Maruzen Petrochemical Company, Limited

The Chiba Carbon Research Corporation

Minoru Yamamoto

Kiyoshige Hayashi

Mikio Nakaniwa

Nobuyuki Kobayashi

Yoshihiko Hase

Kazuo Ozaki

Arimasa Baba

A high-crystalline petroleum coke is produced from low-sulfur petroleum feedstock such as virgin crude oil, distillation residuum and cracked residium 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 1.0 .times. 10.sup.-6 /.degree. C over 100.degree.-400.degree. C.

Process for producing high-crystalline petroleum coke

A petroleum coke of unusually high-crystalline texture and of high purity is produced from a low-sulfur petroleum material by a process including a preheat-treating step for removing non-crystalline substances contained in the material as pitch or coke and a coking step wherein a heavy oil derived from the preceding step is coked in a coking crystallizer in such a manner that pitch-like heavy oil downwardly flows and is progressively accumulated and coked therein while gaseous light hydrocarbons are discharged at the upper part of crystallizer whereby the coking is conducted with a high growth and high orientation of coke crystals formed.

Process for the production of a petroleum coke and coking crystallizer

Any kind of virgin, low-sulfur crude oil is directly treated in a two-stage delayed coking process for yielding non-crystalline coke in the first stage and high-crystalline coke in the second stage, which process comprises preheating the crude oil in a tube heater to 460.degree. - 520.degree.C under 5-20 kg/cm.sup.2 G, maintaining the oil therein at that temperature for 30 - 500 seconds to allow the oil to be heat-soaked, subjecting the oil to first delayed coking under relatively mild conditions and subjecting the uncoked heavy residual oil to second delayed coking under relatively severe conditions.

Production of petroleum cokes

Growing community of inventors

Ichihara, Japan

Minoru Yamamoto