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Preparation method of cellulose acetate reverse osmosis membrane surface-modified by quaternary ammonium salt

A cellulose acetate membrane and cellulose acetate technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problems of membrane performance deterioration, achieve low operating pressure, good application prospects, and wide application field effect

Inactive Publication Date: 2021-07-27
ANHUI UNIVERSITY OF ARCHITECTURE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the CA membrane can be used as a nutrient substrate for microorganisms, so some microorganisms can grow on the membrane body, destroy the dense layer of the membrane, and deteriorate the membrane performance.

Method used

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  • Preparation method of cellulose acetate reverse osmosis membrane surface-modified by quaternary ammonium salt
  • Preparation method of cellulose acetate reverse osmosis membrane surface-modified by quaternary ammonium salt
  • Preparation method of cellulose acetate reverse osmosis membrane surface-modified by quaternary ammonium salt

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Experimental program
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Embodiment 1

[0022] After soaking the cellulose acetate film in the aqueous phase dissolved with sodium hydroxide, immerse in the water washing tank, wash until the pH is 7.0, and then enter the modification tank after drying. The solvent in the modification tank is n-hexane, and the solute It is 4-chloromethylbenzoyl chloride, the concentration of the acid chloride solute is 0.3mol / L, it is dried after being replaced by a functional group, and then enters the quaternization tank to modify the surface of the membrane with a quaternary ammonium salt, and the quaternization The amine substance solution is housed in the tank, and then immersed in a water washing tank, the inside of the water washing tank is filled with water, and dried after washing to obtain a cellulose acetate reverse osmosis membrane modified on the surface of a quaternary ammonium salt, and the weight percentage of the amine substance is 10% solution of trialkylamine N-235, average desalination rate 94.11%, water flux 19.9...

Embodiment 2

[0024] After the cellulose acetate membrane is soaked in the water phase dissolved with sodium hydroxide, the concentration of sodium hydroxide is 0.5mol / L, then immersed in the water washing tank, washed until the pH is 6.8, and then dried and then entered into the modification tank. The solvent in the chemical tank is n-hexane, and the solute is 4-chloromethylbenzoyl chloride with a concentration of 0.1mol / L. After being replaced by a functional group, it is dried, and then enters the quaternization tank to modify the surface of the membrane with a quaternary ammonium salt. The quaternization tank is equipped with a solution of 10% trimethylamine with a concentration of 10% by weight, and then immersed in a water washing tank. The water washing tank is filled with water, dried after washing, and obtained acetic acid modified on the surface of the quaternary ammonium salt. Cellulose reverse osmosis membrane, resulting in an average desalination rate of 93.73% and a water flux ...

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Abstract

The invention belongs to the field of functional modification of reverse osmosis membranes, and particularly relates to a preparation method of a cellulose acetate reverse osmosis membrane surface-modified by quaternary ammonium salt. The cellulose acetate reverse osmosis membrane surface-modified by quaternary ammonium salt integrates the advantages of reliability, high desalination characteristic, microbial erosion resistance and the like, has stable separation membrane process, low failure rate, a wider application scope, low main operation pressure, low energy consumption, large flux, high water yield, pollution resistance, stable operation, high desalination rate at high flow rate, high mechanical strength and long service life, can play a role under low operation pressure and can tolerate the influence of chemical or biochemical action. The quaternary amine group cellulose acetate reverse osmosis membrane is prepared by introducing quaternary amine groups, so the hydrolysis resistance and the oxidation resistance of the membrane are improved; and the membrane is positively charged by the quaternary amine groups, so the metal cation pollution resistance of the membrane is improved, and the quaternary amine group cellulose acetate reverse osmosis membrane has good practical and economic values.

Description

technical field [0001] The invention belongs to the technical field of functional modification of reverse osmosis membranes, in particular to a preparation method of a cellulose acetate reverse osmosis membrane modified on the surface of a quaternary ammonium salt. Background technique [0002] Currently commonly used reverse osmosis membranes mainly include cellulose acetate membrane (CA) and aromatic polyamide membrane. CA film is an amorphous chain polymer compound without strong hydrogen bonds. Dissolve it in acetone, add formamide or magnesium perchlorate, mix and prepare, filter, cast, and then undergo evaporation, cold water immersion, and heat treatment. , the cellulose acetate membrane can be obtained, and the CA membrane has an asymmetric structure. Its epidermis has a dense structure, with a pore size of 0.8-1.0 nm and a thickness of about 0.25 μm. It plays a key role in the reverse osmosis process and must be in contact with the solution side, and must not be in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D67/00B01D69/02B01D71/16
CPCB01D61/025B01D67/0093B01D71/16B01D69/02B01D2325/30B01D2325/48Y02A20/131
Inventor 程从亮李萍解文杰张峰君胡先海
Owner ANHUI UNIVERSITY OF ARCHITECTURE
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