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A method for preparing flexible block carbon by carbonization of small wood blocks

A technology of flexible blocks and wood blocks, which is applied in the field of preparation of flexible block carbon, can solve problems such as restricting applications, and achieve the effects of reducing preparation costs, easy process control, and reducing environmental pollution

Active Publication Date: 2021-06-04
INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although NFC-based aerogels have shown good results as oil absorbents in terms of their high absorption capacity, environmental friendliness, and sustainability, etc., the complex preparation process and tedious oil recovery process of cellulose aerogels (e.g., solvent Extraction and distillation) there are still deficiencies in the preparation process of activated carbon, which are still obstacles restricting its application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: a kind of method utilizing small wood block charcoal to prepare flexible bulk charcoal, comprises the steps:

[0025] (1) Drying treatment of wood: make the wood into 2cm×2cm×2cm~15cm×15cm×10cm (horizontal×chord×longitudinal) wooden blocks, place them in an oven, and carry out drying treatment at 103 ±2°C, after drying for 6 hours, weigh the mass of the wood block every two hours until it is in an absolute dry state with a constant mass of wood block.

[0026] (2) Removal of lignin: Put the dry wood blocks in a treatment tank, add 65ml of distilled water for every 2g of dry wood blocks, then add 0.5mL of glacial acetic acid, and add 0.663g of sodium chlorite to adjust the pH To 4 ~ 5, 90 ~ 100 ℃ constant temperature oil bath heating, 50 ~ 200rpm mechanical stirring treatment for 6 ~ 7 h.

[0027] (3) After the reaction, release the treatment reaction solution, recycle and reuse, and wash repeatedly with distilled water until the pH of the wood block is ne...

Embodiment 2

[0038] Cut balsa wood, such as poplar, into a size of 15cm×15cm×10cm (horizontal×chordwise×longitudinal), place it in an oven at a drying temperature of 103°C, and dry it until the quality of the wood block is constant. Put the dry wood block in the treatment tank, add 650ml of distilled water for every 20g of dry wood block, add 0.5mL of glacial acetic acid, add 8.5g of sodium chlorite (mass fraction is 80%), adjust the pH to 4~ 5. Heating in a constant temperature oil bath at 90°C, mechanical stirring at 200rpm / min, adding materials (including dry wood blocks and the solution) every hour, and stopping heating and stirring after repeating 6 times. After the reaction, the wood block was repeatedly washed with distilled water until its pH was neutral. The neutral wood blocks were replaced with tert-butanol for 1 h, then frozen at -70°C for 5 h, and dried in a freeze dryer for 72 h to obtain wood-based skeleton wood blocks. Put the wood-based skeleton wood blocks in the treatme...

Embodiment 3

[0040]Cut the balsa wood into a size of 2cm×2cm×3cm (horizontal×chordwise×longitudinal), put it in an oven at 105°C, and dry it to a dry state. Put the dry wood blocks in the treatment tank, add 650ml of distilled water, add 8.5g of sodium chlorite (mass fraction is 80%), add 0.5mL of glacial acetic acid to adjust the pH to 4~5,90 ℃ constant temperature oil bath heating, 200rpm / min mechanical stirring treatment, adding material once every hour, after repeating 5 times, the wood block becomes soft, in order to prevent the damage of the surface of the wood block due to the mechanical stirring of the rotor, stop the mechanical stirring at this time. Each small addition is like this, after continuing to repeat 4 times, stop heating and stirring. After the reaction, the wood block was repeatedly washed with distilled water until its pH was neutral. Then, the obtained wood block was replaced with tert-butanol for 1 h, and then the wood block was frozen at -50° C. for 5 h, and then ...

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Abstract

The invention belongs to a method for preparing flexible block charcoal by carbonizing small wood blocks. The method is to remove the lignin in the wood block by chemical reagent treatment, then replace with higher alcohol and freeze-dry to obtain the wood-based skeleton, and finally the obtained wood The base skeleton is carbonized at high temperature under the protection of an inert gas to obtain a flexible bulk carbon with a wavy layered skeleton structure. The invention can obtain high hydrophobicity and lipophilicity, good compressibility and elastic flexible block carbon, and has the advantages of simple preparation process, easy process control, wide source of raw materials, safety and non-toxicity, lower preparation cost and less environmental pollution.

Description

technical field [0001] The invention belongs to a method for preparing flexible block carbon by carbonizing small wood blocks. Background technique [0002] Activated carbon (flexible bulk carbon) can be widely used in environmental restoration, lithium-ion batteries, ion exchange resins, adsorption materials and other fields. The production process of activated carbon is divided into carbonization, cooling, activation and washing processes. In the carbonization process, the wood is placed in an inert atmosphere at high temperature and pyrolyzed to reduce the non-carbon elements in the wood, thereby preparing flexible block carbon. The traditional method rarely obtains or preserves the wavy layered skeleton structure in wood, which makes the hydrophobicity, lipophilicity, compressibility and elasticity of activated carbon poor, and the reuse rate is low, and the preparation process is complicated, the preparation cost is high, and the process control is difficult. [0003] ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/05
CPCC01B32/05
Inventor 卢芸刘波殷亚方
Owner INST OF WOOD INDUDTRY CHINESE ACAD OF FORESTRY
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