Shot Coke



Shot coke is a by-product of the delayed coking process, and can represent a significant part of the petroleum coke produced. It is comprised in general of two basic types, namely regular shot coke and clustered or agglomerated coke. Shot coke is, however, of little or no commercial value, particularly if it has a high sulphur content, as is becoming increasingly the case in most oil refineries. Upgrading the coke and reducing its sulphur content would add considerably to its economic value both as a fuel and/or for making aluminium anodes. Towards this end, samples of Syrian shot coke, produced by the delayed coking unit at the Homs Oil Refinery, were thermally treated at high temperatures and increased residence time. A coke of higher quality was thereby obtained, with reduced sulphur content (1%) and higher real density (1.9 g/cm3). The observed weight loss was minimal, and the decrease in the calorific value was less than the average expected for other types of petroleum coke.

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    ABSTRACT: The true density of petroleum coke is a factor of its structure and properties. As the removal of volatile matter and sulphur from the coke is accompanied by significant changes in its structure and microporosity, changes in its density are to be expected. In this paper, the effects of the removal of volatile matter and sulphur on the true density of petroleum coke were investigated. The density was found to increase significantly with the evaporation of the volatile matter as a result of the thermal treatment of the coke at a temperature of 1200 K. Removal of part of the sulphur in the coke led also to a significant increase in the value of its true density. Temperatures greater than 1600 K were necessary for effective sulphur removal.
    Periodica Polytechnica Chemical Engineering 01/2005; 49(1):19-24. · 0.30 Impact Factor


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May 22, 2014