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Composite membrane prepared by low-temperature plasma technology under normal pressure

A low-temperature plasma and plasma technology, applied in the field of composite membranes and composite membranes prepared by plasma technology, can solve the problems of poor environmental friendliness, achieve environmental friendliness, overcome vacuum equipment, ensure structural integrity and separation performance

Active Publication Date: 2011-09-14
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with plasma technology, the UV-induced graft polymerization process requires the introduction of photoinitiators and organic solvents, which is less environmentally friendly

Method used

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  • Composite membrane prepared by low-temperature plasma technology under normal pressure
  • Composite membrane prepared by low-temperature plasma technology under normal pressure
  • Composite membrane prepared by low-temperature plasma technology under normal pressure

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Select pure water flux 130L / m 2h bar, the asymmetric polyacrylonitrile ultrafiltration membrane with a BSA rejection rate of 96.5% is a porous membrane, and the polyethylene glycol methacrylate (PEO526OHMA) with a strong affinity for aromatic hydrocarbons is a large molecular monomer. The specific preparation process of the composite membrane is as follows: 1) The porous membrane is pre-coated with grafted monomer: after the porous membrane is repeatedly rinsed with deionized water, the degassed monomer concentration is placed in the PEO526OHMA monomer aqueous solution of 0.432mol / L 24h at 35°C to complete the pre-coating of the grafted monomer; 2) Plasma irradiates the porous membrane of the pre-coated grafted monomer to initiate a synchronous irradiation grafting reaction: the pre-coated PEO526OHMA monomer Porous Membrane Insertion figure 1 In the reaction chamber 5 of the device shown, the degassed PEO526OHMA monomer aqueous solution is put into the monomer contain...

Embodiment 2

[0044] Select the same asymmetric polyacrylonitrile ultrafiltration membrane as the porous membrane in Example 1, polyethylene glycol methacrylate (PEO526OHMA) is the macromonomer, and the monomer concentration is 0.108mol / L, precoated at 35°C Covering for 24h, helium as the discharge gas, irradiation power of 125W, irradiation time of 90s, and grafting reaction time of 24h after irradiation. The prepared composite membrane is used for the pervaporation separation of a toluene / n-heptane mixture with a toluene mass fraction of 20% at 80°C, and the permeation flux is 5.6kg / m 2 h, the separation factor is 3.

Embodiment 3

[0046] Select the same asymmetric polyacrylonitrile ultrafiltration membrane as the porous membrane in Example 1, polyethylene glycol methacrylate (PEO526OHMA) is the macromonomer, and the monomer concentration is 0.540mol / L, precoated at 35°C Covering for 24h, helium as the discharge gas, irradiation power of 125W, irradiation time of 90s, and grafting reaction time of 24h after irradiation. The prepared composite membrane is used for the separation of toluene / n-heptane mixture with a mass fraction of toluene of 20% at 80°C, and the permeation flux is 2.0kg / m 2 h, the separation coefficient is 6.6.

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Abstract

The invention discloses a composite membrane prepared by a low-temperature plasma technology under low pressure. The composite membrane is prepared by the following steps of: pre-coating grafting monomers on a porous membrane serving as a basement membrane; irradiating the porous membrane pre-coated with the grafting monomers by using plasmas to initiate synchronous irradiation grafting reaction;performing grafting reaction after plasma irradiation; and performing posttreatment to obtain the composite membrane, wherein the porous membrane is insoluble in aromatic hydrocarbon and the graftingmonomers have high affinity to alcohol and the aromatic hydrocarbon. The invention has the advantage that: under normal pressure, the composite membrane prepared by graft-filling polymerization initiated by the low-temperature plasma technology has good selectivity and penetration flux. The composite membrane prepared by the low-temperature plasma technology under normal pressure has the characteristics of environment-friendly preparation process and suitability for industrial production, and has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of membrane separation, and relates to a composite membrane, in particular to a composite membrane prepared by using normal-pressure low-temperature plasma technology. Background technique [0002] Membrane separation is a new type of high-efficiency separation technology that plays a strategic role in most industries in the 21st century and is widely used in energy, environment, electronics, petrochemical, bio-food and other fields. Separation membranes can be roughly divided into two categories: homogeneous membranes and composite membranes. Compared with homogeneous membranes, the effective separation layer and porous support layer of composite membranes can be prepared from different membrane materials, which can be optimized separately to obtain the best separation performance. At the same time, the effective separation layer of the composite membrane can be very thin, so it has a high permeation flux,...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/78B01D67/00
Inventor 李战胜李杨张犇曲连续张春庆
Owner DALIAN UNIV OF TECH
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