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Inner surface hydrophilic modified hollow fiber membrane and its preparation method and application

A hydrophilic modification, fiber membrane technology, applied in the field of membrane science, can solve problems such as cumbersome steps, and achieve the effects of simple operation, self-cleaning, and pollution reduction.

Active Publication Date: 2020-09-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can treat high-concentration emulsion wastewater very well and obtain a relatively clean water phase, but there are still disadvantages such as cumbersome steps and the need for secondary treatment for the separation of the oil phase.

Method used

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  • Inner surface hydrophilic modified hollow fiber membrane and its preparation method and application
  • Inner surface hydrophilic modified hollow fiber membrane and its preparation method and application
  • Inner surface hydrophilic modified hollow fiber membrane and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] (1) A polypropylene (PP) hollow fiber membrane (purchased from Germany MEMBRANA company, model PP S6 / 2) with an average pore size of 0.2-0.3 μm, an inner diameter of 1800 μm, and a film thickness of 450 μm was used as the base membrane, according to figure 1 , making 200 base membranes into hollow fiber membrane modules;

[0053] Use absolute ethanol to infiltrate the hollow fiber membrane in the module: inject ethanol into the tube side of the hollow fiber membrane module through the pump, and circulate for 20 minutes;

[0054] (2) Put the infiltrated hollow fiber membrane module into the circulating flow device with the pump as the core (such as figure 2 shown), add 100mg copper sulfate pentahydrate, 160mg dopamine hydrochloride, 160mg polydiallyldimethyl Ammonium chloride (PDDA, 200000Da) and 160 μL of hydrogen peroxide were prepared into a reaction solution, which was circulated in the tube side of the hollow fiber membrane for 30 minutes;

[0055] After the reac...

Embodiment 2～9

[0058] Regulate the add-on of dopamine hydrochloride and PDDA, make the concentration of dopamine hydrochloride and PDDA in the reaction solution respectively as shown in table 1, other conditions are the same as embodiment 1.

[0059] The surface hydrophilization modified hollow fiber membranes prepared in Examples 1 to 9 were tested for performance. The test items were the water contact angle on the inner surface of the hollow fiber membrane, the oil contact angle on the inner surface, the oil flux and the water retention rate, and the results As shown in Table 1.

[0060] Table 1 The performance test results of the surface hydrophilized modified hollow fiber membranes prepared in Examples 1 to 9

[0061]

[0062] From the test data in Table 1, it can be known that the change of dopamine concentration and polydiallyldimethylammonium chloride (PDDA) concentration has a great influence on various properties of the hollow fiber membrane.

Embodiment 10～13

[0064] In Examples 10 to 13, the reaction time of the reaction solution in the tube side of the hollow fiber membrane was adjusted to 45 min, 60 min, 75 min and 90 min, and other conditions were the same as in Example 1.

[0065] Performance tests were performed on the hollow fiber membranes prepared in Example 1 and Examples 10-13 with the inner surface hydrophilized modification, and the test results are shown in Table 2.

[0066] Table 2 Performance Test Results of the Surface Hydrophilic Modified Hollow Fiber Membrane Prepared in Example 1 and Examples 10-13

[0067]

[0068] From the test data in Table 2, it can be seen that with the increase of the reaction time, the hydrophilicity of the inner wall of the hollow fiber membrane increases, while the oil flux and retention rate show a downward trend.

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Abstract

The invention discloses a preparation method of a modified hollow fiber membrane with a hydrophilic inner surface. The preparation method comprises the following steps of: (1) infiltrating a hydrophobic hollow fiber base membrane by using an alcohol solvent; (2) introducing a reaction solution containing an oxidizing agent, a polyphenol compound and a demulsifier into the infiltrated hollow fiberbase membrane, and performing a reaction for 5-100 minutes; and (3) performing cleaning and drying on the reacted hollow fiber base membrane to obtain the modified hollow fiber membrane. The inventionalso discloses the modified hollow fiber membrane which has the hydrophilic inner surface and is prepared by using the preparation method and application of the modified hollow fiber membrane. The modified hollow fiber membrane with the hydrophilic inner surface is a hollow fiber membrane with a hydrophilic inner surface and a hydrophobic outer surface, and can be applied to efficient recycling of an oil phase in emulsion.

Description

technical field [0001] The invention relates to the field of membrane science and technology, in particular to a hollow fiber membrane with a hydrophilic inner surface modification and a preparation method and application thereof. Background technique [0002] With the progress of society and the development of industry, the problem of water pollution increasingly threatens the survival and development of human beings. Among them, the oily wastewater in industrial production (mainly from petroleum, petrochemical, steel, coking, mechanical processing and other industries) will settle together with the suspended particles and iron oxide scale in the wastewater in the process facilities and pipeline equipment, forming oily sludge and clogging Pipelines and equipment affect the normal production; if the oily wastewater is discharged directly into the environment, it will have many impacts, such as polluting the water body, forming an oil film on the water surface, hindering the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/82B01D67/00B01D69/02B01D69/08B01D17/022B01D17/04
CPCB01D17/045B01D17/085B01D67/0093B01D69/02B01D69/08B01D71/82B01D2325/36
Inventor 徐志康陈志雄林福文李浩南杨熙
Owner ZHEJIANG UNIV
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