Rich oil temperature in benzene removal tower
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I’ve just started learning about coking. I saw that the temperature of the rich oil entering the debenzing tower is around 180 degrees. What is the theoretical basis for this temperature? Is there anyone who can explain this to me?
It can also be reduced; 140°C is fine as well. However, the amount of steam will increase, and accordingly the benzene-containing wastewater will also increase; therefore, raising the preheating temperature of the oil-rich mixture as much as possible helps to reduce the amount of steam required and improve the degree of benzene removal
Production involves two processes: separation and distillation. Crude benzene is mainly distilled at temperatures below 180°C; light benzene accounts for over 96% at 150°C and over 90% at 180°C, while higher temperatures result in solvent oil
Two conditions are required for benzene removal: temperature and a driving force during stripping. The optimal temperature is 180°C ± 5°C.
I would like to ask: if the temperature in the benzene removal tower is high, does that lead to an increase in the consumption of washing oil? And could this washing oil end up in the gas system?
Some comments: The concept is unclear; it’s not possible to distinguish between the benzene removal system and the benzene washing system