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PASSMCQpage 19holdUNREVIEWED
type=MCQ · page=19–20 · marks=2 · content_conf=0.7999999999999999 · math_conf=0.83

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file: GATE CH 2020 (with Solutions).pdf
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Consider the equilibrium data for methanol-water system at 1 bar given in the figure below.
11
0.9 x,(0.5,0.78) id0.8 u
qiq i
nl0.7 i
lol o
an0.6 h
tet e
m0.5 of(0.14,0.5) on0.4 i
tcrt c r
fa0.3 e
lol o
m0.2
0.100.1 0
00.10.20.30.40.50.60.70.80.91 mole fraction of methanol in liquid, x A distillation column operating at 1.0 bar is required to produce 92 mol % methanol. The feed is a saturated liquid. It is an equimolar mixture of methanol and water. The minimum reflux ratio is

Options

  1. A.
    0.33
  2. B.
    0.50
  3. C.
    0.54
  4. D.
    1.17

Answer

B

Solution

Saturate liquid q =1
10.10.
x.92)
,0.d,0.d
qui98(0.5,0.78)(0.92,0/7 i nl0.
ion0.ion_0.
thal6/5(0.14,0.5) e
m0.fn0.m_0.fn_0.
ctioo4/3 r fa0.
eoeo
l2/1 m0.
0.00.0
00.10.20.30.40.50.60.70.80.91 mole fraction of methanol in liquid, x
..
Rₘ=0.5 Hence, the correct options is (B).

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