Related Questions

On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in
A Greater degree of separation with a fixed number of trays
B Increased reboiler load
C Increased reflux ratio
D None of these
When the feed to a distillation column is a saturated liquid, slope of the feed line is
A Zero
B Unity
C Infinity
D None of these
What is the slope of the feed line, if the feed to a distillation column is a saturated liquid?
A 0
B ∞
C > 1
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed
A q > 1
B q
C q = 1
D q = 0
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will
A Increase
B Decrease
C Remains same
D Depend on saturated boiling point; may increase or decrease
For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will
A Increase
B Decrease
C Remain same
D Data insufficient, can't be predicted
A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state,
A Composition of vapors and that of liquid do not vary throughout the column
B Reboiler load and condenser load are minimum
C The top and bottom compositions are unchanged with and without total reflux
D The top and bottom compositions correspond to the maximum enrichment available
The slope of the feed line in distillation opeartion is given by (where, q = fraction of the feed stream that is liquid.)
A $$ - {\text{q}}$$
B $$ - \frac{{\text{q}}}{{1 - {\text{q}}}}$$
C $$ - \frac{{\text{q}}}{{{\text{q}} - 1}}$$
D None of these
Ponchon Savarit method is based on the use of enthalpy concentration diagram, which contains the bubble point curve (saturated liquid curve), dew point curve (saturated vapour curve) and equilibrium tie lines. As compared to McCabe-Thiele's method, this method
A Is more accurate in finding the number of equilibrium stages
B Accounts for the enthalpy changes in the process
C Facilitates direct calculation of heat load on reboiler & condenser from, the diagram used in this method
D All of the above
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because
A Temperature is less
B Total pressure is less
C Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
D Saturated steam is used for steam distillation

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