Method for ultrasonically catalyzing and extracting hemicellulose, cellulose and lignin from plant straws

A technology of hemicellulose and lignin, applied in chemical instruments and methods, lignin derivatives, fiber raw material processing and other directions, can solve the problems of harsh reaction extraction conditions, unsuitable for industrialized promotion and production, environmental pollution of organic solvents, etc. Facilitate industrial-scale production, reduce costs and energy consumption, and reduce environmental pollution

Inactive Publication Date: 2010-08-04
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods generally require high temperature and high pressure, harsh reaction and extraction conditions, and the use of organic solvents is also likely to cause environmental pollution, which is not suitable for industrial promotion and production.

Method used

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  • Method for ultrasonically catalyzing and extracting hemicellulose, cellulose and lignin from plant straws
  • Method for ultrasonically catalyzing and extracting hemicellulose, cellulose and lignin from plant straws

Examples

Experimental program
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Effect test

Embodiment 1

[0037] (1) First dry the corn stalks in the sun, then mechanically pulverize the corn stalks, collect the corn stalk powder through a 200-mesh sieve, and fully dry the collected corn stalk powders to remove moisture.

[0038] (2) Weigh 0.50 g of the collected dry corn stalk powder and disperse it in 40 mL of aqueous solution with pH=4 adjusted by 1 M HCl for ultrasonic treatment, and control the ultrasonic temperature at 30° C., and the ultrasonic time for 40 minutes, The ultrasonic power is 200 watts, the ultrasonic frequency is 20KHz, the hemicellulose in the corn stalk is dissolved in the aqueous solution, the hemicellulose aqueous solution is collected by separation, and the hemicellulose aqueous solution is freeze-dried to obtain 0.08 g of hemicellulose solid.

[0039] (3) the stalk residue obtained by the separation of the previous step is used with 10mg nano-Fe 3 o 4 @TiO 2 (wherein, nano-Fe 3 o 4 is the nucleus, the nano-Fe 3 o 4 The particle size is 20nm; TiO 2...

Embodiment 2

[0043] (1) After the wheat straw is dried in the sun, the wheat straw is mechanically pulverized, and the wheat straw powder is collected through a 200-mesh sieve, and the collected wheat straw powder is fully dried to remove moisture.

[0044] (2) Weigh 0.50 g of the collected dry wheat straw powder and disperse it in a certain 40 mL of water with pH=7 for ultrasonic treatment, and control the ultrasonic temperature at 40° C., ultrasonic time for 30 minutes, ultrasonic power of 200 watts, and ultrasonic frequency of 20 KHz. The hemicellulose in the wheat straw is dissolved in the aqueous solution, and the hemicellulose aqueous solution is collected by separation, and the hemicellulose aqueous solution is rotary evaporated to remove water, and then vacuum-dried to 0.06 g of hemicellulose solid.

[0045] (3) the stalk residue obtained by the separation of the previous step is used with 10mg nano-Fe 3 o 4 @TiO 2 (wherein, nano-Fe 3 o 4 is the nucleus, the nano-Fe 3 o 4 The...

Embodiment 3

[0049] (1) The rape straw is first dried in the sun, then the rape straw is mechanically pulverized, and the rape straw powder is collected through a 400-mesh sieve, and the collected rape straw powder is fully dried to remove water.

[0050] (2) Weigh 0.50 g of the collected dry rape stalk powder and disperse it in a certain 40 mL aqueous solution with a concentration of 1 M NaOH to adjust pH=10 for ultrasonic treatment, and control the ultrasonic temperature at 50 ° C, ultrasonic time for 20 minutes, ultrasonic With a power of 400 watts and an ultrasonic frequency of 25KHz, the hemicellulose in the rape straw is dissolved in the aqueous solution, the hemicellulose aqueous solution is collected by separation, and the hemicellulose aqueous solution is freeze-dried to obtain 0.11 g of hemicellulose solid.

[0051] (3) the stalk residue obtained by the separation of the previous step is used with 10mg nano-Fe 3 o 4 @TiO 2 (wherein, nano-Fe 3 o 4 is the nucleus, the nano-Fe ...

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Abstract

The invention discloses a method for ultrasonically catalyzing and extracting hemicellulose, cellulose and lignin from plant straws. The method comprises the following steps of: (1) airing plant straws and then mechanically crushing, collecting plant straw powder, fully drying and removing moisture; (2) dispersing the dried plant straw powder into a water solution and then carrying out ultrasonic treatment, dissolving the hemicellulose into the water solution, then separating the water solution, and carrying out photocatalytic decomposition on the separated plant straw residuals by taking nano Fe3O4-TiO2 as a photocatalyst with a core-shell structure; (3) separating and extracting lignin from the residuals subjected to the photocatalytic decomposition by using an organic solvent in an extraction way, wherein the extracted residuals are a mixture of the cellulose and the photocatalyst; and (4) putting the extracted residuals under a magnetic field to separate the cellulose from the photocatalyst to obtain the cellulose. The invention successfully realizes the separation and the full utilization of the hemicellulose, the cellulose and the lignin in the plant straws and improves the utilization ratio of renewable resources.

Description

Technical field: [0001] The invention relates to a method for ultrasonically catalyzing and extracting hemicellulose, cellulose and lignin from plant straws. The invention belongs to a pretreatment method of organic chemical plant stalks. Background technique [0002] It is becoming increasingly apparent that we face an unprecedented challenge to meet growing energy demands and protect the environment. Naturally attracting attention as the planet's premier and yearly renewable plant fiber resource. Plant fiber resources mainly include crop straw and forestry waste. The amount of straw raw materials produced in my country every year is huge, and it is estimated that there are as many as one billion tons. Most of these resources are not used efficiently, and converting plant fibers into industrial products represents a sustainable way to meet the growing demand for fuel and chemical products, especially in view of the limited supply of mineral resources, and the dwindling oi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/14C07G1/00D21C5/00
Inventor 江国华许陈莹王寅孙心克
Owner ZHEJIANG SCI-TECH UNIV
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