Method of preparing sawdust as raw material into particular active carbons

A technology of granular activated carbon and sawdust, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of low specific surface area and total pore volume of granular activated carbon, large energy consumption, long process cycle, etc. Appearance, improved specific surface area, and shortened process time

Active Publication Date: 2013-04-24
SHANGHAI SUNSON ACTIVATED CARBON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] U.S. patents US5206207, US5324703, etc. use woody raw materials at 480 ° C (no residence time in the patent) to prepare a specific surface area of ​​2500m2 through phosphoric acid activation. 2 Granular activated carbon of about 1000 g / g, although its adsorption performance is strong, its process cycle is as long as tens of hours, and the energy consumption is relatively large; in addition, the specific surface area and total pore volume of the obtained granular activated carbon are not high.

Method used

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  • Method of preparing sawdust as raw material into particular active carbons

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Embodiment 1

[0028] Dry the sawdust and pulverize it with a pulverizer, use a vibrating sieve to remove the coarse and fine sawdust (screen mesh number 12-40 mesh), and then mix the sawdust and phosphoric acid solution (concentration 55%) and Na2HPO4 with 3% phosphoric acid solution quality Stir evenly, the ratio of phosphorus to wood used is 1.5:1, place it in a heating barrel and heat it to 30°C with steam, stop heating, impregnate at low temperature and keep it warm for 1 hour. After the heat preservation is over, release the sawdust in the barrel and send it to the rotary furnace for plasticization. The plasticization temperature is controlled at 90°C and the plasticization time is about 1 hour. The plasticized plastic material is sent to the kneader for 40 minutes, and then The extruder is extruded into a columnar shape of about 4mm, and then the columnar material is transferred to a fixed dryer for 0.5 hours. The drying temperature is controlled at 150°C. Constant temperature activat...

Embodiment 2

[0030] Dry the sawdust and pulverize it with a pulverizer, and use a vibrating sieve to remove the coarse and fine sawdust (mesh 12-40 mesh), and then mix the sawdust with phosphoric acid solution (concentration 55%) and phosphoric acid solution with 3% Na 2 Stir the HPO4 evenly, the ratio of phosphorus to wood used is 1.5:1, place it in a heating barrel and heat it to 45°C with steam, stop heating, and keep it warm for 2 hours. After the heat preservation is over, release the wood chips in the barrel and send them to the rotary furnace for plasticization. The plasticization temperature is controlled at 100°C, and the plasticization time is about 1 hour. The extrusion machine is extruded into a columnar shape of about 4mm, and the columnar material is transferred to a ball forming machine to form a ball, and then the spherical material is transferred to a fixed dryer for drying for 30 minutes. The drying temperature is controlled at 160 ° C, and the dried material is transferre...

Embodiment 3

[0032] Dry the sawdust and pulverize it with a pulverizer, and use a vibrating sieve to remove the coarse and fine sawdust (mesh 12-40 mesh), and then mix the sawdust with phosphoric acid solution (concentration 55%) and phosphoric acid solution with 3% Na 2 Stir the HPO4 evenly, the ratio of phosphorus to wood used is 1.5:1, place it in a heating barrel and heat it to 60°C with steam, stop heating, and keep it warm for 2.5 hours. After the heat preservation is over, release the sawdust in the barrel and send it to the rotary furnace for plasticization. The plasticization temperature is controlled at 120°C, and the plasticization time is about 1 hour. The plasticized material is sent to the kneader for 40 minutes, and then used The extruder is extruded into a columnar shape of about 4mm, and the columnar material is transferred to a ball forming machine to form a ball, and then the spherical material is transferred to a fixed dryer for drying for 2 hours. The drying temperature...

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Abstract

The invention relates to a method of preparing sawdust as a raw material into particular active carbons. The method comprises the following steps of: a, crushing the sawdust into certain granularity, and then drying for further use; b, mixing phosphoric acid and the sawdust obtained in the step a according to a certain ratio of the phosphoric acid to the sawdust, and adding disodium hydrogen phosphate as a cocatalyst to obtain a mixture in process of mixing; and c, obtaining the particular active carbons after the mixture is dipped at low temperature, plasticized, kneaded, extruded and formed, dried, carbonized, activated, recovered, rinsed, crushed and screened in sequence. The method is short in process period, and the active carbon with higher specific surface area and total pore volume can be prepared.

Description

technical field [0001] The invention relates to a method for preparing granular activated carbon by using sawdust as raw material. Background technique [0002] Granular activated carbon includes cylindrical, spherical and amorphous granules. Compared with cylindrical and amorphous granular carbon, spherical activated carbon has the advantages of high packing density, easy filling, wear resistance, easy regeneration and long service life. With the continuous development of industry and the continuous progress of society, the application field of spherical activated carbon Wider and wider. The main application areas of granular activated carbon include: [0003] Solvent recovery: There are various organic solvents used in the industry. When high-quality products are produced, some organic solvents are discharged into the atmosphere to cause pollution and cause profound social problems. To this end, a Japanese chemical engineering company has developed a solvent recovery de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/12C01B32/324C01B32/348
Inventor 郑迅荟朱光真金仲文
Owner SHANGHAI SUNSON ACTIVATED CARBON TECH
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