Page 168 - Analysis, Synthesis and Design of Chemical Processes, Third Edition

The results of the calculations for parts a, b, and c are provided in Table E6.2, which shows stream
conditions and utility requirements. To keep the calculations simple, the pressure drops across and
between equipment have been ignored.

Table E6.2 Flow Summary Table for Example 6.2 and Figure E6.2

Part d: Alternative -A- requires a compressor exit temperature of 595°C, which is a condition of special
concern. Note also that although the intermediate temperature of the gas (stream) in Alternative -B- was
374°C, because this stream is to be cooled there are no concerns about utility requirements.

Example 6.2 showed three alternatives of differing complexity for achieving the same final conditions.
The amount of work (w) and cooling utilities (q) required for each alternative were calculated. Based
solely upon process complexity, Alternative -A- is the most desirable. However, this alternative has