The plate where feed is administered is called feed plate. In feed plate, the liquid rate or vapor rate or both may change depending upon thermal condition of feed.
Cold feed: the entire feed stream adds to the liquid flowing down the column. In addition, some vapor condenses to heat the feed to boiling point. This makes the liquid flow even greater in stripping section and decrease flow of vapor in rectifying section. V < V̅ and L̅ > L +F. Read more