Practice Problems_Exam 2

Practice Problems_Exam 2 - 1. The feed to a flash...

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1. The feed to a flash evaporator consists of an equimolar mixture of n-heptane and of an unidentified hydrocarbon, designated as HC. The total feed flow rate is 100.0 kmol/h. Two streams emerge from the flash evaporator, one vapor and one liquid. The two streams are in equilibrium with each other at the operating pressure, which is atmospheric. Raoult’s law, applied to both n-heptane and HC, may be invoked to describe this equilibrium. The evaporator is designed to recover 90% of n-heptane in the liquid stream. The vapor stream contains 20.0 mole% n-heptane. a) Prepare a complete, labeled flowchart of this process. The flow rate of the water vapor stream exiting the evaporator is kmol/h. The flow rate of the liquid stream exiting the evaporator is kmol/h. The mole fraction of HC in the liquid stream exiting the evaporator is moles/mole. The temperature of the vapor and liquid streams exiting the evaporator is o C. The vapor pressure of HC at the temperature of the exit streams is
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Practice Problems_Exam 2 - 1. The feed to a flash...

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