A kind of preparation method of vocs high adsorption rate and low desorption residual granular activated carbon
A granular activated carbon and high-adsorption technology, which is applied in separation methods, chemical instruments and methods, and dispersed particle separation, can solve the problems of large desorption residue, high production cost, and small specific surface area, and achieve the effect of not being easy to overheat and burn
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[0032] A method for preparing VOCs high adsorption rate and low desorption residual granular activated carbon, comprising the following steps:
[0033] The first step is to remove impurities and dry the husks: air-select the husks to remove impurities, wash and remove ash, and dry;
[0034] The second step, high-pressure impregnation: prepare the chemical agent into a solution of a certain concentration, mix it with the fruit shell, place it in a high-pressure stainless steel container, and immerse it under a certain pressure for 8 to 24 hours, take it out, and dry it. It is phosphoric acid or zinc chloride, the mass concentration is 10-60%, the mass ratio of fruit shell and chemical agent is 1: (1-6), the pressure is 0.5MPa-2MPa, and the drying temperature is 120°C;
[0035] Step 3: Activation: put the above-mentioned dried mixture in the activation reactor, heat up to the final activation temperature at a certain heating rate under a nitrogen atmosphere, and keep it warm for...
Embodiment 1
[0045] The first step is raw material preparation: the coconut shells are air-selected to remove impurities, washed to remove ash, and dried.
[0046] The second step, high-pressure impregnation treatment: prepare phosphoric acid into a solution with a mass concentration of 10%, mix it with the above-mentioned coconut shell according to the mass ratio of raw materials and phosphoric acid at 1:1, and place it in a high-pressure stainless steel container under a pressure of 0.5MPa Immerse for 24 hours, take it out, and dry it at 120°C.
[0047] The third step, activation: put the above-mentioned dried mixture in the activation reactor, raise the temperature to the activation temperature of 300 °C at 1 °C / min under nitrogen atmosphere, keep it warm for 0.5 h, and the nitrogen flow rate is 1 L / min. After activation, cool, wash and dry.
[0048] The fourth step, high-temperature modulation: put the above-mentioned activated carbon sample into a tube furnace, raise the temperature ...
Embodiment 2
[0050] The first step is raw material preparation: the coconut shells are air-selected to remove impurities, washed to remove ash, and dried.
[0051] The second step, high-pressure impregnation treatment: prepare phosphoric acid into a solution with a mass concentration of 60%, mix it with the above-mentioned coconut shell according to the mass ratio of raw materials and phosphoric acid at 1:6, place it in a high-pressure stainless steel container, and pass in superheated steam. Immerse at a pressure of 1MPa for 0.5 hours. After decompression, pressurize to 1MPa with steam, and then cycle and impregnate under pressure for 8 hours. Take it out and dry it at 120°C.
[0052] The third step, activation: put the above-mentioned dried mixture into the activation reactor, raise the temperature to the activation temperature of 800 °C at 10 °C / min under nitrogen atmosphere, keep it warm for 5 hours, and the nitrogen flow rate is 1 L / min. After activation, cool, wash and dry.
[0053]...
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