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Lignin-based activated carbon microsphere and preparation method and application thereof

An activated carbon microsphere and lignin-based technology, which is applied in the field of wood liquefaction, can solve the problems of poisoning and increasing environmental pollution, and achieve the effect of regular shape, uniform appearance and many internal pores

Active Publication Date: 2016-02-03
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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  • Lignin-based activated carbon microsphere and preparation method and application thereof
  • Lignin-based activated carbon microsphere and preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0027] The preparation of embodiment 1 lignin-based activated carbon microspheres

[0028] Preparation includes the following steps:

[0029] 1) Crush waste wood to obtain wood powder, dry the wood powder and mix it with phenol at a weight ratio of 1:4, then add phosphoric acid with a concentration of 85% according to 10% of the weight of phenol, stir and liquefy at 160°C for 2.5 hours, Wood liquefaction was obtained after Buchner funnel suction filtration;

[0030] 2) Preparation of microspheres: add water to the reaction kettle, and then add polyvinyl alcohol as a stabilizer with 15% water quality, and PEG800 with 20% water quality as a surfactant, stir and adjust the solution temperature to 60°C, and control the stirring speed 800r / min, add wood liquefaction according to 10% of the water quality, react for 8h, the obtained product is filtered through a Buchner funnel, and vacuum-dried at 50°C to obtain lignin-based microspheres;

[0031] 3) Microsphere solidification: Add...

Embodiment 2

[0034] The preparation of embodiment 2 lignin-based activated carbon microspheres

[0035] Preparation includes the following steps:

[0036] 1) Crush waste wood to obtain wood powder, dry the wood powder and mix it with phenol at a weight ratio of 1:4, then add phosphoric acid with a concentration of 85% according to 8% of the weight of phenol, stir and liquefy at 160°C for 2.5 hours, Wood liquefaction was obtained after Buchner funnel suction filtration;

[0037] 2) Preparation of microspheres: add water to the reaction kettle, and then add polyvinyl alcohol as a stabilizer with 1% water mass, and PEG400 as a surfactant with 1% water mass, stir and adjust the solution temperature to 25°C, and control the stirring speed 100r / min, add wood liquefaction according to 60% of the water quality, and react for 1h. The obtained product is filtered through a Buchner funnel and vacuum-dried at 40°C to obtain lignin-based microspheres;

[0038] 3) Microsphere solidification: add a mix...

Embodiment 3

[0040] The preparation of embodiment 3 lignin-based activated carbon microspheres

[0041] Preparation includes the following steps:

[0042] 1) Crush waste wood to obtain wood powder, dry the wood powder and mix it with phenol at a weight ratio of 1:4, then add phosphoric acid with a concentration of 85% according to 12% of the weight of phenol, stir and liquefy at 160°C for 2.5 hours, Wood liquefaction was obtained after Buchner funnel suction filtration;

[0043] 2) Preparation of microspheres: Add water to the reaction kettle, and then add polyvinyl alcohol as a stabilizer with 30% water mass, and PEG1000 with 40% water mass as a surfactant, stir and adjust the solution temperature to 90°C, and control the stirring speed 1200r / min, according to the water quality of 50%, add wood liquefaction, react for 10h, the obtained product is filtered through Buchner funnel, vacuum-dried at 45°C to obtain lignin-based microspheres;

[0044] 3) Microsphere solidification: Add a mixture...

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Abstract

The invention provides a lignin-based activated carbon microsphere and a preparation method thereof. Wood powder and phenol are mixed and liquified under the condition that an acidic catalyst exists, then a stabilizer and a surfactant are added into the wood liquified matter to prepare a microsphere, then the microsphere is cured and carbonized, and the activated carbon microsphere is prepared. The prepared microsphere has the advantages of being uniform in surface, regular in shape, uniform in density during filling, large in internal pore number and the like, and can be used in the fields of adsorption materials and electrochemical materials. Wood serves as the raw material to prepare the lignin-based activated carbon microsphere, utilization additive value of wood is increased, and the problem that preparation of an activated carbon microsphere with phenolic resin as the raw material depends on fossil resources is reduced. In the curing process of the microsphere, formaldehyde does not need to be added, emission of toxic waste gas in the preparation process is reduced, and damage to human bodies and environment pollutions of harmful gas are avoided in the production process.

Description

technical field [0001] The invention relates to wood liquefaction technology, in particular to a lignin-based activated carbon microsphere, its preparation method and application. 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 solution conta...

Claims

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Application Information

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IPC IPC(8): C01B31/08
Inventor 商俊博苏子牧郭思岑赵广杰林剑
Owner BEIJING FORESTRY UNIVERSITY
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