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Preparation method of fluorine-containing oil-water separation membrane with high oil pollution resistance and stability

A technology for oil-water separation membranes and oil pollution, applied in separation methods, chemical instruments and methods, and separation of immiscible liquids, etc., can solve the problems of membrane permeation flux decline, membrane fouling, etc., and achieve simple preparation methods and high separation efficiency , Improve the effect of oil pollution resistance and stability

Pending Publication Date: 2021-11-19
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention aims to solve the problem of membrane fouling caused by the adhesion of various oil droplets in the process of oil-water separation, resulting in a decrease in membrane permeation flux, and proposes a preparation method for a fluorine-containing oil-water separation membrane with high resistance to oil pollution and stability

Method used

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  • Preparation method of fluorine-containing oil-water separation membrane with high oil pollution resistance and stability
  • Preparation method of fluorine-containing oil-water separation membrane with high oil pollution resistance and stability
  • Preparation method of fluorine-containing oil-water separation membrane with high oil pollution resistance and stability

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Experimental program
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Effect test

Embodiment 1

[0031] Step 1, preparation of basement membrane

[0032] The polyacrylonitrile (PAN) of 3.6g is dissolved in the N of 26.4g, in the N-dimethylformamide solvent, heating and stirring 6h, after vacuum degassing, obtain uniform PAN casting solution; PAN casting solution is added to In the syringe, a No. 22 needle is installed on the syringe. Use the needle of the syringe to inject the PAN casting liquid into the booster of the electrospinning equipment, and adjust the propulsion speed of the booster to 0.08mm / min. The distance between the receivers is 8cm. Cover a layer of tinfoil on the receiver of the electrospinning equipment, set the rotation speed of the receiver to 80r / min, connect the positive high voltage of the high voltage power supply to the needle of the syringe, adjust the voltage to 14.0kV, and then connect the negative voltage of the high voltage power supply to Adjust the voltage to -1.3kV, start the injector, and use the electrospinning equipment to spin for 6h ...

Embodiment 2

[0044] Step 1, preparation of basement membrane

[0045] The polyacrylonitrile (PAN) of 3.6g is dissolved in the N of 26.4g, in the N-dimethylformamide solvent, heating and stirring 6h, after vacuum degassing, obtain uniform PAN casting solution; PAN casting solution is added to In the syringe, a No. 22 needle is installed on the syringe. Use the needle of the syringe to inject the PAN casting liquid into the booster of the electrospinning equipment, and adjust the propulsion speed of the booster to 0.08mm / min. The distance between the receivers is 8cm. Cover a layer of tinfoil on the receiver of the electrospinning equipment, set the rotation speed of the receiver to 80r / min, connect the positive high voltage of the high voltage power supply to the needle of the syringe, adjust the voltage to 14.0kV, and then connect the negative voltage of the high voltage power supply to Adjust the voltage to -1.3kV, start the injector, and use the electrospinning equipment to spin for 6h ...

Embodiment 3

[0051] Step 1, preparation of basement membrane

[0052] The polyacrylonitrile (PAN) of 3.6g is dissolved in the N of 26.4g, in the N-dimethylformamide solvent, heating and stirring 6h, after vacuum degassing, obtain uniform PAN casting solution; PAN casting solution is added to In the syringe, a No. 22 needle is installed on the syringe. Use the needle of the syringe to inject the PAN casting liquid into the booster of the electrospinning equipment, and adjust the propulsion speed of the booster to 0.08mm / min. The distance between the receivers is 8cm. Cover a layer of tinfoil on the receiver of the electrospinning equipment, set the rotation speed of the receiver to 80r / min, connect the positive high voltage of the high voltage power supply to the needle of the syringe, adjust the voltage to 14.0kV, and then connect the negative voltage of the high voltage power supply to Adjust the voltage to -1.3kV, start the injector, and use the electrospinning equipment to spin for 6h ...

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Abstract

The invention provides a preparation method of a fluorine-containing oil-water separation membrane with high oil pollution resistance and stability, and particularly relates to the technical field of oil-water separation. The preparation method comprises the following steps: dissolving polyacrylonitrile in an organic solvent to prepare a membrane casting solution, preparing a base membrane by using an electrostatic spinning process, pretreating the base membrane to form an HPAN membrane with sufficient active sites, and carrying out in-situ polymerization of fluoride on the surface of the HPAN membrane by using an in-situ reaction of an amine monomer and a high-reaction-activity fluorine-containing monomer, and preparing the F-HPAN membrane which is hydrophilic and oleophobic in the air and superoleophobic in the water. The preparation method provided by the invention effectively solves the problem that membrane permeation flux is reduced due to membrane pollution caused by oil drop adhesion in an oil-water separation process, and remarkably improves the water separation capacity, oil pollution resistance and stability of fluorine-containing oil-water separation membrane oil; the fluorine-containing oil-water separation membrane can keep high oil-water separation efficiency all the time in the long-term operation process, the preparation method is simple, batch production is easy, and the product has good industrial application prospects.

Description

technical field [0001] The invention relates to the technical field of oil-water separation, in particular to a method for preparing a fluorine-containing oil-water separation membrane with high oil pollution resistance and stability. Background technique [0002] The petrochemical industry has provided a powerful impetus for the development of human civilization, but frequent oil spills, increased leakage of organic matter, and increased discharge of industrial oily sewage will have a catastrophic impact on the ecosystem and cause huge economic losses. Furthermore, in the field of transportation, the presence of water in fuel increases the risk of engine failure with serious consequences. [0003] Generally oil / water mixtures fall into two categories: stratified oil / water and emulsified oil / water, including oil-in-water and water-in-oil emulsions. Stratified oil / water mixtures with relatively large droplet sizes (>20 μm) are thermodynamically unstable, with the denser p...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/42B01D69/02B01D17/022
CPCB01D67/0006B01D67/0002B01D71/42B01D69/02B01D17/02B01D17/085B01D2325/36B01D2323/02
Inventor 侯影飞王明王梓诚蒋驰诸浩江
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)