Abstract
The economics of heat pump assisted distillation of three alcohol mixtures, namely methanol-water, ethanol-water and methanol-ethanol, have been analysed and compared using the economic model outlined in Part 1. The results suggest that, at typical conditions for each system, the system with the smaller column temperature lift is the most economically attractive when payback period (PBP) is the main economic criterion. For typical conditions considered (PBP) values are 2 yr for the methanol-ethanol system, 2.6 yr for the ethanol-water system and 5 yr for the methanol-water system. For acceptable economic conditions, Rankine heat pump effectiveness factor (HPE) R of the system should be at least 0.5, and the running time should be more than 5000 h yr −1. The reflux ration has little influence on the economics of the heat pump assisted distillation system.
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