Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for the preparation of micro- or NANO crystalline cellulose

A technology of nanocrystalline cellulose and crystalline cellulose, applied in food science and other directions, can solve problems such as chemical stability and poor mechanical properties

Active Publication Date: 2022-01-11
CELLICON BV
View PDF10 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This may result in poorer chemical stability and mechanical properties of the obtained product
[0016] The prior art dissolution process may also result in an irreversible transformation of the cellulose XRD type I crystal structure to the cellulose XRD type II crystal structure, considering the physical properties of the obtained cellulose products in certain applications such as high quality fibers , it is not advisable

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
  • Method for the preparation of micro- or NANO crystalline cellulose
  • Method for the preparation of micro- or NANO crystalline cellulose
  • Method for the preparation of micro- or NANO crystalline cellulose

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] Step 1: 60wt.% ZnCl in 100g 2 0.5 g of ZnO powder was added to the aqueous solution, and the mixture was stirred (120 rpm / min) at room temperature overnight to obtain the first solvent. Remaining unreacted ZnO solids were removed from solution by filtration. The resulting 100 g of solvent was mixed with 5 g of cotton linter cellulose under stirring at 480 rpm / min, and stirred at room temperature for 30 minutes. The resulting cellulose crystals were separated from the solution through a glass filter and washed 8 times with deionized water to remove ZnCl 2 . The product obtained was a 20 wt.% suspension of cellulose microcrystals in water.

[0074] Product samples were vacuum dried at room temperature before XRD measurements. XRD measurements showed that the % crystallinity of the XRD-I material was higher (>85%) compared to the original cellulose (80%).

[0075] The (poly)saccharide content was assessed by additional water washing of the XRD-I cellulosic material. ...

Embodiment 2

[0079] The procedure is the same as in Example 1, but step 1 and step 2 are carried out at a higher temperature (T=70° C.). The higher the temperature T, the shorter the treatment time. At 70 °C, the treatment time of both steps 1 and 2 was shortened to 15 minutes without significant change in the crystallinity of the obtained product. Likewise, at 70°C, step 1 produces type I cellulose and step 2 produces type II cellulose crystals.

Embodiment 3

[0081] The procedure was the same as in Example 1, but one of steps 1 or 2 was carried out at an elevated temperature of 70°C. The higher the temperature, the shorter the processing time. At 70°C, the treatment time was reduced to 15 minutes without appreciable change in the crystallinity of the resulting product.

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
melting pointaaaaaaaaaa
crystallinityaaaaaaaaaa
crystallinityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a method for the preparation of micro- or nano crystalline cellulosic compositions from virgin cellulose containing amorphous and crystalline cellulose phases comprising the following steps:(A) contacting virgin cellulose with a first solvent, characterized in that the first solvent is an aqueous solution comprising 40 - 65 wt.% ZnCl2 in water, relative to the total weight of the of ZnCl2 and water, (B) dissolving the amorphous cellulosic phase, whereby the amorphous cellulosic phase is preferentially dissolved over the crystalline cellulosic phase, (C) separating the dissolved amorphous cellulose from the crystalline cellulose and preferably step C wherein the obtained micro- or nanocellulose has XRD type I structure, which then can be contacted with a second solvent comprising between 65 and 90 wt.% ZnCl2 in water to produce delaminated cellulose having XRD type II structure. The invention also relates to micro- or nano crystalline cellulose having an XRD type I structure and nano crystalline cellulose having an XRD type II structure or mixtures thereof of high crystallinity and purity and the uses thereof.

Description

technical field [0001] The present invention relates to a method for preparing microcrystalline or nanocrystalline cellulose with high crystallinity. The invention also relates to microcrystalline or nanocrystalline cellulose with a high degree of crystallinity, mixtures thereof and uses thereof. Background technique [0002] Cellulose, the most abundant natural polymer in nature, is one of the most promising polymer resources that is renewable, biodegradable, and biocompatible. In general, however, chemical processing of cellulose is extremely difficult because of its partially crystalline structure and tight chain packing through numerous inter- and intra-molecular hydrogen bonds, making it insoluble in neither water nor common solvents. [0003] Over the past few decades, several cellulose solvent systems have been used to dissolve or react cellulose, such as viscose process (CS2), LiCl / N, N-dimethylacetamide (DMAc), DMSO / multiple Aqueous solutions of polyoxymethylene (...

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): C08B15/02C08B15/08
CPCC08B15/02C08B15/08A23L33/125A23V2002/00C08L1/04
Inventor P·奥康纳I·巴比奇J·J·L·海纳曼
Owner CELLICON BV