The isotropic coke used as filler in the production of structural graphite must have invariant characteristics—in particular, its microstructure. Complete elimination of anisotropic structural elements (of length >10 μm) in the coke structure is difficult. In the present work, a new approach is considered for reducing the content of regions with microstructure score >2 (according to State Standard GOST 26132) in coke: forced removal of distillates by inert-gas injection in the reaction mixture.

The characteristics of synthetic and industrial coal-tar pitch samples are investigated. The characteristics of the corresponding pitch cokes are compared. Three materials are considered: synthetic low-temperature pitch based on coal-tar distillate; and medium and high-temperature industrial coal-tar pitches from different Russian producers. The influence of the pitch composition on the properties of the pitch coke is determined.