Page 397 - Analysis, Synthesis and Design of Chemical Processes, Third Edition
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It is also observed that the distillate D is not very pure. This is because of the layout of the residue
3
curves. Therefore, another feature of the residue curves map is that it suggests when concentration of a
component is possible and when it is not possible to achieve a high-purity product.
In summary, the BVDM or residue curve plots can be used to conceptualize feasible distillation
sequences. It is particularly useful for azeotropic systems involving three components, either when there
are three components in the feed or when an entrainer is added to break a binary azeotrope. This method
has only been introduced in this section, so care must be taken when applying this method without
additional reading. Reference [17] is suggested for further reading.
12.4 Reactor Feed Preparation and Separator Feed Preparation Sections
The purpose of these sections is to match the temperature and pressure desired on the inlet streams to the
reactor section and to the separation section. If the reactor operates at high temperature (a common
occurrence because this increases reaction rate), the reactor feed preparation and separator feed
preparation sections are often combined in a single process-process heat exchanger. Such heat integration
can be built into the base-case flowsheet, but, if not, it should be caught during the heat-integration step of
