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Super-hydrophilic composite membrane suitable for oil-water separation in severe environment and preparation method of super-hydrophilic composite membrane

An oil-water separation and composite membrane technology, which is applied in separation methods, liquid separation, semi-permeable membrane separation, etc., can solve the problem that polymer membranes cannot meet the requirements of direct separation of high-temperature oily wastewater, the micro-nano structure is easy to fall off, and the pollution resistance is not strong. problems, to achieve the effect of improving anti-pollution performance, high mechanical strength, and good anti-destructive performance

Active Publication Date: 2021-07-23
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although great progress has been made in recent years, there are still some deficiencies: (1) the micro-nanostructures produced by surface modification are easy to fall off in complex environments, resulting in reduced wettability; (2) the above-mentioned polymer films cannot meet the specified requirements. Direct separation of high-temperature oily wastewater in the field; (3) The current phase conversion separation membrane is not strong in pollution resistance during the oil-water separation process, resulting in low separation efficiency

Method used

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  • Super-hydrophilic composite membrane suitable for oil-water separation in severe environment and preparation method of super-hydrophilic composite membrane
  • Super-hydrophilic composite membrane suitable for oil-water separation in severe environment and preparation method of super-hydrophilic composite membrane
  • Super-hydrophilic composite membrane suitable for oil-water separation in severe environment and preparation method of super-hydrophilic composite membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043]S1: 2,6-dichlorobenzonitrile, bisphenol A, phenolphthalein and N-methylpyrrolidone are used as raw materials in a 1:0.5:0.5 molar ratio; toluene is used as a water-carrying agent; N,N-dimethyl formamide as solvent. The system is heated to 145±2°C with stable water, and after about 3 hours of reaction, the system is basically completed with water; then the water and toluene in the system are removed, and the system is maintained at 190±1°C for about 2 hours to achieve the target viscosity, and the material is discharged in the deionized It is solidified in the mixed solution of water and ethanol, and then the remaining solvent, toluene and inorganic salts are removed by crushing and boiling the material for about 5 times, and it is vacuum-dried at 145°C for 5 hours before use.

[0044] S2: According to mass percentage, 15 parts of PEN-COOH, 10 parts of pore-forming agent and 75 parts of organic solvent are prepared into a casting solution. Pour the casting solution on th...

Embodiment 2～4

[0047] The only difference with Example 1 is that in S3, the components of the soaking system are different, as shown in Table 1:

[0048] Table 1 Example 1~4 Soaking System Component Table

[0049] Example 1 Example 2 Example 3 Example 4 DA (mg) 40 40 60 50 PEI (mg) 60 70 50 60 TiO 2 (mg / mL)

experiment example 1

[0059] The constant pressure vacuum filtration system was used to test the water flux and retention rate.

[0060] The water flux test conditions are as follows: test pressure 0.09MP, test temperature 25°C, membrane sample size and diameter 4cm, membrane effective area 12.56cm 2 , all samples should be tested for more than 5 minutes, and the same sample should be tested at least 5 times to ensure the accuracy of the experimental data.

[0061] The water flux calculation formula is as follows:

[0062] Jwo=V / (A·t)

[0063] In the formula: Jwo is the pure water flux of the membrane, L / (m2 h); V is the permeate volume, m3; A is the effective area of ​​the membrane, m2; t is the effective time of the membrane being tested, h.

[0064] The test conditions for emulsion retention rate are as follows: Take 5 mL of alkane reagent and add 100 mL of deionized water containing surfactant to ultrasonic for 20 minutes to form a stable oil-in-water emulsion. The test pressure is 0.09MP, t...

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Abstract

The invention provides a preparation method of a super-hydrophilic composite membrane suitable for oil-water separation in a severe environment, and the preparation method comprises the following steps: S1, mixing dichlorobenzonitrile, bisphenol A, phenolphthalein and N-methyl pyrrolidone, and carrying out dehydration azeotropy and copolymerization at a high temperature; cooling, precipitating in a precipitating agent, separating, adding diluted hydrochloric acid for acidification, and drying to obtain a PEN-COOH product; S2, preparing a membrane casting solution from the PEN-COOH product obtained in the S1, a pore-forming agent and an organic solvent, pouring the membrane casting solution on a non-woven fabric, and obtaining a PEN-COOH base membrane with a groove rough structure by using a non-solvent phase inversion method; and S3, adding dopamine, polyethyleneimine and titanium dioxide to the PEN-COOH base membrane obtained in the S2, and obtaining the PEN-COOH / TiO2 composite membrane through a bionic one-step cross-linking soaking method. The invention further provides the super-hydrophilic composite membrane suitable for oil-water separation in the severe environment, and the super-hydrophilic composite membrane still has a good oil-water separation effect in a high-temperature, strong-acid and strong-alkali environment and is long in service life.

Description

technical field [0001] The invention relates to the technical field of polymer composite membrane material preparation and its application, in particular to a superhydrophilic composite membrane suitable for oil-water separation in harsh environments and a preparation method thereof. Background technique [0002] In modern industry, membrane separation technology has become an important technology in the transformation of industrial technology in the fields of industrial pollution, domestic wastewater treatment, oil spills, etc. , Membrane fouling is also a major drawback of membrane separation technology and remains a huge challenge. Therefore, it is of great significance to develop high-performance membrane separation materials. [0003] At present, various separation membranes are mainly prepared using common polymers based on non-solvent phase technology, including polyacrylonitrile, polypropylene, polydifluorinated polyethylene, etc. However, the hydrophobicity of the...

Claims

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Application Information

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IPC IPC(8): B01D71/52B01D71/02B01D69/12B01D69/02B01D67/00B01D17/022
CPCB01D71/52B01D71/024B01D69/125B01D69/02B01D67/0079B01D17/0202B01D2325/36
Inventor 张桂源詹迎青杨威奉庆萤董洪雨孙傲胡佳欣赵书梅
Owner SOUTHWEST PETROLEUM UNIV
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