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Application of cross-linked polyether sulfone porous separating membrane material in solvent-resistant nanofiltration process

A technology of porous separation membrane and polyethersulfone, which is applied in the direction of semipermeable membrane separation, ultrafiltration, membrane technology, etc., can solve the problem of less development, and achieve simple preparation method, easy scale-up, excellent chemical stability and mechanical stability Effect

Inactive Publication Date: 2015-06-10
LIAONING NORMAL UNIVERSITY
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Problems solved by technology

Reverse osmosis membranes and hollow fibers made of PSF can also be used for seawater desalination and gas separation, but in the field of solvent-resistant nanofiltration, there is less development, especially for strong polar solvents

Method used

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  • Application of cross-linked polyether sulfone porous separating membrane material in solvent-resistant nanofiltration process
  • Application of cross-linked polyether sulfone porous separating membrane material in solvent-resistant nanofiltration process
  • Application of cross-linked polyether sulfone porous separating membrane material in solvent-resistant nanofiltration process

Examples

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preparation example Construction

[0020] The preparation method of the cross-linked polyethersulfone porous separation membrane material in the present invention, the steps are as follows:

[0021] 1. Dissolve chloromethylated or bromomethylated polyethersulfone in one or any mixed solvent of DMSO, DMF and DMAC with any amount of THF or n-hexane to form a concentration of 15-35 wt %The solution;

[0022] 1. Use a coating scraper with a thickness of 50-500 um to apply the solution on a glass plate or non-woven fabric;

[0023] 1. Volatilize the coated solution in the air for 0-2 minutes, then immerse in water for 1-60 minutes to form a porous separation membrane;

[0024] 1. Soak the above-mentioned chloromethylation and bromomethylation polyethersulfone porous separation membrane in 0-40wt% imidazole, bipyridyl, diamine, ethylenediamine crosslinking agent or any amount of multiple water or Alcohol solution, at 25-60 o Under the condition of C, soak for 0.5-98 hours to obtain a cross-linked polyether...

Embodiment 1

[0027] 10 g of chloromethylated polyethersulfone having the following structure was dissolved in 40 g of N, N-dimethylformamide to prepare a 20% polymer solution. The solution was cast onto a glass plate and flattened with a casting knife. Then it was quickly immersed in 5L of water and solidified for 5 minutes to form a porous separation membrane to obtain a porous membrane of polyethersulfone. The porous separation membrane of polyethersulfone was cross-linked in 5% imidazole in methanol solution for 12 hours to obtain a solvent-resistant nanofiltration membrane.

[0028] in figure 1 The cross-sectional electron microscope picture of the solvent-resistant nanofiltration membrane prepared in Example 1 is given. The membrane material shows a traditional finger-like pore structure. The membrane material is used to separate dyes with different molecular weights in different solvent systems. The structure of the dye is the same as The molecular weight is shown in Table 1.

[0...

Embodiment 2

[0035] Dissolve 10 g of chloromethylated polyethersulfone in 30 g of N, N-dimethylformamide to make a 25% polymer solution. The solution was cast onto a glass plate and flattened with a casting knife. Then it was quickly immersed in 5L of water and solidified for 5 minutes to form a porous separation membrane to obtain a porous membrane of polyethersulfone. The porous separation membrane of polyethersulfone was cross-linked in 5% imidazole aqueous solution for 12 hours to obtain a solvent-resistant nanofiltration membrane.

[0036] The electron microscope structure of the prepared separation membrane is as follows: figure 2 Similar to Example 1, the membrane material has a regular pore structure. The membrane material is used to separate dyes with different molecular weights in different solvent systems. Among the separation conditions, the pressure of 0.8Mpa is adopted, and the effective separation area of ​​the flat membrane is 12.56 cm2. The separation effect is shown i...

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Abstract

The invention discloses an application of a cross-linked polyether sulfone porous separating membrane material in a solvent-resistant nanofiltration process.

Description

technical field [0001] The invention relates to the application of a cross-linked polyethersulfone porous separation membrane material in a solvent-resistant nanofiltration process. Background technique [0002] The membrane separation process uses a selective permeable membrane as the separation medium. When there is a certain driving force (such as pressure difference, concentration difference, potential difference, etc.) on both sides of the membrane, the components on the raw material side selectively permeate the membrane to achieve separation. , The purpose of purification. Most current membrane separation processes are pressure-driven processes. According to different operating conditions or different membrane pore sizes, the pressure process can be divided into different membrane separation processes such as ultrafiltration, microfiltration, reverse osmosis, and nanofiltration. Nanofiltration generally means that the operating pressure is about 5-30 bar, and the mo...

Claims

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Application Information

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IPC IPC(8): B01D61/18B01D71/68B01D67/00
Inventor 陈冬菊刘雪
Owner LIAONING NORMAL UNIVERSITY
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