Method for preparing aerogel by quickly dissolving lignocellulose

A lignocellulose and aerogel technology, which is applied in the field of aerogel preparation, can solve the problems of slow dissolution speed and long preparation period, and achieve the effects of low cost, environmental protection and green cost, and wide source of raw materials.

Inactive Publication Date: 2013-06-12
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims to solve the problems of slow dissolving speed and long preparation period in the existing lignocellulose airge

Method used

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  • Method for preparing aerogel by quickly dissolving lignocellulose
  • Method for preparing aerogel by quickly dissolving lignocellulose
  • Method for preparing aerogel by quickly dissolving lignocellulose

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specific Embodiment approach 1

[0020] Embodiment 1: A method for rapidly dissolving lignocellulose to prepare airgel according to the present embodiment is specifically carried out in the following steps:

[0021] 1. Take the lignocellulosic raw material, wash and remove impurities, dry and pulverize, pass through a 40-200 mesh screen, then mix the lignocellulose raw material and the ionic liquid in a mass ratio of 0.1-20:100, and heat to After stirring at 150-200° C. for 5-20 minutes, a lignocellulose solution is obtained; 2. cooling the above solution; 3. adding a non-solvent to the lignocellulose solution cooled in step 2 to obtain a gel; 4. obtaining a gel in step 3 The lignocellulose aerogel is obtained after the gel is subjected to critical point drying, supercritical drying or freeze drying.

[0022] This embodiment has the following beneficial effects:

[0023] 1. The dissolving efficiency of the lignocellulose aerogel prepared by the existing method in the ionic liquid is low, at least 4 hours or ...

specific Embodiment approach 2

[0028] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the lignocellulosic raw material described in step 1 is a biomass raw material containing lignin, wherein the biomass raw material containing lignin includes wood waste, papermaking Residues, inedible parts of crops or resource crops. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the lignocellulose raw material and the ionic liquid described in step 1 are mixed in a mass ratio of 0.5-15:100. Others are the same as in the first or second embodiment.

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Abstract

The invention discloses a method for preparing aerogel by quickly dissolving lignocellulose, and relates to a method for preparing the aerogel. The problems that the existing lignocellulose is low in dissolution efficiency and cannot meet market demand are solved. The method comprises the following steps of: (1) using natural lignocellulose as a solute and using ion liquid as a solvent; (2) quickly dissolving lignocellulose to form a brown solution; (3) cooling the solution and pouring anti-solvent into the solution for precipitating and gelating the lignocellulose solution; (4) changing the anti-solvent for several times and totally replacing the ion liquid to form lignocellulose hydrogel; and (5) drying and processing the hydrogel to obtain an aerogel material. According to the method, the ion liquid can be recovered and recycled, and the prepared lignin aerogel has an excellent porous structure and has certain mechanical strength and is complete in form, so that the efficient utilization of low-quality wood resources is increased.

Description

technical field [0001] The invention relates to a method for preparing airgel. Background technique [0002] With the rapid disappearance of petroleum resources and environmental pollution caused by the consumption of petrochemical products, the world has begun to pay attention to renewable woody biomass resources as an alternative resource that can replace petrochemical resources. Lignocellulosic biomass resources include wood waste, papermaking residues, non-edible parts of crops, resource crops, etc. Lignocellulose is the most abundant biomass on earth and widely exists in woody and herbaceous plants. Its main components are macromolecules such as cellulose, hemicellulose, and lignin. The cellulose is wrapped by hemicellulose, and the outer layer is tightly embedded by lignin, which combine with each other to form a strong cell wall. Among them, cellulose is about 35-50%, hemicellulose is 20-35%, and lignin is about 5-30%. [0003] However, in the current concept of "b...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/11C08L97/02
Inventor 李坚卢芸孙庆丰刘一星
Owner NORTHEAST FORESTRY UNIVERSITY
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