page_title: Reboiler
section_title: Thermosyphon reboilers
hierarchical_section_title: Reboiler / Types of reboilers / Thermosyphon reboilers
caption_attribution_description: English: I drew this diagram of a fired reboiler, in use on an industrial distillation tower, using Microsoft's Paint program. I am User:mbeychok and the date is November 20, 2006. This image has also been uploaded into the English Wikipedia.
context_page_description: Reboilers are heat exchangers typically used to provide heat to the bottom of industrial distillation columns. They boil the liquid from the bottom of a distillation column to generate vapors which are returned to the column to drive the distillation separation. The heat supplied to the column by the reboiler at the bottom of the column is removed by the condenser at the top of the column.
  Proper reboiler operation is vital to effective distillation. In a typical classical distillation column, all the vapor driving the separation comes from the reboiler. The reboiler receives a liquid stream from the column bottom and may partially or completely vaporize that stream. Steam usually provides the heat required for the vaporization.
context_section_description: Thermosyphon reboilers (Image 2) do not require pumping of the column bottoms liquid into the reboiler. Natural circulation is obtained by using the density difference between the reboiler inlet column bottoms liquid and the reboiler outlet liquid-vapor mixture to provide sufficient liquid head to deliver the tower bottoms into the reboiler. Thermosyphon reboilers (also known as calandrias) are more complex than kettle reboilers and require more attention from the plant operators. There are many types of thermosyphon reboilers including vertical, horizontal, once-through or recirculating.
caption: Image 3: A forced recirculating fired heater reboiler
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