At our FCC Fractionator, the overhead temperature runs at about 270F. This overhead stream eventually gets condensed and fractionated into dry gas, LPG, and naphtha. The ASTM 3710 (Sim Dist) end point of the heaviest naphtha is about 440F. Question is why would the naphtha that have a 440F EP would boil overhead in the Fractionator at 270F? What am I missing? Thanks.
Eng-Tips is the largest engineering community on the Internet
Intelligent Work Forums for Engineering Professionals
-
Congratulations waross on being selected by the Tek-Tips community for having the most helpful posts in the forums last week. Way to Go!
FCC Fractionator OVHD Temp vs Naphtha End Point
- Thread starter dwwgsl
- Start date
EmmanuelTop
Chemical
Hi dwwgsl,
The presence of steam reduces the partial pressure of hydrocarbons and heavier fractions are carried overhead. Secondly, there is no real tower in the field that can fractionate perfectly between adjacent fractions (components). That is why you will always find lower boiling fractions in your first side-cut, LCO, instead of having them in the overhead products.
The presence of steam reduces the partial pressure of hydrocarbons and heavier fractions are carried overhead. Secondly, there is no real tower in the field that can fractionate perfectly between adjacent fractions (components). That is why you will always find lower boiling fractions in your first side-cut, LCO, instead of having them in the overhead products.
- Status
Similar threads
- Locked
- Question
- Locked
- Question