In the beginning, the temperature increases until the reboiler mixture reaches its boiling temperature at t = 24 min. At this point in time, the feed is added. As the vapor rises inside the column, the temperatures of the product streams increase successively. TS2 first moves towards the temperature TB, but then quickly decreases at around t = 30 min. This decrease in temperature can be attributed to the previous introduction of the feed stream, whose lighter boiling components move to the side stream S2 and cause the temperature to drop. This also means that the feed stream needs a certain time until it reaches the lower part of the column.