**Answers to problems with an asterisk are at the back of the book.*

**D1.** For the first trial of Example 6-1 determine the component matrix for n-pentane and then use the Thomas algorithm to find the n-pentane liquid flow rates leaving each stage. Compare your n-pentane flow rates with the values reported in Example 6-1.

**D2.** We are separating a mixture of ethane, propane, n-butane and n-pentane in a distillation column operating at 5.0 atm. The column has a total condenser and a partial reboiler. The feed flow rate is 1000 kmol/h. The feed is a saturated liquid. Feed is 8.0 mol% ethane, 33.0 mol% propane, 49.0 mol% n-butane and 10.0 mol% n-pentane. The column has 4 equilibrium stages plus the partial reboiler, which is an equilibrium ...

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