METHOD FOR PRODUCTION OF ACTIVATED CARBON Russian patent published in 2023 - IPC C01B32/324 C10B53/00 

FIELD: chemistry.

SUBSTANCE: invention relates to the industrial processing of combustible carbon- and hydrocarbon-containing products. A method for the production of activated carbon includes heating of rubber products waste, wood waste, and textile industry waste, crushed to a size of 20-30 mm. Convective drying of waste is carried out with flue gases in a pipeline in a direct flow mode during pneumatic transportation, waste is finally dried in a convective dryer at a flue gas temperature of 305-350°C. Raw materials from the convective drying stage are sent to a pyrolysis chamber, and from the activation stage – to the first stage of cooling of activated carbon with screw conveyors 2-3 m long, located at an angle to a horizontal of 45-60°. Conductive pyrolysis of raw materials is carried out by combustion of separated combustible gases from the pyrolysis and activation stage at 500-600°C. Combustion of separated combustible gases from the pyrolysis and activation stage is carried out by supply to a gas collector located in a lower section of a jacket under the pyrolysis chamber. A heat exchanger for creating superheated steam is located in an upper section of the jacket and is made of a spiral casing encircling the pyrolysis chamber and a branch pipe located inside the casing. Flue gases from combustion of separated combustible gases are discharged through the spiral casing of the heat exchanger. Superheated steam from the branch pipe of the heat exchanger is sent to a carbon activation chamber. To activate carbon, water vapor is used from the first stage of carbon cooling, heated with flue gases in the heat exchanger to create superheated steam. Activation of carbon is carried out at a temperature of 900-950°C. Activated carbon is cooled at the first stage to a temperature of 90-100°C by irrigation of 15÷20% of the total volume of activated carbon with water separated from pyrolysis gases and activation gases and preheated in the heat exchanger with flue gases, followed by cooling of carbon due to convection with the resulting water vapor. Carbon cooling at the second stage is carried out by lowering pressure in the chamber to 3-6 kPa. Pyrolysis gases and combustible activation gases are combined and ejected with cooled slurry to separate into slurry, water, and separated combustible gases. Flue gases from the convective dryer are sequentially purified in an electric filter, a bag filter, absorbed with water, and released into the atmosphere.

EFFECT: invention allows for obtainment of activated carbon from polluting rubber products waste together with wood waste and from textile industry waste.

1 cl, 1 dwg, 1 tbl, 3 ex