Carbon dioxide composite solvent and method for dissolving cellulose

A technology for dissolving cellulose and carbon dioxide, applied in the field of chemistry and materials, to achieve the effect of improving concentration and stability, low temperature and pressure requirements, and improving solubility

Pending Publication Date: 2021-12-07
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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However, the shortcomings of these two methods are also obvious

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  • Carbon dioxide composite solvent and method for dissolving cellulose

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Embodiment 1

[0024] A carbon dioxide complex solvent, including 10.00g DMSO, 1.91g DBU and 1.00g propylene carbonate (PC), CO 2 Henry's constant in PC is 0.68×10 7 Pa. Dissolve 0.68g of pulp cellulose (DP=755) in the carbon dioxide composite solvent, pass through 0.5MPa carbon dioxide, and activate and dissolve at 50°C to obtain a cellulose solution with a cellulose concentration of 5wt%. In this solution, DBU and fiber The molar ratio of prime anhydroglucose unit AGU is 3:1.

Embodiment 2

[0026] A carbon dioxide complex solvent, including 10.00g DMSO, 2.55g DBN and 2.00g propylene carbonate (PC), CO 2 Henry's constant in PC is 0.68×10 7 Pa. Dissolve 1.10g of pulp cellulose (DP=755) in the carbon dioxide composite solvent, pass through 0.3MPa carbon dioxide, and activate and dissolve at 40°C to obtain a cellulose solution with a cellulose concentration of 7wt%. In this solution, DBN and AGU The molar ratio is 3:1.

Embodiment 3

[0028] Dissolve pulp cellulose (DP=755) (2.10g) in a carbon dioxide composite solvent of DMSO (10.00g), DBU (5.92g) and SF (3.00g), and CO 2 The Henry constant in SF is 0.86×10 7 Pa. Then, 0.6MPa carbon dioxide was introduced to activate dissolution at 60° C. to obtain a cellulose solution with a cellulose concentration of 10 wt %, and the molar ratio of DBU to AGU in the solution was 3:1.

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Abstract

The invention discloses a carbon dioxide composite solvent and a method for dissolving cellulose by using the same. The composite solvent comprises an organic solvent, organic alkali and a carbon dioxide absorbent, and the Henry constant of carbon dioxide in the carbon dioxide absorbent at normal temperature is less than 1.0*10<7> Pa or the solubility parameter of the carbon dioxide absorbent is less than 4.0*10<6> Pa (1/2). The method for dissolving cellulose comprises the steps: dissolving cellulose in a carbon dioxide composite solvent to form a solid-liquid mixture, then introducing carbon dioxide, stirring and dissolving to obtain a cellulose solution. A polar aprotic solvent with low Henry constant is used as the efficient carbon dioxide absorbent, and is combined with the organic alkali and the organic solvent of a carbon dioxide dissolving system to prepare the carbon dioxide composite solvent, so that the dissolving capacity on cellulose can be improved, and a high-concentration cellulose solution is obtained; and the consumption of carbon dioxide can be effectively reduced and the stability of the cellulose solution is improved.

Description

technical field [0001] The invention belongs to the technical field of chemistry and materials, and in particular relates to a carbon dioxide composite solvent and a method for dissolving cellulose with it. Background technique [0002] Cellulose is the most abundant natural polymer on earth and one of the most important renewable raw materials. At present, it has been widely used in papermaking, packaging, food and medical fields. However, due to the rigidity of cellulose molecules and a large number of intramolecular and intermolecular hydrogen bonds, cellulose has a stubborn structure with high rigidity and high crystallinity, which cannot be melted and is extremely difficult to dissolve. This severely limits its processing and application. Therefore, the development of a solvent system that can efficiently dissolve cellulose under mild conditions has been a research focus for a long time. [0003] At present, the systems that can be used for cellulose dissolution have...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/09C08L1/02C08L1/04
CPCC08J3/095C08J3/096C08J3/097C08J2301/02C08J2301/04
Inventor 张金洋刘斐那海宁朱锦
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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