Can the energy cost of distillation be understood in this way?
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Is my understanding of the energy consumption of a single simple distillation multiplied by the multiple of the reflux ratio correct?
wrong! During process simulation, the heat load at the bottom of the tower will be calculated, as will the condenser load at the top of the tower. You also need to add the energy consumption of pumping the cooling medium. This calculation is accurate.
If variable costs are calculated, all energy consumption should be included, such as the bottom reboiler steam consumption rate.* Cost/product output = unit steam energy consumption, the cooling water consumption rate at the top of the tower is the same, and the water and electricity used in the distillation tower must be included.
Wrong, 1. The energy consumption of the pump must be added. 2. The reflux temperature is not necessarily the same as the feed temperature, so multiplying the reflux multiple is not correct. 3. The heat dissipation energy consumption of the reflux system is also different.