CN102302901A - Method for enhancing water flux of polyamide reverse-osmosis composite membrane - Google Patents
Method for enhancing water flux of polyamide reverse-osmosis composite membrane Download PDFInfo
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- CN102302901A CN102302901A CN201110154634A CN201110154634A CN102302901A CN 102302901 A CN102302901 A CN 102302901A CN 201110154634 A CN201110154634 A CN 201110154634A CN 201110154634 A CN201110154634 A CN 201110154634A CN 102302901 A CN102302901 A CN 102302901A
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- osmosis composite
- polyamide reverse
- water flux
- reverse osmosis
- composite film
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Abstract
The invention belongs to a method for enhancing water flux of a polyamide reverse-osmosis composite membrane. The polyamide reverse-osmosis composite membrane which is obtained through interfacial polymerization is subjected to being processed for a certain period of time by a saline solution which contains organic polar solvents, acids, alcohols, phenolic ethers, ketones and the like and is then subjected to heat treating and sufficient washing, so that the water flux of the obtained membrane is greatly enhanced.
Description
Technical field
The present invention relates to a kind of method that improves the polyamide reverse osmosis composite film water flux, belong to preparation method's technical field of pellicle.
Background technology
Nanofiltration and reverse osmosis membrane are because of the separating property to the brilliance of organic molecule and inorganic ion, and safety, environmental friendliness, advantage such as easy to operate and become one of key technology of water treatment.Its application comprises the seawater and the bitter degree of saltinessization, water softening, and middle water reclaims, Industrial Wastewater Treatment, wide spectrums such as ultra-pure water preparation.Wherein composite membrane can be with the rejection of film because of it, water flux, performance optimization such as stability and become current with fastest developing speed, use maximum film kinds, surpassing 90% nanofiltration and reverse osmosis membrane in the market is composite membrane.Composite membrane is meant very thin, the different materials fine and close, that the special separation function is arranged of compound one deck on the support counterdie of porous.Compare with integrated film, the surface compact layer thickness of composite membrane is thinner, thereby makes film have the high solute separation rate and the transmission rates of water simultaneously, and optimizable physical chemistry structure, can satisfy various Selective Separation demand.The current composite membrane that is widely used in the water treatment field is mainly taked the mode of interfacial polymerization, polyamide film is compound to micropore supports the counterdie surface.Common technical process has detailed introduction at the United States Patent (USP) 4277344 of initiative.The micropore counterdie that at first polysulfones is coated on the polyester non-woven fabric and forms; Be immersed in the diamines or the polyamines aqueous solution, drench through wind then, methods such as roll-in are removed the unnecessary amine aqueous solution in film surface; Be immersed in again in organic non-polar solution of polynary acyl chlorides and acyl chlorides generation interface polymerization reaction; Thereby form the fine and close polyamide ultrathin active layer with separation function on the surface, after the film forming, fully washing and suitable heat cure are handled and can be increased film properties.
Summary of the invention
The present invention wants the technical solution problem to be: overcome the shortcoming of above-mentioned prior art, a kind of method that improves the polyamide reverse osmosis composite film water flux is provided.
In order to solve above technical problem; A kind of method that improves the polyamide reverse osmosis composite film water flux of the present invention; It is characterized in that: will handle with the saline solution that contains organic polar solvent through the polyamide reverse osmosis composite film of interfacial polymerization gained; Heat-treat after half-dried or the UV processing, the water flux of gained film is greatly improved again.
Further, in the said saline solution, the concentration of salt is 0.1-50%, and salt is inorganic salts or organic salt.
Further, the time that polyamide reverse osmosis composite film uses saline solution to handle is 10 seconds-1 hour.
Further, the polyamide reverse osmosis composite film mode of using saline solution to handle is that surface-coated is handled or immersion treatment.
Said method is mounted to molecules of salt in the polyamide molecule through the swelling action of polyamide molecule in related solution, with molecules of salt (washing) stripping, the gas porosity of film is increased behind the dry solidification, has correspondingly increased the water flux of film.
The specific embodiment
Embodiment provided by the invention is following:
Comparative Examples: the polysulfones counterdie of the about 200A of average pore size was immersed in 2.0% the m-phenylene diamine (MPD) aqueous solution 2 minutes, was immersed in after half-dried with squeegee roll-in film surface in 0.2% the pyromellitic trimethylsilyl chloride hexane solution 30 seconds.Put into 90 ℃ oven 10 minutes after the taking-up.The composite membrane performance of gained is used following condition test: feeding liquid: the 1500ppm NaCl aqueous solution; Test pressure: 1.5MPa; Probe temperature: 25 ℃.The rejection 99.2% of gained test result: NaCl, water flux are 0.87M
3/ M
2.d.
Embodiment 1: Comparative Examples gained composite membrane is used 5%DMAC, and the aqueous solution of 10%NaCl was at room temperature handled 20 minutes, took out the back with 90 ℃ oven 10 minutes, acetone 2 minutes, and test condition is identical with Comparative Examples, and the gained result is listed in table 1.
Embodiment 2: with Comparative Examples gained composite membrane with 5% phenol, 10% glacial acetic acid, 10% the NaCl aqueous solution 20 minutes takes out the back with 90 ℃ oven 10 minutes, acetone 2 minutes, test condition is identical with Comparative Examples, the gained result is listed in table 1.
Table 1
Can know that from last table after the inventive method washing, gained polyamide reverse osmosis composite film water flux is significantly improved.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (4)
1. method that improves the polyamide reverse osmosis composite film water flux is characterized in that: will handle with the saline solution that contain organic polar solvent through the polyamide reverse osmosis composite film of interfacial polymerization gained, and heat-treat after half-dried or UV handles again.
2. the method for raising polyamide reverse osmosis composite film water flux according to claim 1 is characterized in that: in the said saline solution, the concentration of salt is 0.1-50%, and salt is inorganic salts or organic salt.
3. the method for raising polyamide reverse osmosis composite film water flux according to claim 1 is characterized in that: the time that polyamide reverse osmosis composite film uses saline solution to handle is 10 seconds-1 hour.
4. the method for raising polyamide reverse osmosis composite film water flux according to claim 1 is characterized in that: the mode that polyamide reverse osmosis composite film uses saline solution to handle is handled or immersion treatment as surface-coated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110154634A CN102302901A (en) | 2011-06-10 | 2011-06-10 | Method for enhancing water flux of polyamide reverse-osmosis composite membrane |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110154634A CN102302901A (en) | 2011-06-10 | 2011-06-10 | Method for enhancing water flux of polyamide reverse-osmosis composite membrane |
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| Publication Number | Publication Date |
|---|---|
| CN102302901A true CN102302901A (en) | 2012-01-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110154634A Pending CN102302901A (en) | 2011-06-10 | 2011-06-10 | Method for enhancing water flux of polyamide reverse-osmosis composite membrane |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108939951A (en) * | 2018-07-26 | 2018-12-07 | 浙江工业大学 | A kind of self-assembled modified polyamide reverse osmosis composite film and its application |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4230583A (en) * | 1975-07-30 | 1980-10-28 | Antonio Chiolle | Supported anisotropic reverse osmosis membranes based on synthetic polyamides and processes for their preparation |
| CN1951549A (en) * | 2006-09-08 | 2007-04-25 | 浙江工商大学 | Method for preparing multilayer polyamide composite film |
| CN101112675A (en) * | 2006-07-27 | 2008-01-30 | 中国科学院大连化学物理研究所 | Method for modifying compound film surface |
| CN101439271A (en) * | 2008-12-04 | 2009-05-27 | 宁波灏钻科技有限公司 | Method for preparing hydrophilic anti-pollution reverse osmosis membrane |
| CN101569836A (en) * | 2009-03-27 | 2009-11-04 | 上海应用技术学院 | High-flux composite reverse osmosis membrane and preparation method thereof |
-
2011
- 2011-06-10 CN CN201110154634A patent/CN102302901A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4230583A (en) * | 1975-07-30 | 1980-10-28 | Antonio Chiolle | Supported anisotropic reverse osmosis membranes based on synthetic polyamides and processes for their preparation |
| CN101112675A (en) * | 2006-07-27 | 2008-01-30 | 中国科学院大连化学物理研究所 | Method for modifying compound film surface |
| CN1951549A (en) * | 2006-09-08 | 2007-04-25 | 浙江工商大学 | Method for preparing multilayer polyamide composite film |
| CN101439271A (en) * | 2008-12-04 | 2009-05-27 | 宁波灏钻科技有限公司 | Method for preparing hydrophilic anti-pollution reverse osmosis membrane |
| CN101569836A (en) * | 2009-03-27 | 2009-11-04 | 上海应用技术学院 | High-flux composite reverse osmosis membrane and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108939951A (en) * | 2018-07-26 | 2018-12-07 | 浙江工业大学 | A kind of self-assembled modified polyamide reverse osmosis composite film and its application |
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Application publication date: 20120104 |