CN101234295A - Processing method for reducing NaCl removal rate of nano filter membrane - Google Patents
Processing method for reducing NaCl removal rate of nano filter membrane Download PDFInfo
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- CN101234295A CN101234295A CNA2007100567055A CN200710056705A CN101234295A CN 101234295 A CN101234295 A CN 101234295A CN A2007100567055 A CNA2007100567055 A CN A2007100567055A CN 200710056705 A CN200710056705 A CN 200710056705A CN 101234295 A CN101234295 A CN 101234295A
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Abstract
The invention relates to a processing method for improving the separating effect of the nanofiltration membrane, in particular to a processing method of decreasing the NaCl removal rate by the nanofiltration membrane. The nanofiltration membrane is immersed at room temperature by sodium hydroxide solution with pH value of 8 to 10 and concentration of 100 to 5,000mg/L, then is cleaned by the deionization water and then is immersed by hydrogen peroxide aqueous solution of 100 to 5,000mg/L with the immersing temperature of 25 DEG C to 40 DEG C, operation pressure of 100psi to 500psi and immersing time of 4 to 12 hours. The invention also includes the steps that the solution provided by the invention immerses the nanofiltration membrane, thus changing the separating effect of the nanofiltration membrane.
Description
Technical field
The present invention relates to improve the processing method of NF membrane separating effect, especially reduce the processing method of NF membrane the NaCl removal efficiency.
Background technology
At present, the raw materials used sodium chloride major part of China's chlor-alkali enterprise is sea salt and bittern.Sea salt and bittern all contain certain sulfate radical, constantly accumulate in production system, and the operation of electrolytic cell is had side effect.The advanced method that removes sulfate ion is to utilize the stalling characteristic of film that sulfate ion is removed from salt solution and keep sodium chloride.
But NF membrane is being handled sodium chloride and sodium sulphate mixed solution, in the time of to the high rejection of sulfate ion, to the rejection of sodium chloride also more than 10%.This situation when handling the sulfuric acid acid group, has also been handled raw material sodium chloride for chlor-alkali industry, is irrational, and is also uneconomic.
Therefore, the present invention has designed a kind of processing method of improving the NF membrane separating effect, at sodium sulfate concentration 10～70g/L, under the situation of sodium chloride concentration 50～300g/L, when making NF membrane remain on more than 90% to the rejection of sulfate ion, reduce the rejection of NF membrane, reach below 5% sodium chloride.
Summary of the invention
The object of the invention is to improve the processing method of NF membrane separating effect.Reduce the processing method of NF membrane to the NaCl removal efficiency
The invention provides the processing method of improving the NF membrane separating effect, step is as follows:
To the NF membrane soaking at room temperature, use the washed with de-ionized water warp with pH is 8～10, concentration is 100～5000mg/L sodium hydroxide solution then; Aqueous hydrogen peroxide solution with 100～5000mg/L soaks again, and soaking temperature is 25 ℃～40 ℃, and operating pressure is 100psi～500psi, and soak time is 4～12 hours.
The pH of sodium hydroxide solution of the present invention is preferably 9～9.5.Concentration of sodium hydroxide solution is 2000～3000mg/L.
Described NF membrane is the NF membrane of polyamide material.
The method that is used to dispose described sodium hydroxide solution and hydrogenperoxide steam generator is the conventional method of chemistry.
The present invention also comprises and will soak the step of NF membrane with above-mentioned solution, thereby changes the separating effect of described NF membrane.
The specific embodiment
Embodiment 1
With polyamide nanofiltration membrane pH is 8,25 ℃ NaOH solution, under the operating pressure of 150psi, soaked 6 hours, take out, with 20 ℃ washed with de-ionized water, under the operating pressure of 150psi, use 1000mg/L again, temperature is that 25 ℃ hydrogenperoxide steam generator soaked 8 hours, take out, with 20 ℃ washed with de-ionized water.The NF membrane of above-mentioned processing is positioned on the film properties tester, and under the operating pressure of 220psi, under 25 ℃, this film is handled 1000mg/L, and pH is 7.5 NaCl solution, and its NaCl rejection is 31%; It is 100g/L that this film is handled NaCl concentration, and SO42-concentration is 10g/L, and pH is 7.1 mixed-salt aqueous solution, and operating pressure is 360psi, and under 30 ℃, its NaCl rejection is 2.6%, and the SO42-rejection is 97%.
Embodiment 2, embodiment 3 are as following table:
Change pH value, the time of soak, the operating pressure when soaking of the sodium hydroxide solution among the embodiment 1, the NF membrane that other are identical with embodiment 1, as to be improved, the film properties test under different test conditions.
Real
The molten H of NaOH
2O
2Molten
Treatment fluid
The immersion condition dip time takes off NaCl and takes off SO
4 2-Testing conditions
Example
Liquid pH value liquid concentration
NaCl concentration is 1000mg/L,
Temperature is 28 ℃,
9 1000 temperature are 25 5 27
The NaCl solution of pH value 10.1
Pressure is 218psi
℃，
2 NaCl concentration are 200g/L,
Pressure is
Temperature is 28 ℃,
SO
4 2-Concentration is 20g/L, and pH 9 1000
5 1.4 97.8
100psi
Pressure is 290psi
The mixed-salt aqueous solution of value 10.1
NaCl concentration is 500mg/L,
Temperature is 28 ℃,
10 1000 temperature are 25 6 30
The NaCl solution of pH value 10.0
Pressure is 220psi
℃，
3 NaCl concentration are 150g/L,
Pressure is
Temperature is 29 ℃,
SO
4 2-Concentration is 30g/L, and pH 10 1000
6 1.8 96.9
150psi
Pressure is 290psi
The mixed-salt aqueous solution of value 10.0
Embodiment 4
With the polyamide nanofiltration membrane concentration of treatment is 1000mg/L, and pH is 7.5 NaCl solution, and under the operating pressure of 220psi, under 25 ℃, its NaCl rejection is 42.1%; It is 200g/L that this film is handled NaCl concentration, SO
4 2-Concentration is 10g/L, is 7.1 mixed-salt aqueous solution with pH, and operating pressure is 360psi, and under 29 ℃, its NaCl rejection is 10%, SO
4 2-Rejection is 99%.
With above-mentioned untapped NF200-400 NF membrane pH is 10,25 ℃ NaOH solution soaked 5 hours, take out, washed with de-ionized water with 20 ℃, under the operating pressure of 150psi, use 500mg/L again, temperature is that 25 ℃ hydrogenperoxide steam generator soaked 8 hours, takes out, with 20 ℃ washed with de-ionized water.The NF membrane of above-mentioned processing is positioned on the film properties tester, and under the operating pressure of 220psi, under 25 ℃, this film is handled 1000mg/L, and pH is 7.5 NaCl solution, and its NaCl rejection is 26.3%; It is 200g/L that this film is handled NaCl concentration, SO
4 2-Concentration is 10g/L, and pH is 7.1 mixed-salt aqueous solution, and operating pressure is 360psi, and under 30 ℃, its NaCl rejection is 1.1%, SO
4 2-Rejection is 98.2%.
Embodiment 5-12, as following table:
The concentration of the hydrogenperoxide steam generator among the change embodiment 4, the time of soak, the operating pressure when soaking, the temperature of soak, the NF membrane that other are identical with embodiment 4, as to be improved, the film properties test under different test conditions
Real
H
2O
2Solution
During dipping
Treatment fluid
Immersion condition
Take off NaCl and take off SO
4 2-Testing conditions
Example
Concentration
Between h
NaCl concentration is 1000mg/L,
Temperature is 25 ℃,
500 8 26.3
The NaCl solution of pH value 7.5
Pressure is 220psi
Temperature is 25 ℃,
5 NaCl concentration are 200g/L, SO
4 2-
Pressure is 150psi
Temperature is 30 ℃,
Concentration is 10g/L, pH value 7.1 500
8 1.1 98.2
Pressure is 360psi
Mixed-salt aqueous solution
NaCl concentration is 1000mg/L,
Temperature is 28 ℃,
1000 12 22
The NaCl solution of pH value 10.1
Pressure is 218psi
Temperature is 25 ℃,
6 NaCl concentration are 200g/L, SO
4 2-
Pressure is 100psi
Temperature is 28 ℃,
Concentration is 20g/L, pH value 10.1 1000
12 0.53 97.9
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 500mg/L, pH
Temperature is 28 ℃,
1000 10 23
The NaCl solution of value 10.0
Pressure is 220psi
Temperature is 25 ℃,
7 NaCl concentration are 150g/L, SO
4 2-
Pressure is 150psi
Temperature is 29 ℃,
Concentration is 30g/L, pH value 10.0 1000
10 0.86 98.2
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 750mg/L, pH
Temperature is 28 ℃,
3000 8 3
The NaCl solution of value 10.0
Pressure is 220psi
Temperature is 27 ℃,
8 NaCl concentration are 100g/L, SO
4 2-
Pressure is 210psi
Temperature is 31 ℃,
Concentration is 20g/L, pH value 9.0 3000
8 0 82.6
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 2000mg/L,
Temperature is 29 ℃,
3000 4 21.4
The NaCl solution of pH value 10.0
Pressure is 220psi
Temperature is 27 ℃,
9 NaCl concentration are 100g/L, SO
4 2-
Pressure is 500psi
Temperature is 25 ℃,
Concentration is 50g/L, pH value 7.8 3000
4 0.49?97.4
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 1000mg/L,
Temperature is 29 ℃,
2000 7 20.4
The NaCl solution of pH value 10.0
Pressure is 210psi
Temperature is 37 ℃,
10 NaCl concentration are 150g/L, SO
4 2-
Pressure is 180psi
Temperature is 30 ℃,
Concentration is 60g/L, pH value 6.2 2000
7 0.34?97.2
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 3000mg/L,
Temperature is 29 ℃,
2500 6 19.8
The NaCl solution of pH value 10.0
Pressure is 210psi
Temperature is 27 ℃,
11 NaCl concentration are 200g/L, SO
4 2-
Pressure is 190psi
Temperature is 29 ℃,
Concentration is 70g/L, pH value 8.1 2500
6 0.26?96.5
Pressure is 270psi
Mixed-salt aqueous solution
NaCl concentration is 1000mg/L,
Temperature is 28 ℃,
2500 5 20.5
The NaCl solution of pH value 10.0
Pressure is 230psi
Temperature is 30 ℃,
12 NaCl concentration are 100g/L, SO
4 2-
Pressure is 160psi
Temperature is 26 ℃,
Concentration is 70g/L, pH value 9.7 2500
5 0.31?97.4
Pressure is 280psi
Mixed-salt aqueous solution
Claims (4)
1. processing method that reduces NF membrane to the NaCl removal efficiency is characterized in that: to the NF membrane soaking at room temperature, use the washed with de-ionized water warp with pH is 8～10, concentration is 100～5000mg/L sodium hydroxide solution then; Aqueous hydrogen peroxide solution with 100～5000mg/L soaks again, and soaking temperature is 25 ℃～40 ℃, and operating pressure is 100psi～500psi, and soak time is 4～12 hours.
2. reduction NF membrane as claimed in claim 1 is characterized in that to the processing method of NaCl removal efficiency described concentration of sodium hydroxide solution is 2000～3000mg/L.
3. reduction NF membrane as claimed in claim 1 is to the processing method of NaCl removal efficiency, and the pH that it is characterized in that described sodium hydroxide solution is 9～9.5.
4. reduction NF membrane as claimed in claim 1 is characterized in that to the processing method of NaCl removal efficiency described NF membrane is the NF membrane of polyamide material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100567055A CN101234295B (en) | 2007-02-02 | 2007-02-02 | Processing method for reducing NaCl removal rate of nano filter membrane |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2007100567055A CN101234295B (en) | 2007-02-02 | 2007-02-02 | Processing method for reducing NaCl removal rate of nano filter membrane |
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| CN101234295A true CN101234295A (en) | 2008-08-06 |
| CN101234295B CN101234295B (en) | 2010-10-27 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103237760A (en) * | 2010-12-01 | 2013-08-07 | 东丽株式会社 | Method for separation and collection of purified alkali metal salt |
| CN106830191A (en) * | 2017-01-20 | 2017-06-13 | 苏州新能环境技术股份有限公司 | A kind of nanofiltration point salt technique confirmation method based on isoelectric point identification |
| CN113398781A (en) * | 2021-06-18 | 2021-09-17 | 中国农业科学院农业质量标准与检测技术研究所 | Microporous filter membrane material and preparation method and application thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120036C (en) * | 2000-09-21 | 2003-09-03 | 华东理工大学 | Preparation of sulfonated polyether sulfone filtering film |
| US7001518B1 (en) * | 2000-11-28 | 2006-02-21 | Hydranautics | Low pressure reverse osmosis and nanofiltration membranes and method for the production thereof |
| CN1415540A (en) * | 2002-11-19 | 2003-05-07 | 华东理工大学 | Method for removing sulfate ion from solution containing sodium chloride with high concentration |
-
2007
- 2007-02-02 CN CN2007100567055A patent/CN101234295B/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103237760A (en) * | 2010-12-01 | 2013-08-07 | 东丽株式会社 | Method for separation and collection of purified alkali metal salt |
| CN103237760B (en) * | 2010-12-01 | 2016-06-22 | 东丽株式会社 | The method separating and reclaiming refining alkali metal salt |
| CN106830191A (en) * | 2017-01-20 | 2017-06-13 | 苏州新能环境技术股份有限公司 | A kind of nanofiltration point salt technique confirmation method based on isoelectric point identification |
| CN113398781A (en) * | 2021-06-18 | 2021-09-17 | 中国农业科学院农业质量标准与检测技术研究所 | Microporous filter membrane material and preparation method and application thereof |
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| CN101234295B (en) | 2010-10-27 |
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