Of the processes proposed in Probs. 7.50 and 7.51, which would you recommend? Why?

Problem 7.50

Liquid benzene at 25°C and 1.2 bar is converted to vapor at 200°C and 5 bar in a twostep steady-flow process: compression by a pump to 5 bar, followed by vaporization in a counterflow heat exchanger. Determine the power requirement of the pump and the duty of the exchanger in kJ⋅mol⁻¹. Assume a pump efficiency of 70%, and treat benzene vapor as an ideal gas with constant C_P = 105 J⋅mol⁻¹⋅K⁻¹.

Problem 7.51

Liquid benzene at 25°C and 1.2 bar is converted to vapor at 200°C and 5 bar in  a two-step steady-flow process: vaporization in a counterflow heat exchanger at  1.2 bar, followed by compression as a gas to 5 bar. Determine the duty of the  exchanger and the power requirement of the compressor in kJ⋅mol⁻¹. Assume a  compressor efficiency of 75%, and treat benzene vapor as an ideal gas with constant  C_P = 105 J⋅mol⁻¹⋅K⁻¹.