Effect of feed on optimal thermodynamic performance of a distillation column

Exergetic and Economic Assessment of Distillation Hybrid Configurations for Bioethanol Refining

“…The duty of a utility with specific heat capacity (kJ/kg K) and temperature difference between its inlet and outlet was obtained from the energy balance equation as the product All costs and products value were subjected to profitability analysis using online spread sheet for chemical plant economic evaluation [27]. Equations used to evaluate profitability parameters are contained in plant design and economics for chemical engineers [25] and the spreadsheets for carrying out this analysis are available online [27]. Tables 3-6 show the energy and exergy analysis result for the six hybrid configurations selected in this work.…”

“…A look at the two most energy efficient hybrids (THEX1and THEX3), brought to the fore the possibility that distillation column may have high exergy loss but very high or low exergetic efficiency as pointed out ealier [25]. THEX3 has higher exergy loss and lower energy requirement than THEX1 yet the latter is exegetically more efficient.…”

Source composite curve for waste reduction

“…Pinch analysis has been fruitfully used in analyzing heat exchanger networks [3], utility systems [5,6], mass exchanger networks [7][8][9][10], water networks [11], distillation column [12][13][14][15][16], production planning [17,18], etc. Pinch analysis recognizes the importance of setting targets before design.…”

Retrofit of Distillation Columns Using Thermodynamic Analysis

“…On the other hand, a sharp change in the enthalpy represents inappropriate feed conditioning, such as feed quality or temperature. For example, a sharp change on the reboiler side may be due to a subcooled feed, and a feed preheater with a heat duty depending on the change can be installed (1,2,16,18). Feed conditioning is usually preferred to side condensing or reboiling, since the side heat exchangers are effective at suitable temperature levels or stages only (1,2,17,18).…”