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One-step method for preparing wood-based activated carbon microspheres and its application

A technology based on activated carbon and wood, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve problems such as poisoning and increasing environmental pollution, and achieve the effects of reducing dependence, reducing poisoning and environmental pollution, and reducing toxicity

Active Publication Date: 2021-02-02
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned methods all use phenolic resin synthesized from phenol and formaldehyde as the main raw material for preparing microspheres. The large-scale use of formaldehyde causes the generation of harmful gases in the production process, which is poisonous to the human body and increases environmental pollution.

Method used

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  • One-step method for preparing wood-based activated carbon microspheres and its application
  • One-step method for preparing wood-based activated carbon microspheres and its application
  • One-step method for preparing wood-based activated carbon microspheres and its application

Examples

Experimental program
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Effect test

Embodiment 1

[0037] This embodiment provides a method for preparing wood-based activated carbon microspheres in one step, and the specific steps are as follows:

[0038] 1) Mix 100g of 40-mesh wood powder obtained by crushing wood with 400g of phenol, add 50g of acidic catalyst phosphoric acid, and 25g of PEG600, keep warm at 130°C for 2h, and set aside;

[0039] 2) After fully mixing 25g of hexamethylenetetramine, 5g of polyethylene glycol and 100g of polyvinyl alcohol, add to the system obtained in step 1) and stir and keep warm at 130°C for 60min to form wood-based microspheres, which are pre-oxidized (heating Speed ​​1°C / min, heat up to 280°C, keep warm for 2h) and activation treatment (at a heating rate of 4°C / min, keep at a constant temperature of 800°C for 60min), to obtain wood-based activated carbon microspheres.

[0040] figure 1 It is the scanning electron microscope picture of the wood-based activated carbon microspheres prepared in Example 1.

Embodiment 2

[0042] This embodiment provides a method for preparing wood-based activated carbon microspheres in one step, and the specific steps are as follows:

[0043]1) Mix 100g of 40-mesh wood powder obtained by crushing wood with 300g of phenol, add 25g of acidic catalyst phosphoric acid, and 15g of PEG600, keep warm at 150°C for 3h, and set aside;

[0044] 2) After fully mixing 20g of hexamethylenetetramine, 20g of polyethylene glycol and 100g of polyvinyl alcohol, add to the system obtained in step 1) and stir and keep warm at 150°C for 120min to form wood-based microspheres, which are pre-oxidized (heating Speed ​​0.5°C / min, heating up to 250°C, holding for 1h) and activation treatment (at a heating rate of 4°C / min, 800°C constant temperature for 90min), to obtain wood-based activated carbon microspheres.

Embodiment 3

[0046] This embodiment provides a method for preparing wood-based activated carbon microspheres in one step, and the specific steps are as follows:

[0047] 1) Mix 100g of 60-mesh wood powder obtained by crushing wood with 500g of phenol, add 60g of acidic catalyst phosphoric acid, and 50g of PEG800, keep warm at 160°C for 2h, and set aside;

[0048] 2) After fully mixing 50g of hexamethylenetetramine, 5g of polyethylene glycol and 100g of polyvinyl alcohol, add it to the system obtained in step 1) and stir and keep warm at 160°C for 30min to form wood-based microspheres, which are pre-oxidized (heating Rate 2°C / min, heat up to 310°C, hold for 1h) and activation treatment (at a heating rate of 4°C / min, keep at a constant temperature of 900°C for 30min), to obtain wood-based activated carbon microspheres.

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Abstract

The invention relates to a method and application of one-step preparation of wood-based activated carbon microspheres. The method of the present invention comprises: mixing wood powder obtained by pulverizing wood with phenol, under the condition of an acidic catalyst and an active agent, after heating and keeping warm to obtain a mixed system; mixing hexamethylenetetramine, polyethylene glycol and a stabilizer After being fully mixed, it is added into the mixing system to form wood-based microspheres, and then pre-oxidized and activated to obtain wood-based activated carbon microspheres. The invention has the following advantages: the method is simple, and the microspheres are prepared in one process in one step. Part of the source of raw materials is wood, which increases the added value of wood utilization and reduces the dependence on fossil resources, which is in line with the development direction of environmental protection and sustainable utilization of resources. The use of chemical agents such as formaldehyde and hydrochloric acid for pre-oxidation is reduced, and the toxicity and waste gas emission in the preparation process are reduced. Avoid the damage of harmful gases to the human body and the pollution of the environment during the production process.

Description

technical field [0001] The invention relates to the preparation of microspheres, in particular to a method and application of one-step preparation of wood-based activated carbon microspheres. Background technique [0002] Activated carbon microspheres have good physical properties and adsorption properties. They have uniform appearance, regular shape, high mechanical strength, large specific surface area, and good rolling properties in spherical shape. When filled as gas phase or liquid chromatography column packing, the density is uniform. The flow resistance to the adsorbed and purified gas or liquid is small. [0003] Disclosed in ZL200410012346.X is a preparation method of phenolic resin-based microspheres, after novolac resin is mixed with hexamethylenetetramine, dissolved in methanol and / or ethanol to form phenolic resin alcohol solution; surfactant and water Prepare an aqueous solution containing a surfactant; add the phenolic resin alcohol solution to the aqueous so...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/318
CPCC01B32/318
Inventor 商俊博林剑赵广杰
Owner BEIJING FORESTRY UNIVERSITY
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