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Preparation method of sawdust activated carbon by phosphoric acid method

A technology of activated carbon and phosphoric acid, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of increased phosphoric acid consumption, increased phosphoric acid consumption, increased manufacturing cost, etc., and achieves the effect of good effect and high adsorption performance.

Inactive Publication Date: 2018-12-21
贵州森环活性炭有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] According to the preparation method of phosphoric acid sawdust activated carbon in the prior art, the methylene blue adsorption value of the obtained activated carbon is generally about 350ml / mg, and the decolorization rate of caramel is generally about 110%. To obtain activated carbon with higher indicators, it is necessary to increase the amount of phosphoric acid At the same time, it is necessary to increase the activation temperature, which will increase the consumption of phosphoric acid, increase energy consumption, and increase the cost of product manufacturing.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing woody activated carbon by phosphoric acid method, the method uses sawdust as raw material, phosphoric acid as activator, adopts carbonization and activation distribution to prepare activated carbon; the steps are: wood chips and phosphoric acid are fully kneaded according to the weight ratio of 1:1 After kneading and mixing, carbonize at 150°C for 25 minutes and activate at 350°C for 40 minutes; gradient rinse the activated carbon with hot water to recover phosphoric acid, then dry and grind at 145°C, that is Get activated carbon.

[0022] The prepared powdery activated carbon has been tested, the water content is ≤8%, the methylene blue adsorption value is 225ml / g, and the caramel decolorization rate of A method is 95%.

Embodiment 2

[0024] A method for preparing woody activated carbon by phosphoric acid method, the method uses wood chips as raw material, phosphoric acid as activator, adopts carbonization and activation distribution to prepare activated carbon; the steps are: wood chips and phosphoric acid are fully kneaded according to the weight ratio of 1:1.3 After kneading and mixing, carbonize at 200°C for 25 minutes and activate at 400°C for 50 minutes; gradient rinse the activated carbon with hot water to recover phosphoric acid, then dry and grind at 145°C, that is Get activated carbon.

[0025] The prepared powdery activated carbon was tested, the water content was ≤8%, the adsorption value of methylene blue was 240ml / g, and the caramel decolorization rate of method A was 100%.

Embodiment 3

[0027] A method for preparing woody activated carbon by phosphoric acid method, the method uses sawdust as raw material, phosphoric acid as activator, adopts carbonization and activation distribution to prepare activated carbon; the steps are: wood chips and phosphoric acid are fully kneaded according to the weight ratio of 1:1.5 After kneading and mixing, carbonize at 250°C for 25 minutes and activate at 450°C for 50 minutes; gradient rinse the activated carbon with hot water to recover phosphoric acid, then dry and grind at 145°C, that is Get activated carbon.

[0028] The prepared powdery activated carbon was tested, the water content was ≤8%, the adsorption value of methylene blue was 270ml / g, and the caramel decolorization rate of method A was 115%.

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Abstract

The invention discloses a preparation method of sawdust activated carbon by a phosphoric acid method. The preparation method comprises the following operation steps: sufficiently kneading, stirring and uniformly mixing sawdust and phosphoric acid according to the weight ratio of 1 to 1-2 and carbonizing at 100 to 300 DEG C; then putting a carbonized substance into an activation furnace and activating at 350 to 600 DEG C; soaking with hot water and washing, carrying out gradient recovery on phosphoric acid and completely recovering the phosphoric acid; drying the obtained material at 100 to 200DEG C, and then grinding, namely obtaining the sawdust activated carbon. According to the preparation method disclosed by the invention, by distinguishing carbonization from activation, the preparedactivated carbon has a more developed medium pore structure under the same activation temperature conditions; the activated carbon with higher adsorption performance is obtained and the sawdust activated carbon is enabled to have a better purification effect in a liquid phase.

Description

technical field [0001] The invention relates to the preparation technology of activated carbon, in particular to a method for preparing powdered activated carbon with high adsorption performance by using sawdust as raw material, phosphoric acid as activator, and adopting a step-by-step carbonization and activation method. Background technique [0002] Activated carbon is a carbon material with developed pore structure, large specific surface area, and strong selective adsorption capacity. Its basic structural unit is graphite-like crystallite formed by hybridization of carbon atoms. Powdered activated carbon produced by chemical method has well-developed medium and large pores, and is mainly used in liquid phase purification process. According to different chemical activators, the products are mainly divided into phosphoric acid method, zinc chloride method, potassium hydroxide method, etc. The zinc chloride method has basically been eliminated due to the severe environment;...

Claims

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Application Information

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IPC IPC(8): C01B32/342
CPCC01B32/342
Inventor 舒洪南吴俊白首龙舒军
Owner 贵州森环活性炭有限公司