Conoco Inc.

Lloyd G Becraft

Bruce A Newman

Matthew C Sooter

Edward J Nanni

William H Kegler

A nonair-blown low sulfur petroleum residual oil is combined with super finely divided particles of calcined premium coke, and the combination is subjected to delayed coking to produce isotropic coke containing reduced sulfur and having a low CTE ratio.

Method for producing isotropic coke

A non air-blown low sulfur heavy aromatic mineral oil which does not produce acceptable isotropic coke when subjected to delayed coking is combined with an inorganic additive which promotes pyrolysis and which vaporizes during calcining and the combination is subjected to delayed coking to produce isotropic coke having a low CTE ratio. The isotropic coke is further processed (including calcination) to produce graphite logs used in nuclear reactors.

Process for producing isotropic coke

More uniform premium coke is obtained in a delayed coking process by oxygenating the latter portion of the premium coking feed introduced to the coking drum.

Production of uniform premium coke by oxygenation of a portion of the

Low sulfur isotropic coke is produced by the delayed coking of a mixture of a pyrolysis tar and a residual oil which has been solvent extracted to remove paraffinic components and then air-blown.

Manufacture of isotropic coke

Petroleum residual oil which has been contacted with an oxygen-containing gas to increase its softening point is combined with a pyrolysis tar and the combination is subjected to delayed coking to produce isotropic coke containing reduced sulfur and having a low CTE ratio.

A delayed coking process in which the overhead vapors from a delayed coking drum are separated into light hydrocarbon products and a gas oil, and in which the gas oil is hydrotreated after being separated from the light hydrocarbon products. The hydrotreated gas oil is then combined with coker feedstock and fed to the coking drum. The process produces a coke capable of producing a graphitized product having a lower longitudinal coefficient of thermal expansion than that of the coke product produced from the same feedstock by the same process but without the hydrotreating step.

Growing community of inventors

Ponca City, OK, United States of America

Lloyd G Becraft