146:(Image 3), also known as furnaces, may be used as a distillation column reboiler. A pump is required to circulate the column bottoms through the heat transfer tubes in the furnace's convection and radiant sections. The heat source for the fired heater reboiler may be either fuel gas or fuel oil.
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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.
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separating the tube bundle from the reboiler section where the residual reboiled liquid (called the bottoms product) is withdrawn, so that the tube bundle is kept covered with liquid and reduce the amount of low-boiling compounds in the bottoms product.
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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
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by contact with high temperature heat transfer tube walls. High liquid recirculation rates are used to reduce tube wall temperatures, thereby reducing polymerization on the tube and associated fouling.
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to deliver the liquid into the reboiler. In this reboiler type, steam flows through the tube bundle and exits as condensate. The liquid from the bottom of the tower, commonly called the
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to circulate the column bottoms liquid through the reboilers. This is useful if the reboiler must be located far from the column, or if the bottoms product is extremely viscous.
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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
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The most critical element of reboiler design is the selection of the proper type of reboiler for a specific service. Most reboilers are of the
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reboilers (Image 2) do not require pumping of the column bottoms liquid into the reboiler. Natural circulation is obtained by using the
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Kettle reboilers (Image 1) are very simple and reliable. they are similar to shell and tube type heat exchangers. They may require
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Heat exchangers typically used to provide heat to the bottom of industrial distillation columns
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type and normally steam is used as the heat source in such reboilers. However, other
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Image 4: Typical steam-heated forced circulation reboiler for distillation towers
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of the column bottoms liquid into the kettle, or there may be sufficient
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Image 1: Typical steam-heated kettle reboiler for distillation towers
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Some fluids are temperature sensitive such as those subject to
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typically used to provide heat to the bottom of industrial
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usually provides the heat required for the vaporization.
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like hot oil or
Dowtherm (TM) may be used. Fuel-fired
255:Sketches and discussion of various reboiler types
109:Image 2: Typical horizontal thermosyphon reboiler
69:Commonly used heat exchanger type reboilers are:
162:A forced circulation reboiler (Image 4) uses a
222:Perry, Robert H. & Green, Don W. (1984).
66:may also be used as reboilers in some cases.
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225:Perry's Chemical Engineers' Handbook
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228:(6th ed.). McGraw-Hill.
207:(1st ed.). McGraw-Hill.
56:shell and tube heat exchanger
158:Forced circulation reboilers
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38:at the top of the column.
201:Kister, Henry Z. (1992).
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116:Thermosyphon reboilers
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81:Kettle Type reboilers
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280:Industrial equipment
60:heat transfer fluids
204:Distillation Design
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50:Types of reboilers
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250:Column reboilers
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270:Heat exchangers
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195:Further reading
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91:liquid head
264:Categories
130:calandrias
32:separation
36:condenser
20:Reboilers
178:See also
64:furnaces
189:Boiling
125:density
95:bottoms
87:pumping
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44:Steam
230:ISBN
209:ISBN
164:pump
99:weir
22:are
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