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Preparation method of modified polyether sulfuryl hydrophobic film for gas-liquid film contactor

A hydrophobic membrane and polyethersulfone technology, which is applied in the field of preparation of modified polyethersulfone-based hydrophobic membranes, can solve the problems of gas-liquid membrane contactors with modified polyethersulfone membranes, and achieve good chemical stability , increase surface roughness, improve the effect of high temperature resistance

Inactive Publication Date: 2014-01-08
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there have been no public reports on the modification of polyethersulfone membranes by combining sol-gel and fluorination methods for gas-liquid membrane contactors

Method used

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  • Preparation method of modified polyether sulfuryl hydrophobic film for gas-liquid film contactor
  • Preparation method of modified polyether sulfuryl hydrophobic film for gas-liquid film contactor

Examples

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preparation example Construction

[0034]The solvent required for the preparation of the polyethersulfone-based membrane includes one or two mixed additions of dimethylacetamide, dimethylformamide, N-methylpyrrolidone, dimethyl sulfoxide, and triethyl phosphate solvent. The additives used include at least one of polyethylene glycol, ethylene glycol, glycerol, anhydrous lithium chloride, octanol, cyclohexanol and the like. Wherein, the composition of the casting solution includes 10-30 wt.% of polyethersulfone, 5-16 wt.% of additive, and 54-85 wt.% of solvent.

[0035] The preparation raw material of described sol-gel liquid comprises silicate, ammoniacal liquor, dehydrated alcohol, and wherein silicate comprises tetraethyl orthosilicate (TMOS), tetraethyl orthosilicate (TEOS) and polyalkoxysilane One of them; raw materials for the preparation of fluorinated liquid include low surface energy fluorine-containing siloxane, ammonia water, and absolute ethanol. The fluorine-containing siloxane includes one of dode...

Embodiment 1

[0039] (1) The present invention adds 10wt.% polyethersulfone, 5wt.% additive polyethylene glycol 400 (PEG400) and 85wt.% solvent dimethylacetamide (DMAc) into a three-necked flask, and stirs evenly at 60°C for 3h As above, the casting solution was obtained. The polyethersulfone-based membrane was prepared by immersion precipitation phase inversion method. Soak in pure water for 2-3 days, take out and dry for later use.

[0040] (2) Add 98% absolute ethanol by volume and 1% ammonia by volume into a three-necked flask, stir for 30 minutes below 30°C, and mix evenly; then add 1% orthosilicate methyl ester dropwise , Stir for more than 3h, it is a white uniform sol. Pour it into a beaker and let it stand for 8 hours; soak the dried polyethersulfone base film in the sol-gel solution for 5 minutes, rinse it with absolute ethanol after taking it out, and let it dry naturally. The dried film was placed in an oven for heat treatment at T=50°C for 30min.

[0041] (3) Add 98% absolu...

Embodiment 2

[0044] (1) The present invention adds 16wt.% polyethersulfone, 16wt.% additive polyethylene glycol 400 (PEG400) and 68wt.% solvent dimethylacetamide (DMAc) into a three-necked flask, and stirs evenly at 60°C for 3h As above, the casting solution is obtained. The polyethersulfone-based membrane was prepared by immersion precipitation phase inversion method. Soak in pure water for 2-3 days, take out and dry for later use. In this example, the thickness of the polyethersulfone base film prepared in this example is about 110 μm, and the air permeability of the polyethersulfone base film after drying is measured to be 253.2 m 3 / m 2 h, the surface contact angle is 78° as attached figure 1 As shown in (A), the field emission electron microscope image of the unmodified polyethersulfone membrane surface is shown in the attached figure 2 (A) shown.

[0045] (2) Add 90% absolute ethanol by volume and 5% ammonia by volume into a three-necked flask, stir for 30 minutes below 60°C, a...

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Abstract

The invention relates to a preparation method of a modified polyether sulfuryl hydrophobic film for a gas-liquid film contactor. According to the method provided by the invention, the polyether sulfuryl film is modified in a hydrophobic manner by virtue of combination of sol-gel and a fluorination method, and gases are removed and absorbed under the support of the gas-liquid film contactor. The modifying method provided by the invention comprises the following preparation processes: mixing absolute ethyl alcohol, ammonia water and silicate ester in a certain proportion and stirring to obtain a sol-gel liquid and carry outing surface modification on the polyether sulfuryl film; modifying the modified base film by using fluorine-containing siloxane with low surface energy to obtain the modified polyether sulfuryl hydrophobic film. The film has excellent performances such as high temperature resistance, corrosion resistance and good ventilation effect, and can be used in the gas-liquid film contactor to remove carbon dioxide, sulfur dioxide and smoke with complex components.

Description

technical field [0001] The invention relates to a method for preparing and modifying a membrane for a membrane contactor, in particular to a method for preparing a modified polyethersulfone-based hydrophobic membrane for a gas-liquid membrane Breathable membrane material. At the same time, this high-performance hydrophobic membrane is also a membrane product required for seawater utilization processes such as membrane distillation seawater desalination, gaseous membrane method for bromine extraction, and membrane crystallization for salt production. Background technique [0002] The demand for membrane technology in ensuring industrial energy conservation, emission reduction and clean production is increasingly urgent. In recent years, high-performance separation membranes are urgently needed for waste gas treatment and product purification in industries such as electric power, chemical industry, metallurgy, and petroleum. Removal of carbon dioxide and sulfur dioxide, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/68B01D69/02B01D67/00B01D53/22C08J9/40
CPCY02C10/10Y02A50/20Y02C20/40Y02P20/151Y02P20/50
Inventor 张玉忠李涵叶卉李泓
Owner TIANJIN POLYTECHNIC UNIV
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