Gas separation film made of cellulosic hollow fiber and the preparation process thereof

A gas separation membrane and cellulose technology, applied in separation methods, semi-permeable membrane separation, dispersed particle separation, etc., can solve the problems of acid and alkali resistance, organic solvent resistance decline, CS2 cannot be recycled, and limit application fields, etc., to achieve Good acid and alkali resistance, protection of natural characteristics and biocompatibility, simple film making process

Inactive Publication Date: 2004-03-31
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During these treatments, cellulose is often degraded, and the acid and alkali resistance and organic solvent resistance are reduced, which directly limits its application fields. field
At the same time, there are serious environmental pollution problems in the production process, such as CS2 cannot be recycled in the production of cellophane in the viscose process, and residual copper in the cupro ammonia process will damage the water quality, etc.

Method used

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  • Gas separation film made of cellulosic hollow fiber and the preparation process thereof
  • Gas separation film made of cellulosic hollow fiber and the preparation process thereof
  • Gas separation film made of cellulosic hollow fiber and the preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 10 grams of cellulose (average degree of polymerization ≈ 1000), 0.05 g of propyl ester (0.5% of the weight of the cellulose) was added to 90 grams of MMNO·H 2 In O, stir at 80°C for 24hr under the protection of nitrogen to dissolve completely. After vacuum defoaming, a casting solution with a cellulose concentration of 10wt.% is obtained, and then put into a spinning tank for wet spinning. The spinning temperature is 80°C, the core fluid is deionized water, the flow rate is 0.4ml / min, the gel bath is water, and the temperature of the water bath is room temperature. The spun cellulose hollow fiber membranes were washed in flowing deionized water for 24 hours and then dried in air. Scanning electron microscopy showed that the film was homogeneous and dense (such as figure 1 ). The inner / outer diameter of the hollow fiber membrane is 0.42mm / 0.72mm, and the thickness of the dense layer is 0.15mm.

[0031] The gas permeation rate of the prepared dense cellulose hollow me...

Embodiment 2

[0043] 18 grams of cellulose (average degree of polymerization ≈ 2000), 5 grams of MgSO 4 (5% of casting solution weight) add 82 grams of MMNO H 2 In O, stir at 110°C for 24hr under the protection of nitrogen to dissolve completely. After vacuum defoaming, a casting solution with a cellulose concentration of 18wt.% is obtained, and then put into a spinning tank for dry-wet spinning. The spinning temperature is 110°C, the dry spinning distance is 450mm, the core liquid is a mixture of deionized water / methanol / acetone (80 / 10 / 10wt.%), the flow rate of the core liquid is 0.4ml / min, the gel bath is water, and the temperature of the water bath is 60 ℃. The spun cellulose hollow fiber membranes were washed in flowing deionized water for 24 hours and then air-dried. The gas permeation rate of the cellulose hollow membrane was measured. CO 2 The penetration rate reaches 42×10 -8 cm 3 (STP) / (cm 2 *s*cmHg), separation coefficient α(CO 2 / N 2 ) is 50.

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Abstract

A gas separating film of hollow fibers from cellulose and its preparation. The film has an even and compact texture. Solving cellulose directly by the aqueous solution of methyl morpholine oxide, spinning hollow fibers of cellulose by an immersing phase conversion method. The preparation method is:1) mixing 80í½93úÑ of MMNOíñH2O by weight with cellulose, and debubbling, obtaining a transparent casting-film solution containing 7í½20úÑ of cellulose by weight;2) spinning hollow fibers by an immersing phase conversion method;3) wash off residual solvent in the film; 4) drying naturally with the relative humidity of 40úÑí½90úÑ, getting dried hollow film. Compared with traditional regenerative and modified cellulose films, the hollow film is better in crystallization, mechanical strength, capacities of resisting organic solvents, acids and bases, and has great performance in penetrating and separating gases, especially adapts to separate and recycle acidic gases such as CO2 and SO2.

Description

technical field [0001] The invention relates to polymer separation membrane technology, in particular to cellulose hollow fiber gas separation membrane and its preparation. Background technique [0002] Cellulose is the most abundant renewable organic resource in nature, and plants produce hundreds of millions of tons of cellulose every year through photosynthesis. It is a linear macromolecule formed by connecting D-glucopyranose anhydride with β(1-4) glucosinolate bonds. The following figure shows its chemical structural formula (C 6 h 10 o 5 ) n , n is the degree of polymerization. There are three free alcoholic hydroxyl groups on each repeating ring in the molecular structure of cellulose, [0003] [0004] It is easy to absorb water molecules to form hydrogen bonds, so cellulose has strong hydrophilicity, which makes it extremely low in protein adsorption and shows strong pollution resistance. At the same time, due to the characteristics of the polyhydroxy group...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/22B01D69/08B01D71/10
Inventor 曹义鸣袁权介兴明林斌刘健辉
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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