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Method for preparing high-flux organic solvent nanofiltration membrane from star-shaped molecular compound

A molecular compound and organic solvent technology, which is used in the field of star-shaped molecular compounds to prepare high-throughput organic solvent nanofiltration membranes, can solve problems such as performance that cannot meet practical application requirements, and achieve mild conditions, high permeation flux, and membrane preparation time. short effect

Active Publication Date: 2020-10-27
YANTAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, Li (Journal of membrane science, 2019, 572: 520-531) et al. doped covalent organic framework materials in the polyamide separation layer of organic solvent nanofiltration membranes, which increased the ethanol permeation flux by 46.7%; Karan( Science, 2015, 348(6241): 1347-1351) etc. used cadmium hydroxide nanowires as an intermediate layer to prepare an ultra-thin separation layer with a thickness of about 10 nm, and the permeation flux of organic solvents was increased by 20 times; Jimenez- Solomon (Nature Materials, 2016, 15(7): 760-767) et al. used 5, 5', 6, 6'-tetrahydroxy-3,3, 3', 3'-tetramethylspirobiindene and isobenzene Triformyl chloride reaction prepared polyester organic solvent nanofiltration membrane, which has improved permeation flux for both polar and non-polar solvents, but its performance still cannot meet the needs of practical applications.

Method used

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  • Method for preparing high-flux organic solvent nanofiltration membrane from star-shaped molecular compound
  • Method for preparing high-flux organic solvent nanofiltration membrane from star-shaped molecular compound
  • Method for preparing high-flux organic solvent nanofiltration membrane from star-shaped molecular compound

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Comparison scheme
Effect test

Embodiment 1

[0033] A method for preparing a high-throughput organic solvent nanofiltration membrane from a star molecular compound, comprising the steps of:

[0034] (1) Soak the polyacrylonitrile ultrafiltration membrane in 20% ethanol solution for 5 minutes to remove impurities in the membrane;

[0035] (2) Soak the above-mentioned polyacrylonitrile ultrafiltration membrane in the aqueous phase solution containing m-phenylenediamine monomer at room temperature for 2 minutes, and the concentration is 3%; take out the membrane, and use an air knife to remove the residue on the surface of the membrane droplet, spare;

[0036] (3) Soak the polyacrylonitrile ultrafiltration membrane obtained in (2) into a toluene solution containing a star-shaped molecular compound at room temperature at a concentration of 0.1%, and react for 0.5 min;

[0037] (4) The membrane obtained in (3) was placed in an oven at 80°C and heated for 1 min to obtain a high-throughput organic solvent nanofiltration membra...

Embodiment 2

[0042] A method for preparing a high-throughput organic solvent nanofiltration membrane from a star molecular compound, comprising the steps of:

[0043] (1) Soak the polyacrylonitrile ultrafiltration membrane in 20% ethanol solution for 5 minutes to remove impurities in the membrane;

[0044] (2) Soak the above-mentioned polyacrylonitrile ultrafiltration membrane in the aqueous phase solution containing ethylenediamine monomer for 5 minutes at room temperature, and the concentration is 2%; take out the membrane, and remove the remaining water droplets on the surface of the membrane with an air knife ,spare;

[0045] (3) Soak the polyacrylonitrile ultrafiltration membrane obtained in (2) into a toluene solution containing a star-shaped molecular compound at room temperature at a concentration of 2%, and react for 5 minutes;

[0046] (4) The membrane obtained in (3) was placed in an oven at 70°C and heated for 1 min to obtain a high-throughput organic solvent nanofiltration me...

Embodiment 3

[0049] A method for preparing a high-throughput organic solvent nanofiltration membrane from a star molecular compound, comprising the steps of:

[0050] (1) Soak the polyacrylonitrile ultrafiltration membrane in 40% ethanol solution for 5 minutes to remove impurities in the membrane;

[0051](2) At room temperature, soak the above-mentioned polyacrylonitrile ultrafiltration membrane in the aqueous phase solution containing polyethyleneimine monomer for 2 minutes, and its concentration is 0.5%; take out the membrane, and use an air knife to remove the residue on the surface of the membrane droplet, spare;

[0052] (3) Under the condition of normal temperature, soak the polyacrylonitrile ultrafiltration membrane obtained in (2) into the n-hexane solution containing the star molecular compound and sebacoyl chloride, the concentrations of which are 0.5% and 1.5% respectively, and react 5 min;

[0053] (4) The membrane obtained in (3) was placed in an oven at 60°C and heated for...

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Abstract

The invention discloses a method for preparing a high-flux organic solvent nanofiltration membrane from a star-shaped molecular compound. The method comprises the following main steps: (1) soaking a polyacrylonitrile ultrafiltration membrane into an ethanol solution, and fully washing; (2) soaking the polyacrylonitrile ultrafiltration membrane obtained in the step (1) into a water-phase solution containing an amine monomer, taking out the polyacrylonitrile ultrafiltration membrane, and removing residual water drops on the surface of the membrane by using an air knife or a rubber roller; (3) soaking the polyacrylonitrile ultrafiltration membrane obtained in the step (2) into an organic phase solution containing a star-shaped molecular compound or a mixture of the star-shaped molecular compound and micromolecular acyl chloride, and taking out after reaction; and (4) heating the membrane obtained in the step (3) for a period of time to obtain the high-flux organic solvent nanofiltration membrane. The high-flux organic solvent nanofiltration membrane disclosed by the invention has relatively high solvent permeation flux and solvent resistance. The method is simple to operate, short inmembrane preparation time and mild in condition.

Description

technical field [0001] The invention belongs to the field of membrane filtration, and in particular relates to a method for preparing a high-throughput organic solvent nanofiltration membrane from a star-shaped molecular compound. Background technique [0002] Organic solvent nanofiltration is a new type of membrane separation technology that has emerged in recent years, and has broad application prospects in the fields of food separation, solvent dewaxing, and drug separation. Compared with techniques such as distillation, organic solvent nanofiltration has the advantage of low energy consumption due to the operation at room temperature. The membrane material is the core of organic solvent nanofiltration, and its pore size is about 1 nm, which can separate molecules with a molecular weight of 200-1000 Da from organic solvents. At present, organic solvent nanofiltration membranes mainly have two structures: asymmetric membrane and composite membrane. Asymmetric membranes a...

Claims

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Application Information

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IPC IPC(8): B01D61/00B01D67/00B01D71/42
CPCB01D61/027B01D67/0006B01D71/42
Inventor 翟哲赵玉潮金楠杨浩王清强吕宏缨
Owner YANTAI UNIV