A processing technology for increasing the specific surface area of ​​activated carbon through baking pretreatment

A technology of specific surface area and processing technology, applied in the field of processing technology of baking pretreatment to increase the specific surface area of ​​activated carbon, can solve the problems of reduced yield of activated carbon, easy bond breakage, condensation, environmental pollution, etc., to improve the specific surface area and increase the degree of polymerization. , the effect of improving quality

Active Publication Date: 2022-02-15
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Activated carbon is a functional carbon material with well-developed pores and strong adsorption capacity. Activated carbon has stable physical and chemical properties, acid and alkali resistance, and heat resistance. Widely used, industrial activated carbon is prepared by carbonization and activation with coal, asphalt, biomass, etc. , renewable and environmentally friendly biomass raw materials are important substitutes. Lignin is the second most abundant natural raw material in nature. In industry, lignin generally comes from black liquor discharged from paper mills or leftovers from the production of bioethanol China currently produces more than 20 million tons of industrial lignin every year, but more than 98% of industrial lignin is directly burned. Although there are some other applications, such as adhesives and plastic additives, so far there is no For large-scale applications, lignin has a high carbon content and is a better raw material for the preparation of activated carbon. Since the lignin units are connected to each other through carbon-carbon bonds and ether bonds, the different connection methods between the units contain more terminal positions. Hydroxyl, methoxy, and carbonyl groups are easy to break bonds and condense when heated. When preparing activated carbon, it needs to be carbonized and activated at high temperature, and lignin will decompose violently at about 330°C, resulting in a decrease in the yield of activated carbon after carbonization and activation. And high specific surface area can improve the adsorption capacity of activated carbon, therefore, we propose a processing technology to improve the specific surface area of ​​activated carbon through baking pretreatment

Method used

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  • A processing technology for increasing the specific surface area of ​​activated carbon through baking pretreatment
  • A processing technology for increasing the specific surface area of ​​activated carbon through baking pretreatment

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Take lignin and place it in a tube furnace, heat it up to 180°C at a heating rate of 5°C / min, and keep it at this temperature for 30 minutes. The condensable liquid in the gas generated by baking is separated by indirect cooling with water to obtain product A;

[0034] After the previous step, stop heating and cool the product A to room temperature, take pure water to dissolve the activator to prepare an activator solution, and mix it with the product A in proportion according to the ratio of product A: activator mass ratio of 1:1 to prepare Obtain product B, wherein activator is potassium hydroxide;

[0035] Take the product B obtained in the previous step and place it in an oven, dry it at 100°C for 4 hours, transfer it to a tube furnace, and raise the temperature to 885°C at a rate of 2°C / min under the protection of nitrogen or other inert gases , heat preservation and activation for 30 minutes to obtain product C;

[0036] The product C obtained in the previous ste...

Embodiment 2

[0038] Take lignin and place it in a tube furnace, heat it up to 240°C at a heating rate of 12°C / min, and keep it at this temperature for 75min, and the condensable liquid in the gas generated by roasting is separated by indirect cooling with water to obtain product A;

[0039] After the previous step, stop heating and cool the product A to room temperature, dissolve the activator in pure water to prepare an activator solution, and mix it with the product A in proportion according to the ratio of product A: activator mass ratio of 2:5 to prepare Obtain product B, wherein activator is sodium hydroxide;

[0040] Take the product B obtained in the previous step and place it in an oven, dry it at 105°C for 5 hours, transfer it to a tube furnace, and raise the temperature to 900°C at a rate of 6°C / min under the protection of nitrogen or other inert gases , heat preservation and activation for 60min to obtain product C;

[0041]The product C obtained in the previous step was cooled...

Embodiment 3

[0043] Take lignin and place it in a tube furnace, heat it up to 300°C at a heating rate of 20°C / min, and keep it at this temperature for 120 minutes. The condensable liquid in the gas generated by baking is separated by indirect cooling with water to obtain product A;

[0044] After the previous step, stop heating and cool the product A to room temperature, dissolve the activator in pure water to prepare an activator solution, and mix it with the product A in proportion according to the ratio of product A: activator mass ratio of 1:4 to prepare Obtain product B, wherein activator is the mixture of potassium hydroxide and sodium hydroxide;

[0045] Take the product B obtained in the previous step and place it in an oven, dry it at 110°C for 6 hours, transfer it to a tube furnace, and raise the temperature to 915°C at a rate of 10°C / min under the protection of nitrogen or other inert gases , heat preservation and activation for 90min to obtain product C;

[0046] The product C...

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Abstract

The invention discloses a processing technology for increasing the specific surface area of ​​activated carbon through baking pretreatment, which comprises the following steps: 1) prebaking; 2) premixing; 3) activation; 4) washing. The invention prepares activated carbon by using enzymatic lignin as raw material to realize the added value utilization of enzymatic lignin, pre-baking lignin to make it dehydrate and condense, without adding chemical additives, and realizing lignin polymerization and phenolic substances The production of lignin increases the degree of polymerization of lignin, the specific surface area of ​​the activated carbon obtained after activation is significantly increased, the yield of activated carbon is increased, and the quality of activated carbon is improved, which is suitable for widespread promotion and use.

Description

technical field [0001] The invention relates to the field of activated carbon processing, in particular to a processing technology for increasing the specific surface area of ​​activated carbon through baking pretreatment. Background technique [0002] Activated carbon is a functional carbon material with well-developed pores and strong adsorption capacity. Activated carbon has stable physical and chemical properties, acid and alkali resistance, and heat resistance. Widely used, industrial activated carbon is prepared by carbonization and activation with coal, asphalt, biomass, etc. , renewable and environmentally friendly biomass raw materials are important substitutes. Lignin is the second most abundant natural raw material in nature. In industry, lignin generally comes from black liquor discharged from paper mills or leftovers from the production of bioethanol China currently produces more than 20 million tons of industrial lignin every year, but more than 98% of industr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/312C01B32/324C01B32/348
CPCC01B32/312C01B32/324C01B32/348
Inventor 马欢欢周建斌章一蒙陈登宇王恋
Owner NANJING FORESTRY UNIV
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