Conoco Inc.

Conocophillips Company

Bruce A Newman

Ta-Wei Fu

James R Roth

John K Shigley

Lloyd G Becraft

Lyndon D Boyer

Gary C Hughes

Bharat S Chahar

Lynn J Whitebay

Keith D Alexander

Ivan G McConkey

Bruce R Goddard

A method for reducing furnace fouling in a delayed coking process comprising (a) supplying at least one feed to a delayed coking unit comprised of coker furnace, at least two coke drums and a coker fractionator, (b) increasing the aromaticity of the feed to produce a modified stream by combining with the feed upstream of the coker furnace at least one added stream selected from the group consisting of an aromatic gas oil, a hydrotreated aromatic gas oil and combinations thereof, (c) introducing the modified feed stream into the coker furnace, d) heating the modified feed stream to a coking temperature in the coker furnace to produce a heated modified stream, and e) transferring the heated modified stream from the coker furnace to a coke drum.

Method for reducing fouling of coker furnaces

A delayed coking process for producing more uniform and higher quality coke by increasing the drum inlet temperature of the feedstock at least 2&#xb0; F. during a fill cycle.

Process for producing 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

The density and crush resistance of calcined coke are improved by depositing coker feedstock on green (uncalcined) coke, thereafter subjecting the coke to a heat soak and then calcining the coke.

Method for improving the density and crush resistance of coke

The coarse-grain CTE of premium coke is reduced by increasing the nominal velocity of the volatile coking by-products in the coking drum to a higher level than the preexisting nominal velocity.

Process for reducing the coarse-grain CTE of premium coke

A virgin heavy oil is hydrotreated, separated into a light fraction and a heavy fraction which are separately delay coked to obtain (a) a coke product of low sulfur content suitable for use as recarburizer coke or for use in the manufacture of graphite electrodes used in the manufacture of steel and (b) a coke product of higher sulfur content suitable for use in electrodes employed in the manufacture of aluminum.

Preparation of lower sulfur and higher sulfur cokes

Properties of premium coke are improved by coking the feed at a temperature lower than the normal coking temperature and thereafter subjecting the coke to a heat soak at substantially the same temperature as the temperature at which the coke was formed.

Method for improving the properties of premium coke

In a delayed premium coking process utilizing as feedstock an aromatic mineral oil having a high aromatic content and a low molecular weight, coke CTE is reduced and coke particle size is increased by sparging with a gas during the coking cycle.

Premium coking process

A process for providing more uniform premium coke in a delayed coking operation by adding an aliphatic petroleum fraction to the premium coking feed during the latter part of the coking cycle. Preferably the aliphatic petroleum fraction is added gradually and is increased in quantity over the period of addition.

In a delayed premium coking process the particle size of the premium coke is increased by the addition of a Lewis acid such as aluminum chloride to the coking process. Preferably the aluminum chloride is added during the latter part of the coking cycle.

A heavy high-sulfur hydrocarbonaceous feedstock is partially delayed coked and partially formcoked. The coke products are screened, with larger particles being calcined at desulfurizing temperatures and smaller particles being recycled to the formcoker. Overhead products from both coking operations are combined, fractionated, and desulfurized. The heaviest cut from the fractionator is combined with the feedstock as recycle.

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Ponca City, OK, United States of America

Bruce A Newman