CN107983168B - Method for treating polymer filtration membrane - Google Patents
Method for treating polymer filtration membrane Download PDFInfo
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- CN107983168B CN107983168B CN201711364316.9A CN201711364316A CN107983168B CN 107983168 B CN107983168 B CN 107983168B CN 201711364316 A CN201711364316 A CN 201711364316A CN 107983168 B CN107983168 B CN 107983168B
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- filtering membrane
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- polymer filtering
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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
- B01D67/0083—Thermal after-treatment
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- Thermal Sciences (AREA)
- Inorganic Chemistry (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the technical field of membrane separation, and particularly relates to a treatment method of a polymer filtering membrane; the method comprises the following steps: (1) placing the polymer filtering membrane in a heat treatment environment to ensure that the whole polymer filtering membrane is uniformly stressed; (2) reducing the temperature of the heat treatment environment to-60 to-40 ℃, preserving the heat for 4 to 16 hours, then increasing the temperature of the heat treatment environment to 80 to 90 ℃, preserving the heat for 4 to 16 hours, finally cooling to room temperature, and taking out the polymer filtering membrane; experiments show that the flux stability of the membrane tube of the polymer filtering membrane is greatly improved and the flux attenuation rate is reduced by 10 percent after the treatment by the method.
Description
Technical Field
The invention belongs to the technical field of membrane separation, and particularly relates to a treatment method of a high-molecular filtering membrane.
Background
The polymer filtering membrane is a filtering element which is commonly used in the water treatment and other industrial purification, concentration and separation processes, has the characteristics of high efficiency and convenience in use, and has wide application in the fields of food, environmental protection, bioengineering, pharmacy and the like. In the long-term use, the problem that the film layer is compacted can appear under the effect of continuous pressure in the polymer filtering membrane, and then the flux attenuation phenomenon appears, influences polymer filtering membrane's performance. In order to alleviate the influence of flux attenuation phenomenon on the service performance of the polymer filtering membrane, in the prior art, two methods of adding equipment and replacing a membrane module are adopted, but both methods undoubtedly increase the production cost.
Disclosure of Invention
The invention aims to provide a treatment method of a polymer filtering membrane, which can improve the flux stability of the polymer filtering membrane.
In order to achieve the purpose, the invention adopts the technical scheme that: a treatment method of a polymer filtering membrane comprises the following steps:
(1) placing the polymer filtering membrane in a heat treatment environment to ensure that the whole polymer filtering membrane is uniformly stressed;
(2) reducing the temperature of the heat treatment environment to-60 to-40 ℃, preserving the heat for 4 to 16 hours, then increasing the temperature of the heat treatment environment to 80 to 90 ℃, preserving the heat for 4 to 16 hours, finally cooling to the room temperature, and taking out the polymer filtering membrane.
In the technical scheme, the polymer filtering membrane keeps uniform stress in a heat treatment environment, so that the membrane tube can be prevented from generating statue deformation, and the abnormity of the membrane element in later period packaging is avoided. The stress distribution of the membrane pore structure can be changed by adopting heat treatment, the strength of the membrane pore structure is improved, and the service life of the membrane pore structure is prolonged. Experiments show that after the polymer filtering membrane is subjected to cold treatment and heat treatment, the flux stability of the polymer filtering membrane tube is greatly improved, and the flux attenuation rate is reduced by 10%.
In order to ensure that each membrane tube is uniformly heated, the temperature reduction speed in the step (2) is 2-3 ℃/min, and the temperature rise speed is 2-3 ℃/min.
Preferably, the method for reducing the temperature of the heat treatment environment in the step (2) is to introduce liquid nitrogen.
Preferably, the method for increasing the temperature of the heat treatment environment in the step (2) is heating by a heating resistor.
Detailed Description
The technical solution disclosed in the present invention is further described below with reference to examples 1 to 3.
Example 1: treatment of polymeric filtration membranes
(1) Placing the polymer filtering membrane in a heat treatment environment to ensure that the whole polymer filtering membrane is uniformly stressed;
(2) introducing liquid nitrogen into the heat treatment environment, reducing the ambient temperature from room temperature to-50 ℃ at a cooling speed of 2.5 ℃/min, and preserving heat for 10 hours; heating the heat treatment environment by a heating couple, raising the environment temperature to 85 ℃ at the temperature rise speed of 2.5 ℃/min, preserving the temperature for 10h, finally cooling to the room temperature, and taking out the polymer filtering membrane.
Example 2: treatment of polymeric filtration membranes
(1) Placing the polymer filtering membrane in a heat treatment environment to ensure that the whole polymer filtering membrane is uniformly stressed;
(2) introducing liquid nitrogen into the heat treatment environment, reducing the ambient temperature from room temperature to-60 ℃ at a cooling speed of 2 ℃/min, and preserving heat for 5 hours; heating the heat treatment environment by a heating couple, raising the environment temperature to 90 ℃ at the temperature rise speed of 2 ℃/min, preserving the heat for 4h, finally cooling to the room temperature, and taking out the polymer filtering membrane.
Example 3: treatment of polymeric filtration membranes
(1) Placing the polymer filtering membrane in a heat treatment environment to ensure that the whole polymer filtering membrane is uniformly stressed;
(2) introducing liquid nitrogen into the heat treatment environment, reducing the ambient temperature from room temperature to-40 ℃ at a cooling speed of 3 ℃/min, and preserving heat for 16 hours; heating the heat treatment environment by a heating couple, raising the environment temperature to 80 ℃ at the heating rate of 3 ℃/min, preserving the heat for 16h, finally cooling to the room temperature, and taking out the polymer filtering membrane.
Taking the polymer filtering membrane subjected to heat treatment in the example 1, and packaging the polymer filtering membrane to be used as a test article; and (3) taking the polymer filtering membrane which is not subjected to heat treatment, packaging the polymer filtering membrane, and taking the packaged polymer filtering membrane as a reference substance to carry out flux detection.
The flux detection method comprises the following steps: and respectively installing the test substance and the reference substance on a set of tube membrane test equipment to test the material flux. The material is tea leaching liquor, the material temperature is 30 ℃, the solid content is 4%, circulating water is introduced during testing, and the material temperature is kept stable at about 30 ℃. During the experiment, all the test parameters of the test substance and the reference substance are consistent, and the experimental results are shown in table 1.
TABLE 1 comparison of Membrane flux trends
| Time of day | Reference substance | Test article |
| Initial | 132LMH/Bar | 132LMH/Bar |
| After 2h | 124LMH/Bar | 126LMH/Bar |
| After 4 hours | 117LMH/Bar | 121LMH/Bar |
| After 6 hours | 110LMH/Bar | 116LMH/Bar |
| After 8 hours | 105LMH/Bar | 112LMH/Bar |
| After 10 hours | 101LMH/Bar | 109LMH/Bar |
| After 12h | 98LMH/Bar | 108LMH/Bar |
| After 14h | 96LMH/Bar | 107LMH/Bar |
| After 16h | 96LMH/Bar | 106LMH/Bar |
| After 18h | 96LMH/Bar | 106LMH/Bar |
| After 20h | 96LMH/Bar | 106LMH/Bar |
From table 1, it can be seen that: the flux attenuation rate and the attenuation amplitude of the test product after heat treatment are smaller than those of the reference product, namely, the flux stability of the polymer filtering membrane provided by the invention is high.
Claims (5)
1. A treatment method of a polymer filtering membrane is characterized by comprising the following steps:
(1) placing the polymer filtering membrane in a heat treatment environment to ensure that the whole polymer filtering membrane is uniformly stressed;
(2) reducing the temperature of the heat treatment environment to-60 to-40 ℃, preserving the heat for 4 to 16 hours, then increasing the temperature of the heat treatment environment to 80 to 90 ℃, preserving the heat for 4 to 16 hours, finally cooling to the room temperature, and taking out the polymer filtering membrane.
2. The method for treating a polymer filtration membrane according to claim 1, wherein the temperature reduction rate in the step (2) is 2 to 3 ℃/min.
3. The method for treating a polymer filtration membrane according to claim 1, wherein the temperature increase rate in the step (2) is 2 to 3 ℃/min.
4. The method for treating a polymer filtration membrane according to claim 1, wherein the temperature of the heat treatment atmosphere in step (2) is lowered by introducing liquid nitrogen.
5. The method for treating a polymer filtration membrane according to claim 1, wherein the step (2) is carried out by heating the heat treatment atmosphere with a heating couple.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711364316.9A CN107983168B (en) | 2017-12-18 | 2017-12-18 | Method for treating polymer filtration membrane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711364316.9A CN107983168B (en) | 2017-12-18 | 2017-12-18 | Method for treating polymer filtration membrane |
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| Publication Number | Publication Date |
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| CN107983168A CN107983168A (en) | 2018-05-04 |
| CN107983168B true CN107983168B (en) | 2020-10-20 |
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Citations (8)
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| CN101223217A (en) * | 2005-05-16 | 2008-07-16 | Sk能源株式会社 | Microporous polyethylene film through liquid-liquid phase separation mechanism and preparing method thereof |
| CN102534464A (en) * | 2011-12-28 | 2012-07-04 | 成都易态科技有限公司 | Method for realizing metal porous material aperture adjustment through nitridation and pore structure of material |
| CN105169966A (en) * | 2015-07-14 | 2015-12-23 | 江苏泰氟隆科技有限公司 | Polytetrafluoroethylene three-dimensional microporous membrane and preparation method thereof |
| WO2016049281A1 (en) * | 2014-09-26 | 2016-03-31 | 3M Innovative Properties Company | Separation modules, systems, and methods |
| CN105479780A (en) * | 2015-11-24 | 2016-04-13 | 上海复合材料科技有限公司 | Preparation method of fiber-resin composite material and purpose of method |
| CN106133042A (en) * | 2014-03-26 | 2016-11-16 | 东曹株式会社 | Ultrahigh molecular weight polyethylene stretching micro-porous film |
| CN107020020A (en) * | 2017-05-22 | 2017-08-08 | 天津工业大学 | A kind of preparation method of new MOFs PVDF composite membranes |
| CN107376670A (en) * | 2017-09-08 | 2017-11-24 | 华南农业大学 | A kind of nano-TiO2Modified PE O/PVDF composite hyperfiltration membranes and preparation method |
-
2017
- 2017-12-18 CN CN201711364316.9A patent/CN107983168B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101223217A (en) * | 2005-05-16 | 2008-07-16 | Sk能源株式会社 | Microporous polyethylene film through liquid-liquid phase separation mechanism and preparing method thereof |
| CN102534464A (en) * | 2011-12-28 | 2012-07-04 | 成都易态科技有限公司 | Method for realizing metal porous material aperture adjustment through nitridation and pore structure of material |
| CN106133042A (en) * | 2014-03-26 | 2016-11-16 | 东曹株式会社 | Ultrahigh molecular weight polyethylene stretching micro-porous film |
| WO2016049281A1 (en) * | 2014-09-26 | 2016-03-31 | 3M Innovative Properties Company | Separation modules, systems, and methods |
| CN105169966A (en) * | 2015-07-14 | 2015-12-23 | 江苏泰氟隆科技有限公司 | Polytetrafluoroethylene three-dimensional microporous membrane and preparation method thereof |
| CN105479780A (en) * | 2015-11-24 | 2016-04-13 | 上海复合材料科技有限公司 | Preparation method of fiber-resin composite material and purpose of method |
| CN107020020A (en) * | 2017-05-22 | 2017-08-08 | 天津工业大学 | A kind of preparation method of new MOFs PVDF composite membranes |
| CN107376670A (en) * | 2017-09-08 | 2017-11-24 | 华南农业大学 | A kind of nano-TiO2Modified PE O/PVDF composite hyperfiltration membranes and preparation method |
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