A kind of preparation method of activated carbon special for dioxin adsorption

Abstract

The invention discloses a preparation method of special active carbon for adsorbing dioxin. The method disclosed by the invention comprises the steps of pre-oxidizing and carbonizing phenol formaldehyde resin to obtain a carbon precursor; mixing the carbon precursor, petroleum coke, polyethylene glycol and potassium hydroxide, wherein the alkaline-to-carbon ratio is 1-6; heating to 750-820 DEG C at the temperature rise speed of 10-30 DEG C / min; activating for 0.5-1.0h; cooling and drying to obtain active carbon with a high specific surface area. The special active carbon can be used for efficiently removing dioxin, realizing high removal rate (more than 92%) of dioxin in a waste incineration process and ensuring that the concentration of dioxin in the dioxin removed smoke is less than 0.1ngTEQ / Nm<3>; the preparation method has the advantages of simplicity in preparation, few process steps and high yield.

Description

technical field

[0001] The invention belongs to a preparation method of activated carbon, in particular to a preparation method of special activated carbon for dioxin adsorption. Background technique

[0002] Garbage incineration treatment is an effective way to realize the recycling of garbage, and it is also very suitable for my country's national conditions of land shortage and energy shortage. However, its secondary pollution, especially dioxin pollution, has not been well resolved and has become the bottleneck of waste incineration in my country.

[0003] The research on the adsorption of dioxins has received continuous attention from researchers. Since the 1990s, activated carbon has been widely used in Europe and Japan to adsorb dioxins. This is due to the relatively strong interaction between activated carbon and dioxins. Yes, in addition to activated carbon, clay, zeolite, and gamma-type alumina can all be used to adsorb dioxins, but the effect is not as good as ac...

Examples

Embodiment Construction

[0011] Mix phenolic resin with potassium hydroxide, and potassium hydroxide accounts for 0.5% of the weight. Under 1% oxygen and 99% nitrogen, the temperature is raised to 180°C at a rate of 2°C / min, cooled to room temperature under nitrogen atmosphere, and then cooled to room temperature. Crushed with petroleum coke to less than 180μm to obtain powder. Mix it with polyethylene glycol and KOH evenly, petroleum coke accounts for 90% of the total weight, carbon precursor accounts for 8% of the total weight, polyethylene glycol accounts for 2% of the total weight, petroleum coke and potassium hydroxide alkali The carbon ratio is 5, the alkali-carbon mixture is heated to 800°C at a heating rate of 20°C / min under the protection of an inert atmosphere, activated for 0.5 hours, cooled to room temperature under an inert atmosphere, washed with water until neutral, and dried at 120°C After 12 hours, activated carbon was obtained.

[0012] According to the characterization, the activat...

technical field

[0001] The invention belongs to a preparation method of activated carbon, in particular to a preparation method of special activated carbon for dioxin adsorption. Background technique

[0002] Garbage incineration treatment is an effective way to realize the recycling of garbage, and it is also very suitable for my country's national conditions of land shortage and energy shortage. However, its secondary pollution, especially dioxin pollution, has not been well resolved and has become the bottleneck of waste incineration in my country.

[0003] The research on the adsorption of dioxins has received continuous attention from researchers. Since the 1990s, activated carbon has been widely used in Europe and Japan to adsorb dioxins. This is due to the relatively strong interaction between activated carbon and dioxins. Yes, in addition to activated carbon, clay, zeolite, and gamma-type alumina can all be used to adsorb dioxins, but the effect is not as good as ac...

Examples

Embodiment Construction

[0011] Mix phenolic resin with potassium hydroxide, and potassium hydroxide accounts for 0.5% of the weight. Under 1% oxygen and 99% nitrogen, the temperature is raised to 180°C at a rate of 2°C / min, cooled to room temperature under nitrogen atmosphere, and then cooled to room temperature. Crushed with petroleum coke to less than 180μm to obtain powder. Mix it with polyethylene glycol and KOH evenly, petroleum coke accounts for 90% of the total weight, carbon precursor accounts for 8% of the total weight, polyethylene glycol accounts for 2% of the total weight, petroleum coke and potassium hydroxide alkali The carbon ratio is 5, the alkali-carbon mixture is heated to 800°C at a heating rate of 20°C / min under the protection of an inert atmosphere, activated for 0.5 hours, cooled to room temperature under an inert atmosphere, washed with water until neutral, and dried at 120°C After 12 hours, activated carbon was obtained.

[0012] According to the characterization, the activat...