A Novel Method for the Production of Anode Grade Coke from Petroleum Residues
Publication Date: 2012-May-08
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This paper describes a novel methodfor the productionof anode grade coke from delayed cokers through the processingof resin-rich streams that are obtained by solvent deasphaltingof vacuum bottoms that are high in sulfur and metal2Historically, delayed coking has been used mainly to increasethe yield of distillates and reduce the yield of residuum. Most of the petroleumcoke that is produced today is geared towards the productionof fuel grade coke. If the petroleum is low in sulfur and metals, it can be calcined to produce anode grade coke, for manufacturinganodes for aluminum electrolysis.
Economic incentive for calcining petroleum coke has always been driven by the relatively large price differentials that exist between fuel grade, anode grade and calcined coke. Despite the impact of the different geographic locations, we can state that, in general the price of the three categories of petroleumcoke has always fallen in the following price ranges:
Fuel Grade Coke Anode grade Coke Calcined Coke
A Novel Method for the Production of Anode Grade Coke from Petroleum
140 - 200
Uses of Petroleum Coke:
Fuel grade coke:whether sponge or shot coke, is used mainly in cement kilns and also in fluidized bed boilersfor generating steam and electricity, or blended with other solid fuels such as coal. In these boilers limestone is also added for sulfur removal. The important properties for fuel grade coke the cost per BTU, high HGI, and sulfur content. Vanadium in petroleum coke does not cause corrosion in boiler tubes as does vanadium in heavy fuel oil.
Gasification:Partial oxidation of petroleumcoke in a gasification process enables raw petroleum coke to be used in the production of steam, electricity,or gas feedstocks for the petrochemical industry.
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Figures4, 5,6 and 7 depict the schemes that constitute our novel method for the production of anode grade coke. These process configurations would result in upgrading resids that are high in sulfur and metals by solvent deasphalting the resid stream followed by feeding a resin-richstream to the delayed coking unit, for the produ ion of anode coke.
Residfeedstocks used for producing anode grade coke, have been historically limited to virgin residues with inherently low sulfur and metals content. In Figure 4, the residue is fed to the ROSE unit, where a deasphaltedoil, resin stream and an asphaltenestreams are produced. The resin stream is then fed directly to the delayed coker since it is low enough in sulfur and metals. The coke produced in this scheme meetsthe specifications required for anode grade.
C C s I ((1,ety K64 5 ~ Q J ~ P ' ~ O C ~ S /
For resids that are high in sulfur, the resin stream from the ROSE unit can be hydrotreated,as depicted in Fig. 5. In such a process configuration the coke produced from the delayed coker is low enough in sulfur and metals. Alternatively part of the resid s...