Patent ID: 6640161
Filing Date: 2003-10-28
Classification: B01D

Abstract:
A method for operating a steam stripped fractionation column with the aid of a digital computer comprising:(a) measuring and providing the total moles of hydrocarbon passing overhead in the steam stripped fractionation column to the computer; (b) measuring and providing the total moles of water as steam passing overhead in the stream stripped fractionation column to the computer; (c) constantly determining the mole fraction of water as steam passing overhead in the steam stripped fractionation column; (d) measuring and providing the overhead pressure of the steam stripped fractionation column to the computer; (e) constantly determining the partial pressure of water by calculating the product of the mole fraction of water and the steam stripped fractionation column overhead pressure; (f) providing the computer with a database for the thermodynamic properties of water; (g) constantly determining the dew point temperature of the steam passing overhead in the steam stripped fractionation column; (h) measuring and providing the top temperature of the steam stripped fractionation column; and (i) rendering an alarm when the calculated difference between the dew point temperature determined in step (g) and the top temperature of the steam stripped fractionation column in step (h) is less than a predetermined value.