METHOD FOR PRODUCING MESOPHASE PITCH Russian patent published in 2019 - IPC C10C1/16 C10C3/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to production of raw material for production of isotropic dense graphitized structural materials and can be used in oil refining industry. To obtain mesophase pitch, the raw material is heated and subsequently carbonized with raising temperature at a rate of not more than 20 °C per hour to temperature of carbonization and formation of mesophase. When this temperature is reached, conditions which stimulate growth of the number and size of mesophase particles are maintained. By raising the temperature, the formed mesophase matrix is fixed. As raw materials there are used asphaltenes obtained as a result of rectification heated from 300 to 320 °C from commercial heavy high-viscosity oil in vacuum column with top temperature of not less than 125 °C, bottom temperature of not less than 350 °C and an absolute top pressure of 8 kPa with subsequent deasphalting of the tar removed from the bottom of the column. Material is heated from carbonation beginning temperature of 530–550 °C to the temperature of completion of formation of mesophase 630–650 °C and fixation temperature of mesophases 780–800 °C at rate of 20 °C per hour. Pyrolysis of the feedstock is carried out in an inert atmosphere at pressure of 5 to 8 MPa to obtain mesocarbon microspheres, which are directed for further processing, and a loose coke residue, which is sent for demetallization.

EFFECT: obtaining anisotropic pitch with low content of sulfur and impurities.

1 cl, 1 tbl, 5 ex, 7 dwg