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Hollow fiber alloy nano filtering membrane of cellulose triacetate and its production method

A technology of cellulose triacetate and its manufacturing method, which is applied in chemical instruments and methods, membrane technology, semipermeable membrane separation, etc., can solve the problems of poor biocompatibility, strong pH sensitivity, complex separation system, etc., and achieve good resistance Function, large specific surface area, water saving effect

Inactive Publication Date: 2005-11-23
HANGZHOU WATER TREATMENT TECH RES & DEV CENT NAT BUREAU OF OCEANGRAPHY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the cellulose triacetate hollow fiber membrane has excellent desalination performance and chlorine resistance performance, it has poor biocompatibility, low water permeability and strong sensitivity to pH.
There is not much research and development work on the "blending" technology of cellulose triacetate at present, and the nanofiltration membrane made of a single cellulose acetate cannot meet the requirements of more complex separation systems

Method used

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  • Hollow fiber alloy nano filtering membrane of cellulose triacetate and its production method
  • Hollow fiber alloy nano filtering membrane of cellulose triacetate and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-2

[0031] With triacetate cellulose as the matrix phase, polyethersulfone, polyacrylonitrile and polyvinylidene fluoride as the dispersed phase, according to the weight ratio of triacetate cellulose hollow fiber alloy nanofiltration membrane, use 45% triacetate cellulose, 25% Dispersion components (polyethersulfone, polyacrylonitrile, polyvinylidene fluoride), 30% porogen (polyethylene glycol, triethyl phosphate) are dissolved in a mixed solvent of sulfolane and N-methylpyrrolidone. Stir and mix evenly, swell and mature at a constant temperature of 85°C for 24 hours, and granulate to make a spinning material for use. The spinning material is processed by the jelly spinning process and at a suitable temperature, and is pressed into the hollow fiber spinneret with two concentric circles by the gear metering pump through the screw extruder, and the hollow fiber is extruded from the outer circle of the spinneret. Silk liquid, the inner circular hole is filled with nitrogen, the nasce...

Embodiment 3-4

[0036] As in previous examples, according to the above-mentioned manufacturing method, the weight ratio of cellulose triacetate hollow fiber alloy membrane is 85% cellulose triacetate, 5% dispersed components (polyvinylidene fluoride, polymethyl methacrylate), 10 % porogen (polyethylene glycol, glycerin) to prepare triacetate cellulose hollow fiber alloy nanofiltration membrane. The prepared alloy nanofiltration membrane was tested for its removal performance under the conditions of 2000mg / L magnesium sulfate aqueous solution, operating pressure of 1.2MPa, and operating temperature of 25°C.

[0037] Example Dispersed component Water flux, (L / m 2 h) Removal rate, (%)

[0038] 3 polyvinylidene fluoride 27.5 85.3

[0039] 4 Polymethyl methacrylate 25.1 66.4

Embodiment 5-6

[0041] As the manufacturing method of the cellulose triacetate hollow fiber alloy nanofiltration membrane of the previous embodiment 1-2, with 75% cellulose triacetate, 5% dispersion component (polyacrylonitrile, polyether sulfone) 20% porogen ( 1,2-propanediol, triethyl phosphate) to prepare cellulose triacetate hollow fiber alloy nanofiltration membrane. The prepared alloy nanofiltration membrane was tested for its removal performance under the conditions of 2000mg / L magnesium sulfate aqueous solution, operating pressure of 1.2MPa, and operating temperature of 25°C.

[0042] Example Dispersed component Water flux, (L / m 2 h) Removal rate, (%)

[0043] 5 polyacrylonitrile 31.4 75.3

[0044] 6 Polyethersulfone 28.1 73.1

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Abstract

This invention relates to a new cellulose triacetate hollow fiber alloy film, in addition to a preparing method. It mixes the cellulose triacetate and acid, alkali resistance high molecular material to modify, which can decrease the sensitivity of the cellulose triacetate to acid and alkali, and increase the bioavailability and permeable quantity of the film. The film is manufactured with 45-85% cellulose triacetate, 5-25% disperse component, 10-30% pore former. The invention can be widely used in water softening and sea water desalting.

Description

technical field [0001] The invention belongs to a nanofiltration membrane and a manufacturing method, in particular to a hollow fiber alloy nanofiltration membrane and a process made of cellulose triacetate. Background technique [0002] Nanofiltration membrane technology is a new type of membrane separation technology that has developed very rapidly in the past ten years. It is characterized by a high rejection rate for divalent ions or organic compounds with a molecular weight of several hundred or more, and a low rejection rate for monovalent ions. A separation feature that neither reverse osmosis nor ultrafiltration can replace. Therefore, it has been widely used in the advanced treatment of municipal tap water, the softening of low-pressure boiler feed water, the desalination and concentration of dyes, decolorization, and the concentration and separation of biochemical substances. However, the nanofiltration membranes made of other polymer materials are subject to cert...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/16
Inventor 于品早
Owner HANGZHOU WATER TREATMENT TECH RES & DEV CENT NAT BUREAU OF OCEANGRAPHY
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