Petroleum coke

Types 
There are four types of petroleum coke. They are: needle coke, honeycomb coke, sponge coke and shot coke. Different types of petroleum coke have different properties and microstructures.

Needle coke is a crystalline petroleum coke. It is also called acicular coke. It is used in making electrodes for the steel and aluminium industries. Needle coke is made only from either fluid catalytic cracking (FCC) decant oil or coal tar pitch.

Honeycomb coke is an intermediate coke. Compared to needle coke, honeycomb coke has a lower coefficient of thermal expansion and a lower electrical conductivity.
 Composition 
The chemicals inside petroleum coke depends on the petroleum feed stock used. It is mainly always made of carbon. It is also sometimes made up of hydrogen, nitrogen, sulfur and so on.

References

Category:Carbon
Category:Petroleum