Patent ID: 8715484

Claim:
A process for producing needle coke for a graphite electrode, the process comprising: (A) blending two or more stock oils to prepare a stock oil composition; (B) determining a 10 vol % distillation temperature of the stock oil composition; (C) separating the stock oil composition into an aromatic component and a non-aromatic component; (D) determining an aromatic component content with respect to the total weight of the stock oil composition, an aromatic component molecular weight, and a non-aromatic component normal paraffin content; (E) when the stock oil composition meets all of conditions i) to iv): i) the 10 vol % distillation temperature is 280° C. or higher; ii) the aromatic component content is 30-80 wt % with respect to the total weight of the stock oil composition; iii) the aromatic component molecular weight is 255-1300; iv) the non-aromatic component normal paraffin content is at least 5 parts by weight with respect to 100 parts by weight of the aromatic component; coking the stock oil composition with a delayed coker at 400-600° C. to obtain a coke, and calcining the coke at 1000-1500° C. to obtain needle coke; and (F) when the stock oil composition does not meet all of conditions i) to iv), adjusting the stock oil composition and performing (B), (C), (D), and (E) on the adjusted stock oil composition.