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Method for extracting cellulose in one step

A cellulose and reaction technology, used in fiber raw material processing, textiles and papermaking, etc., can solve the problems of high cost of ionic liquids, complex reaction conditions, poor environment, etc., and achieve the effects of low price, abundant sources and easy operation.

Inactive Publication Date: 2011-11-23
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This new method described for producing pure or highly purified cellulos from plants uses both chemical reactions and physical processes combined together. It achieves this through various techniques like filtrating, acidifying, degrading, dissolving, precipitating, centrifugal separation, etc., resulting in efficient processing times without harmful waste products. Additionally, there're no strong negative impact on environmentally sensitive areas where these methods may be applied due to their potential health hazards associated with them. Overall, this innovative technique offers technical benefits over existing technologies.

Problems solved by technology

This patent describes two technical problem addressed during researches related to how plants can effectively convert their vegetative material into useful substances such as fuels and other valuable compounds while also reducing harmful emissions associated with traditional processes like burning fossil sources.

Method used

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  • Method for extracting cellulose in one step
  • Method for extracting cellulose in one step
  • Method for extracting cellulose in one step

Examples

Experimental program
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Effect test

Embodiment 1

[0020] (1) First dry the corn stalks in the sun, then crush them mechanically, and collect the straw powder through a sieve (200 mesh) to obtain a light yellow solid powder.

[0021] (2) Add 2.0 g of crushed straw powder to the bottom of a 100 mL hydrothermal reactor, measure 40 mL of a mixed solution of ethanol and water with a volume ratio of 1:1, add it to the hydrothermal reactor, and stir to make the straw The rod powder is dispersed in the solution. Then add 4.4 g of sodium hydroxide solid into the hydrothermal reaction kettle, dissolve and then add 9 mL of 30% H 2 o 2 solution. Finally, in the reaction solution in the hydrothermal reactor, the concentration of sodium hydroxide is about 8 wt%, and the H 2 o 2 The concentration is about 5 wt%. Then seal the hydrothermal reactor, the control reaction pressure is 5 MPa, at 150 o C for 10 min. After the reaction was completed and the hydrothermal reactor was cooled, the product was poured out. The product was filtere...

Embodiment 2

[0024] (1) First dry the corn stalks in the sun, then crush them mechanically, and collect the straw powder through a sieve (200 mesh) to obtain a light yellow solid powder.

[0025] (2) Add 2.0 g of crushed straw powder to the bottom of a 100 mL hydrothermal reactor, measure 40 mL of a mixed solution of methanol and water with a volume ratio of 1:1, add it to the hydrothermal reactor, and stir to make the straw The rod powder is dispersed in the solution. Then add 0.5 g of potassium hydroxide solid to the hydrothermal reaction kettle, and then add 2.3 g of sodium chlorite after dissolving. Finally, in the reaction solution of the hydrothermal reactor, the concentration of potassium hydroxide was 1.1 wt%, and the concentration of sodium chlorite was about 5.0 wt%. Then seal the hydrothermal reactor, the control reaction pressure is 3 MPa, at 100 o C for 20 min. After the reaction was completed and the hydrothermal reactor was cooled, the product was poured out. The product...

Embodiment 3

[0028] (1) First dry the corn stalks in the sun, then crush them mechanically, and collect the straw powder through a sieve (200 mesh) to obtain a light yellow solid powder.

[0029] (2) Take 5.0 g of crushed straw powder and add it to the bottom of a 100 mL hydrothermal reactor, measure 60 mL of a mixture of acetone and methanol with a volume ratio of 1:1, add it to the hydrothermal reactor, and stir to make the straw The rod powder is dispersed in the solution. Then add 3.0 g of potassium hydroxide solid into the hydrothermal reaction kettle, dissolve and then add 2.5 mL of 30% H 2 o 2 . Finally, in the reaction solution of the hydrothermal reactor, the concentration of potassium hydroxide was 4.2 wt%, and the H 2 o 2The concentration is about 1.0 wt%. Then seal the hydrothermal reactor. Control the reaction pressure of the hydrothermal reactor to be 1 MPa, at 80 o C for 40 min. After the reaction was completed and the hydrothermal reactor was cooled, the product was...

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Abstract

The invention discloses a method for extracting cellulose in one step. The method comprises the following steps: dispersing dried and crushed plant straws in mixed solution of an organic solvent and water; adding inorganic base and an oxidizer to the mixed solution, and reacting in a closed hydrothermal reaction kettle at the pressure of 1-5MPa; and filtering, separating and washing with alcohol and water and then drying to finally obtain the cellulose. In the method, the organic solvent is preferably any one or more than one of acetone, ethanol, methanol and methylbenzene; the inorganic base is preferably potassium hydroxide and/or sodium hydroxide; and the oxidizer is preferably H<2>O<2> or sodium chlorite. By utilizing the method, non-cellulosic constituents such as hemicellulose, lignin, pectin and the like can be removed from the plant straws in one step so as to obtain the cellulose; and the production process is simple and easy for operation, thus being easy for popularization and industrialization.

Description

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Claims

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Application Information

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Owner ZHEJIANG SCI-TECH UNIV
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