HYSYS Operations Guide

2-22 Column Theory
Reboiled Absorber
A Reboiled Absorber column has a single inlet and two exit
streams. When used alone, the Reboiled Absorber has three
boundary streams and so requires three Pressure Flow
specifications; one pressure and two flow specifications. A
pressure specification is always required for the vapour product
leaving the column.
Figure 2.7
The column shows the
recommended
pressure flow
specifications for a
stand alone reboiled
absorber.
Distillation Column
The basic Distillation column has one inlet and two or three exit
streams, depending on the condenser configuration.When used
alone, the Distillation column has three or four boundary
streams but requires four or five pressure-flow specifications;
generally one pressure and three or four flow specifications. The
extra pressure-flow specification is required due to the reflux
stream, and is discussed in Section 2.7 - Column-Specific
Operations.
2-22