenylenediamine, o-phenylenediamine, m-phenylenediamine, piperazine, N-methylpiperazine and trimethylamine, the using amount is 2 to 4 weight percent, the water phase temperature is 25 to 35 ℃, the using amount of the carbon nano tube is 0.01 to 0.03 weight percent, and the poly acyl chloride in the second step is one or more of isophthaloyl chloride, trimesoyl chloride and phthaloyl chloride.
In the second step, the reaction time is 1-10 min, the reaction temperature is 30-50 ℃, and the humidity is 30-60%.
In the third step, the hydroxyl polybasic weak acid is one or more of malic acid, citric acid and tartaric acid, and the dosage is 2 wt% -8 wt%.
In the fourth step, the modifier is one or more of glycerol, vinyl acetate and polyvinyl alcohol, and the using amount is 20-30 wt%.
Example three:
experiment one: extracting the nanofiltration membrane produced in the second embodiment, performing desalination rate, flux and pressure resistance tests on membrane detection equipment under the conditions that an analytically pure NaCl solution with the operating pressure of 800-1200 psi and the concentration of 32000ppm, the solution temperature of 25 ℃ and the pH value of 7.8-8.0 are measured, measuring the water flux and the desalination rate of the membrane after the membrane runs for 2 hours, and obtaining the pressure resistance of the membrane by measuring the thickness change of the membrane before and after the tests, wherein the results are shown in Table 1:
watch (A)
Experiment two: firstly, respectively rolling an 8-inch roll-type membrane element, soaking in pure water for more than or equal to 1 hour, testing conditions are that an analytically pure NaCl solution with the concentration of 32000ppm, the solution temperature is 25 ℃, the pH value is 7.8-8.0, the operating pressure is firstly 800psi for 1 hour, then 1200psi for 1 hour, then adjusting the pressure to 800 for 1 hour, and obtaining the pressure resistance by measuring the change of desalination rate and flux under the same operating pressure before and after pressure rise, wherein the results are shown in Table 2:
TABLE 2
In conclusion, the nanofiltration membrane prepared by the method has stable performance under high pressure, the thickness change of the membrane after testing is extremely small, the pressure resistance and the tightness are excellent, and the high pressure resistance of the nanofiltration membrane is greatly improved, so that the flux and the desalination of the prepared membrane element are basically kept unchanged before and after the high pressure (1200 psi) test, and the performance of the prepared membrane element is stable.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The high-pressure nanofiltration membrane is characterized by comprising a non-woven fabric, a porous supporting layer and a desalting layer, wherein the porous supporting layer is attached and solidified on the non-woven fabric, the desalting layer is attached to the surface of the porous supporting layer, the desalting layer is made of polyamine monomers and polyacyl chloride through polymerization, and carbon nanotubes are doped into the porous supporting layer to form spongy micropores.
2. A reverse osmosis membrane element wherein a nanofiltration membrane sheet in an industrial-grade reverse osmosis membrane element is replaced with the nanofiltration membrane of claim 1.
3. The production method of the high-pressure nanofiltration membrane is characterized by comprising the following steps of:
the method comprises the following steps: dissolving polysulfone into an organic solvent, adding carbon nanotubes with the diameter of less than 100nm, performing homogeneous deaeration, coating on a non-woven fabric, performing gel conversion, curing, forming a porous supporting layer with the thickness of 45-55 mu m on the non-woven fabric, and rinsing for multiple times to obtain a basement membrane;
step two: fully coating polyamine monomers and carbon nanotube aqueous phase solution with the particle size of less than 100nm on a bottom film in a dip-coating mode, then coating organic phase solution of polyacyl chloride, forming a desalting layer on the surface of the bottom film after full reaction, and then drying the bottom film at the temperature of 40-70 ℃ until no residual solvent exists on the surface;
step three: rinsing the dried membrane sequentially through a rinsing tank containing a plurality of hydroxyl polybasic weak acids, and then drying at 70-90 ℃;
step four: and (3) coating the membrane obtained in the third step with a modifier in a roller coating mode, and drying at 90-110 ℃ after modification to obtain the nanofiltration membrane.
4. The production method of the high-pressure nanofiltration membrane according to claim 3, wherein the production method comprises the following steps: the amount of the carbon nano tube in the first step is 0.15-0.5 wt%, and the organic solvent in the first step is one or more of dimethyl sulfoxide, N-dimethylacetamide and N, N-dimethylformamide.
5. The production method of the high-pressure nanofiltration membrane according to claim 3, wherein the production method comprises the following steps: in the second step, the polyamine is one or a mixture of more of p-phenylenediamine, o-phenylenediamine, m-phenylenediamine, piperazine, N-methylpiperazine and trimethylamine, the using amount is 2 wt% -4 wt%, the water phase temperature is 25-35 ℃, the using amount of the carbon nano tube is 0.01 wt% -0.03 wt%, and the poly acyl chloride in the second step is one or more of isophthaloyl chloride, trimesoyl chloride and phthaloyl chloride.
6. The production method of the high-pressure nanofiltration membrane according to claim 3, wherein the production method comprises the following steps: in the second step, the reaction time is 1-10 min, the reaction temperature is 30-50 ℃, and the humidity is 30-60%.
7. The production method of the high-pressure nanofiltration membrane according to claim 3, wherein the production method comprises the following steps: in the third step, the hydroxyl polybasic weak acid is one or more of malic acid, citric acid and tartaric acid, and the dosage is 2-8 wt%.
8. The production method of the high-pressure nanofiltration membrane according to claim 3, wherein the production method comprises the following steps: the modifier in the fourth step is one or more of glycerol, vinyl acetate and polyvinyl alcohol, and the using amount is 20-30 wt%.
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101890315A (en) * | 2010-08-06 | 2010-11-24 | 复旦大学 | Carbon nano tube-polymer composite nanofiltration membrane and preparation method thereof |
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