synthesis of Gasoline by Bergius process

The low ash coal is finely powdered and made into a paste with heavy oil and then a catalyst is incorporated .
Heated with hydrogen at 450 degree Celsius ,pressure 200-250 atm. for about 1.5 hours

2nH₂ + nC--------- C_nH_2n-- --Cracking----Low boiling liquids hydrocarbons

The gases led to condenser ,crude oil is obtained, which is then fractionated  to get Gasoline, Middle oil and heavy oil.