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    Chapter 8

    Chapter 8

    8.D1.Optimum feed for recycle stream is 8th stage, opt. feed stage for fresh feed is ninth stage. Need 9-7/8 ~ 10 stages − both below condenser.
    8.D2.

    1. Butanol product = 3743.45 and water product = 1256.55 kmol/h

    2. Column 1: Optimum feed is stage 3 below condenser, and need 3 stages + partial reboiler.

      Column 2: Need ~ 2/3 stage + partial reboiler.

    8.D8.Must convert wt frac to mole Frac, αwater-ether_in_ether_layer = 7.026 (L/D)min = 7.467, L/D = 11.2, Top stage is opt. feed and need ~4 3/5 equilibrium contacts.
    8.D10.

    1. T = 97.5°C

    2. nwater/norganic = 10.81

    8.E1.

    1. Column 1: Optimum feed is top stage. Need ~ 2-7/8 or 3 eq. contacts (includes P.R.).

      Column 2: Optimum feed is top stage. Need 1 stage + P.R.

    2. (L/V)2 = 2.63. There is a net flow from separator into column 2.


      

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