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: 2020-11-10
HUBEI UNIV OF TECH
View PDF11 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Cellulose solution and method of dissolving cellulose
  • Cellulose solution and method of dissolving cellulose
  • Cellulose solution and method of dissolving cellulose

Examples

Experimental program
Comparison scheme
Effect test

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 79.9 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 ) 1 g, add 30 g of 0° C. water, then add 69 g of 15° C. 2.5 M tetramethylammonium hydroxide aqueous solution, and stir for 0.5 minutes to obtain a transparent cellulose solution. The content of cellulose in the obtained cellulose solution was 1 wt%.

Embodiment 3

[0033] Weigh the dissolving pulp (viscosity-average molecular weight M η =8.0×10 4 ) 2 g, add 30 g of 5° C. water, then add 68 g of 20° C. 2.0 M tetraethylammonium hydroxide aqueous solution, and stir for 0.5 minutes to obtain a transparent cellulose solution. The content of cellulose in the obtained cellulose solution was 2 wt%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
degree of polymerizationaaaaaaaaaa
Login to view more

Abstract

The invention discloses a cellulose solution and a method for dissolving cellulose. The method includes: adding cellulose into an alkyl ammonium hydroxide aqueous solution with the temperature of 0-20DEG C and the concentration of 1.0-2.5 M, and performing stirring for 0.55 min to obtain a transparent cellulose solution, wherein the alkyl ammonium hydroxide is one or a mixture of more of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, benzyltrimethylammonium hydroxide and benzyltriethylammonium hydroxide. The method issuitable for natural cellulose with the molecular weight of 6.4 * 10 < 4 >-1.5 * 10 < 5 >, and is simple and convenient to operate, short in dissolving time and free of pollution to the environment; asolvent system is a single-component solvent, the prepared cellulose solution can be used for regenerating cellulose by taking a 0-0.5 M alkyl ammonium hydroxide aqueous solution as a coagulating bath, alkyl ammonium hydroxide in the waste liquid is easy to recover and recycle, and the method has a very wide application prospect.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08J3/09C08J5/18C08L1/02D01F2/00D01D1/02
CPCC08J3/03C08J3/096C08J5/18D01F2/00D01D1/02C08J2301/02
Inventor 冯清华胡愈诚谢益民
Owner HUBEI UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap