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Method for hydrothermally assisted production of lignin activated carbon with high specific surface area

A high specific surface area, hydrothermally assisted technology, applied in chemical instruments and methods, non-metallic elements, inorganic chemistry, etc., can solve the problems of high production cost, complex activation process, limited range of lignin value-added, etc., and achieve production cost. Low cost, simple process operation and significant economic benefits

Pending Publication Date: 2021-08-10
NANJING FORESTRY UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its activation process is complicated, the production time is long and chemical reagents are used many times, and the production cost is extremely high
[0003] In addition, in the paper industry, a large amount of lignin is discharged along with the waste liquid, causing waste of resources and polluting the environment. At the same time, most of the development of lignin is concentrated on the research of lignin adhesives, and the scope of lignin value-added is limited.

Method used

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  • Method for hydrothermally assisted production of lignin activated carbon with high specific surface area
  • Method for hydrothermally assisted production of lignin activated carbon with high specific surface area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The nickel ark containing 5 g of lignin was placed in a high-temperature tube furnace, and the temperature was raised from room temperature to 900 °C at a rate of 10 °C / min in a nitrogen atmosphere of 200 mL / min, and kept at this temperature for 80 min. The tube furnace was cooled to room temperature, the samples were taken out, washed with water until neutral, and then dried in an oven at 105 °C to constant weight. That is, lignin pyrolytic carbon (named AAC-1) is obtained. through figure 2 Nitrogen adsorption-desorption curve test (analyzed by Autosorb-iQ automatic gas adsorption analyzer, the same below), the specific surface area of ​​AAC-1 is 669.27 m 2 / g.

Embodiment 2

[0029] Put 5 g of lignin in a nickel ark, add 10 g of KOH and 10 mL of deionized water, and stir slowly until the mixture is uniform. Then, the nickel ark containing the mixture was placed in a high-temperature tube furnace, and the temperature was raised from room temperature to 900 °C at a rate of 10 °C / min in a nitrogen atmosphere of 200 mL / min, and kept at this temperature for 80 min. The tube furnace was cooled to room temperature, the samples were taken out, washed with acid and water until neutral, and then dried in an oven at 105 °C to constant weight. That is, a lignin activated carbon with a higher specific surface area (named AAC-2) is obtained. According to the nitrogen adsorption-desorption curve test, the specific surface area of ​​AAC-2 is 1643.93 m 2 / g.

Embodiment 3

[0031] Such as figure 1 As shown, 5 g of lignin and 60 mL of deionized water were placed in the reactor and mixed evenly, and then the reactor was placed in a muffle furnace at 100 °C for 2 hours. The reactor was cooled to room temperature, poured out the hydrothermally assisted treated mixture into a nickel ark and added 10 g KOH, and stirred slowly until the mixture was uniform. Then put the nickel ark containing the mixture (mixed evenly) in a high-temperature tube furnace, in a nitrogen atmosphere of 200 mL / min, from room temperature to 900 °C at a rate of 10 °C / min, and at this temperature Keep warm for 80 min. The tube furnace was cooled to room temperature, the samples were taken out, washed with acid and water until neutral, and then dried in an oven at 105 °C to constant weight. That is, lignin activated carbon with high specific surface area (named AAC-3) is obtained. According to the nitrogen adsorption-desorption curve test, the specific surface area of ​​AAC-3 ...

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Abstract

The invention discloses a method for hydrothermally assisted production of lignin activated carbon with a high specific surface area. The method comprises the steps of putting lignin and deionized water into a reaction kettle; placing the reaction kettle in a muffle furnace and keeping the temperature for a certain time; putting the hydrothermally assisted mixture into a nickel ark, adding a certain mass of KOH, and slowly stirring; placing the nickel ark containing the stirred mixture in a high-temperature tubular furnace to be activated for a certain time; and cooling, pickling and washing the activated product, and drying in a drying oven until the weight is constant, thereby obtaining the lignin activated carbon with high specific surface area. Compared with lignin pyrolytic carbon (without hydrothermal assistance and KOH), the specific surface area is remarkably increased, and the increase rate reaches 265.82-374.90%; and compared with lignin activated carbon (without hydrothermal assistance) activated by KOH, the specific surface area is also remarkably increased, and the increase rate reaches 48.93-93.34%. The process is simple to operate, low in production cost and remarkable in economic benefit.

Description

technical field [0001] The invention belongs to the field of activated carbon production, and in particular relates to a method for hydrothermally assisted production of lignin activated carbon with high specific surface area. Background technique [0002] Activated carbon with high specific surface area has developed pore structure and strong adsorption capacity. It is a kind of carbon material with excellent performance. It is widely used in military industry, fermentation, biopharmaceutical, synthetic chemical industry, environmental protection, electrode materials and other fields. However, the specific surface area (500-1200 m 2 / g) are generally lower. Therefore, activated carbon with high specific surface area has always been favored by people. In order to produce activated carbon with high specific surface area, multiple activators are often used for compound activation. However, the activation process is complicated, the production time is long and chemical reage...

Claims

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Application Information

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IPC IPC(8): C01B32/348C01B32/318
CPCC01B32/348C01B32/318
Inventor 周建斌王亮才陈登宇马欢欢冯鑫章一蒙周建明赵曼淇
Owner NANJING FORESTRY UNIV
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