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Production method of xyloid coal-based shaped active carbon

A technology for forming activated carbon and wood coal, which is applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of non-renewable coal energy and other problems of the use cost of adhesives, and reduce the consumption of pulverized coal resources and increase production. cost, the effect of increasing the complexity of the process

Active Publication Date: 2015-06-17
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention proposes a production method of woody coal-based shaped activated carbon, the purpose of which is to prepare woody coal-based activated carbon by using biomass sawdust as an adhesive without adding an adhesive and reducing the consumption of coal powder. Shaped activated carbon, to solve the problems of adhesive use cost and non-renewable coal energy in traditional preparation methods

Method used

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  • Production method of xyloid coal-based shaped active carbon

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[0015] The process parameters for preparing the shaped carbonaceous precursor are: impregnation with phosphoric acid with a mass concentration of 30% to 50%, impregnation temperature at 50°C to 70°C, plasticization temperature at 150°C to 190°C, mass ratio of wood chips to coal powder It is 1:1~1:4, the mass ratio of sawdust and phosphoric acid is 1:1~1:4, and the molding pressure is 30MPa.

[0016] The process parameters for the combination of wood-based activated carbon and coal-based activated carbon are: the impregnation ratio, that is, the mass ratio of phosphoric acid to the shaped carbon precursor, is 0:1-2:1, the activation temperature is 400-600°C, and the activation time is 1 h-3 h.

Embodiment 1

[0018] Crush wood chips to 30 mesh and coal powder to 200 mesh, mix them at a mass ratio of 1:4, and then soak them in 30% phosphoric acid solution, then take them out and plasticize them in an oil bath at 180°C until the color of the mixture changes from brown to black. And when a greater viscosity is produced, the plasticization is ended and a plasticized product is obtained. The obtained plasticized product is quickly transferred to the mold and formed on the hydraulic press. The pressed carbonaceous precursor molding was slowly dried and hardened in a drying oven at a constant temperature, and the strength of the shaped carbonaceous precursor was measured to be 93%. The shaped carbonaceous precursor is sent into a tube furnace for carbonization and activation at an activation temperature of 550°C and an activation time of 2.5 hours to prepare a woody coal-based shaped activated carbon with a diameter of 3 mm, a length of 10-20 mm, a strength of 88%, and an adsorption value...

Embodiment 2

[0021] Crush wood chips to 40 mesh and coal powder to 200 mesh, mix them at a mass ratio of 1:3, soak them in 40% phosphoric acid solution, take them out and plasticize them in an oil bath at 190°C until the color of the mixture changes from brown to black. And when a greater viscosity is produced, the plasticization is ended and a plasticized product is obtained. The obtained plasticized product is quickly transferred to the mold and formed on the hydraulic press. The pressed carbonaceous precursor molding was slowly dried and hardened in a drying oven at a constant temperature, and the strength of the shaped carbonaceous precursor was measured to be 91%. The shaped carbonaceous precursor is sent into a tube furnace for carbonization and activation at an activation temperature of 500°C and an activation time of 1.5 h to prepare a woody coal-based shaped activated carbon with a diameter of 3 mm, a length of 10-20 mm, a strength of 87%, and an adsorption value of methylene blue...

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Abstract

The invention discloses a production method of xyloid coal-based shaped active carbon. The production method comprises the following steps: (1) wood chips and coal powder are mixed according to a ratio, are then taken out after being dipped in phosphoric acid solution, and are plastified in an oil bath pan; the plastifying is completed until the color of the mixture is changed from brown to black and greater viscosity is generated; a plastified product is obtained; (2) the plastified product is quickly transferred onto a mold for forming on a hydropress; a carbon precursor formed object obtained through pressing is put in a drying box for slow drying and hardening at a constant temperature; (3) the formed carbon precursor is carbonized and activated in an activating furnace to prepare the xyloid coal-based shaped active carbon. The production method has the advantages of overcoming the defects such as pollution, high cost, difficulty in transport and preservation, poor stability, poor compatibility and complex technique due to the addition of adhesive in the traditional technique, using the wood chips to take an effect similar to that of the adhesive, and using part wood chips to replace coal powder to reduce the consumption of coal powder resource.

Description

technical field [0001] The invention relates to a production method of woody coal-based shaped activated carbon, which belongs to the technical field of novel activated carbon composite preparation. Background technique [0002] Activated carbon is an important material involved in many fields of military, civil and industry. Coal-based activated carbon is currently the largest activated carbon product at home and abroad. The preparation process of coal-based shaped activated carbon is generally: the raw coal is first crushed and pulverized, then mixed with a binder, shaped by molding equipment, and the shaped material is then carbonized and activated. Commonly used binders are: coal tar, coal tar pitch and petroleum pitch. The use of these adhesives increases the production cost on the one hand, and there are some problems. Such as coal tar pollution, high cost, heat preservation operation, transportation and storage difficulties; coal tar pitch poor stability, toxic and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B31/08C01B32/324C01B32/33C01B32/342
Inventor 周建斌陆永玉陈登宇王恋李菲菲张伟
Owner NANJING FORESTRY UNIV