Distillation: apparatus – Apparatus – Systems
Patent
1982-09-27
1985-09-03
Bascomb, Wilbur
Distillation: apparatus
Apparatus
Systems
202159, 202160, 202161, 202206, 203 1, 203 2, 203 19, 203 22, 203 23, 203 26, 203 81, 203DIG13, B01D 342, B01D 128
Patent
active
045390762
ABSTRACT:
A vapor compression distillation system for distillation of any two-component liquid mixture where separation of the more volatile from the less volatile component is required. This system achieves a very high efficiency through the use of vapor compression in conjunction with three heat exchangers: a reboiler which condenses the hot vapors compressed by a vapor pump and uses the heat given up by the condensing vapor to boil bottoms liquid to produce vapor within the stripper, a distillate heat exchanger which recovers heat from the distillate stream, and a bottoms heat exchanger which recovers heat from the outgoing bottoms effluent. This particular component configuration and process results in an exceptionally stable and reliable operation requiring the continuous control of only one parameter, reboiler temperature, while fixing all other process variables. Reboiler temperature is controlled by the use of a heating element which is controlled to give a continuously variable output to assist in preserving stable equilibrium. This close control of the reboiler temperature results in precise control of the operating pressure within the system. This distillation system has several additional features which help its overall energy efficiency and operational stability, including a disengagement section between the reboiler and the stripper, a float chamber to maintain backpressure on the high pressure side of the system, a standpipe assembly for maintaining a liquid filled condition in the bottoms heat exchanger while providing continuous flow for best heat recovery, an optional system for recovery of vapor pump lubricating oil to allow reuse and to prevent fouling of the reboiler heat exchange tubes, and an optional system for cooling the vapor pump by injecting liquid distillate into the pump outlet.
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Bascomb Wilbur
Hoelter Michael L.
Phillips C. A.
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