Method for the production of low ash activated charcoal
AssigneeVapo Oy
InventorsMika Timonen, Hannu Lamberg
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Abstract
The present invention discloses a method for the production of low ash activated charcoal from a carbon-containing raw material such as peat, in which method a damp mass of raw material is subjected to a hydrothermal carbonization process, in which the mass is heated to a temperature of 150 to 350 C and the process pressure increased to 10 to 40 bar, and the carbonized material obtained from the hydrothermal carbonization process is activated by heating it to a temperature above 400° C. The present invention further relates to the use of carbonized material obtained from the hydrothermal carbonization process for the production of activated charcoal.
Claims14
A method for the production of activated charcoal from peat, the method comprising:
- subjecting a mass of peat having a moisture content to a single- or multistage hydrothermal carbonization process, in which the mass of peat is heated to a temperature of 150 to 350° C. and the process pressure increased to 10 to 40 bar to produce a carbonized material;
- drying the carbonized material;
- and
- activating the carbonized material obtained from the drying step in order to increase the carbon content and porosity of the carbonized material, wherein the activating is done by heating said carbonized material to a temperature above 400° C. and by using steam, carbon dioxide or activation chemicals or a mixture thereof, and wherein the activating produces the activated charcoal.
Dependencies are inferred from the claim text.