CN109499395A - A kind of preparation method of the reverse osmosis seawater film of high throughput - Google Patents
A kind of preparation method of the reverse osmosis seawater film of high throughput Download PDFInfo
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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
- B01D71/06—Organic material
- B01D71/66—Polymers having sulfur in the main chain, with or without nitrogen, oxygen or carbon only
- B01D71/68—Polysulfones; Polyethersulfones
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- 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
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- B01D67/0088—Physical treatment with compounds, e.g. swelling, coating or impregnation
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- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- 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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Abstract
The invention discloses a kind of preparation methods of the reverse osmosis seawater film of high-performance, including first being coated with precoating aqueous solution to the polysulfones counterdie back side, placement is dried in the shade, it is coated on the counterdie front dried in the shade with the aqueous phase solution containing polyamine again, it is dried in the shade for the second time, it is coated on the counterdie front dried in the shade for the second time with the oil-phase solution for the polynary acyl chlorides being dissolved in Isopar G again, the composite membrane obtained by coating is post-processed at a certain temperature, has obtained the reverse osmosis seawater film of high-performance.The method of interfacial polymerization again, precoating enable to aperture bottom to contact with hydrophilic molecule, can increase the hydrophily of counterdie after the present invention is dried in the shade by precoating；Polyamine can reach fenestra bottom when this also helps the coating of polyamine water phase, so that water phase covers more uniform on counterdie, be conducive to more complete when interfacial reaction, raising seawater film properties.
Description
Technical field
The invention belongs to reverse osmosis composite membrane technical fields, more particularly to a kind of system of the new reverse osmosis seawater film of high throughput
Preparation Method.
Technical background
Sea water desalination membrane separation technique is as a new and high technology, it has also become the new century solves water resource, the energy and environment
One of the common technology of equal fields significant problem.Today of strategic emerging industries is persistently accelerated development in China, seawater film produces
The exploitation of product has made great progress.
Reverse osmosis membrane is the core of reverse osmosis technology, and wherein aromatic polyamides type reverse osmosis composite membrane is compared to other hair infiltrations
Film has higher flux and salt rejection rate, better resistance to pressure and soda acid tolerance range, using the widest in reverse osmosis technology
It is general.But it is light in seawater to limit it because of higher energy consumption, weaker resistance to soiling and poor chlorine resistance for polyamide class composite membrane
Change the development of technical field, also becomes the hot spot and urgent problem to be solved of researcher's concern.
Based on the membrane material of this classics, the flux and rejection of reverse osmosis composite membrane are still continuously improved, this is originated to film
The researchs such as material, preparation process and post-processing deepen continuously.Specifically, it designs and prepares high-throughput reverse osmosis composite membrane
Can set about in terms of three: first is the design and screening before film forming to separating layer and supporting layer functional material；Second is
To the in-situ modified of interface polymerization reaction and regulation in film forming procedure: third is twice-modified to film progress with after after film forming
Processing.
Separating layer is the core of reverse osmosis composite membrane material, and design synthesizing new separating layer membrane materials are expected to fundamentally mention
High film properties.The function monomer of separating layer usually selects polyamine as aqueous phase monomers, and polynary acyl chlorides is as oil phase monomer.Mesh
Before, reverse osmosis composite membrane is commercialized usually using m-phenylene diamine (MPD) as aqueous phase monomers, using pyromellitic trimethylsilyl chloride as organic phase monomer, in recent years
Come, many scholars have studied novel monomeric materials, although the design synthesis of new function monomer can fundamentally change membrane material
Chemical composition, so as to improve the separating property of film, but since the synthesis process of partial monosomy is complex and higher cost, because
There is also certain difficulties in large-scale application for this.
Although the main function of reverse osmosis composite membrane supporting layer is to provide good mechanical performance for film, since interface is poly-
It closes reaction film forming procedure to occur in open support layer surface, therefore support layer material also has the structure and separating property of composite membrane
Certain to influence, relatively smooth and hydrophilic support film surface facilitates the formation of separating layer compact texture.Polysulfones has good
Chemical stability, thermal stability and mechanical performance are most common support membrane materials, hydrophilic by adding in polysulfones casting solution
Property additive or in coagulation bath add the adjustable PS membrane of organic solvent structure and property.
Summary of the invention
The object of the present invention is to provide a kind of new reverse osmosis seawater membrane preparation methods of high-performance, are obtained by the preparation method
To reverse osmosis seawater film be not only able to maintain good rejection, but also water flux can be greatly promoted, and reproducibility is preferable, preparation cost is low
It is honest and clean.
To realize goal of the invention, the invention adopts the following technical scheme:
A kind of preparation method of the reverse osmosis seawater film of high-performance, including first with precoating aqueous solution to the polysulfones counterdie back side into
Row coating, placement are dried in the shade, then are coated on the counterdie front dried in the shade with the aqueous phase solution containing polyamine, are carried out second
It dries in the shade, then is applied on the counterdie front dried in the shade for the second time with the oil-phase solution for the polynary acyl chlorides being dissolved in Isopar G
It covers, the composite membrane obtained by coating is post-processed at a certain temperature, and the reverse osmosis seawater film of high-performance has been prepared；
Contain the one or more hydrophilic molecules or amphipathic molecule for being dissolved in water in the precoating aqueous solution.Here Isopar
G is a kind of Isopars, commercially available.
Preferably, it is to carry out interface in 2% aqueous solution of sodium bisulfite that the polysulfones counterdie, which is stored in mass concentration,
Before reaction prepares composite membrane, polysulfones counterdie is soaked in pure water for 24 hours in advance.
Preferably, the precoating aqueous solution contains polyvinyl alcohol, glutaraldehyde, polyethylene glycol 400, N-N, dimethyl
Formamide, ethyl alcohol, glycerine, etamon chloride, one of dodecyl sodium sulfate or a variety of, and in precoating aqueous solution
The mass fraction of hydrophilic molecule is 0.1-10%.
Preferably, the macromolecule contained in the aqueous phase solution containing polyamine has m-phenylene diamine (MPD) (MPD), piperazine
(PIP), one of polyethyleneimine or a variety of；
Preferably, the aqueous phase solution containing polyamine includes triethylamine and triethylamine hydrochloric acid.
As more preferably selecting, the macromolecule of aqueous phase solution is m-phenylene diamine (MPD) (MPD), and the quality of m-phenylene diamine (MPD) (MPD) point
Number is 0.1-4.0%.
Preferably, the macromolecule contained in the oil-phase solution has pyromellitic trimethylsilyl chloride (TMC), Adipoyl Chloride
(APC), one of hexamethylene diisocyanate (HDI) or a variety of, and the solute polymer mass fraction in oily phase is
0.1-4.0%.
As more preferably selecting, the macromolecule in oil-phase solution is pyromellitic trimethylsilyl chloride (TMC), and TMC mass fraction is
0.1-3.5%.
Preferably, the post-processing temperature of the composite membrane is 100 DEG C -150 DEG C.As more preferably selecting, post-processing temperature
It is 115 DEG C -140 DEG C；The post-processing temperature can be controlled by baking oven.
Polysulfones counterdie can be the counterdie that any producer provides in the present invention, the type pair of the performance difference of counterdie, counterdie
Result of the invention, which has no, to be directly affected, therefore can choose business polysulfones counterdie or self-control, this is also of the invention common
It is applicable in, progress commercial applications provide possibility.Another coating liquid raw material in advance is easy to get, and each component is all highly soluble in water, operation
Process is simple, any one production technology for changing production line is completely dispensed in production line production process, therefore is also this hair
Bright generally suitable, progress commercial applications provide possibility.
Beneficial effects of the present invention: the method for interfacial polymerization again after the present invention is dried in the shade by precoating, it is only necessary to configuration letter
It is excellent that the conventional preparation flow that single precoating aqueous solution progress precoating carries out seawater film again can prepare cutoff performance
High-throughput reverse osmosis seawater film, and this patent precoating aqueous solution is simple and easy to control compared with the existing technology, has both maintained good
Rejection, and water flux is greatly improved, reproducibility is preferable, and preparation cost is cheap.
The present invention mainly uses the method for precoating to the back side of supporting layer (polysulfones counterdie), that is, to non-woven fabrics and branch
That layer of support layer contact is coated.Because there are many aperture on supporting layer, precoating enable to aperture bottom with it is hydrophilic
Property molecule contacts, can increase the hydrophily of counterdie；Polyamine can reach fenestra when this also helps the coating of polyamine water phase
Bottom is conducive to more complete when interfacial reaction, raising seawater film property so that water phase covers more uniform on counterdie
Energy.
Specific embodiment
Illustrate below to a specific embodiment of the invention: following embodiment is provided based on new high-performance seawater
The preparation method of film.Following embodiments are merely provided as explanation rather than limiting the invention.
Polysulfones counterdie used in following embodiment is self-control counterdie.The film date of manufacture to experiment the date less than 30 days, the phase
Between be stored in mass concentration be 2% aqueous solution of sodium bisulfite in.Before carrying out interfacial reaction and preparing composite membrane, by polysulfones bottom
Film is soaked in pure water for 24 hours in advance.
Evaluation: chlorination is made to the film properties of the high-flux reverse osmosis membrane based on new acid absorbent system in following embodiment
Sodium salt rejection rate and water flux.Test pressure when performance evaluation is 550psi, and concentrated water flow is 1.0L/min, and environment temperature is
25 DEG C, concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, concentration 32000ppm.
In following embodiment, salt rejection rate is defined as concentrated water and produces the difference of the concentration of water divided by concentrated water concentration；Water flux definition
For water volume of the unit time through unit area composite separating film, unit L/m in above-mentioned test process2·h(LMH)。
Each of the above data point is averaged to obtain by 9 samples.
Embodiment 1
The precoating aqueous solution of 1% polyvinyl alcohol of ethyl alcohol and mass fraction of configuration quality score 5% is uniformly mixed, then
The m-phenylene diamine (MPD) aqueous solution of configuration quality score 3% and the triethylamine and 3% triethylamine hydrochloride buffer system of addition 1%, are mixed
It closes uniformly, is reconfigured pyromellitic trimethylsilyl chloride (TMC) oil-phase solution that mass fraction is 0.2%.It is first pre- on the polysulfones counterdie back side
Precoating aqueous solution is coated, extra solution is outwelled after 60s, dries in the shade, then on the surface of the film by aqueous phase solution coating, is fallen after 60s
Fall extra solution, dry in the shade, then oil-phase solution is coated on the film that dries in the shade, after 30s, outwells extra oil-phase solution, and
5min is heat-treated in 120 DEG C of baking ovens.Thus the new high-performance seawater film of method preparation is 550psi, concentrated water flow in test pressure
For 1.0L/min, environment temperature is 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, and concentration is
Under the experiment condition of 32000ppm, measuring its water flux is 68LMH, salt rejection rate 99.75%.
Here ethyl alcohol can use glutaraldehyde, polyethylene glycol 400, N-N, dimethylformamide, ethyl alcohol, glycerine, tetraethyl
Ammonium chloride, dodecyl sodium sulfate replace, and certain polyvinyl alcohol can also use glutaraldehyde, polyethylene glycol 400, N-N, dimethyl
Formamide, glycerine, etamon chloride, dodecyl sodium sulfate replace；There are also ethyl alcohol and polyvinyl alcohol two jointly may be used
With glutaraldehyde, polyethylene glycol 400, N-N, dimethylformamide, glycerine, etamon chloride or dodecyl sodium sulfate generation
It replaces.
Embodiment 2
The precoating aqueous solution of 2% polyvinyl alcohol of ethyl alcohol and mass fraction of configuration quality score 5% is uniformly mixed, then
Simultaneously 1% triethylamine and 3% triethylamine hydrochloride buffer body is added in the aq. polyethyleneimine of configuration quality score 3%
System is uniformly mixed, and is reconfigured the Adipoyl Chloride (APC) that mass fraction is 0.2%.First precoating precoats on the polysulfones counterdie back side
Cover aqueous solution, extra solution outwelled after 120s, is dried in the shade, then by aqueous phase solution coating outwell on the surface of the film, after 60s it is extra
Solution dries in the shade, then oil-phase solution is coated on the film to dry in the shade, after 30s, outwells extra oil-phase solution, and in 120 DEG C of baking ovens
Middle heat treatment 5min.Thus the new high-performance seawater film of method preparation is 550psi in test pressure, and concentrated water flow is 1.0L/
Min, environment temperature are 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, and concentration is 32000ppm's
Under experiment condition, measuring its water flux is 70LMH, salt rejection rate 99.75%.
Here ethyl alcohol can use glutaraldehyde, polyethylene glycol 400, N-N, dimethylformamide, ethyl alcohol, glycerine, tetraethyl
Ammonium chloride, dodecyl sodium sulfate replace, and certain polyvinyl alcohol can also use glutaraldehyde, polyethylene glycol 400, N-N, dimethyl
Formamide, glycerine, etamon chloride, dodecyl sodium sulfate replace；There are also ethyl alcohol and polyvinyl alcohol two jointly may be used
With glutaraldehyde, polyethylene glycol 400, N-N, dimethylformamide, glycerine, etamon chloride or dodecyl sodium sulfate generation
It replaces.
Embodiment 3
The precoating aqueous solution of 1% etamon chloride of ethyl alcohol and mass fraction of configuration quality score 8%, mixing are equal
It is even, it is reconfigured the triethylamine and 3% triethylamine hydrochloride buffer body of the m-phenylene diamine (MPD) aqueous solution of mass fraction 3% and addition 1%
System is uniformly mixed, and is reconfigured pyromellitic trimethylsilyl chloride (TMC) oil-phase solution that mass fraction is 0.2%.First at the polysulfones counterdie back side
Upper precoating precoating aqueous solution outwells extra solution after 60s, dries in the shade, then on the surface of the film by aqueous phase solution coating, 60s
Extra solution is outwelled afterwards, is dried in the shade, then oil-phase solution is coated on the film to dry in the shade, after 30s, outwells extra oil-phase solution,
And 5min is heat-treated in 120 DEG C of baking ovens.Thus the new high-performance seawater film of method preparation is 550psi, concentrated water in test pressure
Flow is 1.0L/min, and environment temperature is 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, concentration
It is 65LMH, salt rejection rate 99.7% under the experiment condition of 32000ppm, to measure its water flux.
Here pyromellitic trimethylsilyl chloride (TMC) can use Adipoyl Chloride (APC) or hexamethylene diisocyanate (HDI) generation
It replaces.
Embodiment 4
The precoating aqueous solution of 1% polyvinyl alcohol of n,N dimethylformamide and mass fraction of configuration quality score 5%,
It is uniformly mixed, is reconfigured the triethylamine and 3% triethylamine hydrochloride of the m-phenylene diamine (MPD) aqueous solution of mass fraction 3% and addition 1%
Buffer system is uniformly mixed, and is reconfigured pyromellitic trimethylsilyl chloride (TMC) oil-phase solution that mass fraction is 0.2%.First at polysulfones bottom
Precoating precoating aqueous solution in back of the membrane outwells extra solution after 60s, dries in the shade, then aqueous phase solution is coated in film surface
On, extra solution is outwelled after 60s, is dried in the shade, then oil-phase solution is coated on the film to dry in the shade, after 30s, outwells extra oily phase
Solution, and 5min is heat-treated in 120 DEG C of baking ovens.Thus the new high-performance seawater film of method preparation is in test pressure
550psi, concentrated water flow are 1.0L/min, and environment temperature is 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium chloride
Aqueous solution, concentration are under the experiment condition of 32000ppm, and measuring its water flux is 71LMH, salt rejection rate 99.75%.
Here pyromellitic trimethylsilyl chloride (TMC) can use Adipoyl Chloride (APC) or hexamethylene diisocyanate (HDI) generation
It replaces.
Embodiment 5
The precoating aqueous solution of 1% polyvinyl alcohol of ethyl alcohol and mass fraction of configuration quality score 5% is uniformly mixed, then
Simultaneously 1% triethylamine and 3% triethylamine hydrochloride buffer system is added in the m-phenylene diamine (MPD) aqueous solution of configuration quality score 4%,
It is uniformly mixed, is reconfigured pyromellitic trimethylsilyl chloride (TMC) oil-phase solution that mass fraction is 0.2%.First on the polysulfones counterdie back side
Precoating precoating aqueous solution outwells extra solution after 60s, dries in the shade, then on the surface of the film by aqueous phase solution coating, after 60s
Extra solution is outwelled, is dried in the shade, then oil-phase solution is coated on the film to dry in the shade, after 30s, outwells extra oil-phase solution, and
5min is heat-treated in 120 DEG C of baking ovens.Thus the new high-performance seawater film of method preparation is 550psi, concentrated stream in test pressure
Amount is 1.0L/min, and environment temperature is 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, and concentration is
Under the experiment condition of 32000ppm, measuring its water flux is 61LMH, salt rejection rate 99.75%.
Here pyromellitic trimethylsilyl chloride (TMC) can use Adipoyl Chloride (APC) or hexamethylene diisocyanate (HDI) generation
It replaces.
Embodiment 6
The precoating aqueous solution of 1% glycerine of ethyl alcohol and mass fraction of configuration quality score 5% is uniformly mixed, then matches
Set the triethylamine and 3% triethylamine hydrochloride buffer system of the m-phenylene diamine (MPD) aqueous solution of mass fraction 2% and addition 1%, mixing
Uniformly, it is reconfigured pyromellitic trimethylsilyl chloride (TMC) oil-phase solution that mass fraction is 0.2%.First precoated on the polysulfones counterdie back side
Precoating aqueous solution is covered, extra solution is outwelled after 120s, is dried in the shade, then on the surface of the film by aqueous phase solution coating, is outwelled after 60s
Extra solution, dries in the shade, then oil-phase solution is coated on the film to dry in the shade, after 30s, outwells extra oil-phase solution, and 120
5min is heat-treated in DEG C baking oven.Thus the new high-performance seawater film of method preparation is 550psi in test pressure, and concentrated water flow is
1.0L/min, environment temperature are 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, and concentration is
Under the experiment condition of 32000ppm, measuring its water flux is 73LMH, salt rejection rate 99.75%.
Here pyromellitic trimethylsilyl chloride (TMC) can use Adipoyl Chloride (APC) or hexamethylene diisocyanate (HDI) generation
It replaces.
Embodiment 7
The precoating aqueous solution of 5% glycerine of ethyl alcohol and mass fraction of configuration quality score 3% is uniformly mixed, then matches
It sets the m-phenylene diamine (MPD) aqueous solution of mass fraction 0.1% and 1% triethylamine and 3% triethylamine hydrochloride buffer system is added,
It is uniformly mixed, is reconfigured 0.2% pyromellitic trimethylsilyl chloride (TMC) oil-phase solution.First precoating precoats on the polysulfones counterdie back side
Cover aqueous solution, extra solution outwelled after 60s, is dried in the shade, then by aqueous phase solution coating outwell on the surface of the film, after 60s it is extra
Solution dries in the shade, then oil-phase solution is coated on the film to dry in the shade, after 30s, outwells extra oil-phase solution, and in 120 DEG C of baking ovens
Middle heat treatment 5min.Thus the new high-performance seawater film of method preparation is 550psi in test pressure, and concentrated water flow is 1.0L/
Min, environment temperature are 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, and concentration is 32000ppm's
Under experiment condition, measuring its water flux is 77LMH, salt rejection rate 89.75%.
Here pyromellitic trimethylsilyl chloride (TMC) can use Adipoyl Chloride (APC) or hexamethylene diisocyanate (HDI) generation
It replaces.
Embodiment 8
The ethyl alcohol and mass fraction 4%N of configuration quality score 4%, N-dimethylformamide are uniformly mixed, and are reconfigured quality
The triethylamine and 3% triethylamine hydrochloride buffer system of 1% piperazine of score (PIP), 2% polyethyleneimine and addition one 1%, are mixed
It closes uniformly, is reconfigured pyromellitic trimethylsilyl chloride (TMC) oil-phase solution that mass fraction is 0.2%.It is first pre- on the polysulfones counterdie back side
Precoating aqueous solution is coated, extra solution is outwelled after 60s, dries in the shade, then on the surface of the film by aqueous phase solution coating, is fallen after 60s
Fall extra solution, dry in the shade, then oil-phase solution is coated on the film that dries in the shade, after 30s, outwells extra oil-phase solution, and
5min is heat-treated in 120 DEG C of baking ovens.Thus the new high-performance seawater film of method preparation is 550psi, concentrated water flow in test pressure
For 1.0L/min, environment temperature is 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, and concentration is
Under the experiment condition of 32000ppm, measuring its water flux is 77LMH, salt rejection rate 99.72%.
Here 0.2% pyromellitic trimethylsilyl chloride (TMC) oil-phase solution, can use 0.5% hexamethylene diisocyanate
(HDI) it is replaced with the mixed liquor of 2.5% Adipoyl Chloride (APC)；
Embodiment 9
The precoating aqueous solution of 5% polyvinyl alcohol of ethyl alcohol and mass fraction of configuration quality score 5% is uniformly mixed, then
Simultaneously 1% triethylamine and 3% triethylamine hydrochloride buffer system is added in the m-phenylene diamine (MPD) aqueous solution of configuration quality score 3%,
It is uniformly mixed, is reconfigured 0.2% pyromellitic trimethylsilyl chloride (TMC) and the oil-phase solution of 0.3% Adipoyl Chloride (APC).First poly-
Precoating precoating aqueous solution on the sulfone counterdie back side outwells extra solution after 60s, dries in the shade, then aqueous phase solution is coated in film
Extra solution is outwelled on surface, after 60s, is dried in the shade, then oil-phase solution is coated on the film to dry in the shade, and after 30s, it is extra to outwell
Oil-phase solution, and 5min is heat-treated in 120 DEG C of baking ovens.Thus the new high-performance seawater film of method preparation is in test pressure
550psi, concentrated water flow are 1.0L/min, and environment temperature is 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium chloride
Aqueous solution, concentration are under the experiment condition of 32000ppm, and measuring its water flux is 69LMH, salt rejection rate 99.73%.
Here the m-phenylene diamine (MPD) aqueous solution of mass fraction 3% can also use the m-phenylene diamine (MPD) aqueous solution of mass fraction 3%
It is replaced with the mixed solution of 0.5% piperazine (PIP) of mass fraction 3%.
Comparative example
In the post-processing temperature for constantly changing water phase solubility and oily phase solubility and baking oven, but without using precoating mistake
Journey is prepared for different reverse osmosis using most common buffer system triethylamine hydrochloride/triethylamine system using interfacial polymerization
Seawater film.It is tested by experiment, rejection (i.e. salt rejection rate) of the prepared reverse osmosis membrane to 32000ppm sodium-chloride water solution
Up to 99.6%, water flux is up to 55LMH.Test pressure when performance evaluation is 550psi, and concentrated water flow is 1.0L/
Min, environment temperature are 25 DEG C, and concentrated water pH value is 6.5~7.5, and concentrated water is sodium-chloride water solution, concentration 32000ppm.
Claims (9)
1. a kind of preparation method of the reverse osmosis seawater film of high-performance, it is characterised in that including first using precoating aqueous solution to polysulfones bottom
Back of the membrane is coated, and placement is dried in the shade, then is coated on the counterdie front dried in the shade with the aqueous phase solution containing polyamine, into
Row dries in the shade for the second time, then with the oil-phase solution of the polynary acyl chlorides being dissolved in Isopar G on the counterdie front dried in the shade for the second time
It is coated, the composite membrane obtained by coating is post-processed at a certain temperature, has obtained the reverse osmosis seawater of high-performance
Film；Contain the one or more hydrophilic molecules or amphipathic molecule for being dissolved in water in the precoating aqueous solution.
2. a kind of preparation method of the reverse osmosis seawater film of high-performance according to claim 1, it is characterised in that the polysulfones
It is in 2% aqueous solution of sodium bisulfite, before carrying out interfacial reaction and preparing composite membrane, by polysulfones that counterdie, which is stored in mass concentration,
Counterdie is soaked in pure water for 24 hours in advance.
3. a kind of preparation method of the reverse osmosis seawater film of high-performance according to claim 1, it is characterised in that described is pre-
Coating aqueous solution contains polyvinyl alcohol, glutaraldehyde, polyethylene glycol 400, N-N, dimethylformamide, ethyl alcohol, glycerine, tetraethyl
Ammonium chloride, one of dodecyl sodium sulfate or a variety of, and the mass fraction of hydrophilic molecule is in precoating aqueous solution
0.1-10%.
4. a kind of preparation method of the reverse osmosis seawater film of high-performance according to claim 1, it is characterised in that described contains
There is the macromolecule contained in the aqueous phase solution of polyamine to have m-phenylene diamine (MPD) (MPD), piperazine (PIP), one of polyethyleneimine
Or it is a variety of.
5. a kind of preparation method of the reverse osmosis seawater film of high-performance according to claim 1, which is characterized in that described
It include triethylamine and triethylamine hydrochloride in aqueous phase solution containing polyamine.
6. a kind of preparation method of the reverse osmosis seawater film of high-performance according to claim 4, it is characterised in that aqueous phase solution
Macromolecule be m-phenylene diamine (MPD) (MPD), and the mass fraction of m-phenylene diamine (MPD) (MPD) be 0.1-4%.
7. a kind of preparation method of the reverse osmosis seawater film of high-performance according to claim 1, it is characterised in that the oil
The macromolecule contained in phase solution has pyromellitic trimethylsilyl chloride (TMC), Adipoyl Chloride (APC), hexamethylene diisocyanate (HDI)
One of or it is a variety of, and the solute polymer mass fraction in oily phase is 0.1-4.0%.
8. a kind of preparation method of the reverse osmosis seawater film of high-performance according to claim 7, it is characterised in that oil-phase solution
In macromolecule be pyromellitic trimethylsilyl chloride (TMC), and TMC mass fraction be 0.1-3.5%.
9. a kind of preparation method of the reverse osmosis seawater film of high-performance according to claim 1, it is characterised in that described compound
The post-processing temperature of film is 100 DEG C -150 DEG C.As more preferably selecting, post-processing temperature is 115 DEG C -140 DEG C；The post-processing temperature
It can be controlled by baking oven.
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| CN115364668A (en) * | 2022-07-11 | 2022-11-22 | 浙江工业大学 | Preparation method of high-permeability composite reverse osmosis membrane for seawater desalination |
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