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Preparation method and oil-water separation membrane of high-strength and high-flux oil-water separation membrane

An oil-water separation membrane and high-throughput technology, which is applied in the preparation of oil-water separation membranes and the preparation of oil-water separation membranes, can solve the problems of poor mechanical properties of electrospun membranes

Active Publication Date: 2021-05-11
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, electrospun membranes generally have a disadvantage, that is, poor mechanical properties.

Method used

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  • Preparation method and oil-water separation membrane of high-strength and high-flux oil-water separation membrane
  • Preparation method and oil-water separation membrane of high-strength and high-flux oil-water separation membrane
  • Preparation method and oil-water separation membrane of high-strength and high-flux oil-water separation membrane

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Experimental Materials:

[0037] p-Phenylenediamine, 3,3′, 4,4′biphenyltetracarboxylic dianhydride (BPDA), N,N-dimethylacetamide (DMAC), dichloromethane (DCM), chloroform, tetrachloromethane Carbon dioxide and other solution solvents, cetyltrimethylammonium bromide (CTAB) and dopamine hydrochloride (PDA) and aqueous polytetrafluoroethylene (PTFE) dispersion (solid content is 60%).

[0038] Preparation process of oil-water separation membrane:

[0039] Polyamic acid synthesis:

[0040] Preparation of polyamic acid (PAA) by low-temperature ring-opening addition polymerization: BPDA (2.9422g, 0.01mol), p-phenylenediamine (1.0814g, 0.01mol) and 40mLDMAc were added to a three-necked flask at the same time, and the temperature was reduced to minus 5 in a nitrogen atmosphere. Under the environment of degree Celsius, the reaction was completed after 24 hours of reaction, and the molecular weight distribution of polyamic acid was measured by gel permeation chromatography.

[...

Embodiment 2

[0046] Oil-water separation test:

[0047] (1) Measure 10 mL of dichloromethane and water respectively, wherein the dichloromethane is dyed with oil red, and the water is dyed blue with methylene blue. After the oil-water mixture solution was left to stand for 1 min, the oil-water separation occurred. The water dyed blue is on the upper layer, the red oil is on the lower layer, and the PDA / PTFE-PI nanofiber membrane is fixed between two glass tubes. Then pour the layered mixed solution into the upper glass tube for oil-water separation. The red water is as fast as permeating through the PDA / PTFE-PI nanofiber membrane and flows into the beaker below, while the blue water remains in the upper glass tube, and the time when the oil and water are completely separated and the time before and after the separation are measured. volume of water, such as Figure 4 .

[0048] (2) Select different oil-water mixtures (dichloromethane-water, bromobenzene-water, carbon tetrachloride-wate...

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Abstract

The invention discloses a method for preparing a high-strength and high-flux oil-water separation membrane and the oil-water separation membrane, which include the synthesis of polyamic acid; the preparation of electrospun polyamic acid membrane; the imidization of polyamic acid membrane; Preparation of dopamine-polyimide membrane; preparation of polydopamine / polytetrafluoroethylene-polyimide membrane. The superhydrophobic superoleophilic nanofiber membrane with high flexibility and high mechanical strength prepared by the present invention has the high mechanical strength of polyimide and the lipophilic and hydrophobic properties of polydopamine composite polytetrafluoroethylene dispersion at the same time. characteristic. The modified fiber membrane can effectively separate various oil-water mixtures, and the separation flow rate is as high as 6000L m ‑ 2 h ‑1 , The separation efficiency can reach more than 99%. In addition, the fiber membrane can still maintain high stability under various extreme conditions. The method of preparing the fiber membrane is simple, and it will have a good application prospect in the field of oil-water separation.

Description

technical field [0001] The invention belongs to the technical field of oil-water separation membrane preparation, and in particular relates to a preparation method of a high-strength and high-throughput oil-water separation membrane and the oil-water separation membrane. Background technique [0002] In recent years, the demand for materials capable of effectively and rapidly separating oil-water mixtures and oil-water emulsions has risen rapidly. So far, the existing oil-water separation technology can be divided into the following categories: such as suspension gravity treatment, centrifugal deposition, biological treatment and electrodeposition. However, these technologies more or less have the following disadvantages, such as low separation efficiency, high separation cost, easy to cause secondary pollution, etc., which greatly limit their application. Studies in recent years have shown that membrane-based oil-water separation materials have proven to have good applicat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/64B01D71/60B01D71/36B01D69/02B01D61/02B01D17/022
CPCB01D17/02B01D61/027B01D69/02B01D71/36B01D71/60B01D71/64B01D2323/39B01D2325/24B01D2325/38
Inventor 黄超伯刘中车马文静
Owner NANJING FORESTRY UNIV
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