Quote:
Originally Posted by GH85Carrera
Refineries make lots of products, and the bottom of the barrel is the black goo left behind. That gets refined into Carbon black that makes tires black, and is used in lots of products. How do we make tires without a ready supply of carbon black.
|
Modern refineries have delayed coker units that take vacuum resid (tar) and turn it into gas oil that can be turned into diesel and gasoline. The remainder is petroleum coke used in the smelting process.
Older or simple refineries that don't have coker plants have left-over resid (similar to coal tar) either from a vacuum or crude distillation process, depending on the plant complexity. That resid is typically sent to asphalt plants.
To make carbon black they take tar like described above and quick burn it in an O2 manipulated atmosphere.
It's basically soot from the incomplete combustion process.