PURPOSE: To provide a process for preparing low-sulfur and high-sulfur cokes which can efficiently obtain low-sulfur and low-sulfur cokes respectively from a heavy fraction and a light fraction by catalytically hydrogenating an untreated heavy fuel oil to lower the sulfur content, separating the product into a heavy fraction and a light fraction, subjecting each fraction to delay coking, and then conducting baking.

CONSTITUTION: In preparing a low-sulfur coke and a high-sulfur coke from a single starting material, an untreated heavy fuel oil 2, such as a still residue oil, is catalytically hydrogenated with hydrogen 6 in a hydrogenator 4 to lower the sulfur content of the product to not more than 0.75 wt.%, the hydrogenation product is separated by means of a fractionator 10 into a heavy fraction 42 and a light fraction 14, the light fraction and the heavy fraction are subjected to delay coking respectively in coke ovens 16, 44, and the resultant crude coke products are baked respectively in baking machines 24, 52. Thus, a low-sulfur baked coke 26 is obtd. from a coked light fraction, while a high-sulfur baked coke 54 is obtd. from a coked heavy fraction.