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Cellulose asymmetric hollow fiber ultrafiltration membranes and preparation method thereof

A cellulose and asymmetric technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of weakened acid and alkali resistance, poor mechanical strength of cellulose, and destruction of natural characteristics of cellulose. Achieve high anti-pollution ability, simple method and process, and good chemical stability

Inactive Publication Date: 2007-08-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical method destroys the original natural characteristics of cellulose, which makes the mechanical strength of cellulose worse and the resistance to acid and alkali is weakened.

Method used

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  • Cellulose asymmetric hollow fiber ultrafiltration membranes and preparation method thereof
  • Cellulose asymmetric hollow fiber ultrafiltration membranes and preparation method thereof
  • Cellulose asymmetric hollow fiber ultrafiltration membranes and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] 32 grams of cellulose (average degree of polymerization ≈ 1000), 0.16 grams of propyl gallate (0.5% of cellulose weight), 16 grams of PEG400 (50% of cellulose weight) added 352 grams of NMMO H 2In O, stir at 95°C for 24 hours under the protection of nitrogen to dissolve completely. After vacuum defoaming, a casting solution with a cellulose concentration of 8% is obtained, and then put into a spinning tank for dry-wet spinning. The spinning temperature is 80°C, the dry spinning distance is 70mm, the core fluid is deionized water, and the core fluid flow rate is 0.8ml min -1 , the gel bath is water, and the temperature of the water bath is 50°C. The spun cellulose hollow fiber membrane was washed in flowing deionized water for 24 hours and placed in 50% glycerol aqueous solution for standby. The scanning electron microscope showed that the membrane was an asymmetric structure (see Fig. 1a, Fig. 1b), and the pure water flux of the membrane 7.68L·m -2 h -1 , bovine seru...

Embodiment 2

[0054] 38.3 grams of cellulose (average degree of polymerization ≈ 1000), 0.19 grams of propyl gallate (0.5% of the weight of cellulose) was added to 440 grams of NMMO·H 2 In O, stir at 90°C for 24 hours under the protection of nitrogen to completely dissolve. After vacuum defoaming, a casting solution with a cellulose concentration of 8% is obtained, which is put into a spinning tank for dry-wet spinning. The dry spinning distance is 50mm, the spinning temperature is 80°C, the core liquid is deionized water, and the flow rate is 0.8ml min -1 , the gel bath is water, and the temperature is 50°C. The spun cellulose hollow fiber membrane was washed in flowing deionized water for 24 hours, and then placed in 50% glycerol aqueous solution for use. After characterization, the pure water flux of the membrane is 5.26 L m -2 h -1 , The bovine serum albumin retention rate was 61%.

Embodiment 3

[0056] Add 42 g of cellulose (average degree of polymerization ≈ 1000), 0.2 g of propyl gallate to 480 g of NMMO·H 2 In O, stir at 95°C for 24 hours under the protection of nitrogen to dissolve completely. After vacuum defoaming, a casting solution with a cellulose concentration of 8% is obtained, which is put into a spinning tank for dry-wet spinning. The dry spinning distance is 100mm, the spinning temperature is 90°C, the core fluid is deionized water, and the flow rate is 0.6ml min -1 , the gel bath is water, and the temperature is 20°C. The spun cellulose hollow fiber membrane was washed in flowing deionized water for 24 hours, and then placed in 50% glycerol aqueous solution for use. After characterization, the pure water flux of the membrane is 4.89L m -2 h -1 , The bovine serum albumin rejection rate was 41%.

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Abstract

A cellulose hollow fiber ultrafiltration membrane with figure-type hole support layer dissymmetrical structure; the process is: 1) mixing, solving and debubbling the NMMO .H2O 88-93wt% with and fiber in 95DEG C to prepare uniform casting film solution which cellulose concentration is 7-12wt%; 2) weaving the residual solvent in films; 4) plasticizing it with 30% -50% glycerol and preparing the wet hollow film. Compared with traditional renewable and modified cellulose film, the crystallinity, mechanical strength, the capabilities of resistance organic solvents, alkali and acid of the hollow film is good, the anti-pollution capability is stronger, and the water treatment prospect is good.

Description

technical field [0001] The invention relates to polymer separation membrane technology, in particular to a cellulose asymmetric hollow fiber ultrafiltration membrane. [0002] The present invention also relates to a preparation method of the above-mentioned cellulose asymmetric hollow fiber ultrafiltration membrane. Background technique [0003] Membrane method has the advantages of direct separation, energy saving, and low cost. It can replace traditional separation technology and is a high-tech solution to the energy crisis and environmental pollution faced by human beings. Ultrafiltration membranes are widely used in water treatment, medical and food industries due to their low operating pressure. However, in the practical application of ultrafiltration membranes, the filtration resistance caused by membrane fouling continues to increase, and the membrane filtration flux is severely attenuated, which hinders the application and promotion of this technology. At present, ...

Claims

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Application Information

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IPC IPC(8): B01D69/08B01D71/10
Inventor 曹义鸣李红剑介兴明刘健辉金培涛袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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