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Lecture_25_for_web

# Lecture_25_for_web - Monday Professors Paul Steen Jeff...

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Monday Professors Paul Steen & Jeff Varner will come to class to tell you about their group’s research.

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A gas stream containing 60 wt % ethane and 40 wt% butane is heated from 150 to 250 K at constant pressure = 5 bar. Assume this mixture behaves like and ideal gas. What is the rate of heat required? ethane T = 150 K, P = 5 bar T = 250 K, P = 5 bar V 0.00171 m 3 /kg 0.1288 m 3 /kg H 314.3 kJ/kg 973.3 kJ/kg butane T = 150 K, P = 5 bar T = 250 K, P = 5 bar V 0.00139 m 3 /kg 0.00160 m 3 /kg H H = 30.0 kJ/kg 237.0 kJ/kg From: Perry’s table 2-255 for ethane 2-240 for butane For an ideal gas or ideal solutions = i i mix H x H ˆ ˆ Real gases do not follow this rule because of differences arising from enthalpy of mixing or enthalpy of solution.