4 replies to this topic

[Piyush Kaushal]

Respected All,

 

I am into process consulting and as a result monitor an ethlyene cracker unit. In the de-ethanizer (DC2) unit i experience a decrease in coloumn overhead C3s with increase in coloumn bottom temperature (control tray temperature). I am unable to comprhend this phenomena. Kindly help

[shan]

Overhead C3s mass flow increase or mole fraction increase?

[ColinR33]

Is the column refluxed? Has the reflux flow/temperature changed? Has the tower operating pressure changed? We need more info for something like this in order to properly understand the system and offer suggestions. A PFD with the process variable before and after the temperature increase would be a great help.

[Bobby Strain]

If you don't have a process simulator like HYSYS, you should get one of the free distillation programs. Then you can understand the phenomena.

 

Bobby

[RockDock]

It sounds like the reflux has increased, too. While a higher reboiler temperature would vaporize more C3, the condenser is what ultimately controls the C3 in the C2 product.