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A method for preparing high-purity nanocellulose from fiber plants

A nanocellulose, high-purity technology, applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of using toxic and harmful chemicals, unfriendly environment, etc., and achieve the effect of improving purity and whiteness

Active Publication Date: 2018-02-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing high-purity nanocellulose from fiber plants in view of the problems of unfriendly environment and the use of toxic and harmful chemicals in the existing nanocellulose preparation process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Weigh 1 kg of 20 mesh corn stalks, add 3 kg of sulfuric acid aqueous solution with a pH of 3.5, treat at 160°C for 1 hour, dissolve pentosan, and then wash and squeeze to obtain pretreated corn stalk A; : Magnesium oxide: Water = 100: 3: 40, add pretreated corn stalk A, magnesium oxide, and water into the reactor, and feed 1MPa oxygen, react at 170°C for 1 hour, and then wash and squeeze to obtain crude fiber B; press In terms of mass ratio, crude fiber B: 30% hydrogen peroxide: water = 100: 5: 100, add crude fiber B, hydrogen peroxide and water into the reactor, react at 120°C for 2 hours, then wash and squeeze, dilute and homogenize, and homogenize under high pressure and spray drying to obtain a high-purity nanocellulose product with a particle size distribution of less than 200nm and a fiber content greater than 97%.

Embodiment 2

[0017] Weigh 1 kg of 20-mesh bamboo powder, add 5 kg of aqueous sulfuric acid solution with a pH of 4.5, treat at 180° C. for 1 h, dissolve pentosan, and then wash and squeeze to obtain pretreated bamboo powder A; in terms of mass ratio, pretreated bamboo powder A : Magnesium oxide: Water = 100: 4: 80, add pretreated bamboo powder A, magnesium oxide, and water into the reactor, and feed 2MPa oxygen, react at 155°C for 2.5h, and then wash and squeeze to obtain crude fiber B; According to the mass ratio, crude fiber B: 30% hydrogen peroxide: water = 100: 10: 200, add crude fiber B, hydrogen peroxide, and water into the reactor, react at 100°C for 4 hours, and then wash and squeeze, dilute and homogenize, and homogenize under high pressure. quality and spray drying to obtain a high-purity nanocellulose product with a particle size distribution of less than 200nm and a fiber content greater than 97%.

Embodiment 3

[0019] Weigh 1 kg of rice husk, add 5 kg of sulfuric acid aqueous solution with a pH of 4, treat at 180 ° C for 1 h, dissolve pentosan, and then wash and squeeze to obtain pretreated bamboo powder A; in terms of mass ratio, pretreated bamboo powder A: oxidized Magnesium: water = 100: 4: 60, add pretreated bamboo powder A, magnesium oxide, and water into the reactor, and feed 2MPa oxygen, react at 160°C for 2 hours, and then wash and squeeze to obtain crude fiber B; according to the mass ratio Calculate, crude fiber B: 30% hydrogen peroxide: water = 100: 10: 200, add crude fiber B, hydrogen peroxide, and water into the reactor, react at 120°C for 3 hours, and then wash and squeeze, dilute and homogenize, high-pressure homogenize and spray Dry to obtain a high-purity nanocellulose product with a particle size distribution of less than 200nm and a fiber content greater than 97%.

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Abstract

The invention relates to a method for preparing high-purity nano-crystalline cellulose from textile plants and relates to the utilization of textile plants. The method comprises the following steps: 1), after being crushed and screened for purification, textile plants are added into a sulfuric acid aqueous solution for treatment, so as to dissolve out glycan, and then through washing and squeezing, a preprocessed fibrous material A is obtained; 2), the fibrous material A obtained in the step 1), magnesium oxide and water are added into a reaction kettle, oxygen is introduced, then washing and squeezing are performed after reaction, and a crude fibre B is obtained; and 3), the crude fibre B obtained in the step 2), hydrogen peroxide and water are added into a reaction kettle for reaction, after reaction, the high-purity nano-crystalline cellulose can be obtained through washing, squeezing, diluted homogenizing, high-pressure homogenizing and drying. Hemicelluloses and lignin in the textile plants are effectively removed; further the purity and the whiteness of the cellulose are further improved; not only is an environmental physical method adopted for preparing nano-crystalline cellulose, but also high purity cellulose can be made from the textile plants in a sulfur-free and chloride-free way, and the method can be well applied to the fields of foods, medicines and the like.

Description

technical field [0001] The invention relates to the utilization of fiber plants, in particular to a method for preparing high-purity nanometer cellulose from fiber plants. Background technique [0002] Cellulose is the oldest, most abundant and sustainable natural polymer on earth, and various technologies have been developed around the utilization of cellulose. In recent years, nanocellulose has attracted extensive research interest due to its special nanostructure and properties. Considering the huge application prospects of nanocellulose in food, medicine and other life and health fields, while developing its application fields, we must also pay attention to whether the source of nanocellulose and the preparation process are green and healthy. However, most of the current preparation methods are unfriendly to the environment and use toxic and harmful chemicals, which limits the application of nanocellulose in the fields of life and health. It is urgent to develop a green...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00
CPCD21C5/00
Inventor 林鹿蒋叶涛王鹤翀曾宪海孙勇唐兴
Owner XIAMEN UNIV
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