consequently, there is a large steam demand from the reboiler. There is also room for recovery of a significant quantity of medium grade heat; the condenser requires 310 te/hr of water in order to remove 25189kW of heat to condense the tops product, if it is assumed that the condenser is supplied with cold water at 20°C then 310 te/hr of water will be available at 90°C. This water will not be contaminated during the condensing process thus a sensible use for this water would be as boiler feed, if the water was treated before entering the condenser it could then be fed straight to the boiler. The use of treated water in the condenser (shell side) will also help prolong periods between planned maintenance operations due to reduced fouling (scale formation).