Petroleum coke is a carbonaceous product obtained in the oil refining process. To obtain it, Repsol uses delayed coking technology. This is a thermal cracking process which turns the heaviest fraction of oil into coke and other high value-added products.
The coke marketed by Repsol is called Green Fuel Grade Petcoke; it is known in Spain as coque verde combustible. 70% of petroleum coke production worldwide is used as fuel and the rest is used as a carbon source in the aluminum and steel industries.
Its high calorific value and competitive price make Repsol Green Fuel Grade Petcoke a major energy force in the ceramic, cement and electric industries and an attractive alternative to other fuels.
The internal specifications of Repsol's green fuel grade petcoke, based on the types of crude currently being processed in its refineries, are as follows:
- Ash: 0.6% maximum weight.
- Volatiles: 15% maximum weight.
- Sulfur: 7% maximum weight.
- HGI: 40/90 minimum and maximum.
- PCS: 8,000 Kcal./Kg. minimum.
* Estimated values and limits established on dry basis.