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Method for preparing granular active carbon by using biomass

A technology for granular activated carbon and biomass, which is applied in the fields of biofuels, separation methods, chemical instruments and methods, etc., can solve the problems of poor activation effect of granular activated carbon, high cost, large economic cost, etc., and achieve considerable economic prospects and ecological benefits. , enhance the compressive strength, reduce the effect of use

Inactive Publication Date: 2019-08-30
FUDAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both methods have certain disadvantages, the former needs to add binder and the economic cost of subsequent processing is relatively large
The latter directly uses granular biomass for deactivation. During the process of soaking with activator, the activator cannot fully contact the raw material, resulting in poor activation effect of granular activated carbon, and the strength of granular activated carbon obtained by this method is weak.
Nowadays, the preparation technology of activated carbon is quite mature, but its cost is the most important factor affecting industrial production. For example, the main raw material for industrial preparation is coal. Coal is a non-renewable energy source with high cost.
Expensive to use binders in the activation process

Method used

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  • Method for preparing granular active carbon by using biomass
  • Method for preparing granular active carbon by using biomass
  • Method for preparing granular active carbon by using biomass

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A method for preparing granular activated carbon from sawdust or corn stalks. Specific steps are as follows:

[0027] (1) Dry wood chips or corn stalks and crush them into wood chips or corn stalk powder;

[0028] (2) Add 150g of sawdust or corn stalk powder obtained in step (1) into the hydrothermal reaction kettle, and at the same time add 900mL of deionized water to obtain a mixture of sawdust or corn stalk;

[0029] (3) Heat the mixture of wood chips or corn stalks in step (2) to 180°C, keep the reaction for 0.5 hours, and the speed of mechanical stirring is 150 r / min;

[0030] (4) After the reaction, cool and filter to obtain solid-phase hydrothermal charcoal, and put the solid-phase hydrothermal charcoal in an oven to dry at 80°C;

[0031] (5) Weigh 10g of the dried solid-phase hydrothermal charcoal obtained in step (4), add activator (zinc chloride 20g, ferric chloride concentration 12.97g) and 100mL deionized water, soak for 24 hours, and then carry out Filte...

Embodiment 2

[0036] A method for preparing granular activated carbon from sawdust. Specific steps are as follows:

[0037] (1) Dry the sawdust and crush it into sawdust powder;

[0038] (2) Add 150g of sawdust powder obtained in step (1) into a hydrothermal reaction kettle, and add 900mL of deionized water at the same time to obtain a sawdust mixture;

[0039] (3) Heat the sawdust mixture in step (2) to 170°C, 200°C, 230°C, 260°C, and 290°C respectively, keep the reaction for 0.5 hours, and mechanically stir at a speed of 150 r / min;

[0040] (4) After the reaction, cool and filter to obtain solid-phase hydrothermal charcoal, and put the solid-phase hydrothermal charcoal in an oven to dry at 80°C;

[0041] (5) Weigh 10g of the dried solid-phase hydrothermal charcoal obtained in step (4), add activator (zinc chloride 20g, ferric chloride concentration 12.97g) and 100mL deionized water, soak for 24 hours, and then carry out Filter and dry in an oven at 80°C to obtain hydrothermal charcoal ...

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Abstract

The invention relates to a method for preparing granular active carbon by using biomass, wherein the granular active carbon is prepared by using biomass as a raw material through hydrothermal carbonization, molding and activation, the biomass comprises corn straw, wheat straw, soybean straw, cotton straw, tobacco straw, rice straw, sawdust, Salix psammophila, water hyacinth or pine branch biomass,and the activator can be zinc chloride, sulfuric acid, phosphoric acid, potassium carbonate, potassium hydroxide and ferric chloride. According to the present invention, corn straw and sawdust are used as the raw materials, and can generate the hydrothermal carbon with strong bonding effect and the hydrothermal liquid with high added value through hydrothermal carbonization, the hydrothermal carbon has a certain bonding effect, and the specific surface area and the pore volume of large-particle active carbon are increased with zinc chloride and ferric chloride, such that the granular active carbon integrating good compressive strength and high adsorption performance is obtained so as to improve the application value.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, in particular to a method for preparing granular activated carbon from biomass. The present invention uses biomass as a raw material to prepare granular activated carbon, and specifically involves carbonizing lignin, cellulose and hemicellulose components in biomass through hydrothermal carbonization technology to obtain solid-phase hydrothermal carbon. Hydrothermal carbon is extruded to obtain granular hydrothermal carbon, and then activated to obtain granular activated carbon with high specific surface area and mechanical strength. The activation process uses zinc chloride and ferric chloride as activators. The process can obtain granular activated carbon with certain mechanical strength and adsorption performance without binder, reducing economic cost. Moreover, the present invention uses biomass as a raw material, is environmentally friendly, and provides a novel and su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/342C01B32/348B01J20/20B01J20/30C10B53/02C02F1/28B01D53/02
CPCC01B32/324C01B32/342C01B32/348B01J20/20C10B53/02C02F1/283B01D53/02B01J2220/4843Y02E50/10
Inventor 张士成余锋波张成商华罗洁文王旗
Owner FUDAN UNIV
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