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US 4,726,894 AGranted
Distillation cut point control
AssigneeThe Foxboro Company
InventorCarroll J. Ryskamp
Life of this patent
Estimating the term…
Abstract
Cut point is controlled in a distillation process by monitoring the partial pressure in a stripper.
Claims8
In a process including a multidraw distillation main column and a side stripper column receiving a draw from said main column, the method of controlling the composition of a liquid product in a product removal line at the bottom of one said distillation column, said one column having an input line, a stripping vapor inlet line, a plurality of trays, and an overhead vapor removal line, distillation processes being carried out in said columns, said method comprising
- calculating the partial pressure of components vaporized from liquid at the bottom of said one column,
- monitoring the temperature of liquid at the bottom of said one column,
- calculating by standard calculation techniques the initial boiling point (IBP) of the liquid at the bottom of said one column using said partial pressure and temperature to obtain calculated composition,
- comparing said calculated composition with a set point composition, and
- adjusting said distillation process in said one column so as to approach said set point composition.
2 more elements
Dependencies are inferred from the claim text.