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Preparation and usage of hollow cellulose gas humidification membrane

A technology of gas humidification and cellulose, applied in the fuel cell gas humidification system, the preparation field of cellulose hollow fiber gas humidification membrane, which can solve the problem of acid and alkali resistance, organic solvent resistance, and limited application fields , environmental pollution and other issues, to achieve the effect of good acid and alkali resistance, good application prospects, and strong hydrophilicity

Inactive Publication Date: 2005-06-01
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • 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 production, such as CS in the production of cellophane in the viscose process 2 Unable to recycle, residual copper in cupro ammonia process will cause damage to water quality, etc.

Method used

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  • Preparation and usage of hollow cellulose gas humidification membrane
  • Preparation and usage of hollow cellulose gas humidification membrane
  • Preparation and usage of hollow cellulose gas humidification membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 10 grams of cellulose (average degree of polymerization ≈ 1000), 0.05 g of propyl gallate (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.

[0034] The gas permeation rate of the prepared dense cellulose hollow ...

Embodiment 2

[0048] Such as figure 2 As shown, the cellulose hollow air humidification membrane prepared in Example 1 is assembled into a module suitable for a 5KW fuel cell stack humidification system, and the total area of ​​the membrane is 7000cm 2 . When the water-air pressure difference is 0.1MPa, the water permeability of the module reaches 1.6ml / min, which can meet the humidification requirements of raw gas. At the same time, when the dew point of the raw material gas is -15°C, the humidification performance at the maximum gas flow rate under different gas pressures and the influence of the gas flow rate on the humidification performance at 0.2 MPa are tested, and the results show a good humidification effect. The specific results are attached image 3 , 4 , 5 shown.

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Abstract

The hollow cellulose fiber gas humidifying membrane is homogeneous compact structure prepared through direct dissolving cellulose with N-methyl morpholine monohydrate as solvent and spinning vian immersing phase converting process. The preparation process includes: dissolving cellulose with 80-93 % concentration MMNO.H2O at 80-110 deg.c and debubbling to obtain membrane forming liquid of 7-20 wt% cellulose concentration; spinning hollow membrane through immersing phase converting process; washing to eliminate residual solvent in the membrane; and drying naturally to obtain dry hollow membrane. The cellulose fiber gas humidifying membrane thus prepared has high crystallization degree, high mechanical strength, high organic solvent, acid and alkali resistance, high water penetrating capacity, and small oxygen and hydrogen osmosing coefficient, and is very suitable for use in gas humidifying system in fuel cell.

Description

Technical field: [0001] The invention relates to polymer membrane technology, in particular to the preparation of a cellulose hollow fiber gas humidification membrane and its application in a fuel cell gas humidification system. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/08B01D71/10H01M4/94
CPCY02E60/50
Inventor 刘健辉介兴明林斌曹义鸣袁权
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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