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A method for extracting lignin from bamboo shoot shells

A technology of lignin and bamboo shoot shells, applied in the field of bamboo shoot processing, to achieve the effects of rapid extraction, increased extraction rate, and simple operation

Active Publication Date: 2021-04-06
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing technology lacks a simple, fast and efficient method for extracting high-purity lignin from discarded bamboo shoot shells

Method used

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  • A method for extracting lignin from bamboo shoot shells
  • A method for extracting lignin from bamboo shoot shells

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Experimental program
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Effect test

Embodiment 1

[0034] A method for extracting lignin from bamboo shoot shells, characterized in that it comprises the following steps:

[0035] 1) Collect the bamboo shoot shells of the bamboo shoots produced in Fenghua District, Ningbo City, Zhejiang Province, crush the bamboo shoot shells to a particle size of 50 mesh particles, and use a mixed solvent of benzene: ethanol volume ratio of 2: 1 in a Soxhlet extractor at 110 Extract the raw material for 4 hours at ℃, filter under reduced pressure, and dry the filter residue in an oven at 40℃ for 12 hours to obtain a pretreated sample;

[0036] 2) Take the pretreated sample and put it into the acetic acid solution, add 3% concentrated HCl as a catalyst, place it in an ultrasonic-ultraviolet light reactor, set the ultrasonic power to 200W, and the wavelength of ultraviolet light to 365nm, and react at 80°C for 60min; The volume fraction is 80%, and the mass ratio of pretreatment sample and acetic acid solution is 1: 30;

[0037] 3) The reacted...

Embodiment 2

[0040]A method for extracting lignin from bamboo shoot shells, characterized in that it comprises the following steps:

[0041] 1) Collect the bamboo shoot shells of the bamboo shoots produced in Fenghua District, Ningbo City, Zhejiang Province, and crush the bamboo shoot shells to particles with a particle size of 80 meshes. Extract the raw material for 6 hours at ℃, filter under reduced pressure, and dry the filter residue in an oven at 30℃ for 12 hours to obtain a pretreated sample;

[0042] 2) Put the pretreated sample into the acetic acid solution, add 8% concentrated HCl as a catalyst, place it in an ultrasonic-ultraviolet light reactor, set the ultrasonic power to 800W, and the ultraviolet light wavelength to 350nm, and react at 90°C for 20min; The volume fraction is 90%, and the mass ratio of the pretreated sample to the acetic acid solution is 1:10;

[0043] 3) The reacted sample is filtered under reduced pressure, and the filtrate is placed in a rotary evaporator to...

Embodiment 3

[0046] A method for extracting lignin from bamboo shoot shells, characterized in that it comprises the following steps:

[0047] 1) Collect the bamboo shoot shells of wild bamboo shoots produced in Fenghua District, Ningbo City, Zhejiang Province, crush the bamboo shoot shells to particles with a particle size of 60 mesh, and use a mixed solvent with a volume ratio of benzene:ethanol of 2.5:1 in a Soxhlet extractor at 115 Extract the raw material for 5 hours at ℃, filter under reduced pressure, and dry the filter residue in an oven at 40℃ for 10 hours to obtain a pretreated sample;

[0048] 2) Take the pretreated sample and put it into the acetic acid solution, add 5% concentrated HCl as a catalyst, place it in an ultrasonic-ultraviolet light reactor, set the ultrasonic power to 400W, and the ultraviolet light wavelength is 360nm, and react at 90°C for 50min; the acetic acid in the acetic acid solution The volume fraction is 80%, and the mass ratio of pretreatment sample and a...

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Abstract

The application of the present invention discloses a method for extracting lignin from bamboo shoot shells, which comprises the following steps: 1) pulverizing the bamboo shoot shells, filtering after leaching, and drying the filter residue to obtain a pretreated sample; 2) taking the pretreated sample and putting it into acetic acid In the solution, concentrated HCl is used as a catalyst, and the reaction is carried out under the conditions of providing ultrasonic waves and ultraviolet radiation at the same time; 3) filtering the reacted sample, concentrating the filtrate to obtain a concentrated solution; 4) adding water to the concentrated solution, standing, Centrifuged, then washed with concentrated acid solution, and dried. The above method can simply, quickly and efficiently extract high-purity lignin from discarded bamboo shoot shells.

Description

technical field [0001] The invention belongs to the technical field of bamboo shoot processing, and in particular relates to a method for extracting lignin from bamboo shoot shells. Background technique [0002] Bamboo shoot shells, referred to as bamboo shoot shells, are the shells that fall off after bamboo shoots become bamboo or the by-products of bamboo shoots after processing. Because they are inedible and cannot be directly used, they are discarded as agricultural and forestry waste. my country is rich in bamboo shoot resources, and the bamboo shoot industry has achieved rapid development in recent years, but the bamboo shoots are very seasonal, so every year when the bamboo shoots are on the market, the bamboo shoot shells will pile up like a mountain, which is difficult to remove, which will affect the ecological environment of the bamboo shoot production areas. create pollution. In order to reduce the pollution caused by bamboo shoot shells, relevant personnel have...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H7/00
CPCC08H6/00
Inventor 王亚娟仇丹李亚刘娣泮家浩徐财坤邵双喜邱纪时
Owner NINGBO UNIVERSITY OF TECHNOLOGY