Preparation method of hydrophobic porous separation membrane

A technology of porous separation membrane and hydrophobicity, applied in semipermeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of narrow material selection range, difficult control of pore structure, poor hydrophobic stability, etc., and achieve hydrophobic stability Good, high hydrophobic stability, high porosity effect

Active Publication Date: 2013-09-11
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention overcomes the defects of existing hydrophobic porous separation membranes such as complex preparation process, narrow range of material selection, poor hydrophobic stability, and difficult regulation of pore structure, and provides a preparation method for preparing high-performance hydrophobic porous separation membranes. The membrane has an asymmetric porous structure, high porosity, controllable pore size, and good hydrophobic stability. It can be used in fields such as membrane distillation, membrane absorption, membrane extraction, steam permeation, and oily feed liquid clarification.

Method used

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  • Preparation method of hydrophobic porous separation membrane
  • Preparation method of hydrophobic porous separation membrane
  • Preparation method of hydrophobic porous separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Weigh 0.5g of polyethersulfone (PES, E6020P, BASF) and 0.031g of p-methoxyphenol (as a polymerization inhibitor), add 1.0ml of TEMAc-8 monomer and 49ml of DMAC into the mixture, and pass it under magnetic force at 60°C Stirring for 12 hours gave a homogeneous solution. Blow nitrogen into the homogeneous solution for 20 minutes, seal it for storage, and then place it in 60 The irradiation reaction was carried out in the Co source chamber, the irradiation dose was 5.1 kGy, and the dose rate was 1.5 kGy / h. After taking out, methanol was used as a precipitant to fully precipitate and suction filtered, and the filtrate was subjected to Soxhlet extraction for 72 hours with F113 as an extractant to remove homopolymers, and graft polymer 1 was obtained.

[0037] A hydrophobic porous separation membrane was prepared by using a lyotropic phase separation method: the grafted product 1 was dried in a vacuum oven at 60° C. to a constant weight. Weigh 1.5g of grafted product 1, 15....

Embodiment 2

[0039] The irradiation grafting conditions were the same as those in Example 1, wherein the amount of monomer TEMAc-8 and solvent DMAC added were 4.0ml and 46ml, respectively, to obtain graft polymer 2. The membrane-making method and membrane-making conditions in Example 1 were used to obtain a hydrophobic porous separation membrane 2, and the method in Example 1 was used to measure the membrane distillation desalination performance of the hydrophobic porous separation membrane 2.

Embodiment 3

[0041] This embodiment is a blank embodiment. The PES in Example 1 was selected as the film-making material, and the composition of the casting solution was 17g PES, 80g DMAC, and 3g lithium chloride, and the wet film 3 was obtained according to the film-making method and film-making conditions in Example 1. The wet film 3 was naturally dried to obtain a PES film. The membrane distillation desalination performance of the PES membrane was measured by the method in Example 1.

[0042] figure 1 It is the infrared spectrogram of graft polymer 1, 2 and PES in above-mentioned embodiment 1~3. The results show that compared with PES, grafted polymers 1 and 2 are at 1740cm -1 There is an additional characteristic peak of the ester group, which proves that the monomer TEMAc-8 has been successfully grafted onto PES.

[0043] Table 1 is the performance comparison of the graft polymer obtained in Examples 1-3, the hydrophobic porous separation membrane, PES and the PES membrane. The r...

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Abstract

The invention provides a preparation method of a hydrophobic porous separation membrane. The preparation method comprises the following steps of: cosolubilizing a hydrophobic monomer and a conventional macromolecule membrane making material A into a solvent to form a homogenous solution, carrying out gamma ray irradiation treatment on the homogenous solution to initiate a grafting reaction and obtain a hydrophobic graft polymer, blending the hydrophobic graft polymer with a conventional macromolecule membrane making material B to obtain a blend, and preparing the hydrophobic porous membrane by adopting the blend as a membrane forming material. According to the preparation method of the hydrophobic porous separation membrane, the defects that a membrane preparation technology is complex, a material selecting range is narrow, the hydrophobic stability is poor and a pore structure is difficult to regulate and control and the like in an existing preparation method of the hydrophobic porous separation membrane are overcome. The membrane obtained by the preparation method is of an asymmetric porous structure, has the advantages of high porosity, controllable pore diameter, good hydrophobicity and hydrophobic stability and the like and can be applied to the fields of membrane distillation, membrane separation, membrane extraction, vapour permeation, oily feed clarification and the like.

Description

technical field [0001] The invention relates to a preparation method of a separation membrane, in particular to a preparation method of a hydrophobic porous separation membrane which can be used in processes such as membrane distillation, membrane absorption, membrane extraction, steam permeation or oily material liquid clarification. Background technique [0002] As a green and efficient separation technology, membrane separation technology has been widely used in many industrial fields such as chemical industry, medicine, environmental protection, petroleum and food. According to the needs of practical applications, separation membranes are often required to exhibit a certain degree of hydrophobic properties. For example, in the membrane distillation process, the surface of the porous separation membrane needs to have strong hydrophobicity to prevent the liquid from penetrating through the membrane pores, resulting in a decrease in the efficiency of the separation process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/02B01D71/78C08F283/00C08F259/08C08F265/08C08F259/04C08F2/46
Inventor 沈飞万印华刘丽霞闫会陈向荣苏仪
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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