Patent ID: 11912941
Assignee: CARBON HOLDINGS INTELLECTUAL PROPERTIES, LLC
Field: Basic materials chemistry (Chemistry)
Classification: CPC C  B | IPC B  C

Claim 6:
7. A system for forming high carbon-containing coal tar pitch from raw coal, the system comprising:
a serially connected system including a slurry mix tank feeding a mechanically driven twin screw device configured to operate as a visco-mechanico preheater, wherein the slurry mix tank comprises a solvent extraction process configured to separate components of the raw coal by relative solubility of components of the raw coal to form an isotropic pitch and remove phenolic impurities, wherein the twin screw device comprises co-rotating screws, the co-rotating screws including catalyst metals that retain catalytic activity when sulfided, wherein an inlet and an outlet of the twin screw device comprise an inert gas environment; and
an extrusion die disposed at the outlet of the twin screw device, wherein an extruded pitch remains in the inert gas environment as the extruded pitch cools to at least below 200° C.