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Separation membrane made from cellulose and its preparing method

A cellulose membrane and cellulose technology, applied in the field of preparation of polymer separation membranes, can solve the problems of weak resistance to biological erosion, destroy the natural characteristics of cellulose, and reduce the degree of polymerization, and achieve good osmotic separation performance and temperature resistance. Enhanced, simple film-making process

Inactive Publication Date: 2006-01-11
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

[0003] These treatments narrow the range of application of cellulose membranes, and the application conditions are limited.
For example, cellulose acetate film is easy to hydrolyze, has weak anti-biological erosion, and has strict requirements on the applicable range of pH value (pH4-8) during use; so far, the industrial viscose method to prepare rayon and cellophane technology, and the existing The production of cellulose silk and non-woven fabrics by the copper ammonia method with a history of more than 50 years has the disadvantage that chemical methods destroy the original natural characteristics of cellulose.
Not only in the process of chemical modification, cellulose is degraded and denatured, the degree of polymerization is reduced, the degree of crystallinity is reduced, the mechanical strength is deteriorated, and the acid and alkali resistance is weakened, and there are serious environmental pollution problems in the production, such as viscose method The CS2 in the process cannot be recovered and the residual copper in the copper ammonia process damages the water quality, etc.

Method used

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  • Separation membrane made from cellulose and its preparing method
  • Separation membrane made from cellulose and its preparing method
  • Separation membrane made from cellulose and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 3.2 grams of cellulose (average degree of polymerization ≈1000) to 32 grams of MMNO solvent containing 13.3wt.% water, stir at 80°C for 24hrs under nitrogen protection, filter, and defoam to obtain a casting solution with a concentration of 10wt.%. At 110°C, cast the casting solution onto a smooth, clean glass plate, add 32 grams of MMNO solvent containing 13.3wt.% water to 3.2 grams of cellulose (average degree of polymerization ≈ 1000) with a spatula, at 80°C, Stir for 24 hours under the protection of nitrogen, filter, and defoam to obtain a casting solution with a concentration of 10 wt.%. At 110°C, cast the casting solution onto a smooth, clean glass plate, scrape it with a scraper to form a 150 μm thick film, and then immerse it in a hydrogel bath to cure for 24 hours. After immersing in the gel, a gel-state film is obtained, and after being fully washed, the solid cellulose film is obtained by drying at room temperature and a relative humidity of 85%. The fil...

Embodiment 2

[0041] Except using the drying condition of relative humidity 50%, other implementation steps are the same as embodiment 1. The tensile strength σ of the prepared film b , elongation at break ε b The lengths are 92.4MPa and 4.4%, respectively.

Embodiment 3

[0043] the solution

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Abstract

A cellulose membrane for separating Co2, SO2 hydrogen sulfide, etc is prepared from N-methyl morpholine oxide (MMNO) and cellulose through proportionally mixing, stirring for dissolving, defoaming to obtain membrane casting liquid, forming liquid membrane on glass plate by doctor blading process, coagulating and slowly drying. Its advantages are high crystallinity, mechanical strength and resistance to high temp, acid and alkali, and good osmotic separation performance.

Description

technical field [0001] The invention belongs to the preparation technology and application direction of polymer separation membranes. Specifically, N-methylmorpholine oxide (MMNO) solvent is used to directly dissolve cellulose to prepare a casting solution to prepare a cellulose separation membrane, which is applied in the field of liquid and gas separation. Background technique [0002] Plant cellulose is the most abundant renewable resource on the earth and is an environmentally friendly material. It is of great practical significance to make full use of cellulose. From the chemical structure point of view, cellulose is a chain polymer compound composed of D-glucosyl groups, each glucosyl ring contains 3 hydroxyl groups, and has excellent hydrophilicity and acid and alkali resistance. However, due to the polyhydric characteristics of cellulose, there are extremely strong hydrogen bonds between cellulose molecules. Macroscopically, cellulose is characterized by high cryst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/10C08J9/28
Inventor 袁权吴江曹义鸣
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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