Cellulose solution and preparation thereof thereof

A cellulose solution and cellulose technology, which is applied in the production of bulk chemicals and other directions, can solve the problems of high production equipment requirements, cellulose oxidative degradation, and difficult processing, and achieve the effect of reducing processing difficulty, uniform and stable degradation, and not easy to degrade.

Active Publication Date: 2008-08-13
CHINESE TEXTILE ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lyocell also has some disadvantages in the production process: 1) The solvent NMMO contains nitrogen-oxygen bonds, which is easy to cause oxidative degradation of cellulose, and at the same time, the solvent is prone to explosion when the heating temperature exceeds 130°C; 2) It is difficult to recover the solvent, and with the shortage of oil, The price of raw materials has risen, and the current solvent price has risen a lot compared to when Lyocell started to be industrialized; 3) High vacuum dehydration is required during the dissolution process, which consumes a lot of energy; 4) High viscosity and high elasticity will appear during the dissolution process, and the production equipment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 110 grams of acetic acid 1-ethyl-3-methylimidazole liquid into 440 grams of N,N-dimethylacetamide, stir and dissolve to obtain a uniform mixed solvent; grind 48 grams of wood pulp and add it while stirring and kneading In the mixed solvent, after the feeding is completed, the temperature is gradually raised to 105°C under sealed stirring, during which the volatile impurities and air bubbles in the solution are removed under a vacuum of 0.9 bar, and a uniform and transparent solution is finally obtained with a concentration of 7% and a viscosity of 750Pa·S.

Embodiment 2

[0027] Add 554 grams of 1-butyl-3-methylimidazole chloride solid into 277 grams of N,N-dimethylacetamide, stir and dissolve at an appropriate temperature to obtain a uniform mixed solvent; pulverize 92 grams of wood pulp Add to the mixed solvent while stirring. After the addition is complete, gradually heat up to 125°C under sealed stirring, during which the volatile impurities and bubbles in the solution are removed under a vacuum of 1.0 bar, and finally a uniform and transparent solution is obtained. The concentration is 10 %, the viscosity is 950Pa·S.

Embodiment 3

[0029] Add 554 grams of 1-propyl-3-methylimidazole chloride light yellow liquid into 277 grams of N,N-dimethylacetamide, stir and dissolve to obtain a uniform mixed solvent; grind 95 grams of wood pulp and stir Add it into the mixed solvent. After the addition is complete, gradually heat up to 135°C under sealed stirring, during which the volatile impurities and bubbles in the solution are removed under a vacuum of 0.5 bar, and the organic solvent is removed by reducing pressure, and finally a uniform and transparent product is obtained. The solution has a concentration of 12% and a viscosity of 1150Pa·S.

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PUM

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Abstract

A cellulose solution containing components as follow: cellulose, which is 7.0%-30.0% of weight of cellulose solution, other components of are imidazolium ionic liquid which can dissolve cellulose and organic solvent mutual soluble with the imidazolium ionic liquid, with a weight ratio ranging from 1:9 to 24:1. The aforementioned cellulose solution is prepared by: mixing cellulose pulp with other components, preparing uniform cellulose solution by steps of heating, stirring, kneading, and vacuumizing. The cellulose solution prepared by aforementioned method can reduce hardness in process, relieving abrasion of apparatus, and the prepared solution is high in concentration, stable and hard to degrade. And cost can be reduced, suitable for industrialization.

Description

technical field [0001] The invention relates to a cellulose solution and a preparation method thereof. Background technique [0002] With the prominent problem of environmental pollution and the depletion of oil and other resources, the rational, effective and environmentally friendly utilization of natural resources has become the focus of attention. [0003] Cellulose is one of the most widely distributed and largest reserves of natural resources in nature, and its renewable and degradable properties meet the requirements of contemporary circular economy and green environmental protection. However, in the link from nature to human society, it is not very environmentally friendly and meets the requirements of today's green technology from the very beginning, especially the chemical reaction process and pollution in the production process of paper, viscose fiber and so on. concerns, these gave birth to the birth of solvents that directly dissolve cellulose. Lyocell is prep...

Claims

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Application Information

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IPC IPC(8): C08L1/00C08J3/09
CPCY02P20/54
Inventor 李晓俊孙玉山骆强陆伊伦徐成林相来朱庆松
Owner CHINESE TEXTILE ACAD
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