Patent ID: 8038976

Claim:
An activated carbon producing method comprising: a carbonizing step of thermally decomposing multi-layer film including a polyvinyl alcohol layer and cellulose acylate layers formed on surfaces of said polyvinyl alcohol layer in a heating furnace, to produce carbonized material; an activating step of activating said carbonized material with heat, to produce activated carbon by forming fine pores therein; a combustion step of combusting carboxylic acid contained in pyrolysis gas created by thermal decomposition in said heating furnace, to produce gaseous carbon dioxide; a first heat exchange step of exchanging heat between said pyrolysis gas from said combustion step and heat exchange medium, to provide said heating furnace with said heat of said heat exchange medium; and a gas washing step of absorbing said gaseous carbon dioxide contained in said pyrolysis gas from said first heat exchange step by use of alkaline absorption solution.