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Cellulose solution and method of dissolving cellulose

A cellulose solution and cellulose technology, applied in the field of cellulose, can solve the problems of long dissolution time, harsh conditions and high cost, and achieve the effects of short dissolution time, easy operation and convenient dissolution

Inactive Publication Date: 2020-09-29
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In order to overcome the disadvantages of various cellulose dissolving methods in the prior art, long dissolving time, high cost, pollution, and harsh conditions, the present invention provides a method for dissolving cellulose at a temperature above 0°C by using alkyl ammonium hydroxide. The method has a short time for dissolving cellulose, and the conditions are easy to control, safe for the environment, and the solvent is easy to recover and recycle

Method used

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  • Cellulose solution and method of dissolving cellulose
  • Cellulose solution and method of dissolving cellulose
  • Cellulose solution and method of dissolving cellulose

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Embodiment 1

[0029] Weigh the dissolving pulp (viscosity-average molecular weight M η =8.0×10 4 ) 0.1 g, add 20 g of water at 20° C., then add 79.8 g of 1.5 M benzyltriethylammonium hydroxide aqueous solution at 10° C., and stir for 0.5 minutes to obtain a transparent cellulose solution. The content of cellulose in the gained cellulose solution is 0.1wt%, as figure 1 Shown in a.

Embodiment 2

[0031] Weigh the dissolving pulp (viscosity-average molecular weight M η =8.0×10 4 ) 4 grams, add 30 grams of water at 0°C, then add 66 grams of 15°C 2.0M benzyltrimethylammonium hydroxide / benzyltriethylammonium hydroxide aqueous solution, and stir for 5 minutes to obtain a transparent cellulose solution . The content of cellulose in the obtained cellulose solution was 4 wt%.

Embodiment 3

[0033] Weigh the dissolving pulp (viscosity-average molecular weight M η =8.0×10 4 ) 0.1 g, was added into 99.8 g of 20° C. 0.5 M benzyltriethylammonium hydroxide aqueous solution, because the concentration of benzyltriethylammonium hydroxide was too low, stirring for 5 minutes did not completely dissolve the cellulose.

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Abstract

The invention discloses a cellulose solution and a method for dissolving cellulose. The method comprises the following steps: adding cellulose into an aqueous alkyl ammonium hydroxide solution with atemperature of 0-20 DEG C and a concentration of 1.0-2.5 M, and carrying out stirring for 0.5-5 minutes to obtain a transparent cellulose solution, wherein alkyl ammonium hydroxide is one or a mixtureof benzyltrimethylammonium hydroxide and benzyltriethylammonium hydroxide. The method is applicable to natural cellulose with a molecular weight of 6.4 * 10<4> to 1.5 * 10<5>, and is simple and convenient to operate, short in dissolving time and free of pollution to the environment; a solvent system is a single-component solvent, and the prepared cellulose solution can be used for regenerating cellulose by taking the aqueous alkyl ammonium hydroxide solution with a concentration of 0-0.5 M as a coagulating bath; and alkyl ammonium hydroxide in waste liquid is easy to recover and recycle, andthe method has wide application prospects.

Description

technical field [0001] The invention relates to a cellulose solution and a method for dissolving cellulose, belonging to the technical field of cellulose. Background technique [0002] The sustainable development of making full use of renewable resources and resources has become an important direction of scientific and technological research and development. Cellulose is the most abundant renewable resource in the world. Making full use of cellulose can not only protect the environment, but also save limited petroleum resources. However, due to the complex intermolecular and intramolecular hydrogen bond structure and high crystallinity of cellulose, cellulose cannot be melted and is difficult to dissolve, which makes cellulose far from being fully utilized in industry. At present, the large-scale application in the industrial field is still the viscose method, because there is environmental pollution in the viscose process, and other organic or inorganic solvents, such as d...

Claims

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Application Information

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IPC IPC(8): C08J3/03C08J3/09C08J5/18C08L1/02D01F2/00D01D1/02
CPCC08J3/03C08J3/096C08J5/18C08J2301/02D01D1/02D01F2/00
Inventor 冯清华胡愈诚谢益民
Owner HUBEI UNIV OF TECH
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