Cross-linking type polybenzimidazole porous separation membrane and preparation method and application thereof

A polybenzimidazole, porous separation membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, to achieve good application prospects and markets, excellent solvent resistance, excellent chemical stability and mechanical stability Effect

Inactive Publication Date: 2013-04-24
LIAONING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Reverse osmosis membranes and hollow fibers made of PBI can also be used for seawater desalination and gas separation, but in the field of solvent-resistant nanofiltration, it has not been reported yet.

Method used

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  • Cross-linking type polybenzimidazole porous separation membrane and preparation method and application thereof
  • Cross-linking type polybenzimidazole porous separation membrane and preparation method and application thereof
  • Cross-linking type polybenzimidazole porous separation membrane and preparation method and application thereof

Examples

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preparation example Construction

[0059] The preparation method of the cross-linked polybenzimidazole porous separation membrane of the present invention, the steps are as follows:

[0060] (1) Dissolve polybenzimidazole in one or more mixed solvents of DMSO, DMF and DMAC with THF or n-hexane to form a polymer solution with a concentration of 5-40 wt%; the solvents in the mixed solvent are in any proportion or equal proportions;

[0061] (2) Coat the polymer solution on a glass plate or non-woven fabric, volatilize the coated solution in the air for 0-20 minutes, and then immerse in water for 1-60 minutes to form a polybenzimidazole porous separation membrane with a thickness of 20 -1000um;

[0062] (3) Soak the polybenzimidazole porous separation membrane in a solution containing a cross-linking agent at 25-100 o Under the condition of C, soak for 0.5-200 hours to obtain a cross-linked polybenzimidazole porous separation membrane.

[0063] Wherein the cross-linking agent in the solution containing the cro...

Embodiment 1

[0068] 10 g of polybenzimidazole (weight average molecular weight about 50,000) having the following structure was dissolved in 50 ml of N, N-dimethylacetamide to prepare a 20% polymer solution. The solution was cast onto a glass plate and flattened with a casting knife. Then quickly immersed in 5L of water, solidified for 5 minutes to form a porous separation membrane to obtain a porous membrane of polybenzimidazole. The porous separation membrane of polybenzimidazole was cross-linked in 5% methanol solution of p-dichlorobenzylbenzene for 24 hours to obtain a solvent-resistant nanofiltration membrane.

[0069]

[0070] In this embodiment, n represents the number of structural units of the polymer, and 10≤n≤200.

[0071] 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 dy...

Embodiment 2

[0078] Dissolve 3.4 grams of phosphorus pentoxide in 34 grams of polyphosphoric acid, add it to a 500 ml three-necked flask, heat up and stir to form a clear solution, then add 6 mmol of biphenyltetramine, 6 mmol of 4,4'-dicarboxy Diphenyl ether, stir and heat up to 200 degrees, after 20 hours of reaction, cool down, pour into 5% sodium hydroxide solution. After standing for 24 hours, wash well with water until the solution is neutral. Filter and dry. The prepared polymer was dissolved in DMAC to prepare a 15wt% solution, and the solution was cast onto a glass plate and flattened with a casting knife. Then quickly immersed in 5L of water, solidified for 5 minutes to form a porous separation membrane to obtain a porous membrane of polybenzimidazole. The porous separation membrane of polybenzimidazole was cross-linked in 5% methanol solution of p-dichlorobenzylbenzene for 24 hours to obtain a solvent-resistant nanofiltration membrane with the following chemical structure.

[...

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Abstract

The invention relates to a cross-linking type polybenzimidazole porous separation membrane. The membrane is made of homopolymer of polybenzimidazole or copolymer of polybenzimidazole; the structural general formula of the homopolymer of polybenzimidazole is as follows: FORMULA; the structural general formula of the copolymer of polybenzimidazole is as follows: FORMULA; the preparation method of the cross-linking type polybenzimidazole porous separation membrane comprises the following steps: dissolving polybenzimidazole in a mixed solvent of more or more of DMSO, DMF and DMAC and THF or n-hexane so as to form a polymer solution with the concentration of 5-40wt%, wherein each solvent in the mixed solvent is proportioned at random or proportioned equally; coating the polymer solution on a glass plate or non-woven fabrics, volatilizing the coated solution in the air for 0-20 min, then dipping in water for 1-60 min so as to form a polybenzimidazole porous separation membrane, wherein the thickness of the membrane is 20-1000 microns; dipping the polybenzimidazole porous separation membrane in a solution containing cross-linking agent and dipping for 0.5-200h so as to obtain the cross-linking type polybenzimidazole porous separation membrane at the temperature of 25-100 DEG C. The cross-linking type polybenzimidazole porous separation membrane disclosed by the invention is applied to material nanofiltration separation process under solvent condition, and the molecular cut off of the separation membrane is 200-2000.

Description

technical field [0001] The invention relates to a class of cross-linked polybenzimidazole porous separation membrane, a preparation method and the application of the separation membrane 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 t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/62B01D67/00B01D61/08
Inventor 陈冬菊于山山
Owner LIAONING NORMAL UNIVERSITY
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