A process stream consisting of benzene vapor at 500oC  and 2 bar is to be cooled to 200oC by producing steam at 50 bar, using the two exchanger system shown in Figure Q1. Boiler feed water at 75oC  and 50 bar is first heated to saturation in exchanger 2. Saturated water is partially boiled in exchanger 1. The vapour liquid mixture from exchanger 1 is mixed with the saturated water from heat exchanger 2 and the phases are separated in the flash drum.                                              Figure Q1: Flow diagram for steam boiler loop Evaluate: the degrees of  freedom for each unit and                                                                    2.the  degrees of freedom for the whole  process  using the redundant  streams variables and redundant streams constraints that being eliminated.

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