3473-11 HW 4 - What is the heat exchanger duty(MMBtu/hr and...

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1 of 1 CHE 3473 Chemical Engineering Thermodynamics Fall 2011 Homework #4 Due: Wed, 9/21/2011 Three problems, 15 points total. 1) (3 pts) Methane is cooled from 350 to 120 °F. Ideal gas behavior can be assumed. Compare the predicted enthalpy change (Btu/lbmol) using the heat capacity correlations for methane in a) SVNA7, b) Perry’s 8 th edition, and c) Chemcad. Which is correct? 2) (6 pts) The benzene recovery column in the detergent manufacturing process (handout on first day of class) produces a saturated benzene vapor stream which is condensed and subcooled in heat exchanger H-2. For this problem, the process is operating at different conditions than shown in the class handout. The diagram below shows the revised operating conditions.
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Unformatted text preview: What is the heat exchanger duty (MMBtu/hr) and cooling water supply rate (gpm) for the service indicated? Generate your answer using methods and correlations provided in our text (don’t use Perry’s, Chemcad, or constant values for C p ). 3) (3 pts) A low pressure reactor feed stream consisting of 25 vol % hydrogen and 75 vol % nitrogen is preheated from 80 to 550 °F in a waste heat recovery unit. How much heat (MMBtu/hr) is transferred to the reactor feed stream when reactor feed rate is 15 MMSCFD? Use the heat capacity correlations in SVNA7 to generate your answer. Standard conditions are 60 °F and 14.696 psia. State any assumptions associated with your solution....
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