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Cellulose triacetate/polyamide composite membrane and application thereof

A technology of cellulose triacetate and polyamide, which is applied in membrane technology, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of cumbersome preparation process, water flux and salt interception rate not significantly improved, and achieve Wide range of sources, high mechanical strength, and good salt interception rate

Inactive Publication Date: 2018-03-16
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the results show that the cellulose acetate membrane only increases the mass transfer resistance of water, and does not significantly improve the water flux and salt interception rate, and its preparation process is cumbersome.

Method used

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  • Cellulose triacetate/polyamide composite membrane and application thereof
  • Cellulose triacetate/polyamide composite membrane and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Mix triacetate cellulose and mixed diluent at a mass ratio of 10:90, wherein the mixed diluent is composed of dimethyl sulfone and polyethylene glycol 400 at a mass ratio of 70:30, and heat in an oil bath at 160°C Stir until homogeneous solution. After standing at constant temperature for 15 minutes to defoam, quickly pour the solution into a polyester mesh mold preheated at 140°C, apply the film, and place it in an air bath at 140°C for 10 seconds. Subsequently, the liquid film and the mold were immersed in a coagulation water bath at 10 °C, and the prepared nascent film was taken out after 10 minutes. It was soaked in deionized water for 24 hours to completely extract the solvent to obtain a porous membrane of cellulose triacetate. The above-mentioned cellulose triacetate porous membrane was immersed in a 3.4wt% m-phenylenediamine aqueous solution for 2 minutes, and the redundant m-phenylenediamine droplets on the surface of the porous membrane were removed with a ru...

Embodiment 2

[0026] Mix triacetate cellulose and mixed diluent at a mass ratio of 10:90, wherein the mixed diluent is composed of dimethyl sulfone and polyethylene glycol 400 at a mass ratio of 70:30, and heat in an oil bath at 160°C Stir until homogeneous solution. After standing at constant temperature for 15 minutes to defoam, quickly pour the solution into a polyester mesh mold preheated at 140°C. After coating the film, place it in an air bath at 140°C for 10 seconds. Subsequently, the liquid film and the mold were immersed in a coagulation water bath at 30°C, and the nascent film was taken out after 10 min. Soak it in deionized water for 24 hours to completely extract the solvent to obtain a wet state cellulose triacetate porous membrane. Immerse the above-mentioned cellulose triacetate porous membrane in 3.4wt% m-phenylenediamine aqueous solution for 2min, remove excess m-phenylenediamine large droplets on the surface of the porous membrane with a rubber roller and dust-free paper,...

Embodiment 3

[0029] Mix triacetate cellulose and mixed diluent at a mass ratio of 10:90, wherein the mixed diluent is composed of dimethyl sulfone and polyethylene glycol 400 at a mass ratio of 70:30, and heat in an oil bath at 160°C Stir until homogeneous solution. After standing at constant temperature for 15 minutes to defoam, quickly pour the solution into a polyester mesh mold preheated at 140°C. After coating the film, place it in an air bath at 140°C for 10 seconds. Subsequently, the liquid film and the mold were immersed in a coagulation water bath at 50°C, and the nascent film was taken out after 10 min. Soak it in deionized water for 24 hours to completely extract the solvent to obtain a wet state cellulose triacetate porous membrane. Immerse the above-mentioned cellulose triacetate porous membrane in 3.4wt% m-phenylenediamine aqueous solution for 2min, remove excess m-phenylenediamine large droplets on the surface of the porous membrane with a rubber roller and dust-free paper,...

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Abstract

The invention discloses a cellulose triacetate / polyamide composite membrane and an application thereof. The composite membrane is built based on a cellulose triacetate porous membrane, a polyamide ultra-thin membrane is built by an interfacial polymerization method, and the cellulose triacetate porous membrane and the polyamide ultra-thin membrane are compounded to form the composite membrane. Thecomposite membrane organically combines the advantages of good hydrophily, pore structure, easiness in regulation, large water flux and the like of the cellulose triacetate porous membrane with the advantages of high salt rejection and the like of the polyamide ultra-thin membrane. The cellulose triacetate / polyamide composite membrane is low in raw material cost, long in service life and excellent in pollution resistance. A preparation method is simple in process, easy to operate, strong in universality, mild in condition and applicable to preparation of a nano-filtration membrane, a forwardosmosis membrane, a reverse osmosis membrane, a pressure delay osmosis membrane and the like.

Description

technical field [0001] The invention belongs to the field of polymer membrane separation technology manufacturing, and specifically relates to a cellulose triacetate / polyamide composite membrane and its application. Background technique [0002] In recent years, membrane separation technology has been widely used in pure water purification, sewage treatment, food concentration, seawater desalination, gas separation and other fields due to its simple operation, high efficiency and environmental protection. With the advancement of technology, the preparation and application of thin-film composite permeable membranes have developed rapidly, and the requirements for the performance of permeable membranes are also getting higher and higher. The structure of thin film composite permeable membrane generally consists of three parts: polyamide ultra-thin separation layer with selective permeation performance, porous support layer and reinforcement layer (non-woven fabric or polyester...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D67/00
CPCB01D67/0006B01D69/125
Inventor 吴青芸邢小燕谢梦云顾林
Owner NINGBO UNIV
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