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Cellulose acetate and ultrafiltration membrane blending modification method

A cellulose acetate, blending modification technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of low flux, poor stability, poor compaction resistance and poor mechanical strength of ultrafiltration membranes And other issues

Inactive Publication Date: 2014-05-14
哈尔滨龙利德食品科技开发有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the shortcomings of the existing ultrafiltration membranes, such as low flux, easy pollution, and poor stability, especially the poor compaction resistance and mechanical strength of the cellulose acetate membrane. Through the blending modification with inorganic nanoparticles, Further improve the fouling resistance of the ultrafiltration membrane, increase the membrane flux, and improve the compaction resistance and mechanical strength of the membrane

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Adding nanometer titanium dioxide (TiO2) to cellulose acetate (CA) base material 2 ) particles, wherein the average particle size is 10nm, and the inorganic-organic nanocomposite CA ultrafiltration membrane is prepared by phase separation method, and the porosity, pore size distribution, permeability and scanning electron microscope (SEM) of the membrane surface are measured. The results show that: on the premise of not causing the agglomeration of nanoparticles, adding 4% (mass fraction) of TiO in CA 2 , the porosity after film formation can reach more than 78.6%, and the water permeability of pure water can reach 547L / (m 2 h).

Embodiment 2

[0015] Nano silicon dioxide (SiO 2 ) as an additive, its average particle size is 13nm, acetone and N, N-dimethylformamide (DMF) are co-solvents, and cellulose acetate (CA) / nano-SiO 2 Composite ultrafiltration membrane. The porosity, pore size distribution, and permeability of the membrane were measured, and the prepared CA and CA / SiO were observed with a scanning electron microscope (SEM). 2 Surface structure of composite ultrafiltration membranes.

[0016] The results showed that nano-SiO 2 The addition of inorganic particles can increase the viscosity of the membrane-making solution and increase the porosity of the membrane to 80.3%. With the increase of the porosity, the pore distribution becomes narrower. The addition of inorganic particles will enhance the hydrophilicity of the membrane and further enhance the permeability of the membrane.

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Abstract

The invention relates to a polyvinylidene fluoride ultrafiltration membrane modification method for improving anti-pollution performance of the film. Cellulose acetate as a membrane material is added with hydrophilic nanoparticles to the change membrane hydrophilicity, so as to complete blending modification of the cellulose acetate membrane. The method of the invention has simple operations, effectively improves the interface bonding with matrix to better transfer the stress to inorganic particles, increases permeability of the composite membrane, improves the flexibility and the service life of the membrane, reduces costs, and maintains interception performance of the ultrafiltration membrane. The prepared ultrafiltration membrane has obviously improved hydrophilicity and significantly improved anti-pollution ability.

Description

technical field [0001] The invention relates to a method for modifying a membrane material for water treatment, in particular to a novel blend modification method for a cellulose acetate membrane with large flux, anti-pollution and easy stability. Background technique [0002] Ultrafiltration is a pressurized membrane separation technology, that is, under a certain pressure, the small molecular solute and solvent pass through a special membrane with a certain pore size, so that the macromolecular solute cannot pass through; stay on one side of the membrane, so that Macromolecular substances were partially purified. Due to the advantages of no phase separation, simple operation, low energy consumption and good treatment effect, it is widely used in food industry, biopharmaceutical, water treatment and other industrial fields. However, due to the shortcomings of the existing ultrafiltration membranes in water treatment, such as small flux, easy pollution, and poor stability, ...

Claims

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Application Information

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IPC IPC(8): B01D71/16B01D67/00
Inventor 徐树来左金龙
Owner 哈尔滨龙利德食品科技开发有限公司
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