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Method for preparing honeycomb-type multiporous foam carbon with high specific surface area from larix gmelini sawdust

A high specific surface area, porous foam technology, applied in the preparation/purification of carbon, etc., can solve the problems of poor strength of foamed carbon, limited application fields, etc., and achieve the effects of reducing environmental burden, simplifying process, and easy synthesis process

Inactive Publication Date: 2014-05-21
NORTHEAST FORESTRY UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] To sum up, there are few patents on liquefied biomass being used to make foam carbon materials, and it is even rarer to see that it is used to make ordered foam carbon. The traditional preparation method of foam carbon only has high The specific surface area and pore structure, but the strength of foam carbon after activation is not good, which limits its application field

Method used

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  • Method for preparing honeycomb-type multiporous foam carbon with high specific surface area from larix gmelini sawdust
  • Method for preparing honeycomb-type multiporous foam carbon with high specific surface area from larix gmelini sawdust
  • Method for preparing honeycomb-type multiporous foam carbon with high specific surface area from larix gmelini sawdust

Examples

Experimental program
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Embodiment 1

[0022] (1) Add larch sawdust (80 mesh, dry at 105°C for 8 hours), phenol, concentrated sulfuric acid (98%) and concentrated phosphoric acid (85%) to a four-necked bottle at a ratio of 20g:60g:1mL:1.7mL , install a stirrer and a condenser, heat it, react at reflux temperature (120-140°C) for 1 hour, cool to room temperature, add about 130mL of methanol, stir well, and filter. The filtrate was neutralized to neutral with sodium carbonate, filtered to remove insoluble matter such as salt, and methanol was distilled off under reduced pressure to obtain brown liquefied larch.

[0023] (2) Add 100mL of formaldehyde solution (37%) and 1g of sodium hydroxide for every 20g of liquefied larch sawdust, stir, heat up to 50-60°C, keep warm for 0.5h, add ethanol-dissolved PEG2000 (accounting for about 8% of larch sawdust), continue to react for 1.5h, then heat and reflux at 90-98°C for 1h, cool the product to 60°C, react at this temperature for 0.5h, adjust the pH value to neutral, reduce ...

Embodiment 2

[0027] (1) Add larch sawdust (80 mesh, dry at 105°C for 8 hours), phenol, concentrated sulfuric acid (98%) and concentrated phosphoric acid (85%) to a four-necked bottle at a ratio of 20g:60g:1mL:1.7mL , install a stirrer and a condenser, heat it, react at reflux temperature (120-140°C) for 1 hour, cool to room temperature, add about 130mL of methanol, stir well, and filter. The filtrate was neutralized to neutral with sodium carbonate, filtered to remove insoluble matter such as salt, and methanol was distilled off under reduced pressure to obtain brown liquefied larch.

[0028] (2) Add 100mL of formaldehyde solution (37%) and 1g of sodium hydroxide for every 20g of liquefied larch sawdust, stir, heat up to 50-60°C, keep warm for 0.5h, add ethanol-dissolved PEG2000 (accounting for about 8% of larch sawdust), continue to react for 1.5h, then heat and reflux at 90-98°C for 1h, cool the product to 60°C, react at this temperature for 0.5h, adjust the pH value to neutral, reduce ...

Embodiment 3

[0031] (1) Add larch sawdust (80 mesh, dry at 105°C for 8 hours), phenol, concentrated sulfuric acid (98%) and concentrated phosphoric acid (85%) to a four-necked bottle at a ratio of 20g:60g:1mL:1.7mL , install the stirrer and

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Abstract

The invention discloses a method for preparing honeycomb-type multiporous foam carbon with the high specific surface area from larix gmelini sawdust. The method is characterized by comprising the steps of heating for liquefying the larix gmelini sawdust as the raw material through phenol, and heating for carbonizing to prepare the honeycomb-type multiporous foam carbon, wherein thermosetting resin which is synthesized by a liquefied object serves as a precursor, PEG2000 serves as a pore forming substance, n-pentane serves as a foaming agent and concentrated sulfuric acid serves as a curing agent under the protection of N2; the apparent density of the prepared foam carbon is 0.020-0.035g / cm<3>; the specific surface area is 1,580.97m<2> / g; the pore volume is 0.885cm<3> / g; the average aperature is 2.1-2.5nm. The operation technology has the main characteristics that raw materials are environmentally-friendly, low in cost and readily available; the foam carbon is not activated, so that the large pore volume and the large specific surface area can be realized, and a complete honeycomb-type structure and an ordered microporous structure can be formed; and therefore, the foam carbon can be recycled under high intensity, and small circular holes with the aperture of about 1.0-1.5 microns are uniformly distributed in tough bands and porous walls, so that gas and liquid can enter the foam carbon; due to the large specific surface area and the large pore volume, the honeycomb-type multiporous foam carbon can be used as a novel adsorption material with a specific function.

Description

Technical field: [0001] The invention relates to the field of carbon material preparation, in particular to a method for preparing high specific surface area honeycomb porous foam carbon from larch sawdust. Background technique: [0002] Foam carbon has the characteristics of high specific surface area and stable structure of carbon materials, as well as low density and good heat insulation. It can be widely used in adsorption separation, supported catalysis, electrode materials, military and aerospace and other fields. Most of the traditional carbon foam precursors use coal and petroleum as raw materials. With the aggravation of the energy crisis, it is urgent to find new renewable energy as a substitute. Biomass is an effective renewable energy source. Carbon materials can be prepared by direct pyrolysis of fruit shells, fruit stones, wood chips or other biomass. However, most of these carbon materials do not have an ordered structure, and it is difficult to control the po...

Claims

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Application Information

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IPC IPC(8): C01B31/02C01B32/05
Inventor 刘守新李伟吴优赵鑫
Owner NORTHEAST FORESTRY UNIVERSITY
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