CN101234295B - 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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- CN101234295B CN101234295B CN2007100567055A CN200710056705A CN101234295B CN 101234295 B CN101234295 B CN 101234295B CN 2007100567055 A CN2007100567055 A CN 2007100567055A CN 200710056705 A CN200710056705 A CN 200710056705A CN 101234295 B CN101234295 B CN 101234295B
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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 handing over the sodium hydroxide solution among the embodiment 1, other
Identical with embodiment 1, as to be improved NF membrane, the film properties test under different test conditions.
The molten H of real NaOH
2O
2Molten
Treatment fluid 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, and temperature is 28 ℃,
9 1000 temperature are 25 5 27
The NaCl solution pressure of pH value 10.1 is 218psi
℃，
2 NaCl concentration are 200g/L, and pressure is that temperature is 28 ℃,
SO
4 2-Concentration is 20g/L, and pH 9 1,000 5 1.4 97.8
100psi pressure is 290psi
The mixed-salt aqueous solution of value 10.1
NaCl concentration is 500mg/L, and temperature is 28 ℃,
10 1000 temperature are 25 6 30
The NaCl solution pressure of pH value 10.0 is 220psi
℃，
3 NaCl concentration are 150g/L, and pressure is that temperature is 29 ℃,
SO
4 2-Concentration is 30g/L, and pH 10 1,000 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
2During solution impregnation
The treatment fluid immersion condition takes off NaCl and takes off SO
4 2-Testing conditions
H between example concentration
NaCl concentration is 1000mg/L, and temperature is 25 ℃,
500 8 26.3
The NaCl solution pressure of pH value 7.5 is 220psi
Temperature is 25 ℃,
5 NaCl concentration are 200g/L, SO
4 2-
Pressure is 30 ℃ for the 150psi temperature,
Concentration is 10g/L, pH value 7.1 500 8 1.1 98.2
Mixed-salt aqueous solution pressure be 360psi
NaCl concentration is 1000mg/L, and temperature is 28 ℃,
1000 12 22
The NaCl solution pressure of pH value 10.1 is 218psi
Temperature is 25 ℃,
6 NaCl concentration are 200g/L, SO
4 2-
Pressure is 28 ℃ for the 100psi temperature,
Concentration is 20g/L, pH value 10.1 1,000 12 0.53 97.9
Mixed-salt aqueous solution pressure be 290psi
NaCl concentration is 500mg/L, and the pH temperature is 28 ℃,
1000 10 23
The NaCl solution pressure of value 10.0 is 220psi
Temperature is 25 ℃,
7 NaCl concentration are 150g/L, SO
4 2-
Pressure is 29 ℃ for the 150psi temperature,
Concentration is 30g/L, pH value 10.01000 10 0.86 98.2
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 750mg/L, and the pH temperature is 28 ℃,
3000 8 3
The NaCl solution pressure of value 10.0 is 220psi
Temperature is 27 ℃,
8 NaCl concentration are 100g/L, SO
4 2-
Pressure is 31 ℃ for the 210psi temperature,
Concentration is 20g/L, pH value 9.0 3,000 80 82.6
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 2000mg/L, and temperature is 29 ℃,
3000 4 21.4
The NaCl solution pressure of pH value 10.0 is 220psi
Temperature is 27 ℃,
9 NaCl concentration are 100g/L, SO
4 2-
Pressure is 25 ℃ for the 500psi temperature,
Concentration is 50g/L, pH value 7.8 3,000 4 0.49 97.4
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 1000mg/L, and temperature is 29 ℃,
2000 7 20.4
The NaCl solution pressure of pH value 10.0 is 210psi
Temperature is 37 ℃,
10 NaCl concentration are 150g/L, SO
4 2-
Pressure is 30 ℃ for the 180psi temperature,
Concentration is 60g/L, pH value 6.2 2,000 7 0.34 97.2
Pressure is 290psi
Mixed-salt aqueous solution
NaCl concentration is 3000mg/L, and temperature is 29 ℃,
2500 6 19.8
The NaCl solution pressure of pH value 10.0 is 210psi
Temperature is 27 ℃,
11 NaCl concentration are 200g/L, SO
4 2-
Pressure is 29 ℃ for the 190psi temperature,
Concentration is 70g/L, pH value 8.1 2,500 6 0.26 96.5
Pressure is 270psi
Mixed-salt aqueous solution
NaCl concentration is 1000mg/L, and temperature is 28 ℃,
2500 5 20.5
The NaCl solution pressure of pH value 10.0 is 230psi
Temperature is 30 ℃,
12 NaCl concentration are 100g/L, SO
4 2-
Pressure is 26 ℃ for the 160psi temperature,
Concentration is 70g/L, pH value 9.7 2,500 5 0.31 97.4
Pressure is 280psi
Mixed-salt aqueous solution
Claims (3)
1. processing method that reduces NF membrane to the NaCl removal efficiency is characterized in that: with pH be 8～10 sodium hydroxide solution NF membrane soaking at room temperature to the polyamide material, and clean with washed with de-ionized water 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. the described reduction NF membrane of 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 characterized in that to the processing method of NaCl removal efficiency described sodium hydroxide solution pH value is 9～9.5.
Priority Applications (1)
| 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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| Publication Number | Publication Date |
|---|---|
| CN101234295A CN101234295A (en) | 2008-08-06 |
| CN101234295B true CN101234295B (en) | 2010-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2007100567055A Expired - Fee Related CN101234295B (en) | 2007-02-02 | 2007-02-02 | Processing method for reducing NaCl removal rate of nano filter membrane |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AR084006A1 (en) * | 2010-12-01 | 2013-04-17 | Toray Industries | PROCEDURE FOR THE SEPARATION AND RECOVERY OF A PURIFIED ALCALINE METAL SALT |
| CN106830191B (en) * | 2017-01-20 | 2020-08-28 | 苏州新能环境技术股份有限公司 | Isoelectric point identification-based nanofiltration salt separation process confirmation method |
| CN113398781B (en) * | 2021-06-18 | 2022-07-19 | 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 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288776A (en) * | 2000-09-21 | 2001-03-28 | 华东理工大学 | Preparation of sulfonated polyether sulfone filtering film |
| 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 |
| US7001518B1 (en) * | 2000-11-28 | 2006-02-21 | Hydranautics | Low pressure reverse osmosis and nanofiltration membranes and method for the production thereof |
-
2007
- 2007-02-02 CN CN2007100567055A patent/CN101234295B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1288776A (en) * | 2000-09-21 | 2001-03-28 | 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 |
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