Method for preparing high-performance activated carbon by one-step pyrolysis of biomass with low pressure in a tubular furnace

A tube furnace and biomass technology, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of good adsorption performance of products, not harsh process conditions, low equipment requirements, etc., and achieve low cost and high adsorption performance Good, the effect of no loss of equipment

Active Publication Date: 2018-12-18
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Technical problem to be solved: In order to solve the shortcomings of the existing activated carbon physical method production technology, such as the need for activators such as water vapor, carbon dioxide or high-temperature flue gas, high energy consumption, and low product yield, the invention provides a tube furnace A method for preparing high-performance activated carbon by low-pressure one-step pyrolysis of biomass. The preparation process does not require additional activators. The method is simple, the process conditions are not harsh, the product yield is high, the cost is low, the product has good adsorption performance, and the equipment requirements are low. It is suitable for industrial production

Method used

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  • Method for preparing high-performance activated carbon by one-step pyrolysis of biomass with low pressure in a tubular furnace
  • Method for preparing high-performance activated carbon by one-step pyrolysis of biomass with low pressure in a tubular furnace
  • Method for preparing high-performance activated carbon by one-step pyrolysis of biomass with low pressure in a tubular furnace

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Raw material crushing: crush the air-dried walnut shell raw material, sieve, take 1.00-1.18mm particles, and dry at 120°C.

[0025] (2) Vacuum treatment before reaction: Put the corundum boat containing 9g of walnut shell raw materials into the middle of the tube furnace, close the valve at the inlet of the tube furnace, evacuate the inside of the tube to vacuum (<1Kpa) through the outlet valve, and close the outlet valve , Observe the pressure in the furnace through the pressure gauge at the entrance.

[0026] (3) Pyrolysis activation: heat up to a pyrolysis temperature of 900°C at a heating rate of 5°C / min. During the heating process, when the pressure in the furnace reaches 0.12MPa, adjust the outlet valve to control the pressure in the furnace to always be at 0.12Mpa, and keep warm for 6h After the pyrolysis is over, take out the sample, wash it with water until neutral, and dry it to become the activated carbon sample. The yield of activated carbon is 24.2%, a...

Embodiment 2

[0028] (1) Raw material crushing: crush the air-dried coconut shell raw material, sieve, take 1.00-1.18mm particles, and dry at 120°C.

[0029] (2) Vacuum treatment before reaction: Put the corundum boat with 9g coconut shell raw material into the middle of the tube furnace, close the valve at the inlet of the tube furnace, pump the inside of the tube to vacuum (<1Kpa) through the outlet valve, and close the outlet valve , Observe the pressure in the furnace through the pressure gauge at the entrance.

[0030] (3) Pyrolysis activation: heat up to a pyrolysis temperature of 900°C at a heating rate of 5°C / min. During the heating process, when the pressure in the furnace reaches 0.12MPa, adjust the outlet valve to control the pressure in the furnace to always be at 0.12Mpa, and keep warm for 6h After the pyrolysis is over, take out the sample, wash it with water until neutral, and dry it to become the activated carbon sample. The yield of activated carbon is 19.3%, and the speci...

Embodiment 3

[0032] (1) Raw material crushing: crush the air-dried coconut shell raw material, sieve, take 1.00-1.18mm particles, and dry at 120°C.

[0033] (2) Vacuum treatment before reaction: Put the corundum boat with 9g coconut shell raw material into the middle of the tube furnace, close the valve at the inlet of the tube furnace, pump the inside of the tube to vacuum (<1Kpa) through the outlet valve, and close the outlet valve , Observe the pressure in the furnace through the pressure gauge at the entrance.

[0034] (3) Pyrolysis activation: heat up to a pyrolysis temperature of 900°C at a heating rate of 5°C / min. During the heating process, when the pressure in the furnace reaches 0.1MPa, adjust the outlet valve to control the pressure in the furnace to always be at 0.1Mpa, and keep warm for 6h After the pyrolysis is over, take out the sample, wash it with water until neutral, and dry it to become the activated carbon sample. The yield of activated carbon is 20.2%, the adsorption ...

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Abstract

The invention provides a method for preparing high-performance activated carbon by one-step pyrolysis of biomass with low pressure in a tubular furnace. The method for preparing high-performance activated carbon by one-step pyrolysis of biomass with low pressure in a tubular furnace comprises: placing the biomass raw material in the middle of the tubular furnace; closing an inlet valve of the tubular furnace; pumping the tubular furnace to vacuum; sealing the outlet valve; then raising the temperature to 850-1,000 DEG C for pyrolysis for 4-7 hours, wherein the pressure in the tubular furnace is controlled to 0.1 to 0.14 MPa during the pyrolysis self-activation process; and washing the product with water, drying, to obtain an activated carbon product. According to the invention, the biomassactivated carbon can be prepared by one-step pyrolysis and activation of biomass with low pressure, without using activators such as phosphoric acid, potassium hydroxide, water vapor and carbon dioxide; the prepared product has a good adsorption performance and a high yield; and the preparing process is clean and environmentally friendly, the equipment requirements are low and the process is simple.

Description

technical field [0001] The invention relates to the field of activated carbon materials prepared from biomass, in particular to a method for preparing high-performance activated carbon by low-pressure one-step pyrolysis of biomass in a tube furnace. The preparation process is clean and pollution-free, the process is simple, the equipment requirements are low, and the product has excellent adsorption performance. Background technique [0002] As a carbonaceous adsorption material with developed pore structure, large specific surface area and strong selective adsorption, activated carbon has been widely used in the refining and purification process of military industry, food, metallurgy, chemical industry, environmental protection, medicine and other industries. With the strengthening of environmental protection, the improvement of food safety standards and the rise of power batteries in recent years, the demand for activated carbon is increasing, and it has become an indispens...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/324C01B32/336
CPCC01B32/324C01B32/336
Inventor 孙昊孙康蒋剑春王傲卢辛成许伟
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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