Energy optimization for distillation system

Operation of distillation columns involves a trade-off between energy use and product recovery. The optimal trade-off determines targets for operating parameters. The operating parameters include reflux ratio, feed temperature, column temperature, reboiling duty, column pressure, and so on. The question is How to achieve the most economic operation of the column  

FIGURE 14.1. Debutanizer example energy optimization based on reflux ratio. (From White (2012), reprinted with permission by AIChE.) 

Source From White (2012), reprinted with permission by AIChE. 

2 Setting Operating Targets with Column Bottom Temperature 

---