Is the bottom temperature of the depropanization column the same as the extraction temperature at the column bottom? Is there a problem with the reboiler?
Thread Content
The alkylation unit’s pretreatment depropanization tower has been showing poor light-end removal performance recently. It was observed that the temperature at the bottom of the tower is now equal to the temperature of the liquid drawn from the bottom of the tower; could there be a problem with the reboiler?
Send a flowchart for process analysis.
Check whether the feed rate is too high, exceeding the processing capacity of the depropanization tower. Check whether the propane content in the components of the feed is too high.
Check the valves inside the tower to see if they are clogged; propane may have condensed again.