Internal heat integration – the key to an energy‐conserving distillation column

Abstract

This paper illustrates the thermal energy conservation potential of the so-called heat integrated distillation column (HIDiC), which combines advantages of direct vapour recompression and diabatic operation at half of the normal column height. In a typical close boiling mixture separation, compared with a column utilising the usual vapour recompression scheme, HIDiC halved the consumption of exergy at approximately the same capital cost, indicating a strikingly short pay-off time. The complexities of integrating the heat transfer equipment in the stripping section with proven gas/liquid contacting devices, which may work adversely to practical implementation of HIDiC concept, are also addressed.

Energy Conservation in Ethanol-Water Distillation Column with Vapour Recompression Heat Pump

“…The thermodynamic efficiency of a separation process is the ratio of the minimum amount of thermodynamic work required for separation to the minimum energy required for the separation (Olujic et al, 2003). For a vapour recompression distillation column, the energy required for separation process is composed of the reboiler heat load, Q reb , and the compressor power input,…”

Recent Advances in Internally Heat-Integrated Distillation Columns (HIDiC) for Sustainable Development

“…Especially, TU Del and eight partners had a large R and D project in the Netherlands from 2002 to 2005. ey showed the potential energy savings of HIDiC and reduction in CO 2 emission by comprehensive simulations (Olujic et al, 2003). Also, they developed a tray column type HIDiC and the column proved to have su cient mass and heat transfer e ciencies to achieve the desired energy saving performance by experiments .…”

Advanced exergy analysis of distillation tower and simulation and optimization by hysys

“…It is known that distillation is used for the separation of about 95% of all fluid separations in the chemical, industry, and that around 3% of the total energy consumption throughout the world is used in distillation units [7]. According to some recent estimates, about 40% of energy involved in refinery and other continuous chemical processes are consumed in distillation [21]. For this reason, the energy-efficient design and operation of distillation processes is an important issue discussed in various literatures [15], [9].…”