Patent ID: 8137530

Claim:
A process of producing petroleum coke comprising: coking a feedstock comprising a first heavy oil comprising 1 to 50 percent by mass and a second heavy oil comprising 50 to 99 percent by mass based on a total amount of the feedstock: wherein the first heavy oil has a sulfur content of 1.0 percent by mass or less, a nitrogen content of 0.5 percent by mass or less, an aromatic index of 0.1 to 0.21, a saturate content of 53 percent by mass or more and a total of an asphaltene content and a resin content of 10 percent by mass or less, and is produced by hydrodesulfurizing an atmospheric distillation residue or a vacuum distillation residue with a sulfur content of 1 percent by mass or more under conditions (1) where the total pressure is 10 MPa or greater and less than 16 MPa and the hydrogen partial pressure is 5 MPa or greater and 16 MPa or less or conditions (2) where the total pressure is 20 MPa or greater and 25 MPa or less and the hydrogen partial pressure is greater than 20 MPa and 25 MPa or less, and wherein the second heavy oil has an aromatic index of 0.4 to 0.9 and an initial boiling point of 150° C. or higher, and is produced by catalytic fluidized cracking a vacuum gas oil or a desulfurized vacuum gas oil.