A flash drum at 700.0 kPa is separating binary mixtures of ethane and n-butane.

a. The following equilibrium results were generated using correct units in Eq. (2-28) and then converting temperature to C. Complete the table and use the results to answer the questions that follow.

Eq (2-28)

Use these equilibrium results to answer the following:

b. If the feed is Z_E = 0.200 mole fraction ethane, p = 700.0 kPa, and V/F can assume any value from 0 to 1.0, what are the highest and lowest possible ethane vapor mole fractions? What are the highest and lowest possible ethane liquid mole fractions? What are the highest and lowest temperatures of the flash drum?

c. If the feed is Z_E = 0.300 mole fraction ethane, p = 700.0 kPa, and V/F = 0.40, what are the outlet vapor and liquid mole fractions and the drum temperature?

d. If the feed is Z_E = 0.300 mole fraction ethane, p = 700.0 kPa, and XE =0.200, what value of V/F was used and what is the outlet vapor mole fraction ethane?

e. If the feed is Z_E = 0.180 mole fraction ethane, p = 700.0 kPa, and Tdrum 45.0C, what are the values of V/F, X_E, and Y_E?

Transcribed Image Text:

In K = a/T+ a2/T + 6 a2/T + a + a In p+ a2/p + a/p pl p3