Chapter 4, Problem 4.20P

A 100 kmol/h stream that is 97 mole% carbon tetrachloride (CCI4) and 3% carbon disulfide (CS₂) is to be recovered from the bottom of a distillation column. The feed to the column is 16mole% CS₂ and 84% CCU. and 2% of the CCI4 entering the column is contained in the overhead stream leaving the top of the column.

1. Draw and label a flowchart of the process and do the dcgrcc-of-frccdom analysis.

Calculate the mass and mole fractions of CCI4 in the overhead stream, and determine the molar flow rates of CC1₄ and CS₂ in the overhead and feed streams.

Suppose the overhead stream is analyzed and the mole fraction of CS₂ is found to be significantly lower than the value calculated in Part (b). List as many reasons as you can for the discrepancy, including possible violations of assumptions made in Part (b).