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ENGR5003 / Week 6
ENGR266 2019 Q A3Past paperOld spec ENGR2662:212 marks14 min

ENGR266 Summer 2019 Q A3[PARTIAL] Left out: Parts (c)-(d) (13 marks: excess Gibbs energy and vapour composition from the Margules equations, and the meaning of activity coefficients) are left out: Margules equations, excess Gibbs energy and activity coefficients are not in the current slides or formula sheets (CHECK in the audit).

Answer ALL parts (a) - (d)

Formulas you may need
  • Lever rule on a T-x-y diagram: liquid fraction LF=y1−z1y1−x1\dfrac{L}{F} = \dfrac{y_1 - z_1}{y_1 - x_1}, vapour fraction VF=z1−x1y1−x1\dfrac{V}{F} = \dfrac{z_1 - x_1}{y_1 - x_1} (from the component balance z1=(L/F)x1+(V/F)y1z_1 = (L/F)x_1 + (V/F)y_1) (learn this)
  • Phase rule (binary, two phases at fixed P: one degree of freedom, so T fixes x1x_1 and y1y_1): P+F=C+2P + F = C + 2 (on the formula sheet)
  1. (a)
    Plot the following vapour liquid equilibrium data for acetonitrile(1)/1-butanol(2) on the graph paper provided and label the liquid, vapour and liquid-vapour region. Also label the bubble curve and the dew curve. Table A3-1 vapour liquid equilibrium data for acetonitrile(1)/1-butanol(2).
    Temperature /Kx1x_1y1y_1
    390.8500
    379.250.080.394
    370.150.20.619
    361.650.5640.791
    357.250.780.889
    354.7511
    [8]
  2. (b)
    What is the liquid fraction present in the acetonitrile(1)/1-butanol(2) system at a 1-butanol fraction of 0.5 at 370 K?
    [4]