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Method for preparing composite film by atmospheric pressure low temperature plasma technology

A low-temperature plasma and composite membrane technology, which is applied in the field of membrane separation, can solve the problems of high manufacturing cost of composite membranes, hindering industrial application, and high price of helium, and achieves the effects of stable membrane structure, excellent separation performance and low cost

Active Publication Date: 2018-07-24
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of the composite membrane does not require vacuum and sealing devices, but the preparation cycle is long, and the helium used is expensive, resulting in high manufacturing costs of the composite membrane, which hinders its industrial application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The asymmetric polyacrylonitrile (PAN) ultrafiltration membrane is a porous medium base membrane, polyethylene glycol methacrylate (PEO500OHMA) is a macromolecular graft monomer, and water is a solvent. The preparation process of the composite membrane is as follows:

[0023] 1) Put the PAN ultrafiltration membrane in 0.4mol / L PEO500OHMA monomer solution, and soak it at a constant temperature at 45°C for 2 hours to perform monomer pre-coating.

[0024] 2) Put the PAN ultrafiltration membrane pre-coated in step 1) into the reaction chamber, pass in the discharge gas argon, turn on the radio frequency power supply, and adjust the irradiation power density to 60W / cm 2 , the generated low-temperature argon plasma initiates the grafting reaction. The plasma irradiation time was 90s, and after the synchronous irradiation grafting reaction was completed, the power was turned off.

[0025] 3) Introduce the degassed PEO500OHMA monomer solution into the reaction chamber to carry...

Embodiment 2

[0028] With methanol as solvent, other conditions are the same as in Example 1. The toluene / n-heptane separation coefficient of the prepared composite membrane is 6.8, and the permeation flux is 0.75kg / m 2 h.

Embodiment 3

[0030] Methyl acrylate was used as the grafting monomer at a concentration of 0.4mol / L. All the other conditions are the same as in Example 2. The prepared composite membrane has a separation coefficient of 1.0, does not have the preferential permeability of aromatics, and has no separation performance of aromatics / alkanes.

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Abstract

The invention discloses a method for preparing a composite membrane by virtue of a normal-pressure low-temperature plasma technique, belonging to the technical field of membrane separation. The method is characterized by comprising the following steps: standing and soaking a base membrane in precoating monomers, wherein a porous medium is taken as the base membrane; and carrying out normal-pressure low-temperature plasma irradiation on the precoated base membrane by virtue of argon gas as discharging gas, so as to induce a grafting reaction; after the irradiation, carrying out grafting reaction, so as to prepare the composite membrane. The method has the beneficial effects that the composite membrane is good in selectivity and permeation flux and low in cost and the method is applicable to large-scale production.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, relates to a method for a composite membrane, in particular to a method for preparing a composite membrane by using an atmospheric pressure plasma technology. Background technique [0002] Vapor permeation or pervaporation is the separation of the components in the mixture under the impetus of the vapor pressure difference, using the different dissolution and diffusion properties of the components in the membrane. Compared with traditional azeotropic distillation and extractive distillation, pervaporation technology has the advantages of low energy consumption, high efficiency, and no secondary pollution, and is regarded as a new technology with the most potential to replace traditional methods. It has obvious technical and economic advantages in the dehydration of organic solvents, the removal of organic matter in wastewater, and the separation of organic / organic mixtures. It is espe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D69/12B01D67/00B01D71/78B01D61/14B01D61/02B01D61/36
CPCB01D61/027B01D61/145B01D61/362B01D67/0006B01D67/0079B01D69/127B01D71/78B01D2323/385
Inventor 李战胜张春庆夏玉萍
Owner DALIAN UNIV OF TECH
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