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Method for preparing granular activated carbon from lignin

A technology of granular activated carbon and lignin, applied in chemical instruments and methods, non-metallic elements, inorganic chemistry, etc., can solve problems such as long carbonization time, and achieve the effect of reducing environmental protection costs and shortening the preparation process

Inactive Publication Date: 2014-08-06
JINAN SHENGQUAN GROUP SHARE HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of this invention is to propose a new method for preparing highly adsorbable activated carbon, to solve the defects of longer carbonization time in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] After the corn cob lignin and the aluminum dihydrogen phosphate solution with a mass fraction of 6% were mixed evenly at a weight ratio of 2.2:1, the mixture was placed in an oven and treated at 100°C for 1 hour, then pelletized, and then granulated at 150°C Dry and solidify for 3 hours, and finally put it into a microwave oven and irradiate it at 600W for 10 minutes. The amount of water vapor is 0.8 times that of the carbonized material. After cooling, wash with water until the pH value is 5-7, put the rinsed activated carbon into an oven and dry it at 150°C until it reaches a constant weight, so as to obtain high-strength granular activated carbon for gas phase adsorption. After testing: the iodine adsorption value reaches 1053mg / g, the methylene blue adsorption value reaches 225mg / g, and the butane working capacity is 12.5g / 100ml.

Embodiment 2

[0036]After the corn cob lignin is dried, it is mixed evenly with the aluminum dihydrogen phosphate solution with a mass fraction of 8% in a weight ratio of 1.5:1, and the mixture is placed in an oven for 3 hours at 100°C, and then shaped, Dry and solidify at 150°C for 3 hours, and finally put it into an activation furnace and irradiate it at 550W for 10 minutes. The amount of water vapor is 1.0 times that of the carbonized material. After cooling, wash with water until the pH value is 5-7, put the activated carbon after rinsing into an oven and bake at 150°C to constant weight. After testing: the iodine adsorption value reaches 720mg / g, the methylene blue adsorption value reaches 125mg / g, and the butane working capacity is 8.6g / 100ml.

Embodiment 3

[0038] After the corn cob lignin is dried, it is mixed evenly with the aluminum dihydrogen phosphate solution with a mass fraction of 8% in a weight ratio of 2.5:1, and the mixture is placed in an oven and treated at 100°C for 1 hour, and then molded. Dry and solidify at 150°C for 3 hours, and finally put it into an activation furnace and irradiate it at 650W for 15 minutes. The amount of water vapor is 1.5 times that of the carbonized material. After cooling, wash with water until the pH value is 5-7, put the activated carbon after rinsing into an oven and bake at 150°C to constant weight. After testing: the iodine adsorption value reaches 932mg / g, the methylene blue adsorption value reaches 218mg / g, and the butane working capacity is 11.2g / 100ml.

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Abstract

The invention provides a method for preparing granular activated carbon from lignin to solve a defect that the charring time in the prior art is long. The method is characterized in that lignin is used as a raw material to prepare granular activated carbon, an activation step is realized through microwave irradiation, and water steam is introduced during microwave activation. The method shortens the preparation flow of active flow. In an optimal method, aluminum dihydrogen phosphate is used as an activator, a large amount of washing water is not needed, and the environmental protection cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing activated carbon, in particular to a method for preparing granular activated carbon from lignin. Background technique [0002] Activated carbon is a kind of material with developed pore structure, huge specific surface area and strong adsorption capacity prepared from carbonaceous materials such as wood, fruit shell and coal. It is widely used in environmental protection, national defense, chemical industry, food, medicine, textile and other fields. Applications are increasingly widespread. In recent years, the shortage of coal and sawdust resources has become increasingly serious. Therefore, it is an important task for the development of my country's and the world's activated carbon industry to continuously develop raw materials for activated carbon production, explore new process conditions, and increase new varieties. Aiming at the shortage of wood resources as raw materials for traditional activated ...

Claims

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Application Information

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IPC IPC(8): C01B31/10C01B32/336
Inventor 唐一林江成真刘晓敏焦峰时锋
Owner JINAN SHENGQUAN GROUP SHARE HLDG
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