Composition of Coke
The table below illustrates the wide range of compositions for raw petroleum coke (referred to as green coke) produced in a delayed coker and the corresponding compositions after the green coke has been calcined at 2375 °F (1302 °C):
| Component | Green coke as produced |
Coke calcined at 2375 °F |
|---|---|---|
| Fixed carbon, wt % | 80 − 95 | 98.0 − 99.5 |
| Hydrogen, wt % | 3.0 − 4.5 | 0.1 |
| Nitrogen, wt % | 0.1 − 0.5 | |
| Sulfur, wt % | 0.2 − 6.0 | |
| Volatile matter, wt % | 5 − 15 | 0.2 − 0.8 |
| Moisture, wt % | 0.5 − 10 | 0.1 |
| Ash, wt % | 0.1 − 1.0 | 0.02 − 0.7 |
| Density, g/cc | 1.2 − 1.6 | 1.9 − 2.1 |
| Metals, ppm weight: | ||
| Aluminum | 15 − 100 | 15 − 100 |
| Boron | 0.1 − 15 | 0.1 − 15 |
| Calcium | 25 − 500 | 25 − 500 |
| Chromium | 5 − 50 | 5 − 50 |
| Cobalt | 10 − 60 | 10 − 60 |
| Iron | 50 − 5000 | 50 − 5000 |
| Manganese | 2 − 100 | 2 − 100 |
| Magnesium | 10 − 250 | 10 − 250 |
| Molybdenum | 10 − 20 | 10 − 20 |
| Nickel | 10 − 500 | 10 − 500 |
| Potassium | 20 − 50 | 20 − 50 |
| Silicon | 50 − 600 | 50 − 600 |
| Sodium | 40 − 70 | 40 − 70 |
| Titanium | 2 − 60 | 2 − 60 |
| Vanadium | 5 − 500 | 5 − 500 |
Read more about this topic: Delayed Coker
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