If the gases leave the tower at 6 atm, 25°C, and are expanded to, say, 1.5 atm, calculate the turbine exit gas temperatures without preheat, and if the gases are preheated to 400°C with the reactor off-gas. Also, estimate the power recovered from the preheated gases.

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Consider the extraction of energy from the tail gases from a nitric acid adsorption tower. Gas composition, kmol/h: 0₂ N₂ NO NO₂ H₂O 371.5 10,014.7 21.9 Trace saturated at 25°C