A processing technology for improving the quality of activated carbon through sulfuric acid pretreatment
A processing technology, activated carbon technology, applied in the direction of carbon compounds, inorganic chemistry, chemical instruments and methods, etc., can solve the problems of impaired activated carbon quality, reduced activated carbon yield, low activation temperature, etc., to improve quality and inhibit phenolic substances The effect of generation and specific surface area improvement
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Embodiment 1
[0039] Fully mix lignin with 5% sulfuric acid solution, the mass ratio of lignin to sulfuric acid solution is 1:1, place in a tube furnace, heat up to 180°C at a heating rate of 5°C / min, and keep at this temperature 30min, obtained product A;
[0040] Take the product A obtained in the previous step and add an activator 30% phosphoric acid solution to fully infiltrate and mix evenly, the product A:activator mass ratio is 1:1, and the product B is obtained;
[0041] The product B obtained in the previous step was placed in a tube furnace, and under the protection of nitrogen or other inert gases, the temperature was raised to 525 ° C at a heating rate of 2 ° C / min, and the product C was obtained by keeping it warm for 30 minutes;
[0042] The product C obtained in the previous step was cooled to room temperature under the protection of nitrogen, washed with deionized water until neutral, and finally dried in an oven at 100°C for 3 hours to prepare activated carbon.
Embodiment 2
[0044] Fully mix lignin with 12% sulfuric acid solution, the mass ratio of lignin to sulfuric acid solution is 1:1, place in a tube furnace, heat up to 190°C at a heating rate of 12°C / min, and keep at this temperature 75min, obtained product A;
[0045] Take the product A obtained in the previous step and add the activator 45% phosphoric acid solution to fully infiltrate and mix evenly, the product A:activator mass ratio is 2:5, and the product B is obtained;
[0046] Take the product B obtained in the previous step and place it in a tube furnace, under the protection of nitrogen or other inert gas, raise the temperature to 550°C at a heating rate of 6°C / min, keep it warm and activate for 60min, and obtain product C;
[0047]The product C obtained in the previous step was cooled to room temperature under the protection of nitrogen, washed with deionized water until neutral, and finally dried in an oven at 105°C for 4 hours to prepare activated carbon.
Embodiment 3
[0049] Fully mix lignin with 20% sulfuric acid solution, the mass ratio of lignin to sulfuric acid solution is 1:1, place in a tube furnace, heat up to 200°C at a heating rate of 20°C / min, and keep at this temperature 120min, obtained product A;
[0050] Take the product A obtained in the previous step and add the activator 60% phosphoric acid solution to fully infiltrate and mix evenly, the product A:activator mass ratio is 1:4, and the product B is obtained;
[0051] The product B obtained in the previous step was placed in a tube furnace, and under the protection of nitrogen or other inert gases, the temperature was raised to 575°C at a heating rate of 10°C / min, and the product C was obtained by keeping it warm for 90 minutes;
[0052] The product C obtained in the previous step was cooled to room temperature under the protection of nitrogen, washed with deionized water until neutral, and finally dried in an oven at 110°C for 5 hours to prepare activated carbon.
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Abstract
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