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Continuous type preparation method of biomass activated carbon

A technology of activated carbon and biomass, used in chemical instruments and methods, carbon compounds, inorganic chemistry, etc.

Inactive Publication Date: 2013-12-25
WUXI BAOHE BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent Publication No. CN101049930A "A Method for Preparing Activated Carbon from Wheat Straw" and Patent Publication No. CN 102838114A "A Method for Quickly Preparing Straw-based Activated Carbon" both disclose the process of phosphoric acid activation combined with microwave heating carbonization, but the production scale is small , continuous production cannot be realized, and phosphoric acid cannot be effectively recycled in the end, resulting in serious waste and environmental pollution; the patent of publication number CN 101780399A "a method for preparing gas-phase adsorption activated carbon from pine nut shells" uses hot water to wash carbonized materials multiple times Phosphoric acid is recovered by means of methods, but the operation is cumbersome, time-consuming and labor-intensive, and the recovery rate is low

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  • Continuous type preparation method of biomass activated carbon
  • Continuous type preparation method of biomass activated carbon

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Crush the straw to 0.5mm, and under the action of 100W ultrasound, mix it with a phosphoric acid solution with a mass fraction of 15% according to the solid-liquid mass volume ratio (g / ml) 1:10, activate for 40min; start the screw before the microwave reactor 1 The feeder continuously transports the activated rice straw powder into the microwave reactor 1, and simultaneously turns on the microwave reactor 1 with a microwave power of 800W. Stay in device 1 for 3 minutes to obtain the crude activated carbon product. At the same time, the gas obtained from the reaction enters the gas absorber 2 containing absorbent tap water through the air duct to absorb phosphoric acid in the gas; after the crude activated carbon product in microwave reactor 1 is slightly cooled, Under the pushing action of the screw feeder, it enters the water vapor purging device 3, is purged and washed by water vapor for 20 minutes, and finally enters the condensation dryer 4 for drying to obtain the f...

Embodiment 2

[0029] Grind the corn stalks to 3 mm, and mix them evenly with the phosphoric acid solution with a mass fraction of 30% according to the solid-liquid mass volume ratio (g / ml) 1:12 under the action of 200W ultrasonic waves, and activate for 10 minutes; proceed according to the method described in Example 1. Material, microwave heating, steam purging and condensation drying: microwave power is 500W, to ensure that the activated corn stalk powder stays in the microwave reactor 1 for 10 minutes, and the crude activated carbon is obtained. Gas absorber 2, to absorb phosphoric acid in the gas; after the crude activated carbon is slightly cooled, it enters the water vapor purger 3, is purged and washed with water vapor for 15 minutes, and finally enters the condensing dryer 4 to dry to obtain the finished activated carbon; collect the gas absorber The absorption liquid in 2 and the water vapor at the bottom of the steam sweeper 3 purge the residual gas condensate, which is the recover...

Embodiment 3

[0031] Grind the wheat straw to 5mm, and under the action of 150W ultrasound, mix it evenly with the phosphoric acid solution with a mass fraction of 20% according to the solid-liquid mass volume ratio (g / ml) 1:5, activate for 20min; feed according to the method described in Example 1 , Microwave heating, steam purging and condensation drying: microwave power 600W, to ensure that the activated wheat straw powder stays in the microwave reactor 1 for 8 minutes to obtain the crude activated carbon. device 2 to absorb phosphoric acid in the gas; after the crude activated carbon is slightly cooled, it enters the water vapor purger 3, is purged and washed with water vapor for 20 minutes, and finally enters the condensing dryer 4 to dry to obtain the finished activated carbon; collect the gas in the absorber 2 The absorption liquid and the water vapor at the bottom of the steam sweeper 3 purge the residual gas condensate, which is the reclaimed phosphoric acid solution. The concentra...

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Abstract

The invention discloses a continuous type preparation method of biomass activated carbon. The continuous type preparation method comprises the following steps of (1) activating, namely activating biomass raw materials by using phosphoric acid under the assistance of ultrasonic waves; (2) carrying out microwave heating carbonization at the microwave power of 500-800W for 3-10 minutes so as to obtain an activated carbon crude product, and meanwhile leading gas obtained after reaction into a gas absorber containing water; (3) purging and washing by using water vapor, condensing and drying, namely, purging and washing the activated carbon by using water vapor, then enabling the activated carbon to enter a condensation drier so as to be dried, thus obtaining an activated carbon finished product; and (4) recycling phosphoric acid, namely collecting an absorption liquid in the gas absorber and water vapor purging residual gas condensate in the step (3), namely recycling a phosphoric acid solution. The continuous type preparation method has the advantages of being simple in process, high in production efficiency, low in cost, economic and environment-friendly and can be used for preparing the activated carbon with excellent absorption performance, recovering the phosphoric acid at high efficiency so as to be recycled and realizing the industrial continuous type large-scale production.

Description

technical field [0001] The invention belongs to the technical field of activated carbon preparation, in particular to a method for preparing continuous biomass activated carbon with high phosphoric acid recovery rate. Background technique [0002] Activated carbon is an excellent adsorbent with developed pore structure and special surface characteristics, high adsorption capacity, renewable, acid and alkali resistance, heat resistance, and good chemical stability. It is widely used in environmental protection, chemical industry, food processing, Hydrometallurgy, drug refining and other fields. The raw materials used to make activated carbon are very wide, including wood chips, coal, bitumen and fruit shells. In recent years, with the shortage of wood and the increase in the cost of raw materials for fruit shells and stones, people have gradually shifted their attention to food waste residues and agricultural and sideline product wastes. Activated carbon product with fine p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/324C01B32/342
Inventor 王小泉罗虎
Owner WUXI BAOHE BIOTECH
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