In some documents which introduce about UOP Sulfolane process, I see one or two internal reboilers in the recovery column. Internal reboiler make a significant increase in column diameter or height of column. it is difficult to repair and clean this type of reboiler. I don't know why they use internal reboiler in this situation. Who can help me give an explanation? Thanks you so much...
You can find UOP Sulfolane process in Handbook of petroleum refining processes (chapter 2.2)

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