University of Tehran

Applying the heat integration in order to environmental pollutants minimization in distillation columns

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Pinch technology indicates the possibility of heat recovery in the process in a way that, through this method, heat exchange of hot streams that should become cold and cold streams that should become hot are possible. The pinch design method and heat integration technology developed earlier followed several rules and guidelines to allow design for minimum utility (or maximum energy recovery) in the minimum number of units. Occasionally, it appears not to be possible to create the appropriate matches because one or other of the design criteria cannot be satisfied. Heat integration is more than just pinch technology and heat exchanger networks. Today, it has for wider scope and touches every area of process design (Smith, 2005). The dominant heating and cooling duties associated with a distillation column are the reboiler and condenser duties. In general, how ever, There will be other duties associated with heating and cooling of feed and product streams. These sensible heat duties usually will be small in comparison with the latent heat changes in reboilers and condensers. There are two possible ways in which the column can be heat integrated with the rest of the process. The reboilers and condensers can be integrated either across, or not across the heat recovery pinch (Linnhoff, et al., 1983; Umeda, et al.,1979).

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