TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Process: A raw material pitch is added to the grain-shaped or powder-form pitch heat-processed material which is prepared previously as intermediate, and stirred in a reactor at 400-900 degrees Celsius.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Process: The pitch is obtained by polymerizing a substance containing condensed polycyclic hydrocarbon or condensed polycyclic hydrocarbon having at least one alkyl substituent, in the presence hydrogen fluoride and boron trifluoride. EXAMPLE - Dimethyl naphthalene (in moles) (129), hydrogen fluoride (75) and boron trifluoride (28) were reacted at 255 degrees Celsius for 4 hours. Nitrogen gas was blown to the reactor. The whole quantity of unreacted hydrogen fluoride and boron trifluoride were removed, to obtain dimethyl naphthalene pitch with yield of 51%. The obtained pitch had softening point of 255 degrees Celsius and micro crystal thickness of 12.3 nm. The obtained pitch was heat processed by raising temperature to 530 degrees Celsius at a rate of 5 degrees Celsius/minute under nitrogen atmosphere, and maintained at same temperature for 1 hour. The pitch was then cooled to room temperature and contents were ground to obtain heat-processed pitch material having mean particle diameter of 0.5 mm. The temperature of a portion of heat-processed material (200 g) was raised to 550 degrees Celsius under nitrogen stream and stirred continuously. Then, remaining pitch was added to above reaction material at a rate of 10 g/minute for 2 hours. The whole mixture was maintained at 550 degrees Celsius for 1 hour, and then cooled to obtain grain-shaped heat-processed material (280 g). The obtained grain-shaped material was returned and above process was repeated 5 times, to obtain granular-form heat-processed material having substitutional rate of 90% or more. Temperature of the granular material was further raised to 650 degrees Celsius at a rate of 5 degrees Celsius/minute, and maintained at same condition for 1 hour. The granular material was ground to particle having mean particle diameter of 13 mum, after cooling to room temperature. Potassium hydroxide mixed with alumina mortar was added to carbon powder, heated to 750 degrees Celsius, and maintained at the same condition for 2 hours. The reaction material obtained was filtered, water-washed and vacuum-dried at 150 degrees Celsius overnight, after cooling to room temperature, to obtain activated carbon. The obtained activated carbon had electrostatic capacitance of 45 F/g with favorable reproducibility.