Control of a fractional distillation process

Details Control of a fractional distillation process Control of a fractional distillation process

B - Operations, Transporting

01

D

202/55

B01D 3/42 (2006.01)

Patent

CA 1216544

Abstract of the Disclosure In a fractional distillation process in which it is desired to maintain a desired ASTM end point temperature of the overhead liquid product withdrawn from the fractional distillation process, changes in the heat removed by the fractional distillation process per unit of the feed are utilized to determine the equilibrium flash vaporization initial point and the equilibrium flash vaporization end point temperature for the overhead liquid product. The initial point temperature and end point temperature are then utilized to determine the actual slope of the equilibrium flash vaporization boiling point line. Changes in the slope of the equilibrium flash vaporization boiling point line are utilized to determine the actual slope of the ASTM boiling point curve at any particular time. The actual ASTM end point temperature for the overhead liquid product is derived based on the actual slope of the ASTM boiling point curve thus determined. The actual ASTM end point temperature is utilized to control the fractional distillation process so as to maintain a desired ASTM end point temperature for the overhead liquid product withdrawn from the fractional distillation process.

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