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Method for preparing aerogel by using waste peanut shells

A peanut shell and aerogel technology, which is applied in the field of biomass aerogel preparation, can solve the problems of environmental pollution, solvent toxicity and volatility, etc., and achieve the effect of simple process, low dissolution temperature and strong solubility

Inactive Publication Date: 2015-11-11
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method for preparing biomass aerogel is LiCl / DMSO solvent method, but the solvent used in this method has certain toxicity and volatility, and is a non-green and environmentally friendly solvent. The preparation process of biomass aerogel is easy to cause environmental pollution.

Method used

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  • Method for preparing aerogel by using waste peanut shells

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of method utilizing waste peanut shell to prepare airgel, comprises the following steps:

[0019] (1) Take peanut shells and dry them at a temperature of 50-100°C, then crush them through a 180-mesh sieve to obtain peanut shell powder for later use;

[0020] (2) Dissolve the peanut shell powder in step (1) in a mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone to obtain a peanut shell solution (concentration of peanut shell is 1 -4%);

[0021] Wherein, the content of 1-ethyl-3-methylimidazole acetate in the mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone is 10-70%;

[0022] Wherein, the dissolution temperature of the peanut shell powder dissolved in the mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone is controlled at 25-100°C;

[0023] (3) Transfer the peanut shell solution to the mold, freeze at -20°C to -100°C for 12-48 hours, then add water to the frozen peanut shell gel to was...

Embodiment 2

[0026] A kind of method utilizing waste peanut shell to prepare airgel, comprises the following steps:

[0027] (1) Take peanut shells and dry them at a temperature of 50-100°C, then crush them through a 180-mesh sieve to obtain peanut shell powder for later use;

[0028] (2) Dissolve the peanut shell powder in step (1) in a mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone to obtain a peanut shell solution (concentration of peanut shell is 1 -4%);

[0029] Wherein, the content of 1-ethyl-3-methylimidazole acetate in the mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone is 10-70%;

[0030] Wherein, the dissolution temperature of the peanut shell powder dissolved in the mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone is controlled at 25-100°C;

[0031] (3) Transfer the peanut shell solution to the mold, freeze at -20°C to -100°C for 12-48 hours, then add water to the frozen peanut shell gel to was...

Embodiment 3

[0034] A kind of method utilizing waste peanut shell to prepare airgel, comprises the following steps:

[0035] (1) Take peanut shells and dry them at a temperature of 50-100°C, then crush them through a 180-mesh sieve to obtain peanut shell powder for later use;

[0036] (2) Dissolve the peanut shell powder in step (1) in a mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone to obtain a peanut shell solution (concentration of peanut shell is 1 -4%);

[0037] Wherein, the content of 1-ethyl-3-methylimidazole acetate in the mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone is 10-70%;

[0038] Wherein, the dissolution temperature of the peanut shell powder dissolved in the mixed solution of 1-ethyl-3-methylimidazole acetate and N-methylpyrrolidone is controlled at 25-100°C;

[0039] (3) Transfer the peanut shell solution to the mold, freeze at -20°C to -100°C for 12-48 hours, then add water to the frozen peanut shell gel to was...

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Abstract

The invention relates to a method for preparing aerogel by using waste peanut shells. The method comprises the following steps: (1) drying and crashing peanut shells to obtain peanut shell powder; (2) dissolving the peanut shell powder in a mixed solution of 1-ethyl-3-methylimidazole acetate and N-methyl pyrrolidone to obtain a peanut shell solution; (3) transferring the peanut shell solution into a mold, freezing at the temperature of -20 DEG C to -100 DEG C for 12-48h to obtain peanut shell hydrogel; and (4) freezing the peanut shell hydrogel obtained in the step (3) at the temperature of -10 DEG C to -60 DEG C for 6-24h and then transferring to a freeze-dryer for freeze drying, thus obtaining the aerogel. Since peanut shell which is crop waste is used as a raw material for preparation of biogas aerogel, the method has the advantages that waste recycling is realized, remarkable economic and social benefits are obtained, the process steps are simple without use of anticorrosive equipment, the preparation cost and the investment cost are relatively low, the practicability is relatively high, and therefore the industrial popularization can be facilitated.

Description

technical field [0001] The invention relates to the technical field of biomass airgel preparation, in particular to a method for preparing airgel by utilizing waste peanut shells. Background technique [0002] China is the largest producer of peanuts in the world, with an annual output of more than 14.5 million tons, accounting for 42% of the world's total output, and an annual production of about 4.5 million tons of peanut shells. At present, except for a small portion of peanut shells being used as feed, most of them are thrown away and burned, resulting in a great waste of resources and environmental pollution. Peanut shells are mainly composed of cellulose, lignin and hemicellulose, of which the content of cellulose can reach about 45%, and the content of lignin is about 32%. , Turning waste into treasure, etc. has important and positive significance. [0003] Airgel is a porous material with low density, high porosity, large specific surface area, and small pore size....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L97/00C08L1/02C08L5/14
Inventor 许爱荣卢伟伟吴峰敏魏学锋
Owner HENAN UNIV OF SCI & TECH