Processing method for reducing NaCl removal rate of nano filter membrane
A treatment method, nanofiltration membrane technology, applied in chemical instruments and methods, permeation/dialysis water/sewage treatment, membrane technology, etc., can solve unreasonable and uneconomical problems
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Embodiment 1
[0013] Soak the polyamide nanofiltration membrane in a NaOH solution with a pH of 8 and 25°C for 6 hours at an operating pressure of 150psi, take it out, wash it with deionized water at 20°C, and then use 1000mg / L at an operating pressure of 150psi, Soak in hydrogen peroxide solution at 25°C for 8 hours, take it out, and wash it with deionized water at 20°C. The above-mentioned treated nanofiltration membrane is placed on a membrane performance tester, under the operating pressure of 220psi, at 25°C, the membrane is treated with 1000mg / L, and the pH is 7.5 NaCl solution, and its NaCl rejection rate is 31%; The membrane can handle the mixed brine solution with NaCl concentration of 100g / L, SO42-concentration of 10g / L, pH of 7.1, operating pressure of 360psi, and at 30°C, its NaCl rejection rate is 2.6%, SO42- rejection rate is 97% %.
Embodiment 2、 Embodiment 3
[0015] Repost the pH value of the sodium hydroxide solution in embodiment 1, the time of soaking liquid, the operating pressure when soaking, other
[0016] Same as Example 1, the improved nanofiltration membrane was obtained, and the membrane performance test was performed under different test conditions.
[0017] Soluble NaOH in H 2 o 2 dissolve
[0018] Treatment solution Immersion condition Immersion time NaCl removal SO2 removal 4 2- Detection conditions
[0019] example
[0020] Liquid pH value Liquid concentration
[0021] The NaCl concentration is 1000mg / L, the temperature is 28°C,
[0022] 9 1000 Temperature is 25 5 27
[0023] NaCl solution at pH 10.1 at a pressure of 218 psi
[0024] °C,
[0025] 2 The concentration of NaCl is 200g / L, the pressure is 28°C,
[0026] SO 4 2- The concentration is 20g / L, pH 9 1000 5 1.4 97.8
[...
Embodiment 4
[0038] The NaCl solution with a concentration of 1000mg / L and a pH of 7.5 is treated with a polyamide nanofiltration membrane. Under the operating pressure of 220psi and at 25°C, the NaCl rejection rate is 42.1%; the NaCl concentration of the membrane is 200g / L, SO 4 2- Concentration is 10g / L, using mixed brine solution with pH of 7.1, operating pressure is 360psi, at 29°C, its NaCl rejection rate is 10%, SO 4 2- The rejection rate is 99%.
[0039] Soak the above-mentioned unused NF200-400 nanofiltration membrane with pH 10, 25°C NaOH solution for 5 hours, take it out, wash it with 20°C deionized water, and then use 500mg / L under the operating pressure of 150psi, the temperature is Soak in hydrogen peroxide solution at 25°C for 8 hours, take it out, and wash it with deionized water at 20°C. The above-mentioned treated nanofiltration membrane is placed on the membrane performance tester, under the operating pressure of 220psi, at 25°C, the membrane is treated with 1000mg / L,...
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