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Separating and analyzing method for high purity cellulose without pollution

A technology for separation and analysis of cellulose, applied in the field of separation and analysis of high-purity cellulose, can solve problems such as pollution, and achieve the effect of reducing pollution, white color and high purity

Inactive Publication Date: 2005-03-02
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a kind of separation and analysis method of pollution-free high-purity cellulose, it adopts completely chlorine-free and pollution-free technology to prepare high-purity cellulose, does not need to be bleached, helps to solve the pollution problem of papermaking industry, Moreover, the isolated high-purity cellulose is a potential raw material for many industrial productions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The first step: raw material preparation

[0022] The bagasse is cut into small pieces after being dried in the sun, ground, and the part that passes through the 4mm sieve is taken, and placed in an oven at 60°C to keep air circulation and dry for 15 hours;

[0023] Step 2: Separation of Cellulose

[0024] Take 1 kg of dried bagasse sample and put it into a reactor with a volume of 15 L, add 10 L of liquid acetic acid with a mass percentage concentration of 80%, and then add concentrated nitric acid. The quality of nitric acid is 1% of the acetic acid mass, and the reactor is placed In an oil bath, control the temperature at 100°C. After reacting for 22 minutes, take the reactor out of the oil bath, cool it, transfer the reaction product to a clean container with 10L distilled water, pour out the liquid gently, and wash the residue with distilled water Clean, then use 95% ethanol to remove residual nitric acid and extract to obtain a solid residue, dry the solid residu...

Embodiment 2

[0030] The first step: raw material preparation

[0031] The rice straw was dried and cut into small pieces, ground, and the part that passed through the 6mm sieve was taken, and placed in an oven at 40°C to keep air circulation and dry for 20 hours;

[0032] Step 2: Separation of Cellulose

[0033] Get dried rice straw sample 1kg and put it into a reactor with a volume of 15L, add 10L of liquid acetic acid with a mass percentage concentration of 80%, then add concentrated nitric acid, the quality of nitric acid is 6% of the acetic acid quality, and the reactor is placed In an oil bath, control the temperature at 110°C, react for 20 minutes, take the reactor out of the oil bath, cool, transfer the reaction product to a clean container with 10L distilled water, pour out the liquid gently, and wash the residue with distilled water Clean, then use 95% ethanol to remove residual nitric acid and extract to obtain a solid residue, dry the solid residue in an oven at 40°C for 20 hou...

Embodiment 3

[0039] The first step: raw material preparation

[0040] Dry the wheat straw and cut it into small pieces, grind it, take the part that passes through a 5mm sieve, and place it in an oven at 50°C to keep air circulation and dry for 18 hours;

[0041] Step 2: Separation of Cellulose

[0042] Get 1kg of dried wheat straw sample and put it into a reactor with a volume of 15L, add 10L of liquid acetic acid with a mass percentage concentration of 80%, and then add concentrated nitric acid. The quality of nitric acid is 8% of the acetic acid mass, and the reactor is placed In an oil bath, control the temperature at 120°C, react for 18 minutes, take the reactor out of the oil bath, cool, transfer the reaction product to a clean container with 10L distilled water, pour out the liquid gently, and wash the residue with distilled water Clean, then use 95% ethanol to remove residual nitric acid and extract to obtain a solid residue, dry the solid residue in an oven at 50°C for 18 hours t...

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PUM

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Abstract

The invention relates to a separation and analyzing method for high purity cellulose without contamination, it uses wood fiber as material; it decomposes the wood cellulose and semi-cellulose in system with acetic acid and nitric acid but without chlorine and contamination, acquires the cellulose with high purity. The invention uses acetic acid and nitric acid as catalyst, the weight percentage density of acetic acid is 80%, the weight of nitric acid is 1-8% of the acetic acid weight, they are processed for 18-22 minutes in 100-120deg.C, separates them and acquires the cellulose preparations; then carries on detection to the cellulose preparations with special viscosity, molecular weight, FT-IR, CP-MAS13C-NMR and energetics analysis. The process is simple and quick, has no contamination, the cellulose has a high purity, which can be applied to the separation and analysis of cellulose in wood fiber material.

Description

technical field [0001] The invention belongs to the technical field of cellulose separation and measurement, and in particular relates to a method for separation and analysis of pollution-free high-purity cellulose in lignocellulosic raw materials. Background technique [0002] As a huge green resource, cellulose has attracted more and more interest from scientists due to its renewable, biodegradable, biocompatible and derivatizable advantages. [0003] Separation of cellulose from lignocellulosic feedstock requires first removal of lignin and hemicellulose. In order to obtain cellulose pulp, the traditional pulping method uses sulfur-containing pulping chemicals to degrade most of the lignin and part of hemicellulose into small molecules and dissolve them in the liquid medium, but there are serious environmental pollution and the production of fibers The poor adaptability of plain pulp to TCF (total chlorine-free) bleaching and other issues. In ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/00G01N30/02G01N33/46G01N35/00
Inventor 许凤孙晓锋孙润仓刘传富
Owner SOUTH CHINA UNIV OF TECH
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