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A preparation method of high-performance seawater desalination membrane and prepared seawater desalination membrane

A high-performance, membrane technology, applied in chemical instruments and methods, seawater treatment, water/sewage treatment, etc., can solve the problems of unreachable flux, high desalination rate and high flux at the same time, and reduce adsorption ability, improving anti-pollution performance, and smoothing the surface

Active Publication Date: 2021-05-11
广东奥斯博膜材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current seawater desalination membranes cannot meet high desalination rate and high flux at the same time, especially when the desalination rate is as high as 99.8%, the flux cannot reach 60L / (m 2 ﹒ h)

Method used

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  • A preparation method of high-performance seawater desalination membrane and prepared seawater desalination membrane
  • A preparation method of high-performance seawater desalination membrane and prepared seawater desalination membrane
  • A preparation method of high-performance seawater desalination membrane and prepared seawater desalination membrane

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Effect test

Embodiment 1

[0029] A high-performance seawater desalination membrane, the preparation process of which is as follows:

[0030] S1. Mix 16.8% polysulfone with 83.2% N,N-dimethylformamide, stir and dissolve to form a uniform casting solution with a viscosity of 434mPa.s, let it stand for defoaming for 24 hours, and scrape the casting solution directly on the free surface with a scraper. After spinning, immerse in water to precipitate a 20-30 μm polysulfone layer, wash off the solvent to obtain a support layer membrane;

[0031] S2. Immerse the support layer membrane in step S1 in the aqueous phase solution for 20 seconds, take out and drain the residual solution on the surface, then immerse the entire membrane in the oil phase solution for interfacial polymerization reaction for 60 seconds to form a polyamide layer, and drain the residual surface solution. Then rinse with deionized water for 5 min, and pass through 6% NaHSO 3 The solution was treated for 0.5 min, and then immersed in 4% gl...

Embodiment 2

[0034]A high-performance seawater desalination membrane, the preparation process of which is as follows:

[0035] S1. Mix 16.8% polysulfone with 83.2% N,N-dimethylformamide, stir and dissolve to form a uniform casting solution with a viscosity of 434mPa.s, let it stand for defoaming for 24 hours, and scrape the casting solution directly on the free surface with a scraper. After spinning, immerse in water to precipitate a 20-30 μm polysulfone layer, wash off the solvent to obtain a support layer membrane;

[0036] S2. Immerse the support layer membrane in step S1 in the aqueous phase solution for 20 seconds, take out and drain the residual solution on the surface, then immerse the entire membrane in the oil phase solution for interfacial polymerization reaction for 60 seconds to form a polyamide layer, and drain the residual surface solution. Then rinse with deionized water for 5 min, and pass through 6% NaHSO 3 The solution was treated for 0.5 min, and then immersed in 4% gly...

Embodiment 3

[0039] A high-performance seawater desalination membrane, the preparation process of which is as follows:

[0040] S1. Mix 16.8% polysulfone with 83.2% N,N-dimethylformamide, stir and dissolve to form a uniform casting solution with a viscosity of 434mPa.s, let it stand for defoaming for 20 hours, and scrape the casting solution directly with a scraper on the After spinning, immerse in water to precipitate a 20-30 μm polysulfone layer, wash off the solvent to obtain a support layer membrane;

[0041] S2. Immerse the support layer membrane in step S1 in the aqueous phase solution for 20 seconds, take out and drain the residual solution on the surface, then immerse the entire membrane in the oil phase solution for interfacial polymerization reaction for 60 seconds to form a polyamide layer, and drain the residual surface solution. Then rinse with deionized water for 3 minutes, and pass through 6% NaHSO 3 The solution was treated for 1 min, and then immersed in 4% glycerin solut...

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Abstract

The invention discloses a preparation method of a high-performance seawater desalination membrane and the obtained seawater desalination membrane. The preparation method of the high-performance seawater desalination membrane adopts a traditional production process, and only some The carefully screened additives are added to the water phase and the oil phase respectively, and the amount of addition can be controlled to prepare high-performance seawater desalination membranes with high flux and high desalination rate. The preparation method is simple, low-cost, and the process is mature and stable. Good controllability, the flux of the prepared high-performance seawater desalination membrane is 62L / (m 2 ﹒ h) and above, and at the same time, the desalination rate is as high as 99.83% and above, which can meet high throughput and high desalination rate at the same time, and has low surface roughness and good pollution resistance.

Description

technical field [0001] The invention relates to the technical field of seawater desalination, more specifically, to a method for preparing a high-performance seawater desalination membrane and the prepared seawater desalination membrane. Background technique [0002] Seawater desalination is the use of seawater desalination to produce fresh water, which is an open-source incremental technology to realize the utilization of water resources. Currently used seawater desalination methods include seawater freezing method, electrodialysis method, distillation method, reverse osmosis method, and ammonium carbonate ion exchange method. At present, the application of reverse osmosis membrane method and distillation method is the mainstream in the market. Distillation has high energy consumption and is gradually losing economic benefits. Reverse osmosis, also known as ultrafiltration, separates seawater from freshwater by using a semipermeable membrane that only allows solvents to pa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D69/02B01D67/00B01D61/02C02F1/44C02F103/08
CPCB01D61/025B01D67/0006B01D67/0011B01D69/02B01D71/64C02F1/441C02F2103/08Y02A20/131
Inventor 李莉郑周华施东山林杰生谢建新
Owner 广东奥斯博膜材料技术有限公司
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