Unformatted text preview: m the 5 procedures are summarized as follows: Procedure D/100 moles of feed V/mole of D x of benzene in B 1 62.9 1.5 0.530 2 67.2 1.5 0.495 3 68.8 1.5 0.480 4 67.2 1.5 0.495 5 78.3 1.5 0.342 Analysis: Procedure 5: (continued) Exercise 7.11 (continued) (e) Procedure 5 is recommended because it produces by far the most distillate, which corresponds to the highest recovery of benzene. Exercise 7.12
Distillation of a mixture of benzene (A) and toluene (B) at 101 kPa. Given: Column consisting of a partial reboiler, one theoretical plate, and a total condenser. Produce a distillate of 75 mol% benzene from a saturated liquid feed of 50 mol% benzene. Assumptions: Constant molar overflow. Constant relative volatility = , = 2.5. Find: Number of moles of distillate per 100 moles of feed for: (a) Feed to the reboiler and no reflux. (b) Feed to the reboiler and a reflux ratio, L/D = 3. (c) Feed to the plate and a reflux ratio of 3. (d) Same as (c) except a partial condenser. (e) Feed to the rebo...
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