Process for producing high-crystalline petroleum coke

摘要

A high-crystalline petroleum coke is produced from low-sulfur petroleum feedstock such as virgin crude oil, distillation residuum and cracked residuum by subjecting the feedstock to preheat treatment under specific conditions to effect cracking and soaking thereof, subjecting the preheat-treated feedstock to flash distillation to remove non-crystalline substances contained therein as pitch and to recover distillate, fractionating the distillate to provide a heavy residue and subjecting the heavy residue to a delayed coking under specific conditions to produce the desired coke which has a coefficient of thermal expansion of less than 1.0x10-6/ DEG C. over 100 DEG -400 DEG C.