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Process Systems Engineering 

Prof. Davide Manca 

Dipartimento di Chimica, Materiali e Ingegneria Chimica “G. Natta” 

Politecnico di Milano 

Exercise #3 

Calculate  the  economic  potential  of  level‐2  related  to  the  process  conditions  used  in  previous  lessons considering the following costs of raw materials and products: 

Composition  Cost [€/kmol]

Benzene  12.5 

Toluene  8.8 

Hydrogen  2.1 

Biphenyl  7.4 

In the assessment of EP2, consider the value of heat of combustion of products i.e. 4€/MBtu. 

Composition  Hc [MBtu/kmol] 

Hydrogen  0.123 

Methane  0.383 

Benzene  1.41 

Toluene  1.68 

Biphenyl  2.688 

Consider 8000 working hours per year. 

Produce the following diagrams: 

 purge (splitting) ratio / EP2 imposing minimum selectivity of 0.96

 molar fraction of hydrogen in vent / EP2 imposing the minimum selectivity of 0.96

 conversion / EP2 as a function of the molar fraction of hydrogen in the vent

 temperature / EP2 as a function of the molar fraction of hydrogen in the vent

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