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Method for dissolving cellulos

A technology for dissolving cellulose and cellulose, applied in the field of dissolving cellulose, can solve the problems of low solubility, long dissolving time, and industrialization limitations, and achieve the effects of mild temperature range, simple and convenient operation, and reduced energy consumption

Inactive Publication Date: 2007-09-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese patent 00114486.3 discloses a solvent composition for dissolving cellulose and is used for dissolving cellulose. The solvent composition can only dissolve cellulose with a smaller molecular weight (less than 8.5×10 4 ), and the dissolution time is long (more than 12 hours), and the solubility is small, so the industrialization is greatly limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take regenerated cellulose (non-woven fabric M η =15×10 4 ) 10 grams, add 95 grams of 14wt% NaOH aqueous solution, stir for 5 minutes, then pre-cool in the refrigerator to 0 ° C, take out and stir well, add 95 grams of 20 wt % urea aqueous solution at 5 ° C, at room temperature (25 ° C ) to obtain a transparent cellulose solution after stirring evenly. The total time for dissolving cellulose is within 10 minutes, and the dissolving speed is very fast. The cellulose content in the prepared cellulose solution is 5 wt%, the NaOH content is about 7 wt%, the urea content is about 10 wt%, and the rest is water.

Embodiment 2

[0016] 90 grams of 20wt% NaOH aqueous solution are precooled to 10 ℃ in refrigerator, get cotton linter pulp immediately (viscosity-average molecular weight M η =8×10 4 ) 8 grams into it, fully stirred (about 3 minutes), then quickly added 102 grams of water at 10 ° C, and stirred evenly at room temperature (25 ° C) (about 5 minutes) to obtain a transparent cellulose solution. The speed of dissolving cellulose is very fast, and the total time of dissolving is within 10 minutes. The cellulose content in the prepared cellulose solution is 4 wt%, the NaOH content is 9 wt%, and the rest is water.

Embodiment 3

[0018] 100 grams of 12wt% NaOH aqueous solution are precooled to-4 ℃ in refrigerator, get cotton linter pulp immediately (viscosity-average molecular weight M η =6×10 4 ) 10 grams into it, fully stirred evenly (about 4 minutes), then quickly added 90 grams of 40wt% urea aqueous solution at 15°C, and stirred evenly at room temperature (25°C) (about 5 minutes) to obtain a transparent cellulose solution . The speed of dissolving cellulose is very fast, and the total time of dissolving is within 10 minutes. In the prepared cellulose solution, the cellulose content is 5 wt%, the NaOH content is 6 wt%, the urea content is 18 wt%, and the rest is water.

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Abstract

The invention discloses a method for dissolving the cellulose, including having the sodium hydroxide and urea as material, firstly pre-cooling the 12-20 wt.% of sodium hydroxide water solution to -4-10 DEG C, adding cellulose to produce an alkaline cellulase, or mixing the cellulase and 12-20 wt.% of sodium hydroxide water solution, mixing and pre-cooling to -4-10 DEG C to produce an alkaline cellulase, than adding -4-10 DEG C 0-40 wt.% urea water solution, blending uniformly, immediately getting the transparent cellulose solution. The method can swiftly dissolve the natural cellulose with a molecular weight under 13*104 and the II-type cellulose with a molecular weight under 15*104 and may obtain a dense cellulose solution with a high solubility (100%).

Description

technical field [0001] The invention relates to a method for dissolving cellulose. Background technique [0002] Entering the 21st century, science and technology have turned to raw materials for renewable resources and energy, as well as environmentally friendly materials and sustainable technologies and processes. Plant cellulose is the most abundant renewable resource on the earth, and it is an environmentally friendly material. Making full use of cellulose can not only protect the environment, but also save limited petroleum resources. However, the cellulose dissolution process in the existing cellulose industry is complicated, costly and polluting. So far, the production of rayon and cellophane by the viscose method has been industrialized on a large scale, and a large amount of CS is produced in the production process. 2 And seriously pollute the environment. The production of cupro ammonia rayon by cupro ammonia method also has the problems of environmental polluti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B1/08
Inventor 张俐娜祁海松
Owner WUHAN UNIV
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