?A stream of hydrocarbon gas at 500°C is cooled by continuously combining it with a

Chapter 7, Problem 7.57

(choose chapter or problem)

A stream of hydrocarbon gas at 500°C is cooled by continuously combining it with a stream of light oil in an adiabatic tower. The light oil enters as a liquid at 25°C; the combined stream leaves as a gas at 200°C.

(a) Draw a carefully labeled flow diagram for the process.

(b) Let F and D denote respectively the molar flow rates of hot hydrocarbon gas and light oil. Use data given below to determine a numerical value for the oil-to-gas ratio D/F. Explain your analysis.

(c) What is the advantage to quenching the hydrocarbon gas with a liquid rather than with another (cooler) gas? Explain.

Data: \(C_{P}^{v} (ave) = 150 J \cdot mol^{−1} \cdot K^{−1}\) for the hydrocarbon gas.

\(C_{P}^{v} (ave) = 200 J \cdot mol^{−1} \cdot K^{−1}\) for the oil vapor.

ΔHlv (oil) = \(35,000 J \cdot mol^{−1}\) at 25°C.

Text Transcription:

C_P^v (ave) = 150 J cdot mol^−1 cdot K^−1

C_P^v (ave) = 200 J cdot mol^−1 cdot K^−1

35,000 J cdot mol^−1

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