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Preparation method of gas-phase crosslinking modified polyetherimide nanofiltration membrane

A polyetherimide nano and polyetherimide technology, which is applied in the field of nanofiltration membrane preparation, can solve the problems of environmental pollution membrane solvent resistance, inability to be widely used, and high membrane production cost, and achieve low cost and stability. The effect of enhancing sexuality and reducing energy consumption

Inactive Publication Date: 2013-11-27
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of complex process, high cost of film making, large energy consumption, waste of solvent, environmental pollution and the preparation of existing methods in improving the solvent resistance and stability of the film in the non-aqueous solution system. The film has poor solvent resistance and cannot be widely used, and provides a method for preparing a gas-phase cross-linked modified polyetherimide nanofiltration membrane

Method used

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  • Preparation method of gas-phase crosslinking modified polyetherimide nanofiltration membrane

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specific Embodiment approach 1

[0015] Specific embodiment one: the preparation method of a kind of gas phase cross-linking modified polyetherimide nanofiltration membrane of the present embodiment, carry out according to the following steps:

[0016] Step 1, preparing the casting solution, standing the prepared casting solution at room temperature for 24-36h; wherein, the casting solution is composed of polyetherimide and solvent, and the mass percentage of polyetherimide in the casting solution is The content is 15%-28%, the mass percentage of the solvent is 85%-72%, and the solvent is NMP, DMF or THF.

[0017] Step 2. Preparation of polyetherimide nanofiltration membrane by immersion-precipitation method: pour the above-mentioned prepared casting solution on a glass plate, scrape and coat the casting solution on the glass plate with a film scraper, and then place the film at room temperature Immerse the glass plate in deionized water. After the casting solution is solidified, a layer of film is obtained o...

specific Embodiment approach 2

[0020] Embodiment 2: This embodiment differs from Embodiment 1 in that: the standing time described in Step 1 is 24 hours. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0021] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the mass percentage of polyetherimide in the polyetherimide casting solution described in step one is 20%, 23% or 25%. Others are the same as in the first or second embodiment.

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Abstract

The invention relates to a preparation method of a nanofiltration membrane, particularly a preparation method of a gas-phase crosslinking modified polyetherimide nanofiltration membrane. The invention aims to solve the problems of complex technique, high membrane preparation cost, high energy consumption, waste of solvent, environment pollution, poor solvent resistance of the prepared membrane, and incapability of wide application when the existing method is used for enhancing the solvent resistance and stability of the membrane in a non-aqueous solution system. The preparation method comprises the following steps: 1. preparing a polyetherimide film casting solution; 2. preparing a polyetherimide nanofiltration membrane by an immersion-precipitation process; 3. preparing a gas-phase crosslinking device; and 4. crosslinking the membrane in the crosslinking device to obtain the polyetherimide nanofiltration membrane. The method provided by the invention is simple to operate and low in cost, lowers the energy consumption and waste of solvent, and reduces the environmental pollution; and the obtained gas-phase crosslinking modified polyetherimide nanofiltration membrane has high solvent resistance and higher stability, and prevents over-expansion. The invention is used in the field of separation and purification of active components in the mixture in an organic solution.

Description

technical field [0001] The invention relates to a preparation method of a nanofiltration membrane. Background technique [0002] Nanofiltration membranes are widely used in various industrial fields and scientific research. Nanofiltration membranes have many advantages, such as no phase transition in the separation process, no need for additives, and little influence of temperature, making them of great potential application value in non-aqueous systems in the fields of petrochemical, pharmaceutical, and food. However, at present, traditional nanofiltration membranes are mainly suitable for aqueous solution systems, and it is difficult to expand their use in non-aqueous solutions, and the actual industrial process involves organic solvent systems. application is particularly important. [0003] The existing chemical solvent-resistant nanofiltration membranes have good solvent resistance in a small number of mild organic solvents, but for most organic solvents, such as chlo...

Claims

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Application Information

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IPC IPC(8): B01D71/64B01D67/00B01D69/02
Inventor 邵路张永玲程喜全姜再兴
Owner HARBIN INST OF TECH
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