The anthracene coking process has been investigated in the temperature range of 400-600 degrees C. It has been shown that intermolecular interaction of two anthracene molecules resulting in the elimination of hydrogen and the formation of a C-C bond between the middle rings begins at a temperature of 450 degrees C. Increasing the coking temperature to 500-600 degrees C leads to the formation of poorly crystallized graphite. In the case of pure anthracene, the formation of micron-sized spherical carbon particles occurs. The addition of carbon nanotubes to anthracene leads to the formation of the carbon coat covering their surface. The thickness of the carbon coat depends on the temperature of coking. An amorphous carbon layer observed on the surface of carbon nanotubes has a thickness of 1-2 nm in the case of coking temperature of 450 degrees C or 10-15 nm in the case of coking at 600 degrees C.